Enhanced mTouch Capacitive Touch Evaluation Kit Users Guide

Enhanced mTouch™ Capacitive
Touch Evaluation Kit and
Accessory Boards
User’s Guide
© 2009-2012 Microchip Technology Inc.
DS41385F
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chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net,
dsPICworks, dsSPEAK, ECAN, ECONOMONITOR,
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Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB,
MPLINK, mTouch, Omniscient Code Generation, PICC,
PICC-18, PICDEM, PICDEM.net, PICkit, PICtail, REAL ICE,
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© 2009-2012, Microchip Technology Incorporated, Printed in
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ISBN: 978-1-62076-298-1
QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV == ISO/TS 16949 == DS41385F-page 2
Microchip received ISO/TS-16949:2009 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
© 2009-2012 Microchip Technology Inc.
ENHANCED mTouch™ CAPACITIVE
TOUCH EVALUATION KIT AND
ACCESSORY BOARDS USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 5
Chapter 1. Introduction
1.1 Overview ...................................................................................................... 13
1.2 Operational Requirements ........................................................................... 17
1.3 Initial Board Setup ........................................................................................ 17
Chapter 2. Demonstration Application
2.1 Introduction to the Touch Interface ............................................................... 19
2.2 Individual Touch Sense Demonstrations ...................................................... 21
Chapter 3. ProfiLab-Expert™ Graphical User Interface for Real-Time Debugging
3.1 Overview ...................................................................................................... 25
3.2 GUI Setup ..................................................................................................... 25
3.3 mTouch GUI screens ................................................................................... 36
Chapter 4. Evaluation Board Hardware
4.1 Application Functional Overview .................................................................. 43
4.2 Board Components ...................................................................................... 49
4.3 Interfacing to the Evaluation Boards ............................................................ 55
Chapter 5. Troubleshooting
5.1 Common Issues ........................................................................................... 57
Appendix A. Evaluation Board Schematics
Appendix B. Adding Features to a ProfiLab-Expert™ GUI
B.1 mTouch Application Support ........................................................................ 69
Index ............................................................................................................................. 73
Worldwide Sales and Service .................................................................................... 74
© 2009-2012 Microchip Technology Inc.
DS41385F-page 3
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
NOTES:
DS41385F-page 4
© 2009-2012 Microchip Technology Inc.
ENHANCED mTouch™ CAPACITIVE
TOUCH EVALUATION KIT AND
ACCESSORY BOARDS USER’S GUIDE
Preface
NOTICE TO CUSTOMERS
All documentation becomes dated, and this manual is no exception. Microchip tools and
documentation are constantly evolving to meet customer needs, so some actual dialogs
and/or tool descriptions may differ from those in this document. Please refer to our web site
(www.microchip.com) to obtain the latest documentation available.
Documents are identified with a “DS” number. This number is located on the bottom of each
page, in front of the page number. The numbering convention for the DS number is
“DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the
document.
For the most up-to-date information on development tools, see the MPLAB® IDE online help.
Select the Help menu, and then Topics to open a list of available online help files.
INTRODUCTION
This chapter contains general information that will be useful to know before you use an
Enhanced mTouch Capacitive Touch Evaluation Kit and Accessory Boards. Items
discussed in this chapter include:
•
•
•
•
•
•
•
•
Document Layout
Conventions Used in this Guide
Warranty Registration
Recommended Reading
The Microchip Web Site
Development Systems Customer Change Notification Service
Customer Support
Document Revision History
DOCUMENT LAYOUT
This document describes how to use the Enhanced mTouch Capacitive Touch
Evaluation Kit and Accessory Boards as a development and demonstration tool for
PIC16F, PIC18F, PIC24F, PIC24H, and PIC32 MCU device capabilities and features. The
document layout is as follows:
• Chapter 1. Introduction – This chapter introduces the Enhanced mTouch
Capacitive Touch Evaluation Kit and Accessory Boards and provides an overview of
their features.
• Chapter 2. Demonstration Application – This chapter describes the
preprogrammed capacitive touch sense demonstration application.
• Chapter 3. ProfiLab-Expert™ Graphical User Interface for Real-Time Debugging
– This chapter describes the diagnostic software and how to use it with the Enhanced
mTouch Capacitive Touch Evaluation Kit and Accessory Boards.
• Chapter 4. Evaluation Board Hardware – This chapter provides a functional
overview of the Enhanced mTouch Capacitive Touch Evaluation Kit and
Accessory Boards and identifies the major hardware components.
© 2009-2012 Microchip Technology Inc.
DS41385F-page 5
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
• Chapter 5. Troubleshooting – This chapter provides troubleshooting tips for
commonly encountered issues.
• Appendix A. “Evaluation Board Schematics” – This appendix provides
detailed schematic diagrams of the evaluation boards.
• Appendix B. “Adding Features to a ProfiLab-Expert™ GUI” – This appendix
provides for more information on ProfiLab-Expert and how to extend the GUI by
adding new features.
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
Represents
Examples
Referenced books
Emphasized text
A window
A dialog
A menu selection
A field name in a window or
dialog
A menu path
MPLAB® IDE User’s Guide
...is the only compiler...
the Output window
the Settings dialog
select Enable Programmer
“Save project before build”
A dialog button
A tab
A key on the keyboard
Click OK
Click the Power tab
Press <Enter>, <F1>
Italic Courier New
Sample source code
Filenames
File paths
Keywords
Command-line options
Bit values
Constants
A variable argument
Square brackets [ ]
Optional arguments
Curly brackets and pipe
character: { | }
Ellipses...
Choice of mutually exclusive
arguments; an OR selection
Replaces repeated text
#define START
autoexec.bat
c:\mcc18\h
_asm, _endasm, static
-Opa+, -Opa0, 1
0xFF, ‘A’
file.o, where file can be
any valid filename
mcc18 [options] file
[options]
errorlevel {0|1}
Initial caps
Quotes
Underlined, italic text with
right angle bracket
Bold characters
Text in angle brackets < >
Courier New font:
Plain Courier New
Represents code supplied by
user
DS41385F-page 6
File>Save
var_name [,
var_name...]
void main (void)
{ ...
}
© 2009-2012 Microchip Technology Inc.
Preface
WARRANTY REGISTRATION
Please complete the enclosed Warranty Registration Card and mail it promptly.
Sending in the Warranty Registration Card entitles you to receive new product updates.
Interim software releases are available at the Microchip web site.
RECOMMENDED READING
This user’s guide describes how to use the Enhanced mTouch Capacitive Touch Evaluation Kit and Accessory Boards. Other useful documents are listed below. The following Microchip documents are available and recommended as supplemental reference
resources. The latest documentation is available from the mTouch Sensing Solutions
web page (www.microchip.com/mtouch).
Readme Files
For the latest information on using other tools, read the tool-specific Readme files in
the Readme subdirectory of the MPLAB® IDE installation directory. The Readme files
contain update information and known issues that may not be included in this user’s
guide.
Family Reference Manual Sections
Family Reference Manual sections are available, which explain the operation of the
PIC® microcontroller family architecture and peripheral modules. The specifics of each
device family are discussed in the individual family’s device data sheet.
Users are specifically directed to the “Charge Time Measurement Unit (CTMU)”
Family Reference Manual sections for a detailed discussion of this module, which is at
the heart of the capacitive touch sense demonstration. Please refer to the Microchip
web site for the latest version of these documents.
Device Data Sheets and Flash Programming Specifications
Refer to the appropriate device data sheet for device-specific information and
specifications. Also, refer to the appropriate device Flash Programming Specification
for information on instruction sets and firmware development. These documents may
be obtained from the Microchip web site or your local sales office.
16-bit MCU and DSC Programmer’s Reference Manual (DS70157)
This manual is a software developer’s reference for the 16-bit PIC24F and PIC24H
MCU, and 16-bit dsPIC30F and dsPIC33F DSC families of devices. It describes the
instruction set in detail and also provides general information to assist in developing
software for these device families.
Note:
Refer to “MIPS32® Architecture for Programmers Volume II: The MIPS32®
Instruction Set” at www.mips.com for related information on PIC32 MCUs.
MPLAB® Assembler Linker and Utilities for PIC24 MCUs and dsPIC®
DSCs User’s Guide (DS51317)
This document details Microchip Technology’s language tools for dsPIC DSC devices
based on GNU technology. The language tools discussed are:
•
•
•
•
MPLAB Assembler PIC24 MCUs and dsPIC DSCs
MPLAB Linker PIC24 MCUs and dsPIC DSCs
MPLAB Archiver/Librarian PIC24 MCUs and dsPIC DSCs
Other utilities
© 2009-2012 Microchip Technology Inc.
DS41385F-page 7
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
MPLAB® Assembler Linker and Utilities for PIC32 MCUs User’s Guide
(DS51833)
This document details Microchip Technology’s language tools for PIC32 MCU devices
based on GNU technology. The language tools discussed are:
•
•
•
•
MPLAB Assembler PIC32 MCUs
MPLAB Linker PIC32 MCUs
MPLAB Archiver/Librarian PIC32 MCUs
Other utilities
HI-TECH C® for PIC10/12/16 User’s Guide (DS51865)
This document details the use of Microchip’s HI-TECH C Compiler for PIC10/12/16
MCUs, which is a free-standing, optimizing ANSI C compiler. It supports all PIC10,
PIC12 and PIC16 series devices, as well as the PIC14000 device and the enhanced
Mid-Range PIC® MCU architecture.
MPLAB® C Compiler for PIC18 MCUs User’s Guide (DS51288)
This document details the use of Microchip’s MPLAB C Compiler for PIC18 MCU
devices to develop an application. The MPLAB C Compiler is a GNU-based language
tool, based on source code from the Free Software Foundation (FSF). For more
information about the FSF, see www.fsf.org.
MPLAB® C Compiler for PIC24 MCUs and dsPIC® DSCs User’s Guide
(DS51284)
This document details the use of Microchip’s MPLAB C Compiler for PIC24 MCUs and
dsPIC DSC devices to develop an application. The MPLAB C Compiler is a
GNU-based language tool, based on source code from the Free Software Foundation
(FSF). For more information about the FSF, see www.fsf.org.
MPLAB® C Compiler for PIC32 MCUs User’s Guide (DS51686)
This document details the use of Microchip’s MPLAB C Compiler for PIC32 MCU
devices to develop an application. The MPLAB C Compiler is a GNU-based language
tool, based on source code from the Free Software Foundation (FSF). For more
information about the FSF, see www.fsf.org.
MPLAB® REAL ICE™ In-Circuit Emulator User’s Guide (DS51616)
This document describes how to use the MPLAB REAL ICE in-circuit emulator as a
development tool to emulate and debug firmware on a target board, as well as how to
program devices.
MPLAB® IDE User’s Guide (DS51519)
This document describes how to use the MPLAB IDE Integrated Development Environment, as well as the MPLAB project manager, MPLAB editor and MPLAB SIM simulator.
Use these development tools to help you develop and debug application code.
PICkit™ Serial Analyzer User’s Guide (DS51647)
This document details the PICkit™ Serial Analyzer development system, which enables
a personal computer (PC) to communicate with embedded development systems via
serial protocols such as I2C™, SPI, and asynchronous and synchronous USART. The
PC program uses a graphical interface to enter data and commands to communicate to
the target device. Data and commands can be entered using basic or scripting commands. The PICkit Serial Analyzer connects to the embedded development system
using a 6-pin header.
DS41385F-page 8
© 2009-2012 Microchip Technology Inc.
Preface
Application Notes
There are several Application Notes available from Microchip that help in
understanding capacitive touch applications. These include:
•
•
•
•
•
•
•
AN1101 “Introduction to Capacitive Sensing”
AN1102 “Layout and Physical Design Guidelines for Capacitive Sensing”
AN1250 “Microchip CTMU for Capacitive Touch Applications”
AN1298 “Capacitive Touch Using Only an ADC (“CVD”)”
AN1317 “mTouch™ Conducted Noise Immunity Techniques for the CTMU”
AN1325 “mTouch™ Metal Over Cap Technology”
AN1334 “Techniques for Robust Touch Sensing Design”
Microchip mTouch™ Sensing Solutions Webinars
Currently, there are three online Webinars available from the Microchip web site
(www.microchip.com/mtouch) for mTouch Sensing Solutions:
• Introduction to mTouch™ Capacitive Touch Sensing
• Capacitive mTouch™ Sensing Solutions: Design Guidelines
• Overview of Charge Time Measurement Unit (CTMU)
© 2009-2012 Microchip Technology Inc.
DS41385F-page 9
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
THE MICROCHIP WEB SITE
Microchip provides online support through our web site at www.microchip.com. This
web site is used as a means to make files and information easily available to
customers. Accessible by using your favorite Internet browser, the web site contains
the following information:
• Product Support – Data sheets and errata, application notes and sample
programs, design resources, user’s guides and hardware support documents,
latest software releases and archived software
• General Technical Support – Frequently Asked Questions (FAQs), technical
support requests, online discussion groups, Microchip consultant program
member listing
• Business of Microchip – Product selector and ordering guides, latest Microchip
press releases, listing of seminars and events, listings of Microchip sales offices,
distributors and factory representatives
DEVELOPMENT SYSTEMS CUSTOMER CHANGE NOTIFICATION SERVICE
Microchip’s customer notification service helps keep customers current on Microchip
products. Subscribers will receive e-mail notification whenever there are changes,
updates, revisions or errata related to a specified product family or development tool of
interest.
To register, access the Microchip web site at http://www.microchip.com, click
Customer Change Notification and follow the registration instructions.
The Development Systems product group categories are:
• Compilers – The latest information on Microchip C compilers and other language
tools. These include the MPLAB® C compiler; MPASM™ and MPLAB 16-bit
assemblers; MPLINK™ and MPLAB 16-bit object linkers; and MPLIB™ and
MPLAB 16-bit object librarians.
• Emulators – The latest information on the Microchip MPLAB REAL ICE™
in-circuit emulator.
• In-Circuit Debuggers – The latest information on the Microchip in-circuit
debugger, MPLAB ICD 3.
• MPLAB IDE – The latest information on Microchip MPLAB IDE, the Windows®
Integrated Development Environment for development systems tools. This list is
focused on the MPLAB IDE, MPLAB SIM simulator, MPLAB IDE Project Manager
and general editing and debugging features.
• Programmers – The latest information on Microchip programmers. These include
the MPLAB PM3 device programmer and the PICkit™ 3 development
programmers.
CUSTOMER SUPPORT
Users of Microchip products can receive assistance through several channels:
•
•
•
•
Distributor or Representative
Local Sales Office
Field Application Engineer (FAE)
Technical Support
Customers should contact their distributor, representative or FAE for support. Local
sales offices are also available to help customers. A listing of sales offices and
locations is included in the back of this document.
Technical support is available through our web site at: http://support.microchip.com
DS41385F-page 10
© 2009-2012 Microchip Technology Inc.
Preface
DOCUMENT REVISION HISTORY
Revision A (April 2009)
This is the initial released version of the document.
Revision B (September 2009)
•
•
•
•
Added reference to PIC18F MCU
Added PIC18F CTMU Evaluation Board Schematic
Added PIC18F Block Diagram for the CTMU Board
Modified the Kit Contents list
Revision C (June 2010)
This version of the document includes the following updates:
•
•
•
•
•
Added references to PIC24H and PIC32 MCUs throughout the document
Modified the Kit Contents list
Added the PIC32 CVD Touch Evaluation Board
Added block diagrams for the PIC24H CVD and PIC32 CVD Evaluation Boards
Updated PIC16F CSM/CVD Evaluation Board schematic and layout
Revision D (August 2011)
•
•
•
•
•
Removed references to CSM
Added references to new PIC16F CVD Evaluation Board
Replaced “CVD/CSM schematic” with “CVD schematic”
Updated all references to CVD/CSM, to CVD only
Changed document’s title to “Enhanced mTouch™ Capacitive Touch Evaluation
Kit User’s Guide”
Revision E (February 2012)
This revision of the document includes the following updates:
• The document title has been updated to “Enhanced mTouch™ Capacitive Touch
Evaluation Kit and Accessory Boards User’s Guide”
• Added the “PICkit™ Serial Analyzer User’s Guide” (DS51647) and AN1325
“mTouch™ Metal Over Cap Technology” to “Recommended Reading”
• Updated the Enhanced mTouch™ Capacitive Touch Evaluation Kit Contents (see
Figure 1-1)
• Updated Section 1.1.2.1 “PIC24H Capacitive Touch Evaluation Board”
• Added Section 1.1.2.2 “PIC32 CTMU Capacitive Touch Evaluation Board”
• Added Chapter 3. “ProfiLab-Expert™ Graphical User Interface for Real-Time
Debugging”
• Added Section 4.1.6 “PIC32 CTMU Evaluation Board”
• Updated the PIC16 CVD Evaluation Board Components (see Figure 4-7,
Table 4-1, and Section 4.2.1.1)
• Added Section 4.1.6 “PIC32 CTMU Evaluation Board”
• Added the PIC32 CTMU Evaluation Board to Section 4.2.2, Figure 4-8, Table 4-2,
and Section 4.2.2.1
• Added the PIC32 CTMU Evaluation Board schematic (see Figure A-6)
• Added Appendix B. “Adding Features to a ProfiLab-Expert™ GUI”
• Formatting updates and minor typographical changes have been incorporated
throughout the document
© 2009-2012 Microchip Technology Inc.
DS41385F-page 11
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
Revision F (May 2012)
This revision of the document includes the following updates:
• All references to VDDCORE were removed
• Minor updates to text and formatting were incorporated throughout the document
DS41385F-page 12
© 2009-2012 Microchip Technology Inc.
ENHANCED mTouch™ CAPACITIVE
TOUCH EVALUATION KIT AND
ACCESSORY BOARDS USER’S GUIDE
Chapter 1. Introduction
Thank you for purchasing a Microchip Technology Enhanced mTouch Capacitive Touch
Evaluation Kit and/or Accessory Board. Depending on your purchase, up to four
individual evaluation boards are provided. These evaluation boards are intended to
introduce and demonstrate the possibilities for capacitive touch sense applications on
the PIC16F, PIC18F, PIC24F, PIC24H, and PIC32 microcontroller platforms.
Note:
This evaluation kit (and the accessory boards) are intended as a functional
evaluation of Microchip’s mTouch™ Sensing Solutions. The kit and boards
have not been designed for use in noisy or production-level testing
environments. Please refer to the Microchip application notes listed in the
Recommended Reading section of the Preface for guidelines when
attempting to design a product to be used or deployed in such
environments.
This chapter introduces the evaluation kit and the separate accessory boards and
provides an overview of their features. Topics covered include:
• Overview
• Operational Requirements
• Initial Board Setup
1.1
OVERVIEW
The Enhanced mTouch Capacitive Touch Evaluation Kit and Accessory Boards provide
a simple platform for developing a variety of capacitive touch sense applications.
Depending on the kit or board purchased, up to four evaluation boards are included
with PIC16F, PIC18F, PIC24F, PIC24H, and PIC32 microcontrollers, with four sensor
daughter boards, as shown in Figure 1-1, Figure 1-2, and Figure 1-3.
These evaluation boards are intended to be used to develop a capacitive touch sense
application using Microchip’s mTouch Sensing Solution technologies. A board is used
by first connecting a sensor daughter board, and then supplying power to the board via
USB, a PICkit™ 3 In-Circuit Programmer/Debugger, or the PICkit Serial Analyzer. The
J3/J4 connector, with numbers from 0 to 15, is the connector for the sensor channels.
The numbers, from 0 to 13 for PIC16F, from 0 to 12 for PIC18F, and from 0 to 15 for
PIC24F, PIC24H, and PIC32, represent the microcontroller’s sensor channels.
When using an evaluation board out of the box, the default function of the LEDs is to
illuminate on a key press. All functionalities may be reprogrammed by using a
Microchip programmer and reprogramming the firmware in the device. The firmware
supplied with the evaluation board has been optimized for use with the four sensor
daughter boards. This firmware is also available for download from the Microchip web
site.
The USB connection supplies power to the board; no additional external power supply
is needed. For independent operation, the evaluation board may be disconnected from
the PC and powered at test points.
© 2009-2012 Microchip Technology Inc.
DS41385F-page 13
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
A separate, 6-wire programming interface on connector J1 allows users to replace the
preprogrammed demonstration firmware with their own applications using Microchip’s
MPLAB Integrated Development Environment (IDE) and In-Circuit Serial
Programming™ (ICSP™). This allows the board to also be used as a test platform for
capacitive touch sense applications.
Any of the in-circuit debugger/programmers listed in Section 1.2 “Operational
Requirements” can be used to debug the application from MPLAB. Real-time
diagnostic output on the J2 connector can be captured with the PICkit Serial Analyzer.
1.1.1
Enhanced mTouch Capacitive Touch Evaluation Kit Contents
The Enhanced mTouch Capacitive Touch Evaluation Kit (DM183026-2), shown in
Figure 1-1, contains the following items:
• Four evaluation boards:
- PIC16F CVD Evaluation Board
- PIC18F CTMU Evaluation Board
- PIC24F CTMU Evaluation Board
- PIC32 CVD Evaluation Board
• Four sensor daughter boards
- 2-Channel Slider Sensor Daughter Board
- 4-Channel Slider Sensor Daughter Board
- 8-Key Direct Sensor Daughter Board
- 12-Key Matrix Sensor Daughter Board
• PICkit Serial Analyzer
• Two accessory cables (not shown in Figure 1-1):
- PICkit Serial Analyzer to evaluation board J2 adaptor cable (future upgrade)
- USB cable
FIGURE 1-1:
DS41385F-page 14
ENHANCED mTouch™ CAPACITIVE TOUCH EVALUATION
KIT CONTENTS
© 2009-2012 Microchip Technology Inc.
Introduction
1.1.2
Additional Evaluation Boards
Two additional evaluation boards (PIC24H and PIC32 CTMU) are available for use with
the four sensor daughter boards, the PICkit Serial Analyzer, and the accessory cables
provided in the Enhanced mTouch Capacitive Touch Evaluation Kit. Both of these
boards are described in the following sections.
1.1.2.1
PIC24H CAPACITIVE TOUCH EVALUATION BOARD
The PIC24H Capacitive Touch Evaluation Board (AC243026) is designed to facilitate
the development of capacitive touch-based applications using PIC24H-series
microcontrollers. This board is intended to supplement the Enhanced mTouch
Capacitive Touch Evaluation Kit and uses the same sensor daughter boards listed in
Section 1.1.1 “Enhanced mTouch Capacitive Touch Evaluation Kit Contents”.
This evaluation board includes an onboard PICkit serial interface, an ICSP header, a
USB connector (for power only), and a 16-bit LED display. The 24-pin header (J3/J4)
connects to the sensor daughter boards that are included in the Enhanced mTouch
Capacitive Touch Evaluation Kit (sold separately, DM183026-2).
FIGURE 1-2:
© 2009-2012 Microchip Technology Inc.
PIC24H CAPACITIVE TOUCH EVALUATION BOARD
DS41385F-page 15
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
1.1.2.2
PIC32 CTMU CAPACITIVE TOUCH EVALUATION BOARD
The PIC32 CTMU Capacitive Touch Evaluation Board (AC323027) is designed to
facilitate the development of capacitive touch-based applications using PIC32-series
microcontrollers with a Charge Time Measurement Unit (CTMU) module. This board is
intended to supplement the Enhanced mTouch Capacitive Touch Evaluation Kit and
uses the same sensor daughter boards listed in Section 1.1.1 “Enhanced mTouch
Capacitive Touch Evaluation Kit Contents”.
This evaluation board includes an ICSP header, a USB connector (for power only), and
a 16-bit LED display. The 24-pin header (J3/J4) connects to the sensor daughter
boards that are included in the Enhanced mTouch Capacitive Touch Evaluation Kit
(sold separately, DM183026-2).
FIGURE 1-3:
DS41385F-page 16
PIC32 CTMU EVALUATION BOARD
© 2009-2012 Microchip Technology Inc.
Introduction
1.2
OPERATIONAL REQUIREMENTS
To communicate with, and to program an evaluation board, the following hardware and
software are needed:
•
•
•
•
•
1.3
PC-compatible system with a CD-ROM drive
One available USB port on the PC or a powered USB hub
An additional USB port for the PICkit Serial Analyzer (optional)
Microsoft® Windows® XP SP2, Windows Vista (32-bit), or Windows 7
One of the following debugging/programming development tools:
- PICkit 3 In-Circuit Programmer/Debugger (PG164130), or
- MPLAB ICD 3 In-Circuit Debugger (DV164035), or
- MPLAB REAL ICE™ In-Circuit Emulator (DV244005) with the RJ-11 to
ICSP™ Adaptor (AC164110)
INITIAL BOARD SETUP
With its preinstalled demonstration application, an evaluation board is designed to be
used right out of the box. Except for a single USB connection to a computer for power,
no additional hardware or configuration is necessary.
1.3.1
Installing the Software
Before you use the evaluation kit or an accessory board, it is important that you have
installed the Microchip MPLAB Integrated Development Environment (IDE). MPLAB
IDE provides the assembler tools you will use for development. You will also need a C
compiler for the demonstration code. The MPLAB C Compiler seamlessly integrates
into MPLAB IDE. Both the MPLAB IDE and C Compiler are free (see the note below)
and are available for download from the Microchip web site at:
www.microchip.com/MPLAB and www.microchip.com/compilers, respectively.
Note:
1.3.2
The Standard Evaluation (Free) Version supports all optimization levels for
60 days, but then reverts to optimization level 0, or 1 only.
Connecting the Hardware
Prior to connection, place the evaluation board on a flat surface near the computer.
Check to make sure that there are no objects between the board and the surface
upon which it is sitting. Once the evaluation kit software is installed, connect the
provided USB cable (A to mini-B) to any available USB port on the PC or powered
hub, and then to the board at the mini-B receptacle. The PC USB connection
provides power to the board.
The default code uses the 8-button board. Refer to Section 2.2.1 “8-Key Direct
Plug-in Daughter Board” for more information on connecting this daughter board to
an evaluation board.
After connecting the daughter board to the evaluation board and applying power, the
firmware application will illuminate all of the LEDs on the board at start-up. Any finger
presses on the daughter board will cause the associate LED to illuminate. If this does
not occur, refer to Chapter 5. “Troubleshooting”.
© 2009-2012 Microchip Technology Inc.
DS41385F-page 17
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
NOTES:
DS41385F-page 18
© 2009-2012 Microchip Technology Inc.
ENHANCED mTouch™ CAPACITIVE
TOUCH EVALUATION KIT AND
ACCESSORY BOARDS USER’S GUIDE
Chapter 2. Demonstration Application
This chapter describes the touch sense application that is preprogrammed on the
PIC16F, PIC18F, PIC24F, PIC24H and PIC32 microcontrollers, and its general
principles of operation. Topics included in this chapter are:
• Introduction to the Touch Interface
• Individual Touch Sense Demonstrations
2.1
INTRODUCTION TO THE TOUCH INTERFACE
Microchip’s mTouch capacitive touch sensing techniques are voltage-based scanning
methods that detect whether a key or button is pressed or not pressed (asserted/unasserted) using the change in the capacitance of a key or button, which is caused by contact with the user’s finger. The change in capacitance creates a change in voltage that
is measured by an on-chip Analog-to-Digital converter (ADC) module.
PIC16F, PIC24H, and PIC32 microcontrollers without a CTMU module use the Sample
and Hold (S&H) capacitor of an on-chip ADC to move the charge to or from each key
or button. When two capacitors at different voltages are connected, a voltage divider is
formed, which explains why the technique is known as Capacitive Voltage Divider
(CVD).
To charge a key or button, the ADC module is connected to an output pin that is pulled
high, and is then switched to the pin of the key/button circuit. This process is repeated
up to four times. The ADC module is then used to measure the resulting voltage.
Discharging a key/button circuit with the ADC module also involves switching the ADC
module between the key/button pin and an output pin; however, in this case, the output
pin is low (i.e., grounded) and the key/button circuit has been previously charged. The
key/button circuit is brought to VDD by converting the key/button pin on the device to an
output pin that is pulled high before changing the pin back to an input pin. With the
key/button circuit charged, the ADC module can then begin to discharge the circuit one
S&H capacitor value at a time.
Since the ADC module can source or sink a charge to or from the key/button circuit, it
can be used to provide a differential touch measurement. If VPOS is the voltage measurement when the ADC module sources current, and VNEG is the voltage measurement when the ADC module sinks current, this would result in VDIF = VPOS – VNEG.
Differential measurements provide greater noise immunity compared to just using
VPOS or VNEG.
Note:
Please refer to the Microchip application note AN1298 “Capacitive Touch
Using Only an ADC (“CVD”)” for more details on capacitive touch
measurements without a CTMU module.
© 2009-2012 Microchip Technology Inc.
DS41385F-page 19
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
PIC18F, PIC24F, and some PIC32 microcontrollers use an on-chip Charge Time Measurement Unit (CTMU) module to charge each button and an on-chip ADC module to
measure the resulting voltage. The CTMU consists of a constant current source that
provides a highly repeatable charge to each key or button. When any additional capacitance is added to the key/button circuit (from the touch of a fingertip, for example), this
charge results in a lower voltage compared to the voltage seen on the circuit without
the additional capacitance. This change in voltage is how the microcontroller with an
on-chip ADC module detects a touch event.
Note:
Please refer to Microchip application note AN1250 “Microchip CTMU for
Capacitive Touch Applications” for more details on how the CTMU and ADC
modules work together to measure capacitive touch.
For detailed information on the CTMU module, please refer to the related “Charge
Time Measurement Unit (CTMU)” Family Reference Manual section, which is
available from the Microchip web site.
Each evaluation board can be used with these sensor daughter boards:
• 2-Channel Slider Plug-in Daughter Board
• 4-Channel Slider Plug-in Daughter Board
• 8-Key Direct Plug-in Daughter Board
• 12-Key Matrix Plug-in Daughter Board
A more detailed description of evaluation board operation is provided in Chapter
4. “Evaluation Board Hardware”.
The response of the sensor to fingertip touch is influenced by many factors, such as
touch areas, voltage and current levels, ambient humidity, static buildup, and so on.
The capacitive touch sensing is done by a relative shift in the capacitance due to the
addition of the finger capacitance to the touch sensor. The demonstration code
supplied takes most of the typical environmental factors into consideration. The
demonstration application is very flexible in the sense that it can be modified by the
user.
DS41385F-page 20
© 2009-2012 Microchip Technology Inc.
Demonstration Application
2.2
INDIVIDUAL TOUCH SENSE DEMONSTRATIONS
2.2.1
8-Key Direct Plug-in Daughter Board
The 8-Key Direct Plug-in Daughter Board is an 8-channel plug-in board with each key
directly mapped to a sensor channel. This board can be interfaced with eight channels
out of the 16 channels provided in the Enhanced mTouch Capacitive Touch Evaluation
Kit and Accessory Boards. Touching any one of the keys on the plug-in board will
illuminate the corresponding LED on the evaluation board.
Figure 2-1 shows the default plug-in channels of the 8-Key Direct Plug-in Daughter
Board for the PIC24F CTMU, PIC24H CVD, and PIC32 CVD Evaluation Boards.
FIGURE 2-1:
DEFAULT PLUG-IN CHANNELS FOR 8-KEY PLUG-IN BOARD
(PIC24F CTMU, PIC24H CVD, AND PIC32 CVD)
The default firmware for all evaluation boards uses the 8-Key Direct Key Plug-in
Daughter Board. Refer to Table 2-1 for the J3/J4 sensor channels that are used for the
specific evaluation board.
TABLE 2-1:
Evaluation
Board
PIC16F CVD
DEFAULT J3/J4 CONNECTOR PLUG-IN CHANNELS
Sensor Daughter Board
8-Key Direct
12-Key Matrix
4-Channel
Slider
2-Channel
Slider
0-7
0-6
0-3
0-1
PIC18F CTMU
0-7
6-12
0-3
0-1
PIC24F CTMU
8-15
8-14
0-3
0-1
PIC24H CVD
8-15
8-14
0-3
0-1
PIC32 CTMU
0-7
0-6
0-3
0-1
PIC32 CVD
8-15
8-14
0-3
0-1
© 2009-2012 Microchip Technology Inc.
DS41385F-page 21
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
2.2.2
12-Key Matrix Plug-in Daughter Board
The 12-Key Matrix Plug-in Daughter Board is an array of 12 touch-sensitive keys
arranged in a 4x3 matrix (required 3 + 4 = 7 sensor inputs). Touching any one of the
keys will illuminate one of the LEDs. The 12-Key Matrix Plug-in Daughter Board is
numbered from 0 to 11, which corresponds to LEDs D1 to D12, respectively.
Refer to Table 2-1 for the J3/J4 sensor channels that are used by each evaluation
board when connected to the 12-Key Matrix Plug-in Daughter Board.
2.2.3
2-Channel and 4-Channel Slider Plug-in Daughter Boards
Touching anywhere along the length of the slider causes all the LEDs to illuminate as
a bar graph that is representative to the position of the touch. The LED bar graph follows the finger as it moves up and down along the length of the slider, and remains at
the last position on the slider when the finger is removed.
The default firmware loaded in the 2-Channel Slider Plug-in Daughter Board, is configured such that, channels 0 and 1 of connector J4/J3 in the evaluation kit are connected
to the two channels in the 2-Channel Slider Plug-in Daughter Board.
The default firmware for the 4-Channel Slider Plug-in Daughter Board, is configured
such that, channels 0, 1, 2, and 3 of connector J4/J3 in the main evaluation board are
connected to the four channels in the 4-Channel Slider Plug-in Daughter Board (see
Figure 2-2).
FIGURE 2-2:
DS41385F-page 22
DEFAULT PLUG-IN CHANNELS FOR 4-CHANNEL SLIDER
PLUG-IN DAUGHTER BOARD
Note 1:
The plug-in daughter boards can be interfaced to any of the channels in
the evaluation kit by changing the configuration settings. The details of
the configuration settings are explained in the Readme.txt file, which is
distributed in each demonstration.
2:
Plugging in a sensor board while an evaluation board is running, may
require resetting the touch algorithm, most easily done by cycling power.
© 2009-2012 Microchip Technology Inc.
Demonstration Application
The recommended approach, as shown in Figure 2-3 and Figure 2-4, is to first connect
the sensor daughter board, and then apply power to the evaluation board by
connecting the USB cable to the evaluation board.
FIGURE 2-3:
PLUG IN THE SENSORS BEFORE POWERING THE BOARD
FIGURE 2-4:
PLUG IN POWER AFTER SYSTEM IS CONFIGURED
© 2009-2012 Microchip Technology Inc.
DS41385F-page 23
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
NOTES:
DS41385F-page 24
© 2009-2012 Microchip Technology Inc.
ENHANCED mTouch™ CAPACITIVE
TOUCH EVALUATION KIT AND
ACCESSORY BOARDS USER’S GUIDE
Chapter 3. ProfiLab-Expert™ Graphical User Interface for
Real-Time Debugging
This chapter describes the ProfiLab-Expert™ Graphical User Interface (GUI), which
can be used for real-time debugging of the Enhanced mTouch Capacitive Touch
Evaluation Kit and Accessory Boards.
3.1
OVERVIEW
Real-time debugging support for mTouch software on the mTouch evaluation boards is
supported by a stand-alone Windows® executable, mTouch GUI.exe, and an
associated ProfiLab-Expert project, both of which are provided in the MPLAB mTouch
projects for these boards. It is important to note that it is not necessary to purchase
ProfiLab-Expert to make use of these project and executable files.
ABACOM’s ProfiLab-Expert supports the development of Windows GUIs using a
graphical programming paradigm. Optionally, users can purchase ProfiLab-Expert and
adapt or extend the projects provided to support real-time debugging needs for most
mTouch projects. For more information on ProfiLab-Expert, visit the ABACOM web site
at: http://www.abacom-online.de/uk/html/profilab-expert.html
Note:
3.2
Refer to Appendix B. “Adding Features to a ProfiLab-Expert™ GUI” for
more information on ProfiLab-Expert and how to extend the GUI by adding
new features.
GUI SETUP
3.2.1
Operation Principles and Benchtop Setup
The basic principle of operation is for the mTouch application to format a text string of
five-digit decimal numbers that are separated by commas, and output this data through
the UART transmit (TX) pin on the device. Using a PICkit™ Serial Analyzer running
special firmware, a ProfiLab-Expert GUI can display this data in real-time on a PC. The
button status, button asserts, slider values, and button voltage measurements are
displayed by the GUI, while the UART data can be captured in ASCII text files for later
analysis.
In fact, once the UART TX pin is active, the same data can be captured by a simple
COM-port application, such as HyperTerminal (or equivalent) for later analysis using
Excel® or Matlab®, or GNU Octave.
A typical benchtop setup is shown in Figure 3-1. The UART receive (RX) pin of the
PICkit Serial Analyzer is connected to a UART TX pin on connector J2. Refer to the
ReadMe file (1st Read Me.txt) of each mTouch application to determine which pins
of the J2 connector are used. A summary PICkit Serial Analyzer to evaluation board
pin assignment is provided in Table 3-1.
© 2009-2012 Microchip Technology Inc.
DS41385F-page 25
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
FIGURE 3-1:
TYPICAL BENCHTOP SETUP
Ev
a
lu
at
io
n
Bo
ar
d
8K
Da ey
ug Dir
ht ec
er t S
Bo en
ar so
d r
To PC
RJ
-1
1
to
IC
S
P™
Ad
ap
to
r
To PC
To PC
PICkit™ Serial Analyzer to
Evaluation Board Adaptor Cable
TABLE 3-1:
PICkit™ SERIAL ANALYZER HEADER PIN TO EVALUATION BOARD
HEADER (J2) PIN
PICkit™ Serial
Analyzer Header
Pin
Function
PIC16F CVD
Evaluation Board
J2 Pin
Function
PIC18F CTMU
Evaluation Board
J2 Pin
Function
PIC32 CTMU
Evaluation Board
J2 Pin
Function
All Other Evaluation
Boards
J2 Pin
Function
1
TX
1
UART RX
5
RC0/RP11
5
RA9
11
RF4
3
Ground
3
Ground
1
Ground
1
RC5
1
Ground
6
RX
6
UART TX
12
RB4/RP7
3
RC4
12
RF5
Connection Type
DS41385F-page 26
Direct Plug-in
Using Interface Cable
© 2009-2012 Microchip Technology Inc.
ProfiLab-Expert™ Graphical User Interface for Real-Time Debugging
The PIC16F CVD Evaluation Board allows for a direct connection of the PICkit Serial
Analyzer (DV164122), as shown in Figure 3-2.
To PC for Board Power
8K
Da ey
ug Dir
ht ec
er t S
Bo en
ar so
d r
PIC16F CVD EVALUATION BOARD CONNECTED TO A PICkit™ SERIAL
ANALYZER
Ev PI
alu C1
at 6F
ion C
BoVD
ar
d
FIGURE 3-2:
To PC
As shown in Figure 3-3, all mTouch Evaluation Boards can be directly connected to a
PICkit 3 In-Circuit Programmer/Debugger (PG164130).
To PC for Board Power
To PC
8K
Da ey
ug Dir
ht ec
er t S
Bo en
ar so
d r
EVALUATION BOARD CONNECTED TO A PICkit™ 3 IN-CIRCUIT
PROGRAMMER/DEBUGGER
Ev PI
alu C1
at 6F
ion C
BoVD
ar
d
FIGURE 3-3:
To PC
© 2009-2012 Microchip Technology Inc.
DS41385F-page 27
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
3.2.2
PICkit Serial Analyzer to Evaluation Board Adaptor Cable
Figure 3-4 provides details of a PICkit Serial Analyzer to Evaluation Board adaptor
cable. This cable supports all evaluation boards, with the exception of the PIC16F
CVD, which does not need an adaptor cable since the PICkit Serial Analyzer can
directly plug into the J2 connector on the PIC16F CVD Evaluation Board.
One end of the cable plugs into the 6-pin socket of the PICkit Serial Analyzer. The other
end plugs into the 2x6-pin J2 socket on the evaluation board. Pin 1 of this connector
connects to pin 1 of the J2 socket, providing ground for the PICkit Serial Analyzer. The
connector is taller than the J2 socket, with the excess pins hanging off the bottom of
the socket. These pins (13-18) support two jumpers, which configure the cable for all
evaluation boards based on jumper settings, which are shown in Figure 3-4.
FIGURE 3-4:
PICkit™ SERIAL ANALYZER TO EVALUATION BOARD J2 ADAPTOR CABLE
PICkit™ Serial Analyzer
Connector
DS41385F-page 28
Evaluation Board
J2 Connector
© 2009-2012 Microchip Technology Inc.
ProfiLab-Expert™ Graphical User Interface for Real-Time Debugging
3.2.3
Configuring the Hardware
The Enhanced mTouch Capacitive Touch Evaluation Kit includes a PICkit™ Serial
Analyzer unit, allowing USART communication to be routed into and out of an
evaluation board, and from/to a PC through a USB connector. The mTouch Sensing
Solution GUI uses standard COM-based communication. The PICkit Serial Analyzer
comes preprogrammed with code performing native Windows® USB communication
(Human Interface Device mode). This unit needs to be reprogrammed, so that
Windows uses it as a COM-device (Communication Device Class mode).
1. After installing the Microchip Application Libraries, which are available from the
Microchip Web site (www.microchip.com/MAL/), go to the Microchip Group in the
Start menu, and run the \mTouchCap Library vx.xx\PIC16F CVD Framework\
Pickit Serial Loader Utility. The PICkit Loader window appears, as shown
in Figure 3-5.
FIGURE 3-5:
PICkit™ SERIAL LOADER UTILITY
© 2009-2012 Microchip Technology Inc.
DS41385F-page 29
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
2. Follow the on-screen instructions to prepare the PICkit Serial Analyzer for
programming, and then click Browse to select the code file, as shown in
Figure 3-6.
FIGURE 3-6:
LOADING THE FIRMWARE
3. Click Open. The following window appears, as shown in Figure 3-7.
FIGURE 3-7:
STARTING PICkit™ SERIAL UPDATE
DS41385F-page 30
© 2009-2012 Microchip Technology Inc.
ProfiLab-Expert™ Graphical User Interface for Real-Time Debugging
4. Click START to begin the serial update. A programming status window appears
indicating the operation may take a few minutes to complete, as shown in
Figure 3-8. Once the update has completed, a notification window appears, as
shown in Figure 3-9.
FIGURE 3-8:
PROGRAMMING STATUS
FIGURE 3-9:
SUCCESSFUL PROGRAMMING NOTIFICATION
© 2009-2012 Microchip Technology Inc.
DS41385F-page 31
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
3.2.4
Connecting the PICkit Serial Analyzer to the Evaluation Board
and the PC
For the PIC16F CVD Evaluation Board, connect the PICkit Serial Analyzer directly into
the J2 connector on the board, which are the PICkit Serial pins. (The other set of six
pins on the edge of the board, which are labeled J1 (PICkit 2) support an MPLAB
debugger.)
For all other boards, follow the connection setup shown in Table 3-1, or use the adaptor
cable (see Figure 3-4) after setting the jumpers for the board you are using.
Connect the PICkit Serial Analyzer to your PC using a USB A to mini-B cable.
3.2.5
Launching the mTouch GUI
Launch the standalone GUI executable by the start menu:
1. Select microchip mTouch GUI.
2. Select mTouch GUI.
If you have installed ProfiLab, you can launch ProfiLab and modify the GUI by selecting
mTouch GUI project instead of the mTouch GUI.
See Appendix B. “Adding Features to a ProfiLab-Expert™ GUI” for details on how
to modify this project to add new features.
DS41385F-page 32
© 2009-2012 Microchip Technology Inc.
ProfiLab-Expert™ Graphical User Interface for Real-Time Debugging
3.2.6
Configuring the mTouch GUI with the Correct COM Port
The mTouch GUI uses standard asynchronous UART/USART communication. In the
Windows environment, it uses a standard COM port. The GUI must know what COM
port has been assigned to the PICkit Serial Analyzer when it is plugged into a PC USB
port. You can use the Windows Device Manager to check which COM port has been
assigned:
1. Open the Windows Device Manager.
2. In Ports (COM & LPT), determine which COM port number is assigned to the
PICkit Serial Analyzer, as shown in Figure 3-10.
FIGURE 3-10:
© 2009-2012 Microchip Technology Inc.
CHECKING THE COM PORT NUMBER
DS41385F-page 33
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
Alternately, you can use a terminal emulator, such as RealTerm, which is available from
http://realterm.sourceforge.net/. This terminal emulator allows you to not only identify
which COM port the PICkit Serial Analyzer is using, but it also allows you to check the
integrity of the data being received. Launch the terminal emulator, and then check
which COM ports are available. Next, open this COM port with 115,200 Baud, 8 bits
(Data), no Parity, and one Stop bit. You should see lines of 5-bit non-negative decimal
integers, separated by commas.
1. Once the COM port number is known, launch the GUI and click the red and white
screwdriver icon (located at the top right of the main GUI screen) to open the
Configuration window, as shown in Figure 3-11.
2. Double click Serial Interface ($CR1), which opens the COM receive string
dialog.
3. In the COM Receive string combo box, select the port assigned to the PICkit
Serial Analyzer. Set all other options as shown in Figure 3-11, click OK, and then
click Close.
FIGURE 3-11:
COMMUNICATION SETTINGS
Click the screwdriver icon to open the Configuration window
Click Serial Interface ($CR1) to select the COM port
DS41385F-page 34
© 2009-2012 Microchip Technology Inc.
ProfiLab-Expert™ Graphical User Interface for Real-Time Debugging
If the mTouch application is properly connected, you should start receiving the button
readings, which will immediately update the graphs on the plotter in the main window,
as well as the raw readings, and the Min and Max for each channel or sensor. If you
start touching the buttons, you should easily find the ones mapped to Buttons 1 to 4
and immediately see the corresponding LEDs on the display, reflecting any change to
each button state. The graphs on the plotter should also reflect any change made to
the corresponding four buttons.
© 2009-2012 Microchip Technology Inc.
DS41385F-page 35
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
3.3
mTouch GUI SCREENS
The mTouch GUI has four tabbed screens: Channels 1-4, Channels 5-8, Channels
9-12, and Virtual Keypads. The first three screens show real-time button voltages for
four buttons at a time. The last screen provides virtual keypads, reflecting the current
state of the mTouch demonstration application, as reported by the UART to PICkit
Serial Analyzer interface.
3.3.1
Voltage Plots
As shown in Figure 3-12, the first tabbed screen provides normalized button voltage
plots for the first four buttons/keys. If the mTouch communication parameters are
properly set, the voltage should change as these buttons are pressed.
FIGURE 3-12:
VOLTAGE PLOT FOR CHANNELS 1-4
Matrix Keys Channel 4 is all ‘0’s
Matrix Keys Channels 1-3 are columns 1-3
DS41385F-page 36
© 2009-2012 Microchip Technology Inc.
ProfiLab-Expert™ Graphical User Interface for Real-Time Debugging
Figure 3-13 shows the plot control interface, which is located at the bottom of the
Channels 1-4 screen. Similarly, controls (minus the adjustment for Max Adjusted ADC
Count and All Data Logger) are found on the two other voltage plot screens.
FIGURE 3-13:
VOLTAGE PLOT CONTROLS
Save voltage Save all
plot data
UART data
to ASCII file to ASCII file
Reset Minimum and
Maximum for all channels
Quit data collection Delta = Max – Min
and exit the GUI
Maximum
ADC Count
Record/Stop
Erase file
recording and start over
The QUIT button, located at the bottom left of the screen, stops data collection and
terminates the GUI.
To the right of the QUIT button, is the Reset Min/Max button that resets all of the
maximum/minimum/delta values for all 12 input channels. These statistics allow
measuring button assertion voltage swings for each sensor channel. The Reset
Min/Max button allows you to reset the maximum/minimum/delta values so that new
button assertions can be measured without restarting the GUI.
Most 16-bit and 32-bit mTouch applications report measured button voltages as scaled
and averaged ADC measurements, which are stored as unsigned 16-bit integers.
Based on this, the Max Adjusted ADC Count is likely to be 65,535 (216 – 1). Button
voltages are plotted normalized to this value, where 1.0 on the plot represents this
maximum value. If the mTouch application uses a different normalization in reporting
button voltages, the plots can be adjusted by changing the Max Adjusted ADC Count,
which is just to the right of the Max, Raw, Min, and Delta fields.
The REC/STOP button for the Plot Logger function starts and stops data recording into
text files. Voltages from screens 1-3 are saved in the .\ProfiLabGUIs\mTouch
GUI\Executable\Data\ folder as Record Page 1.txt through Record Page 3.txt.
Data recorded using the REC/STOP button for the All Data Logger function is recorded
in the .\ProfiLabGUIs\mTouch GUI\Executable\Data\ as All Data Dump.txt. The
corresponding reset buttons clears the contents of the related ASCII file. All four ASCII
text files are also cleared when the GUI is started. Therefore, it is recommended to
move data files from a capture session out of the .\ProfiLabGUIs\mTouch GUI\
Executable\Data\ folder before restarting the GUI.
The format of voltage capture files (Record Page 1.txt, Record Page 2.txt, and
Record Page 3.txt) is four columns of non-zero decimal numbers, one for each
channel input. Each line in the file has four values, separated by semicolons.
Example 3-1 shows a button assertion in the first column.
EXAMPLE 3-1:
41519;
38447;
35375;
32303;
29231;
26159;
24263;
41581;
41589;
41589;
41577;
41557;
41527;
41381;
© 2009-2012 Microchip Technology Inc.
38021;
37991;
38003;
37977;
38001;
37985;
37997;
36995
37049
37047
37049
37035
37031
37033
DS41385F-page 37
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
The All Data Dump.txt file has sixteen columns of non-zero decimal numbers, with
the first three columns being button status, button asserts, and the slider value. The
next twelve columns represent button voltages if the sixteenth (last) column is zero. A
non-zero sixteenth column value represents a special record sent by the mTouch
application and saved in the All Data Dump.txt file, but is otherwise ignored by the
mTouch GUI. An example of All Data Dump.txt content is shown in Example 3-2.
EXAMPLE 3-2:
0;
0;
0;
0;
0;
0;
0;
0;
0;
0;
0;
0;
0;
0;
0;
24160;
23648;
23744;
41519;
41519;
41536;
41440;
41536;
41519;
41519;
37568;
37984;
37952;
37975;
37975;
36864;
37024;
36992;
36985;
36985;
39936;
39904;
39552;
39911;
39911;
38144;
38080;
37984;
38087;
38087;
37504;
37152;
37472;
37481;
37481;
36160;
36128;
36288;
36213;
36213;
0;
0;
0;
0;
0;
0;
0;
0;
0;
0;
0;
0;
0;
0;
0;
0;
0;
0;
0;
0;
29
30
31
32
0
As seen in Figure 3-13, this first screen shows column voltages for a Matrix Key
application. For a Matrix Key application the second screen, Channels 5 - 8, as shown
in Figure 3-14, shows the voltages for all four key columns on the sensor daughter
board.
FIGURE 3-14:
VOLTAGE PLOT FOR CHANNELS 5-8
Matrix Keys Channels 5-8 are rows 1-4
DS41385F-page 38
© 2009-2012 Microchip Technology Inc.
ProfiLab-Expert™ Graphical User Interface for Real-Time Debugging
3.3.2
Virtual Keypads
The UART interface reports the current button status, as well as the current button
voltages. Button status is shown on the fourth screen, Virtual Keypads, as shown in
Figure 3-15. Some mTouch demonstration applications provide multiple interpretations
of button status in the UART report, showing which buttons are pressed, which buttons
have been asserted, and an equivalent slider value for the buttons that are pressed.
These are all displayed on the Virtual Keypads screen.
FIGURE 3-15:
VIRTUAL KEYPADS SCREEN
Prior Button Assert
Current Button Press
© 2009-2012 Microchip Technology Inc.
Equivalent Slider Value
DS41385F-page 39
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
3.3.3
Configuring Voltage Plots
A right mouse click in the middle of any voltage plot will bring up a menu of plotting
options. Selecting Settings from the pop-up menu will enable editing of the plot format.
Figure 3-16 shows how to increase the line width of the Channel 1 plot (represented by
the thick red line) and the resulting change in the voltage plot.
FIGURE 3-16:
CONFIGURING VOLTAGE PLOTS
Increasing Channel 1 Line Width
DS41385F-page 40
© 2009-2012 Microchip Technology Inc.
ProfiLab-Expert™ Graphical User Interface for Real-Time Debugging
Figure 3-17 shows an enlarged view of the visible plot controls on each plotting screen,
which allow for various screen manipulations, including printing the plot or copying it to
the clipboard.
FIGURE 3-17:
PLOT CONTROLS
Print Plot
Stop
Copy plot
to Clipboard
Record
Delta time
between samples
Y Zoom +
Plot Settings
Y Zoom –
Scroll Time
Forward
X Zoom +
Scroll Time
Back
X Zoom –
Zoom All
Reset Zoom
© 2009-2012 Microchip Technology Inc.
DS41385F-page 41
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
NOTES:
DS41385F-page 42
© 2009-2012 Microchip Technology Inc.
ENHANCED mTouch™ CAPACITIVE
TOUCH EVALUATION KIT AND
ACCESSORY BOARDS USER’S GUIDE
Chapter 4. Evaluation Board Hardware
This chapter provides a functional overview of the evaluation boards and identifies the
major hardware components. Topics covered include:
• Application Functional Overview
• Board Components
4.1
APPLICATION FUNCTIONAL OVERVIEW
4.1.1
PIC16F CVD Evaluation Board
For the PIC16F CVD Evaluation Board, ICSP lines are provided via the PICkit 3 header
(J1). A mini-USB connector (J5) can provide power to the board. The PICkit Serial
Analyzer may be used to communicate with the mTouch Sensing Solution GUI through
asynchronous communication. For this board, do not use both the USB and PICkit tools
to power the board at the same time (the USB connection has a 3.3V regulator used to
regulate the USB power, while the PICkit tools have their own regulator straight to the
device). ICSPCLK and ICSPDAT share pins with active-low LEDs (D6 and D7), which
can cause problems when debugging. To use in-circuit serial debugging, remove
jumper J4 to disconnect these two LEDs.
FIGURE 4-1:
PIC16F CVD EVALUATION BOARD APPLICATION-SIDE BLOCK DIAGRAM
J2
I2C PICkit™
Serial Header
I2C™
J1
Programming
Header
ICSP™
16 LEDs (D1-D16)
PIC16F1937
ICSPDAT
ICSPCLK
MCLR
VDD
VSS
7-Channel
Matrix Key
Plug-in Board
2-Channel
Slider Plug-in
Board
4-Channel
Slider Plug-in
Board
Sensor Boards
GPIO
J4
CVDO:13
J3
J5
VDD
Vss
USB mini-B
Receptacle
8-Channel
Direct Key Slider
Plug-in Board
PLUG-IN BOARDS
© 2009-2012 Microchip Technology Inc.
PIC16F CVD EVALUATION BOARD
DS41385F-page 43
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
4.1.2
PIC18F CTMU Evaluation Board
The PIC18F CTMU Evaluation Board (see Figure 4-2) is similar to the PIC24F CTMU
Evaluation Board except for the change in the number of ADC channels. The
PIC18F46J50 microcontroller on the PIC18F CTMU Evaluation Board has 13 ADC
channels, which are used by the touch sense application as the sensing channels.
Note:
PIC18F CTMU Evaluation Board firmware uses only 13 channels for touch
sense applications and channels 13 to 15 are unused in the PIC18F CTMU
board.
The PIC18F microcontroller uses its on-chip USB engine and transceiver to
communicate to the PC-side interface application, using the USB mini-B receptacle.
The evaluation board also uses the USB receptacle for application power as a
bus-powered device.
Microcontroller and LED power are provided from the VBUS by Q1, an MCP1702
voltage regulator. Provisions on the board allow for the user to add components and
create an externally powered application.
Note:
FIGURE 4-2:
Unlike the PIC24F CTMU Evaluation Board, the ICD interface (PGC and
PGD) on the PIC18F Evaluation Board is not shared with any of the CTMU
channels.
PIC18F CTMU EVALUATION BOARD APPLICATION-SIDE BLOCK DIAGRAM
16 LEDs (D1-D16)
PIC18F46J50
J1
Programming
Header
ICSP™
PGC/EMUC
PGD/EMUD
MCLR
7-Channel Matrix
Key Plug-in
Board
2-Channel
Slider Plug-in
Board
4-Channel
Slider Plug-in
Board
D8-D15
Direct Key Plug-in
Board LEDs
D1-D12
Matrix Key Plug-in
Board LEDs
RD0-RD7
D1-D16
J4
2-Channel and
4-Channel Slider
Plug-in LEDs
AN0:AN15
J3
J5
USB mini-B
Receptacle
D+/D-
8-Channel
Direct Key
Plug-in Board
PLUG-IN BOARDS
DS41385F-page 44
Q1
Power Supply
(3.3V)
PIC18F CTMU EVALUATION BOARD
© 2009-2012 Microchip Technology Inc.
Evaluation Board Hardware
4.1.3
PIC24F CTMU Evaluation Board
The operation of the PIC24F CTMU Evaluation Board (see Figure 4-3) is managed by
the PIC24F microcontroller, which requires very little additional hardware to perform its
tasks. In addition to the touch sense demonstration application code, the preloaded
demonstration uses substantial parts of the Microchip USB Stack Library to provide a
hardware interface to the PC-based mTouch Sensing Solution diagnostic tool.
FIGURE 4-3:
PIC24F CTMU EVALUATION BOARD APPLICATION-SIDE BLOCK DIAGRAM
16 LEDs (D1-D16)
PIC24FJ128GB106
J1
Programming
Header
ICSP™
PGC/EMUC
PGD/EMUD
MCLR
D8-D15
Direct Key Plug-in
Board LEDs
D1-D12
Matrix Key Plug-in
Board LEDs
RD0-RD7
7-Channel Matrix
Key Plug-in
Board
RE0:RE7
D1-D16
J4
2-Channel
Slider Plug-in
Board
2-Channel and
4-Channel Slider
Plug-in LEDs
AN0:AN15
J3
4-Channel
Slider Plug-in
Board
J5
D+/D-
8-Channel
Direct Key
Plug-in Board
USB mini-B
Receptacle
Q1
Power Supply
(3.3V)
PLUG-IN BOARDS
PIC24F CTMU EVALUATION BOARD
The touch sense application uses the PIC24F microcontroller’s CTMU and all 16 of the
microcontroller’s analog-to-digital (A/D) input channels to monitor touch interfaces. The
CTMU functions by sensing small changes in capacitance on its inputs, such as those
occurring when a person touches the copper pad electrodes. By continuously
monitoring for these changes, the CTMU can determine when a touch event occurs.
The sensors on the evaluation board comprise carefully placed circuit traces and
capacitive touch pads.
The evaluation board comprises 16 A/D channels of the PIC24F microcontroller
connected to connector, J4/J3. This connector is used to interface the plug-in boards
to the evaluation board.
The plug-in boards can be connected to any of the 16 channels of the connector (J3/J4)
by changing the configuration settings, which is explained in the Readme.txt file.
A total of 16 LEDs are provided in the evaluation board. These LEDs are driven directly
by the microcontroller through pins on PORTD and PORTE. When an event occurs, the
application firmware also provides feedback by activating one or more LEDs at that
location. The sequence for the activation of the LEDs depends on the type of touch
pads that is interfaced to the evaluation board.
The microcontroller uses its on-chip USB engine and transceiver to communicate to the
PC side interface application, using the USB mini-B receptacle. The evaluation board
also uses the USB receptacle for application power as a bus-powered device.
Microcontroller and LED power are provided from the VBUS by Q1, an MCP1702
voltage regulator. Provisions on the board allow for users to add components and
create an externally powered application.
© 2009-2012 Microchip Technology Inc.
DS41385F-page 45
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
For users interested in using the evaluation board as an experimental platform, the
microcontroller can be reprogrammed using the ICSP connector. A 6-pin header is
provided for connecting the evaluation board to any programmer that is compatible with
MPLAB ICD 3. Since the ICD interface (PGD and PGC) shares some input channels
of the connector, J4/J3 (channel 6 and 7), necessary care should be taken when the
debugger is enabled.
The firmware in the evaluation board will have the default plug-in board channel
configurations, which is explained in the Readme.txt file. The user can reconfigure
the channels based on his application by referring to the Readme.txt file.
4.1.4
PIC24H CVD Evaluation Board
The PIC24H CVD Evaluation Board (see Figure 4-4) is based on the same layout as
the PIC24F CTMU and PIC32 CVD Evaluation Boards and has similar functional
characteristics as the PIC16F CVD Evaluation Board (I2C interface with host).
This board can be powered by the USB connector via a 3.3V regulator. Alternately, it
can be powered by a PICkit 3 In-Circuit Programmer/Debugger; however, do not
connect both devices at the same time.
FIGURE 4-4:
PIC24H CVD EVALUATION BOARD APPLICATION-SIDE BLOCK DIAGRAM
J2
I2C PICkit™
Serial Header
I2C™
J1
Programming
Header
ICSP™
ICSPDAT
ICSPCLK
MCLR
VDD
VSS
7-Channel
Matrix Key
Plug-in Board
2-Channel
Slider Plug-in
Board
4-Channel
Slider Plug-in
Board
16 LEDs (D1-D16)
PIC24HJ128GP506
Sensor Boards
GPIO
J4
AN0-AN15
J3
J5
USB mini-B
Receptacle
VDD
Vss
8-Channel
Direct Key Slider
Plug-in Board
PLUG-IN BOARDS
DS41385F-page 46
PIC24H CVD EVALUATION BOARD
© 2009-2012 Microchip Technology Inc.
Evaluation Board Hardware
4.1.5
PIC32 CVD Evaluation Board
The PIC32 CVD Evaluation Board (see Figure 4-5) is similar to the PIC24F CTMU
Evaluation Board. The evaluation board layout is almost identical due to the fact that
the PIC32MX795F512H and PIC24FJ128GB106 devices are pin-to-pin compatible.
The four daughter boards are connected to the J3/J4 connectors in the same manner.
As for functionality, the PIC32 CVD evaluation board has 16 LEDs to indicate touch
sensing while the USB interface is used for communicating with the host application for
visualization and diagnostic.
This board can be powered by the USB connector via a 3.3V regulator. Alternately, it
can be powered by a PICkit 3 In-Circuit Programmer/Debugger; however, do not
connect both devices at the same time.
FIGURE 4-5:
PIC32 CVD EVALUATION BOARD APPLICATION-SIDE BLOCK DIAGRAM
16 LEDs (D1-D16)
PIC32MX795F512H
J1
Programming
Header
ICSP™
PGC/EMUC
PGD/EMUD
MCLR
D8-D15
Direct Key Plug-in
Board LEDs
D1-D12
Matrix Key Plug-in
Board LEDs
RD0-RD7
7-Channel Matrix
Key Plug-in
Board
2-Channel
Slider Plug-in
Board
4-Channel
Slider Plug-in
Board
RE0:RE7
D1-D16
J4
2-Channel and
4-Channel Slider
Plug-in LEDs
AN0:AN15
J3
J5
D+/D-
8-Channel
Direct Key
Plug-in Board
PLUG-IN BOARDS
© 2009-2012 Microchip Technology Inc.
USB mini-B
Receptacle
Q1
Power Supply
(3.3V)
PIC32 CVD EVALUATION BOARD
DS41385F-page 47
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
4.1.6
PIC32 CTMU Evaluation Board
The PIC32 CTMU Evaluation Board (see Figure 4-6) is similar to the PIC24F CTMU
Evaluation Board except for the change in the number of ADC channels. The
PIC32MX220F032D microcontroller on the PIC32 CTMU Evaluation Board has 13
ADC channels, which are used by the touch sense application as the sensing channels.
Note:
PIC32 CTMU Evaluation Board firmware uses only 13 channels for touch
sense applications and channels 13 to 15 are unused in the PIC32 CTMU
board.
This board can be powered by the USB connector via a 3.3V regulator. Alternately, it
can be powered by a PICkit 3 In-Circuit Programmer/Debugger; however, do not
connect both devices at the same time.
Note:
FIGURE 4-6:
Unlike the PIC24F CTMU Evaluation Board, the ICD interface (PGC and
PGD) on the PIC32 Evaluation Board is not shared with any of the CTMU
channels.
PIC32 CTMU EVALUATION BOARD APPLICATION-SIDE BLOCK DIAGRAM
16 LEDs (D1-D16)
PIC32220F032D
J1
Programming
Header
ICSP™
PGC/EMUC
PGD/EMUD
MCLR
7-Channel Matrix
Key Plug-in
Board
2-Channel
Slider Plug-in
Board
4-Channel
Slider Plug-in
Board
D8-D15
Direct Key Plug-in
Board LEDs
D1-D12
Matrix Key Plug-in
Board LEDs
RD0-RD7
D1-D16
J4
2-Channel and
4-Channel Slider
Plug-in LEDs
AN0:AN15
J3
J5
USB mini-B
Receptacle
D+/D-
8-Channel
Direct Key
Plug-in Board
PLUG-IN BOARDS
DS41385F-page 48
Q1
Power Supply
(3.3V)
PIC32 CTMU EVALUATION BOARD
© 2009-2012 Microchip Technology Inc.
Evaluation Board Hardware
4.2
BOARD COMPONENTS
4.2.1
PIC16F CVD Evaluation Board
Figure 4-7 identifies the key hardware components that are common for the PIC16F
CVD Evaluation Board. There is one evaluation board and four plug-in daughter
boards. The four plug-in daughter boards are identified as direct keys, matrix keys,
2-channel slider and 4-channel slider.
FIGURE 4-7:
PIC16F CVD EVALUATION BOARD COMPONENT LAYOUT (TOP SIDE)
2
5
7
4
1
6
3
TABLE 4-1:
BOARD COMPONENTS
Reference
Component
1
PIC16F1937 microcontroller (U1) for the PIC16F CVD Evaluation Board
2
USB mini-B receptacle (J4)
3
ICSP™ programming header (J1)
4
Power supply (U3) to provide the VDD to the evaluation board
5
Plug-in sensor LEDs (D1-D14)
6
Plug-in interface connector (J3)
7
PICkit™ Serial Analyzer connector (J2)
© 2009-2012 Microchip Technology Inc.
DS41385F-page 49
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
4.2.1.1
COMPONENT DESCRIPTIONS
The components listed here (in order of their reference tags in Figure 4-7) are the key
components of the application side of the PIC16F CVD Evaluation Board:
1. PIC16F1937 Microcontroller (U1): This provides the processing power for the
touch sense applications in the PIC16F Evaluation Board.
2. USB mini-B Receptacle (J4): This provides power to the board via USB.
3. ICSP™ Programming Header (J1): This provides a standard Microchip ICD
interface for programming and debugging applications on an evaluation board. It
is designed to connect directly with Microchip's PICkit 3. Pin 1 is located on the
right side of the interface, as viewed from the front of the board, and is marked
with an arrow.
4. PICkit Serial Analyzer Connector (J2): This connector is used to exchange
data to the Host PC through ASYNC using the PICkit Serial Analyzer.
5. Power Supply (U3): This converts the +5 VDC from VBUS to the regulated
+3.3 VDC required by the evaluation board.
6. Plug-in Sensor LEDs (D1-D14): Fourteen LEDs (D1 through D14) are connected to one of the general purpose I/O ports of the PIC® microcontroller. These
LEDs are illuminated based on the need of the application.
7. Plug-in Interface Connector (J3): This is a 40-pin connector, which is used to
interface the different plug-in boards to the microcontroller. This connector is
interfaced to 14 analog channels of the microcontroller and the remaining pins
are connected to ground of the evaluation board.
DS41385F-page 50
© 2009-2012 Microchip Technology Inc.
Evaluation Board Hardware
4.2.2
PIC18F CTMU, PIC24F CTMU, PIC32 CVD, and PIC32 CTMU
Evaluation Boards
Figure 4-8 identifies the key hardware components that are common for the PIC18F
CTMU, PIC24F CTMU, PIC32 CVD, and PIC32 CTMU evaluation boards. There is one
evaluation board and four plug-in daughter boards. The four plug-in daughter boards
are identified as direct keys, matrix keys, 2-channel slider and 4-channel slider.
PIC18F CTMU, PIC24F CTMU, PIC32 CVD, AND PIC32 CTMU EVALUATION
BOARD COMPONENT LAYOUT (TOP SIDE)
10 11
R1
R2
R4
R3
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
5
12 13
14 15
FIGURE 4-8:
8
9
Y1
2
1d
7
1c
6
5
4
2 3
RF4 C18
RF1
RF3
4
RF0
C7
C13
J1
U1
6
1b
C4
1a
0
1
3
TABLE 4-2:
BOARD COMPONENTS
Reference
Component
1a
PIC24FJ128GB106 microcontroller (U1) for the PIC24F CTMU Evaluation Board
1b
PIC18F46J50 microcontroller (U1) for the PIC18F CTMU Evaluation Board
1c
PIC32MX795F512H microcontroller (U1) for the PIC32 CVD Evaluation Board
1d
PIC32MX220F032D microcontroller (U1) for the PIC32 CTMU Evaluation Board
2
USB mini-B receptacle (J5)
3
ICSP™ programming header (J1)
4
Power supply (Q1) to provide the VDD to the evaluation board
5
Plug-in sensor LEDs (D1-D16)
6
Plug-in interface connector (J4/J3)
© 2009-2012 Microchip Technology Inc.
DS41385F-page 51
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
4.2.2.1
COMPONENT DESCRIPTIONS
The components listed here (in order of their reference tags in Figure 4-8) are the key
components of the application side of an evaluation board, which are common for both
PIC18F and PIC24F CTMU evaluation boards except for the microcontroller used in
the board:
1a. PIC24FJ128GB106 Microcontroller (U1): This provides the processing power
for the touch sense demonstration applications. The microcontroller features 64
Kbytes of Flash program memory and 16 Kbytes RAM, allowing sufficient space
for the development of more complex touch sense applications.
The demonstration application uses an 8 MHz signal to create the 48 MHz USB
clock, as well as the application’s 32 MHz clock. Crystal, Y1, and associated
components are used by the microcontroller’s internal oscillator to maintain the
frequency tolerances required by the USB specifications.
1b. PIC18F46J50 Microcontroller (U1): This provides the processing power for the
touch sense applications in the PIC18F evaluation board. The microcontroller
features 64 Kbytes of Flash program memory and 3.8 Kbytes RAM. The demonstration application uses an 8 MHz signal to create the 48 MHz USB clock, as
well as the application’s 32 MHz clock. Crystal, Y1, and associated components
are used by the microcontroller’s internal oscillator to maintain the frequency
tolerances required by the USB specifications.
1c. PIC32MX795F512H Microcontroller (U1): This provides the processing power
for the touch sense applications in the PIC32 CVD evaluation board. The microcontroller features 512 Kbytes of Flash program memory and 128 Kbytes RAM.
The demonstration application uses an 8 MHz signal to create the 48 MHz USB
clock, as well as the application’s 40 MHz clock. Crystal, Y1, and associated
components are used by the microcontroller’s internal oscillator to maintain the
frequency tolerances required by the USB specifications.
1d. PIC32MX220F032D Microcontroller (U1): This provides the processing power
for the touch sense demonstration applications. The microcontroller features 32
Kbytes of Flash program memory and 8 Kbytes RAM, allowing sufficient space
for the development of more complex touch sense applications.
The demonstration application uses an 8 MHz signal to create the 48 MHz USB
clock, as well as the application’s 32 MHz clock. Crystal, Y1, and associated
components are used by the microcontroller’s internal oscillator to maintain the
frequency tolerances required by the USB specifications.
2. USB mini-B Receptacle (J5): This provides a convenient interface to the PC
side of the demonstration application. As the evaluation board functions as a
bus-powered device, this connection also provides power to the board.
3. ICSP™ Programming Header (J1): This provides a standard Microchip ICD
interface for programming and debugging applications on an evaluation board. It
is designed to connect directly with Microchip’s PICkit™ Starter Kit. Pin 1 (N/C)
is located on the right side of the interface, as viewed from the front of the board,
and is marked with an arrow.
4. Power Supply (Q1): This converts the +5 VDC from VBUS to the regulated
+3.3 VDC required by the evaluation board.
5. Plug-in Sensor LEDs (D1-D16): Sixteen LEDs (D1 through D16) are connected
to PORTD and PORTE of the PIC® microcontroller. These LEDs are illuminated
based on the need of the application.
6. Plug-in Interface Connector (J4/J3): This is a 48-pin connector, which is used
to interface the different plug-in boards to the microcontroller. This connector is
interfaced to 16 analog channels of the microcontroller and the remaining pins
are connected to ground of the evaluation board.
DS41385F-page 52
© 2009-2012 Microchip Technology Inc.
Evaluation Board Hardware
4.2.3
PIC24H CVD Evaluation Board
Figure 4-9 identifies the key hardware components for the PIC24H CVD Evaluation
Board. There is one evaluation board and four plug-in daughter boards. The four
plug-in daughter boards are identified as direct keys, matrix keys, 2-channel slider and
4-channel slider.
FIGURE 4-9:
PIC24H CVD EVALUATION BOARD COMPONENT LAYOUT (TOP SIDE)
5
2
1
6
4
3
7
TABLE 4-3:
BOARD COMPONENTS
Reference
Component
1
2
3
4
PIC24HJ128GP506A microcontroller (U1) for the PIC24H CVD Evaluation Board
USB mini-B receptacle (J5)
ICSP™ Programming header (J1)
Power supply (Q1) to provide the VDD to the evaluation board
5
6
7
Plug-in sensor LEDs (D1-D16)
Plug-in interface connector (J4/J3)
PICkit™ Serial Analyzer connector (J2)
© 2009-2012 Microchip Technology Inc.
DS41385F-page 53
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
4.2.3.1
COMPONENT DESCRIPTIONS
The components listed here (in order of their reference tags in Figure 4-9) are the key
components of the application side of the PIC24H CVD Evaluation Board:
1. PIC24HJ128GP506A Microcontroller (U1): This provides the processing
power for the touch sense applications in the PIC24H Evaluation Board.
2. USB mini-B Receptacle (J5): This provides power to the board via USB.
3. ICSP™ Programming Header (J1): This provides a standard Microchip ICD
interface for programming and debugging applications on an evaluation board. It
is designed to connect directly with Microchip's PICkit 3, REAL ICE™ or ICD 3.
Pin 1 is located on the right side of the interface, as viewed from the front of the
board, and is marked with an arrow.
4. PICkit Serial Analyzer Connector (J2): This connector is used to exchange
data to the Host PC through I2C using the PICkit Serial Analyzer.
5. Power Supply (Q1): This converts the +5 VDC from VBUS to the regulated+3.3
VDC required by the evaluation board.
6. Plug-in Sensor LEDs (D1-D16): Sixteen LEDs (D1 through D16) are connected
to one general purpose I/O ports of the PIC microcontroller. These LEDs are
illuminated based on the need of the application.
7. Plug-in Interface Connector (J4/J3): This is a 48-pin connector, which is used
to interface the different plug-in boards to the microcontroller. This connector is
interfaced to 16 analog channels of the microcontroller and the remaining pins
are connected to ground of the evaluation board.
DS41385F-page 54
© 2009-2012 Microchip Technology Inc.
Evaluation Board Hardware
4.3
INTERFACING TO THE EVALUATION BOARDS
4.3.1
PIC16F CVD and PIC24H CVD Evaluation Boards with I2C
Communication
To interface the plug-in boards to the evaluation boards in the Enhanced mTouch
Capacitive Evaluation Kit:
1. Connect the evaluation board to the MPLAB ICD programmer interface through
the ICSP connector, J1.
2. Connect the USB receptacle from the workstation to connector J5 of the
evaluation board. This is also used to power-up the evaluation board.
3. Connect the PICkit serial analyzer to the evaluation board through the J6
connector.
CAUTION
Do not use the PICkit Serial Analyzer to power the PIC24H CVD Evaluation Board.
4. Connect any of the four plug-in boards to the evaluation board through the J4/J3
connector.
5. After the hardware connections are done, open the working project in MPLAB
IDE and make the required changes for the corresponding plug-in board, which
are explained in the Readme.txt files included in the project folder. However,
the default values of the channel settings of the corresponding header files are
mentioned in Section 2.2 “Individual Touch Sense Demonstrations”. The
default settings of the configured channels are also explained in the
Readme.txt file.
6. Download the hex file into the evaluation board using the MPLAB ICD 3, PICkit
3, or REAL ICE programming interface.
7. Check that the respective plug-in boards are working and view their output
through the 16 LEDs on the evaluation board.
FIGURE 4-10:
EVALUATION BOARD BLOCK DIAGRAM (PIC16F AND PIC24H ONLY)
ICSP™
J1
Plug-in
Boards
J4/J3
Connector
MPLAB® ICD 3
REAL ICE™
In-circuit
Emulator
USB
Cable
Evaluation
Board
Workstation
J6
SIP
Connector
PICkit™ Serial
Analyzer
USB
Cable
A to mini-B USB Cable(1)
J5
Note 1:
USB connection between an evaluation board and a workstation is used for power purposes only
cannot be used for USB communication.
Note:
The number of plug-in boards that can be interfaced with the evaluation
board simultaneously is limited by the number of channels in the evaluation
board. Please refer to the specific evaluation board schematic in Appendix
A. “Evaluation Board Schematics” to verify the number of channels
available.
© 2009-2012 Microchip Technology Inc.
DS41385F-page 55
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
4.3.2
PIC18F CTMU, PIC24F CTMU, and PIC32 CVD Evaluation
Boards with USB Communications
To interface the plug-in boards to the evaluation boards in the Enhanced mTouch
Capacitive Evaluation Kit:
1. Connect the evaluation board to the MPLAB ICD programmer interface through
the ICSP connector, J1.
2. Connect the USB receptacle from the workstation to connector J5 of the
evaluation board. This is also used to power-up the evaluation board. For the
CTMU boards, it is also used to interface to the PC.
3. Connect any of the four plug-in boards to the evaluation board through the J4/J3
connector (48-pin).
4. After the hardware connections are done, open the working project in the MPLAB
IDE and make the required changes for the corresponding plug-in board, which
are explained in the Readme.txt file. However, the default values of the
channel settings of the corresponding header files are mentioned in
Section 2.2 “Individual Touch Sense Demonstrations”. The default settings
of the configured channels are also explained in the Readme.txt file.
5. Download the hex file into the evaluation board using the MPLAB ICD 3 interface.
6. Check that the respective plug-in boards are working and view their output
through the 16 LEDs on the evaluation board.
FIGURE 4-11:
EVALUATION BOARD BLOCK DIAGRAM (PIC18F, PIC24F and PIC32 ONLY)
ICSP™
J1
Plug-in
Boards
J4/J3
Connector
Evaluation
Board
Note:
DS41385F-page 56
ICD 3
REAL ICE™
In-circuit
Emulator
Cable
Workstation
A to mini-B USB Cable
J5
J2
USB
MPLAB®
UART
Transmit/
Receive
PICkit™
Serial
Analyzer
USB
Cable
The number of plug-in boards that can be interfaced with the evaluation
board simultaneously is limited by the number of channels in the evaluation
board. In the case of the PIC24F CTMU Evaluation Board, the ICD interface
(PGD and PGC) shares two of the input channels of the connector, J4/J3
(channel 6 and channel 7), the operation might fail if any of the plug-in
boards is connected to these two channels when the Debugger mode is
enabled in the MPLAB IDE.
© 2009-2012 Microchip Technology Inc.
ENHANCED mTouch™ CAPACITIVE
TOUCH EVALUATION KIT AND
ACCESSORY BOARDS USER’S GUIDE
Chapter 5. Troubleshooting
This chapter discusses common operational issues and methods to resolve them.
5.1
COMMON ISSUES
Issue 1: The evaluation board does not respond to inputs (i.e., no lights when
a key plug-in or touch sensor is touched).
Solution: Check the evaluation board for power as follows:
• Verify that USB power (VUSB, +5 VDC) is present on the USB connection
• If the evaluation board is connected to a computer through a USB hub,
verify that the hub is powered and capable of providing power to
downstream devices
• If the evaluation board is directly connected to a computer, verify that the
USB port used is active or try switching to another port
Issue 2: The touch sensors are abnormally sensitive or insensitive (generally
insensitive) to inputs.
Solution: Check to make sure that the plug-in daughter boards are connected to the
channels that are mentioned in the Readme.txt file.
Check the bar graph settings for the sensors in the mTouch Sensing Solution
software. The evaluation board’s trip point and other settings may have been
changed to values that interfere with the default operation. Do the following
to correct this issue:
• In the Settings dialog, verify that the Use Firmware Settings option is
selected
• If the Use Saved Value option is selected instead, change the trip point
values for each affected channel to a value that produces an appropriate
response
Issue 3: The evaluation board and the mTouch Sensing Solution diagnostic
tool are installed and operating properly, but are not communicating
with each other.
Solution: The most prevalent problem is when the UART correctly transmits data but
the GUI does not see any data. To resolve this issue, ensure that the GUI is
using the correct COM port. It is recommended that a terminal application,
such as RealTerm be used (available from http://realterm.sourceforge.net/).
This application allows you to not only identify which COM port the PICkit
Serial Analyzer is using, but it also allows you to check the integrity of the
data being received.
Be sure the red LED, labeled BUSY on the PICkit Serial Analyzer, is
illuminated once your mTouch application is up and running after the initial
LED display. If this does not occur, press the reset button on the PICkit Serial
Analyzer until all of the LEDs are illuminated. The BUSY LED should then
indicate that the PICkit Serial Analyzer is receiving data.
© 2009-2012 Microchip Technology Inc.
DS41385F-page 57
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
More often than not, when the GUI is not seeing any data, there is actually
no data to be seen. In other words, while there is a COM 8 or COM 15 port
attached to the PICkit Serial Analyzer and the GUI is attached to the correct
COM port, nothing is getting up the USB cable from the PICkit Serial
Analyzer to the GUI, in spite of the fact that the BUSY LED on the PICkit
Serial Analyzer is illuminated. In this case, the only recourse is to reboot the
PC so that the USB driver for the PICkit Serial Analyzer is reinstalled.
If the problem exists with a new mTouch application, you may want to try out
an existing application that is known to work. If you are using a new board,
try verifying the UART to GUI interface using a Microchip Enhanced mTouch
Capacitive Touch evaluation board to verify that the PICkit Serial Analyzer
and the GUI are working correctly before returning to debugging the
interface on your new board.
Issue 4: The board’s edge connector will add some additional parasitic
capacitance to the system.
Solution: Be sure to factor in this additional parasitic capacitance when using an
evaluation board.
Issue 5: Touching the solder connections can create a very strong coupling to
the sensor and trigger buttons.
Solution: Avoid making contact with the solder connections.
DS41385F-page 58
© 2009-2012 Microchip Technology Inc.
ENHANCED mTouch™ CAPACITIVE
TOUCH EVALUATION KIT AND
ACCESSORY BOARDS USER’S GUIDE
Appendix A. Evaluation Board Schematics
This appendix includes the following schematics:
•
•
•
•
•
•
Figure A-1: “mTouch™ – PIC16F CVD Evaluation Board Schematic”
Figure A-2: “mTouch™ – PIC18F CTMU Evaluation Board Schematic”
Figure A-3: “mTouch™ – PIC24F CTMU Evaluation Board Schematic”
Figure A-4: “mTouch™ – PIC24H CVD Evaluation Board Schematic”
Figure A-5: “mTouch™ – PIC32 CVD Evaluation Board Schematic”
Figure A-6: “mTouch™ – PIC32 CTMU Evaluation Board Schematic”
© 2009-2012 Microchip Technology Inc.
DS41385F-page 59
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
mTouch™ – PIC16F CVD EVALUATION BOARD SCHEMATIC
PICkit™ 2
PICkit™ Serial
FIGURE A-1:
DS41385F-page 60
© 2009-2012 Microchip Technology Inc.
Evaluation Board Schematics
FIGURE A-2:
J3:L
J3:K
J3:I
J3:H
J3:A
J3:D
J3:G
J3:J
23
24
21
22
17
18
15
16
mTouch™ – PIC18F CTMU EVALUATION BOARD SCHEMATIC
BTN_9
RD5
RD4
BTN_8
RD0
RD6
RD7
1K
R19
D2
D1
D3
D4
Green
BTN_10
BTN_11
1
2
7
8
13
14
19
20
RD1
1K
R20
D6
D5
D7
D8
Yellow
RD2
1K
R21
D10
D9
D11
D12
Orange
RD3
1K
R22
D14
D13
D15
D16
Red
BTN_12
VDD
BTN_2
BTN_3
C1
BTN_12
BTN_10
0.1
BTN_8
J4:B
J4:A
J4:D
J4:G
J4:J
3
4
BTN_7
1
2
7
8
13
14
19
20
100
MCLR
BTN_1
1 R17
2
+5V
3
4
5
6
VDD
RC1
VDD
BTN_7
BTN_6
VDD
1
3
5
7
9
11
C7
RC0
RC1
RC6
RC7
VBUS R23
R26
C4
C4
4.7uF
0.1
DD+
6
22pf
C9
6.8uF
0.1
J5
1
VBUS
2
DUSB
3
D+
4
5
Shield
C11
22pf
0.1
BTN_4
R18
10K
MCLR
Y1
8 MHz
C10
C8
BTN_5
VDD
Program
VBUS
J2
R24
4.7K
2
4
6
8
10
12
R25
4.7K
VDD
VDD
PGD
PGC
RF5
RF4
56K
100K
D17
VBUS
MBR0520L
TP1
+5V
C13
0.1
Note:
RC0
BTN_3
J1
BTN_5
BTN_6
BTN_2
J4:C
33
32
31
30
29
28
27
26
25
24
23
BTN_4
PGD
J4:E
11
12
9
10
5
6
U1
PIC18F4XJ50
N/C
RC0
OSC2
OSC1
VSS
VDD
RE2
RE1
RE0
RA5
VCAP
12
13
14
15
16
17
18
19
20
21
22
J4:F
RC7RX/DT
RD4/SPP4
RD5/SPP5
RD6/SPP6
RD7SPP7
VSS
VDD
RB0
RB1
RB2
RB3
N/C
N/C
RB4
RB5
RB6
RB7
MCLR
RA0
RA1
RA2
RA3
BTN_9
1
2
3
4
5
6
7
8
9
10
11
BTN_0
J4:H
15
16
RC7
RD4
RD5
RD6
RD7
BTN_1
PGC
J4:I
BTN_0
RB5
J4:K
23
24
21
22
17
18
RB4
J4:L
RC6
RC5/D+
RC4/DNC
RD3/SPP3
RD2/SPP2
RD1/SPP1
RD0/SPP0
VUSB
RC2
RC1
N/C
44
43
42
41
40
39
38
37
36
35
34
BTN_11
C3
0.1
RD3
RD2
RD1
RD0
J3:C
J3:B
2
7
8
13
14
19
20
RC6
D+
D-
J3:F
J3:E
MCP1702T–3302E/CB
Q1
2
3
IN
OUT
GND
1
TP2
VDD
C18
C12
1 UF
0.1
TP3
The Channels 13,14 and 15 are not used, and are grounded in the PIC18F CTMU Evaluation Board.
© 2009-2012 Microchip Technology Inc.
DS41385F-page 61
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
mTouch™ – PIC24F CTMU EVALUATION BOARD SCHEMATIC
VCAP
10 MF
MCP1702T-3302E/CB
10 MF
PIC24FJ128GB106I/PT
10 MF
22 pF
22 pF
FIGURE A-3:
DS41385F-page 62
© 2009-2012 Microchip Technology Inc.
J4:J
J4:G
J4:D
J4:A
J4:B
J4:C
J4:E
J4:F
J4:H
J4:I
J4:K
J4:L
J3:B
J3:C
J3:E
J3:F
J3:J
J3:G
J3:D
J3:A
J3:H
J3:I
20
19
14
13
8
7
2
1
4
3
6
5
10
9
12
11
16
15
18
17
22
21
24
23
4
3
6
5
10
9
12
11
20
19
14
13
8
7
2
1
16
15
18
17
22
PGD
PGC
BTN_5
BTN_4
BTN_3
BTN_2
BTN_1
BTN_0
BTN_15
BTN_14
BTN_13
BTN_12
BTN_11
BTN_10
BTN_9
+5V
Red
D16
D15
D14
D13
Orange
D12
D11
D10
D9
Yellow
D8
D7
D6
D5
Green
D4
D3
C4
10uF
R16
R15
R14
R13
R12
R11
R10
R9
R8
R7
R6
R5
R4
R3
R2
1K
1K
1K
1K
1K
1K
1K
1K
1K
1K
1K
1K
1K
1K
1K
0.1
C5
RE7
RE6
RE5
RE4
RE3
RE2
RE1
RE0
RD7
RD6
RD5
RD4
RD3
RD2
RD1
RD0
5
4
3
2
1
J5
6
Shield
D+
D-
VBUS
6
5
4
3
2
1
J6
6
5
4
3
2
1
Program
J1
0.1
C7
R18
10K
USB
PICkit Serial
MCLR
VDD
TP1
VDD
0.1
C13
100
RE7
RE6
RE5
VDD
R17
+5V
RX
SCL
SDA
TX
VDD
BTN_0
BTN_1
BTN_2
BTN_3
BTN_4
BTN_5
0.1
C1
3
IN
1
GND
OUT
RE2
2
0.1
C15
0.1
C6
RE1
10uF
C18
VDD
MCP1702T-3302E/CB
MCLR
RE4
PGC
21
RE3
PGD
J3:K
RE0
RD7
VDD
RF0
0.1
C12
VDD
VDD
PIC24H128GP506
TP2
BTN_8
1K
RF1
BTN_9
© 2009-2012 Microchip Technology Inc.
BTN_10
C9
10uF
0.1
C3
TP3
RF4
RF1
TX
RX
SDA
SCL
RD9
RD10
RD11
RD0
RF0
VDD
11
9
7
5
3
1
0.1
C2
J2
12
10
8
6
4
2
RF5
RD9
RD10
RD11
VDD
VDD
20pf
C10
Y1
8MHz
C11
20pf
FIGURE A-4:
BTN_11
R1
RD6
BTN_12
D2
RD5
BTN_13
D1
RD4
BTN_14
BTN_8
RD3
BTN_15
24
RD2
RF4
23
RD1
RF5
J3:L
Evaluation Board Schematics
mTouch™ – PIC24H CVD EVALUATION BOARD SCHEMATIC
DS41385F-page 63
J4:J
J4:G
J4:D
J4:A
J4:B
J4:C
J4:E
J4:F
J4:H
J4:I
J4:K
J4:L
J3:B
J3:C
J3:E
J3:F
J3:J
J3:G
J3:D
J3:A
J3:H
20
19
14
13
8
7
2
1
4
3
6
5
10
9
12
11
16
15
18
17
22
21
24
23
4
3
6
5
10
PGD
PGC
BTN_5
BTN_4
BTN_3
BTN_2
BTN_1
BTN_0
BTN_15
BTN_14
BTN_13
+5V
C4
10uF
Red
0.1
C5
D16
D15
D14
D13
Orange
D12
D11
D10
D9
Yellow
D8
D7
D6
9
12
11
Green
D4
D3
D5
BTN_12
BTN_11
20
19
14
13
8
7
2
1
16
15
D2
D1
R1
D+
D-
R16
R15
R14
R13
R12
R11
R10
R9
R8
R7
R6
R5
R4
R3
R2
5
4
3
2
1
1K
1K
1K
1K
1K
1K
1K
1K
1K
1K
1K
1K
1K
1K
1K
1K
6
Shield
D+
D-
VBUS
J5
RE7
RE6
RE5
RE4
RE3
RE2
RE1
RE0
RD7
RD6
RD5
RD4
RD3
RD2
RD1
RD0
USB
MCLR
6
5
4
3
2
1
+5V
0.1
C7
R17
BTN_0
BTN_1
BTN_2
BTN_3
BTN_4
BTN_5
0.1
C13
VDD
TP1
R18
10K
Program
J1
VDD
0.1
C1
3
MCLR
IN
1
GND
OUT
MCP1702T-3302E/CB
100
RE7
RE6
RE5
VDD
2
10uF
C18
VDD
RE2
TP2
RE4
PGC
BTN_10
RE3
PGD
18
RE0
RE1
0.1
C6
BTN_8
J3:I
VCAP
C9
10uF
VDD
0.1
C12
TP3
VDD
U1
PIC32MX795F512H
RF1
BTN_9
BTN_9
RF0
BTN_10
17
RD7
22
0.1
C15
0.1
C3
RD6
BTN_8
RD5
BTN_12
21
RD4
BTN_13
24
RD3
BTN_14
23
RD2
RF4
J3:L
VDD
BTN_11
RF4
RF3
RF1
RF0
D-
D+
RD9
RD10
RD11
RD0
RF3
VDD
C2
+5V
4
11
9
7
12
10
8
6
2
5
3
J2
VDD
1
0.1
C14
0.1
C8
0.1
RF5
RD9
RD10
RD11
VDD
VDD
20pf
C10
Y1
8MHz
C11
20pf
FIGURE A-5:
RD1
RF5
DS41385F-page 64
BTN_15
J3:K
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
mTouch™ – PIC32 CVD EVALUATION BOARD SCHEMATIC
© 2009-2012 Microchip Technology Inc.
J4:J
J4:G
J4:D
J4:A
J4:B
J4:C
J4:E
J4:F
J4:H
J4:I
J4:K
J4:L
J3:B
J3:C
J3:E
J3:F
J3:J
J3:G
J3:D
J3:A
J3:H
J3:I
J3:K
0.1
C5
100
D+
D-
+5V
MCLR
1K
1K
1K
1
5
4
3
2
D+
D-
0.1
C13
J5
VBUS
TP1
D13
D9
D5
6
4.7uF
C4
PGC
PGD
VDD
R17
R22
R21
R20
20
+5V
6
5
4
3
2
1
Program
J1
LED4
LED3
LED2
D1
Shield
BTN_7
BTN_6
BTN_5
BTN_4
BTN_3
BTN_2
BTN_1
BTN_0
BTN_15
BTN_14
BTN_13
CH NOT USED
BTN_12
CH NOT USED
BTN_11
BTN_10
BTN_9
19
14
13
8
7
2
1
4
3
6
5
10
9
12
11
16
15
18
17
22
21
24
23
4
3
6
5
10
9
12
11
20
19
14
13
8
7
2
1
16
15
18
17
22
21
LED6
USB
3
D15
D11
D7
D3
IN
1
GND
OUT
MCP1702T-3302E/CB
D14
D10
D6
D2
LED7
2
1uF
C18
LED8
VDD
TP2
10uF
C1
D16
D12
D8
D4
0.1
C12
VDD
6.8uF
C9
Red
Orange
Yellow
Green
BTN_9
VDD
D-
D+
LED5
LED4
LED3
LED2
LED1
TP3
0.1
C14
VDD
VCAP
MCLR
LED6
RA10
LED5
LED7
RA7
1K
C3
0.1
+5V
BTN_8
R19
RC4
RC5
PIC32MX220F032D
LED8
VDD
BTN_7
LED1
GND
0.1
C7
R18
10K
VDD
© 2009-2012 Microchip Technology Inc.
BTN_0
BTN_8
RA9
24
BTN_10
BTN_1
23
RA4
PGD
RA8
RB4
RA4
RA9
RC4
RC5
8
10
12
11
6
5
9
4
3
7
2
1
J2
BTN_2
BTN_3
BTN_4
BTN_5
BTN_6
RA8
RB4
VDD
C8
0.1
22pf
C10
Y1
C11
22pf
RA7
RA10
PGC
PGD
VDD
VDD
8MHz
FIGURE A-6:
PGC
J3:L
Evaluation Board Schematics
mTouch™ – PIC32 CTMU EVALUATION BOARD SCHEMATIC
DS41385F-page 65
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
NOTES:
DS41385F-page 66
© 2009-2012 Microchip Technology Inc.
ENHANCED mTouch™ CAPACITIVE
TOUCH EVALUATION KIT AND
ACCESSORY BOARDS USER’S GUIDE
Appendix B. Adding Features to a ProfiLab-Expert™ GUI
If you purchase ProfiLab-Expert™ you can add new features to the mTouch GUI. As
an example, to support a new button or display panel for your customer, you can
mock-up a prototype of the new panel in the GUI, much like what is already shown in
the last window of each existing GUI.
If you open up the .prj project in ProfiLab-Expert, you will see the same basic structure in all of the example GUIs (see Figure B-1). The UART text string is cut apart, with
commas separating each field. Then, the separate fields are processed, with the button
voltages going to real-time plots on the first through third windows. The minimum and
maximum voltage for each channel is calculated and displayed in the same window as
the voltage plots. A virtual front panel is also built using these measurements and displayed in the last window. UART data and button voltages are also processed and
dumped to ASCII text files when text dumps are initiated by buttons on windows two
through four.
FIGURE B-1:
GUI PROJECT STRUCTURE
Parsing comma-delimited
UART text string
Plotting Button Voltages
Saving Button Voltages
to text files
Virtual front panel on
first GUI tab
Min/Max displayed on
Button Voltage plots
© 2009-2012 Microchip Technology Inc.
DS41385F-page 67
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
The details of parsing the UART text string of comma-delimited five-digit integers are
shown in Figure B-2.
FIGURE B-2:
PARSING THE UART TEXT STRING
Voltages
This block decodes the comma-delimited UART string into status and voltages.
Voltage holds for plots
DS41385F-page 68
© 2009-2012 Microchip Technology Inc.
Adding Features to a ProfiLab-Expert™ GUI
Four channels of ADC counts are normalized and plotted in this part of the project, as
shown in Figure B-3.
FIGURE B-3:
PLOT DETAILS
Virtual front panel on first GUI tab
PlotScale macro scales the ADC
counts into normalized voltage.
Min/Max displayed on Button Voltage plots
As a suggestion, start with the GUIs provided and slowly and carefully add the new
features you need. If you stop after each small step and test the GUI, you can easily
revert to a prior working version once a bug appears. Attempts to make large scale
modifications to the GUI’s structure all at once greatly increase the chances that the
new GUI will not work, making debugging difficult. Fortunately, most of the work has
already been completed in the GUI provided in the MPLAB projects, which provides
you with a good starting point for creating your own custom features.
B.1
mTouch APPLICATION SUPPORT
B.1.1 Data Dump Format
Each mTouch application formats a string of comma-delimited five-digit non-negative
numbers, and then outputs the text string using the UART module. The following is an
example line of data taken from a Direct Key project:
00000,00128,00000,29687,18443,32159,30447,34727,34367,34783,32427
The first field shows whether any buttons are being pressed using a bit map where the
Least Significant bit (LSb) corresponds to the first button. Therefore, this field can
range from 00000 to 00255 for an 8-button sensor daughter board.
The second field shows whether a button has been asserted. This field is latched and
will not change until another button is asserted. The example above shows that button
7 (128 = 27) has been asserted.
© 2009-2012 Microchip Technology Inc.
DS41385F-page 69
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
The third field reports the current slider value, with 00255 equal to full scale. Depending
on the mTouch example being used, slider values are calculated using the 2, 4, or 8
buttons available. However, it is important to note that slider values are not available
on the 12-key matrix sensor board, since this board uses a 3x4 button array that does
not support a slider.
The remaining fields, beginning with 29687, are the normalized ADC counts measuring
the button voltages for all eight buttons, starting with the first button.
The first channel screen (see Figure 3-12), supports changing the numerical value that
represents full scale in ADC counts. By default, this value is 65,535, but it can be
changed if ADC scaling changes in the mTouch application. Also seen in Figure 3-12
are buttons to START/STOP data dumps to an ASCII file. These buttons are provided
to dump screen voltages or to dump all of the data that the mTouch application outputs
through the UART transmit (TX) pin.
B.1.2 Supporting Application Code
Example B-1 provides a portion of PIC24H code that can be used to format and
transmit data to ProfiLab-Expert.
EXAMPLE B-1:
sprintf(ButtonMeasString,
"%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d"
"\r\n",
CurrentButtonStatus, CurrentButtonAsserts, SliderValue,
CurrentButtonMeasurements[0],
CurrentButtonMeasurements[1],
CurrentButtonMeasurements[2],
CurrentButtonMeasurements[3],
CurrentButtonMeasurements[4],
CurrentButtonMeasurements[5],
CurrentButtonMeasurements[6],
CurrentButtonMeasurements[7]);
while(BusyUART2());
putsUART2((unsigned int *)ButtonMeasString);
Example B-2 provides a portion of PIC32 code that can be used to format and transmit
data to ProfiLab-Expert.
EXAMPLE B-2:
sprintf(ButtonMeasString,
%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d"
"\r\n",
CurrentButtonStatus, CurrentButtonAsserts, SliderValue,
CurrentButtonMeasurements[0],
CurrentButtonMeasurements[1],
CurrentButtonMeasurements[2],
CurrentButtonMeasurements[3],
CurrentButtonMeasurements[4],
CurrentButtonMeasurements[5],
CurrentButtonMeasurements[6],
CurrentButtonMeasurements[7]);
SendDataBuffer(ButtonMeasString, strlen(ButtonMeasString) );
DS41385F-page 70
© 2009-2012 Microchip Technology Inc.
Adding Features to a ProfiLab-Expert™ GUI
B.1.3 Modifying mTouch Application Code
ProfiLab-Expert supports a UART data stream of up to 16 fields. The first three fields
are used for status (button status, button asserts, and slider). The remaining thirteen
fields are available for any other data of interest. Twelve fields are displayed on
real-time plots of the first through third tabbed screens of the GUI. The last (sixteenth)
field can be used to identify special output records that should not be plotted by the
GUI, but can be captured and dumped to an ASCII text file using the All Data Logger
buttons on the first screen. If the sixteenth value in the string is non-zero, the GUI will
not plot the data record on the voltage plots.
In many mTouch applications, 32 raw ADC measurements are averaged to produce the
button voltage used by the detection algorithms and reported to the mTouch GUI.
Example B-3 shows a portion of code that uses this special record feature to output the
raw voltage measurements.
EXAMPLE B-3:
#
#
if defined( UART_DUMP_RAW_COUNTS )
for ( iHF_Read = 0; iHF_Read <
32; iHF_Read++ )
{
sprintf(ButtonMeasString,
"%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d,"
"%05d\r\n",
CurrentButtonStatus, CurrentButtonAsserts, SliderValue,
CurRawData[iHF_Read][0], CurRawData[iHF_Read][1],
CurRawData[iHF_Read][2], CurRawData[iHF_Read][3],
CurRawData[iHF_Read][4], CurRawData[iHF_Read][5],
CurRawData[iHF_Read][6], CurRawData[iHF_Read][7],
0,0,0,0,
iHF_Read+1);
SendDataBuffer(ButtonMeasString, strlen(ButtonMeasString) );
}
endif
The mTouch software for the PIC24H and PIC32 families supports adaptive button
detection, in which the current filtered button measurements are compared against
long term averages. Sometimes it is useful to look at both the current button
measurement and long term average on the same plot. Example B-4 shows a portion
of code that formats the output text to look at both for the first six buttons.
EXAMPLE B-4:
sprintf( ButtonMeasString,
"%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d"
"\r\n",
CurrentButtonStatus, CurrentButtonAsserts, SliderValue,
CurrentButtonMeasurements[0],CurrentAveragedMeasurements[0],
CurrentButtonMeasurements[1],CurrentAveragedMeasurements[1],
CurrentButtonMeasurements[2],CurrentAveragedMeasurements[2],
CurrentButtonMeasurements[3],CurrentAveragedMeasurements[3],
CurrentButtonMeasurements[4],CurrentAveragedMeasurements[4],
CurrentButtonMeasurements[5],CurrentAveragedMeasurements[5]);
© 2009-2012 Microchip Technology Inc.
DS41385F-page 71
Enhanced mTouch™ Capacitive Touch Evaluation Kit and Accessory Boards User’s Guide
NOTES:
DS41385F-page 72
© 2009-2012 Microchip Technology Inc.
ENHANCED mTOUCH™ CAPACITIVE
TOUCH EVALUATION KIT AND
ACCESSORY BOARDS USER’S GUIDE
Index
B
K
Block Diagrams
CVD Evaluation Layout (Top) ........................... 49
PIC16F CVD Evaluation Board
Application Side.............................43, 46
PIC18F CTMU Evaluation Board
Application Side.................................. 48
PIC24F CTMU Evaluation Board
Application Side.............................45, 47
PIC32 CTMU Evaluation Board
Application Side.................................. 48
Board Components .......................................49, 51, 53
Board H/W ............................................................... 43
Board Setup ............................................................. 17
Connecting the H/W.......................................... 17
Installing the S/W .............................................. 17
Interfacing the Plug-in Boards .......................... 56
Kit Contents.............................................................. 14
C
R
Charge Time Measurement Unit (CTMU) ................ 45
Components
External Plug-in Components ........................... 52
ICSP Programming Header .............................. 52
PIC18F46J50 Microcontroller ........................... 52
PIC24FJ128GB106 Microcontroller .................. 52
PIC32MX220F032D Microcontroller ................. 52
PIC32MX795F512H Microcontroller ................. 52
Plug-in Interface Connector .............................. 52
Plug-in Sensor LEDs ........................................ 52
Power Supply.................................................... 52
USB mini-B Receptacle .................................... 52
Configuration Settings
Readme ............................................................ 22
Customer Notification Service.................................. 10
Customer Support .................................................... 10
Readme
Configuration Settings....................................... 22
Recommended Reading ............................................ 7
D
Demonstration Application ....................................... 19
Direct Key Plug-in .................................................... 21
Documentation
Conventions ........................................................ 6
Layout ................................................................. 5
E
Evaluation Board
CTMU and CVD Component Layout (Top Side)51
H
Host Computer Requirements.................................. 17
M
Matrix Key Plug-in .................................................... 22
Microchip Internet Web Site ..................................... 10
O
Operational Requirements ....................................... 17
P
PIC16F1937 Microcontroller .............................. 43, 46
PIC18F46J50 Microcontroller............................. 44, 48
PIC24FJ128GB106 Microcontroller ......................... 45
PIC32 CTMU Capacitive Touch Evaluation Board... 16
PIC32MX795F512H Microcontroller ........................ 51
Plug in Power ........................................................... 23
Plug in the Sensors .................................................. 23
S
Schematics
PIC16F CVD Evaluation Board......................... 60
PIC18F CTMU Evaluation Board ...................... 61
PIC24F CTMU Evaluation Board ...................... 62
PIC24H CVD Evaluation Board ........................ 63
PIC32 CTMU Evaluation Board ........................ 65
PIC32 CVD Evaluation Board ........................... 64
Slider Plug-in............................................................ 22
T
Touch Interface ........................................................ 19
Touch Sense Demonstrations.................................. 21
12-Key Matrix Plug-in Board ............................. 22
2-Channel Slider Plug-in Board ........................ 22
4-Channel Slider Plug-in ................................... 22
8-Key Direct Plug-in Board ............................... 21
Troubleshooting ....................................................... 57
U
Using the ProfiLab-Expert™ Graphical User Interface
for Real-Time Debugging ..................................... 25
W
Warranty Registration ................................................ 7
WWW Address......................................................... 10
I
Initial Board Setup.................................................... 17
Internet Address....................................................... 10
© 2009-2012 Microchip Technology Inc.
DS41385F-page 73
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