MPLAB Starter Kit for
dsPIC® Digital Signal Controllers
User’s Guide
© 2010 Microchip Technology Inc.
DS51700B
Note the following details of the code protection feature on Microchip devices:
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Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
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Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
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Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
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Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,
PIC32 logo, rfPIC and UNI/O are registered trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,
MXDEV, MXLAB, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip
Technology Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial
Programming, ICSP, Mindi, MiWi, MPASM, MPLAB Certified
logo, MPLIB, MPLINK, mTouch, Octopus, Omniscient Code
Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit,
PICtail, REAL ICE, rfLAB, Select Mode, Total Endurance,
TSHARC, UniWinDriver, WiperLock and ZENA are
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2010, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
ISBN: 978-1-60932-202-1
Microchip received ISO/TS-16949:2002 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.
DS51700B-page 2
© 2010 Microchip Technology Inc.
MPLAB STARTER KIT FOR
dsPIC® DIGITAL SIGNAL CONTROLLERS
USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 5
Chapter 1. Introduction
1.1 Overview ...................................................................................................... 11
1.2 Operational Requirements ........................................................................... 12
1.3 Board Setup ................................................................................................. 12
Chapter 2. Speech Record and Playback Demo
2.1 Running the Demo ....................................................................................... 13
2.2 Understanding the Demo ............................................................................. 14
2.3 Examining Demo Software Flow .................................................................. 15
2.4 Other Demo Code Examples ....................................................................... 18
Chapter 3. Develop an Application
3.1 Installing the Hardware and Software .......................................................... 19
3.2 Setting Up an Example Application for Debug ............................................. 20
3.3 Running the Example Application ................................................................ 21
3.4 Debugging the Example Application ............................................................ 21
3.5 Programming the Debugged Application ...................................................... 24
3.6 Creating Other dsPIC DSC Applications ...................................................... 24
3.7 Determining Device Support and Reserved Resources ............................... 24
3.8 Troubleshooting ............................................................................................ 25
3.9 Settings Dialog Info Tab ............................................................................... 25
Chapter 4. Hardware
4.1 Audio Functional Overview ........................................................................... 27
4.2 Debug Functional Overview ......................................................................... 29
4.3 Board Components ...................................................................................... 30
Appendix A. Schematics
Figure A-1: Debug Input and Control Schematic – Part 1 .................................. 36
Figure A-2: Debug Input and Control Schematic – Part 2 .................................. 37
Figure A-3: USB Interface/Target Power Switching Schematic ......................... 38
Figure A-4: Speech Processing Schematic ........................................................ 39
Figure A-5: Flash Memory Schematic ................................................................ 40
Figure A-6: Output Compare Module PWM Filters Schematic ........................... 41
Figure A-7: Audio Codec Schematic .................................................................. 42
Figure A-8: Audio Input Schematic ..................................................................... 43
Figure A-9: Audio Output Schematic .................................................................. 44
Figure A-10: User LEDs, User Switches and Temp Sensor Schematics ........... 45
© 2010 Microchip Technology Inc.
DS51700B-page 3
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
Index .............................................................................................................................47
Worldwide Sales and Service .....................................................................................48
DS51700B-page 4
© 2010 Microchip Technology Inc.
MPLAB STARTER KIT FOR
dsPIC® DIGITAL SIGNAL CONTROLLERS
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 preface contains general information that will be useful to know before you use the
MPLAB Starter Kit for dsPIC® Digital Signal Controllers. 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 starter kit as a development and
demonstrative tool for the speech and audio processing capabilities of dsPIC33F family
devices. The manual layout is as follows:
• Chapter 1. Introduction – This chapter introduces the starter kit and provides an
overview of its features.
• Chapter 2. Speech Record and Playback Demo – This chapter describes a
simple program that demonstrates how to use the starter kit for speech capture
and playback.
• Chapter 3. Develop an Application – This chapter describes how to debug
application software on the starter kit using MPLAB® IDE.
• Chapter 4. Hardware – This chapter provides a functional overview of the starter
kit and identifies the major hardware components.
• Appendix A. Schematics – This appendix provides detailed schematic diagrams
of the starter kit.
© 2010 Microchip Technology Inc.
DS51700B-page 5
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
Represents
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 number in verilog format,
where N is the total number of
digits, R is the radix and n is a
digit.
A key on the keyboard
Click OK
Click the Power tab
4‘b0010, 2‘hF1
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
N‘Rnnnn
Text in angle brackets < >
Courier New font:
Plain Courier New
Represents code supplied by
user
DS51700B-page 6
Examples
File>Save
Press <Enter>, <F1>
var_name [,
var_name...]
void main (void)
{ ...
}
© 2010 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 MPLAB Starter Kit for dsPIC® Digital Signal
Controllers (DSCs). Other useful documents are listed below. The following Microchip
documents are available and recommended as supplemental reference resources.
Readme Files
For the latest information on using other tools, read the tool-specific Readme files in
the Readmes 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.
dsPIC33F DSC Documentation
For the most up-to-date information on dsPIC33F DSC devices (data sheets, errata,
family reference manuals, etc.), please see the Microchip web site at:
www.microchip.com.
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.
MPLAB® Assembler Linker and Utilities for PIC24 MCUs and dsPIC® DSCs User’s
Guide
This document describes how to use Microchip Technology’s language tools for 16-bit
PIC24 MCU and dsPIC33 DSC devices based on GNU technology.
MPLAB® C Compiler for PIC24 MCUs and dsPIC® DSCs User’s Guide (DS51284)
This document helps you use Microchip’s 16-bit C compilers to develop your
application.
There are three compilers that support Microchip 16-bit devices. The first compiler,
previously called MPLAB C30, is now called MPLAB C Compiler for PIC24 MCUs and
dsPIC DSCs (supports all 16-bit devices).
Two additional compilers, subsets of the first, are:
1. MPLAB C Compiler for dsPIC DSCs (supports dsPIC30F/33F DSC devices)
2. MPLAB C Compiler for PIC24 MCUs (supports PIC24F/H MCU devices)
These compilers are GNU-based language tools, based on source code from the
Free Software Foundation (FSF). For more information about FSF, visit www.fsf.org.
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 as an aid in developing and
debugging application code.
dsPIC® DSC Speech Coding Solutions User’s Guide (DS70295)
This document describes the dsPIC DSC Speech Encoding/Decoding Libraries
including G.711, G.726A and Speex Speech Encoding/Decoding software application
solutions. The individual libraries provide toll-quality voice compression and
decompression to help generate speech-based embedded applications on the
dsPIC30F and dsPIC33F families of digital signal controllers.
© 2010 Microchip Technology Inc.
DS51700B-page 7
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
THE MICROCHIP WEB SITE
Microchip provides online support via 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, listing 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 www.microchip.com, click on 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 C18 and MPLAB C30 C compilers; MPASM™
and MPLAB ASM30 assemblers; MPLINK™ and MPLAB LINK30 object linkers;
and MPLIB™ and MPLAB LIB30 object librarians.
• In-Circuit Emulators – The latest information on Microchip in-circuit emulators.
These include the MPLAB REAL ICE and MPLAB ICE 2000.
• In-Circuit Debuggers – The latest information on Microchip in-circuit debuggers.
These include MPLAB ICD 3 and PICkit™ 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 IDE Project Manager, MPLAB Editor and
MPLAB SIM simulator, as well as general editing and debugging features.
• Programmers – The latest information on Microchip programmers. These include
the MPLAB PM3 device programmer and the PICSTART® Plus and PICkit 1 and 2
development programmers.
DS51700B-page 8
© 2010 Microchip Technology Inc.
Preface
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 field application engineer
(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 the web site at: http://support.microchip.com
DOCUMENT REVISION HISTORY
Revision A (February 2008)
• This is the initial released version of this document.
Revision B (May 2010)
This revision incorporates the following updates:
• Added step 4 in Section 2.1 “Running the Demo”.
• Removed the Animate and Step Over Debug toolbar buttons in Table 3-1.
• Additional minor corrections such as language and formatting updates are
incorporated throughout the document.
© 2010 Microchip Technology Inc.
DS51700B-page 9
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
NOTES:
DS51700B-page 10
© 2010 Microchip Technology Inc.
MPLAB STARTER KIT FOR
dsPIC® DIGITAL SIGNAL CONTROLLERS
USER’S GUIDE
Chapter 1. Introduction
Thank you for purchasing Microchip Technology’s MPLAB Starter Kit for dsPIC® Digital
Signal Controllers. This starter kit is intended to introduce and demonstrate the
features of the dsPIC33F Digital Signal Controllers (DSCs), and, in particular, some of
the speech and audio processing capabilities of dsPIC DSC devices. The starter kit
demonstrates a low-cost, yet effective software technique for processing acceptable
voice-quality audio. The board also includes a 24-bit audio codec for high-quality audio
applications. In addition, the starter kit has on-board in-circuit debug circuitry so that
you may develop and debug your own application. Alternatively, applications can use
the Audio Codec for converting the audio signal.
This chapter introduces the starter kit and provides an overview of its features. Topics
covered include:
• Overview
• Operational Requirements
• Board Setup
1.1
OVERVIEW
The MPLAB Starter Kit for dsPIC Digital Signal Controllers connects directly to a USB
port on a computer. The PC USB connection supplies communications and power to
the board.
The starter kit includes debug and programmer circuitry that allows applications to be
programmed onto the board’s dsPIC33FJ256GP506 device and then debugged, all
using MPLAB IDE.
Audio input signals from an external microphone or audio equipment are routed to the
ADC module in the on-board dsPIC33FJ256GP506 device for software processing.
Alternatively, applications can use the audio codec for converting the audio signal.
Output signals can be generated by the dsPIC33FJ256GP506 device’s Output
Compare module as a pulse-width modulated digital waveform. This pulse-width
modulated signal is converted to an analog signal by a low-pass filter on the starter kit
board. Alternatively, applications can output audio data using the audio codec. The
output audio signal is then amplified using a headphone amplifier circuit for playback
on an output device.
In addition to the Recommended Reading listed in the Preface, the following
manufacturers’ data sheets are also recommended as reference sources:
• National Semiconductor Corporation Data Sheet, “LM4811 Boomer® Audio Power
Amplifier Series Dual 105 mW Headphone Amplifier with Digital Volume Control
and Shutdown Mode” (DS200061).
• Wolfson Microelectronics Data Sheet, “WM8510 Mono CODEC with Speaker
Driver, Production Data”.
© 2010 Microchip Technology Inc.
DS51700B-page 11
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
1.2
OPERATIONAL REQUIREMENTS
To communicate with and program the starter kit, the following hardware and software
requirements must be met:
•
•
•
•
PC-compatible system
An available USB port on PC or powered USB hub
CD-ROM drive
Windows® 2000 SP4, Windows XP SP2, and Windows Vista™ (32-Bit)*
Operating Systems
* Only initial testing has been performed on 32-bit Vista for this release. 64-bit
Vista is not supported at this time.
• Playback on an output device (not included) – See Section 4.3.2.9 “Headphone
Stereo Output Jack (J8)” for requirements.
• Microphone (not included) – See Section 4.3.2.10 “Line/Microphone Input
Phone Jack (J9)” for requirements.
1.3
BOARD SETUP
Figure 1-1 shows a diagram of the starter kit setup. A microphone and a playback on
an output device will need to be connected to the board (not included). The USB
connection provides communication and power to the board. The demonstration
software on the dsPIC33FJ256GP506 device plays back speech stored on the board’s
serial Flash memory and allows recording and playback of recorded speech.
FIGURE 1-1:
MPLAB STARTER KIT FOR dsPIC® DIGITAL SIGNAL
CONTROLLERS SETUP
Playback on an output device
(not included)
USB
Starter Kit
dsPIC33FJ256GP506
Microphone
(not included)
MPLAB® IDE
DS51700B-page 12
© 2010 Microchip Technology Inc.
MPLAB STARTER KIT FOR
dsPIC® DIGITAL SIGNAL CONTROLLERS
USER’S GUIDE
Chapter 2. Speech Record and Playback Demo
This chapter describes the speech record and playback demonstration application that
is preloaded on the dsPIC33FJ256GP506 device. This application demonstrates how
to use the starter kit for speech capture, speech playback, speech encoding and
decoding, and using the serial Flash memory to store speech samples. Topics covered
include:
•
•
•
•
2.1
Running the Demo
Understanding the Demo
Examining Demo Software Flow
Other Demo Code Examples
RUNNING THE DEMO
To run the demonstration, follow these basic steps:
1. Connect a microphone to socket J9.
2. Connect headphones to socket J8.
3. Ensure that potentiometer R56 is set to the factory setting (i.e., the arrow on the
potentiometer points to the arrow on the board).
4. Power up the starter kit by connecting the board to the USB port of a computer.
You should briefly see a pop-up balloon in the system tray (lower right area of the
desktop) that states (1) new hardware has been found, (2) drivers are being
installed, and (3) new hardware is ready for use. If you do not see these
messages and the starter kit does not work, try reconnecting the USB. If this
does not work, see Section 3.8 “Troubleshooting”.
5. When powered up, the application will repeatedly playback an introductory
message.
To use the application, follow these steps:
1. To record speech, press switch S1 and wait until the red LED turns off (the serial
Flash memory is being erased) and the yellow LED turns on. The application will
now record the microphone audio signals and store them in the serial Flash
memory.
2. Press switch S2 to playback and listen to the stored speech samples. The green
LED is illuminated during playback.
3. Pressing switch S1 again erases the serial Flash memory and prepares the
system for another recording.
4. Adjust the potentiometer R56, as needed, to change the sensitivity of the
microphone. Turning the potentiometer clockwise decreases the sensitivity, and
turning it counter-clockwise increases the sensitivity.
© 2010 Microchip Technology Inc.
DS51700B-page 13
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
2.2
UNDERSTANDING THE DEMO
The dsPIC33FJ256GP506 device on the starter kit is preprogrammed with a speech
record and playback demonstration application. The CD that accompanies the starter
kit contains the application code. As shown in Figure 2-1, this sample application uses
the board to capture an input microphone signal using the audio codec. The application
program running on the device does the following:
• Reads an introductory speech message stored on the serial Flash memory and
uses the audio codec to playback the audio signal.
• If speech recording is desired, the application compresses the incoming digital
signal from 16 bits to eight bits using the G.711 μ-law encoding algorithm and
stores the encoded speech samples on the serial Flash memory.
• If playback is desired, the application reads the serial Flash memory device and
decodes the read samples using the G.711 μ-law decoding algorithm. The
application then uses the audio codec to playback the speech signal.
FIGURE 2-1:
SPEECH RECORD AND PLAYBACK DEMO OVERVIEW
STARTER KIT BOARD
dsPIC33FJ256GP506
Data
G.711
μ-LAW
ENCODE
DCI
AUDIO
CODEC
Control
G.711
μ-LAW
DECODE
2
I C™
SPI
Serial Flash Memory
The starter kit board also features circuitry for audio playback using the Pulse-Width
Modulation (PWM) technique. This technique can be used to implement a low-cost
audio playback system. For a demo of this technique, access the starter kit’s CD-ROM.
The demo program consists of three basic software elements: WM8510 Codec Driver,
G.711 Speech Encoder and Decoder, and Serial Flash Memory Driver.
2.2.1
WM8510 Codec Driver
The WM8510 codec driver configures the WM8510 audio codec and provides an
interface for reading and writing audio data to the codec. The driver is implemented in
WM8510CodecDrv.c file and the interface is defined in WM8510CodecDrv.h file. The
driver uses the DCI module on the dsPIC33FJ256GP506 device module to process
data and the Inter-Integrated Circuit™ (I2C™) module as a codec control bus. The
demo application configures the codec for an 8 kHz sampling rate.
DS51700B-page 14
© 2010 Microchip Technology Inc.
Speech Record and Playback Demo
2.2.2
G.711 Speech Encoder and Decoder
The G.711 encoder and decoder implement the ITU-T G.711 speech compression
algorithm. This algorithm is an example of a waveform coder and provides a
compression ratio of 2:1. The algorithm is implemented in G711.s file and its interface
is defined by G711.h file.
2.2.3
Serial Flash Memory Driver
The serial Flash memory driver uses the SPI peripheral on the dsPIC33FJ256GP506
device to interface with the external serial Flash memory device. The driver requires a
buffer for its operation and this buffer must be allocated by the application. The driver
allows the application to perform operations such as read, chip erase, sector erase and
status check.
2.3
EXAMINING DEMO SOFTWARE FLOW
The speech record and playback demonstration application uses the WM8510 codec,
G.711 speech encoding and decoding libraries, and the serial Flash memory drivers to
read, output and store speech signals with the starter kit. The application will encode a
microphone signal, store the encoded samples in serial Flash memory and playback
the decoded samples to a headphone output. The G.711 μ-law algorithm is used for
encoding and decoding speech samples. Figure 2-2 and Figure 2-3 are flow charts of
the demo application.
© 2010 Microchip Technology Inc.
DS51700B-page 15
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
FIGURE 2-2:
APPLICATION FLOW CHART – PART ONE
START
Initialize Audio Codec Driver
Initialize Flash Memory Driver
Start Audio Codec Driver
Start Flash Memory Driver
B(1)
No
No
Playback = 1?
Record = 1?
Playback
Introduction
Message
Yes
Yes
No
Is Flash Erased?
Erase Flash
Red LED On
A(1)
C(1)
Yes
Yellow LED On
Read Codec Data
G.711 μ-Law Encode
Store in Flash
Output Audio Data
No
Is Flash Full?
C(1)
Yes
A(1)
Note 1:
DS51700B-page 16
Refer to the corresponding letter in Figure 2-3: “Application Flow Chart – Part Two” for
the continuation of the flow chart.
© 2010 Microchip Technology Inc.
Speech Record and Playback Demo
FIGURE 2-3:
APPLICATION FLOW CHART – PART TWO
A
Read Serial Flash
Green LED On
G.711 μ-Law Decode
Output Audio Data to Codec
Yes
End of Message?
Rewind Playback
Pointer
No
C
Yes
Switch 1 Active?
Record = 1
Stop Playback
No
Yes
Switch 2 Active?
Playback = 1
Stop Record
No
B
© 2010 Microchip Technology Inc.
DS51700B-page 17
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
2.4
OTHER DEMO CODE EXAMPLES
The starter kit software CD includes two additional demonstration code examples:
• This code example demonstrates the low-cost speech capture and playback
option. It uses the dsPIC DSC 12-bit ADC to capture speech samples. The data is
stored in the serial Flash memory. The application then uses the Output Compare
module in PWM mode to generate a PWM signal representing the speech signal.
Note:
Jumper J6 should be in the OCPWM position to use this demo.
• This code example can be used to program the introductory message into the
serial Flash. This is useful in a case where the entire serial Flash has been erased
and it is desirable to set up the introductory message again.
Note:
DS51700B-page 18
The SASK Intro Speech Prog code example performs a full chip erase on
the serial Flash. In order to prevent accidental serial Flash chip, erase when
the board is taken in and out of Reset, erase the dsPIC33FJ256GP506
program Flash via MPLAB IDE after running the SASK Intro Speech Prog
code example. Refer to the readme.txt files in the project folder for more
information.
© 2010 Microchip Technology Inc.
MPLAB STARTER KIT FOR
dsPIC® DIGITAL SIGNAL CONTROLLERS
USER’S GUIDE
Chapter 3. Develop an Application
The MPLAB Starter Kit for dsPIC® Digital Signal Controllers may be used with MPLAB
IDE, the free integrated development environment available on Microchip’s web site.
MPLAB IDE allows the starter kit to be used as an in-circuit debugger as well as a
programmer for the featured device.
In-circuit debugging allows you to run, examine and modify your program for the device
embedded in the starter kit hardware. This greatly assists you in debugging your
firmware and hardware together.
Special starter kit software interacts with the MPLAB IDE application to run, stop and
single-step through programs. Breakpoints can be set and the device processor can be
reset. Once the device processor is stopped, the register’s contents can be examined
and modified.
For more information on how to use MPLAB IDE, refer to the following documentation:
• MPLAB® IDE User’s Guide (DS51519)
• MPLAB® IDE Quick Start Guide (DS51281)
• MPLAB® IDE On-line Help
This chapter includes the following:
•
•
•
•
•
•
•
•
•
3.1
Installing the Hardware and Software
Setting Up an Example Application for Debug
Running the Example Application
Debugging the Example Application
Programming the Debugged Application
Creating Other dsPIC DSC Applications
Determining Device Support and Reserved Resources
Troubleshooting
Settings Dialog Info Tab
INSTALLING THE HARDWARE AND SOFTWARE
To install the hardware:
If you have not already set up the hardware to run the demo, follow these steps:
1. Connect a microphone to socket J9.
2. Connect headphones to socket J8.
3. Ensure that potentiometer R56 is set to the factory setting (i.e., the arrow on the
potentiometer points to the arrow on the board).
4. Power up the starter kit by connecting the board to the USB port of a computer.
You should briefly see a pop-up balloon in the system tray (lower right area of the
desktop) that states (1) new hardware has been found, (2) drivers are being
installed, and (3) new hardware is ready for use. If you do not see these
messages and the starter kit does not work, try reconnecting the USB. If this
does not work, see Section 3.8 “Troubleshooting”.
5. When powered up, the application will repeatedly playback an introductory
message.
© 2010 Microchip Technology Inc.
DS51700B-page 19
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
To install the software:
Run the CD-ROM enclosed with the starter kit and install the software as directed.
3.2
SETTING UP AN EXAMPLE APPLICATION FOR DEBUG
The MPLAB IDE software that is installed on your PC by the starter kit CD-ROM,
automatically opens an example application that you may use to examine debug
features of the starter kit.
To prepare the application for debug:
1. Launch MPLAB IDE. The example application project and related workspace will
open. For information on projects and workspaces, see the MPLAB IDE
documentation mentioned at the beginning of this chapter.
2. Select Project>Build All to build the application code. The build process will be
visible in the Build tab of the Output window.
3. Select Debugger>Select Tool>Starter Kits. MPLAB IDE will change to add starter
kit debug features, as shown in Figure 3-1: (1) the status bar will show Starter
Kits as the debug tool, (2) a Starter Kit debug toolbar will be added, (3) the
Debugger menu will change to add Starter Kit debug functions and (4) the Output
window will display the communication status between MPLAB IDE and the
stater kit on the Starter Kit Debugger tab.
Also, several device resources are used for debug. For details, see
Section 3.7 “Determining Device Support and Reserved Resources”.
FIGURE 3-1:
STARTER KIT AS DEBUG TOOL
2
4
3
1
4. Select Debugger>Program to program the application code into the
dsPIC33FJ256GP506 DSC device on the starter kit. The debug programming
progress will be visible in the Starter Kit tab of the Output window.
Note:
DS51700B-page 20
Debug executive code is automatically programmed in the upper program
memory of the starter kit device when the starter kit is selected as a
debugger. Debug code must be programmed into the target device to use
the in-circuit debugging capabilities of the starter kit.
© 2010 Microchip Technology Inc.
Develop an Application
3.3
RUNNING THE EXAMPLE APPLICATION
The starter kit executes in either real-time (Run) or steps (Step Into, Step Over and
Animate) Real-time execution occurs when you select Run in MPLAB IDE. You can
step once the device code is halted, either by clicking Halt or setting a breakpoint in
MPLAB IDE.
TABLE 3-1:
DEBUG TOOLBAR BUTTONS IN MPLAB® IDE
Debugger Menu
Toolbar Buttons
Run
Halt
Step Into
Reset
The toolbar buttons specified in Table 3-1 can be used to perform the following possible
debug operations:
1. Select Debugger>Reset>Processor Reset, or click the Reset button to reset the
program.
2. Select Debugger>Run, or click the Run button. Observe how the application
operates.
3. Select Debugger>Halt, or click the Halt button to stop the program execution. A
green solid arrow will mark the line of code in the File window where the program
halted.
4. Select Debugger>Step Into, or click the Step Into button to step the program
execution once. The green solid arrow will move down one line of code in the File
window. Click the button several times to step through some code.
5. Select Debugger>Reset>Processor Reset, click the Reset button to reset the
program again. The arrow will disappear, meaning the device is reset.
3.4
DEBUGGING THE EXAMPLE APPLICATION
The problems should not arise while using the provided application code. However, this
is not always the case when developing your own code (the likelihood exists that your
code may not work the first time you use it and may require debugging). MPLAB IDE
provides an editor and several debug features such as breakpoints and Watch windows
to aid in application code debugging.
This section includes:
• Editing Application Code
• Using Breakpoints and Mouseovers
• Using Watch Windows
© 2010 Microchip Technology Inc.
DS51700B-page 21
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
3.4.1
Editing Application Code
To view application code so it may be edited, do one of the following:
• Select Edit>New to create new code or Edit>Open to search for and open an
existing code file.
• Double-click on a file in the Project window to open an existing code file. An
example Project window is shown in Figure 3-2.
FIGURE 3-2:
EXAMPLE PROJECT
Existing Code File
For more information on using the editor to create and edit code, see MPLAB Editor
Help.
3.4.2
Using Breakpoints and Mouseovers
To set a breakpoint in code:
1. Double-Click in the Gutter: Double-click in the window gutter next to the line of
code where you want the breakpoint. Double-click again to remove the
breakpoint.
Note:
Double-click must be set up for breakpoints. See Edit>Properities,
ASM/C/BAS File Type tab, check box for “Double-click Toggles
Breakpoint”.
2. Pop-up Menu: Place the cursor over the line of code where you want the
breakpoint. Then, right-click to open a pop-up menu and select “Set Breakpoint”.
Once a breakpoint is set, “Set Breakpoint” will become “Remove Breakpoint” and
“Disable breakpoint”. Other options on the pop-up menu under Breakpoints can
be used for deleting, enabling or disabling all breakpoints.
3. Breakpoint Dialog: Open the Breakpoint dialog (Debugger>Breakpoints) to set,
delete, enable or disable breakpoints. See MPLAB IDE Help for more information
on this dialog.
DS51700B-page 22
© 2010 Microchip Technology Inc.
Develop an Application
A breakpoint set in code will appear as a red hexagon with a “B” as shown in Figure 3-3.
FIGURE 3-3:
EXAMPLE BREAKPOINT
Once code is halted, hovering over a variable shows its current value (see Figure 3-3).
Note:
3.4.3
This feature must be set up. See Edit>Properties, Tooltips tab, and select
the “Enable Variable Mouseover Values” check box.
Using Watch Windows
To use a Watch window:
1. The Watch window is made visible on the desktop by selecting View>Watch. It
contains four selectable Watch views (via tabs) in which to view variables (SFRs,
symbols and absolute addresses).
2. Select an SFR or Symbol from the list and click the related Add button to add it
to the Watch window. Alternatively, click in the “Address” column and enter an
absolute address.
A Watch window populated with SFRs and symbols is shown in Figure 3-4. For more
information on using Watch windows, see MPLAB IDE Help.
FIGURE 3-4:
© 2010 Microchip Technology Inc.
EXAMPLE WATCH
DS51700B-page 23
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
3.5
PROGRAMMING THE DEBUGGED APPLICATION
When the program is successfully debugged and running, the next step is to program
the device for stand-alone operation in the finished design. When doing this, the
resources reserved for debug are released for use by the application. To program the
application, use the following steps:
1. Disable Starter Kits as a debug tool by selecting Debugger>Select Tool>None.
2. Select Starter Kits as the programmer in the Programmer>Select Programmer
menu.
3. Select Programmer>Program.
Now the starter kit will run independently.
3.6
CREATING OTHER dsPIC DSC APPLICATIONS
This starter kit is just one way to use Microchip dsPIC DSCs in an application. Other
tools and resources exist to support these devices.
• dsPIC DSC Demo Boards – Many boards are available for developing
applications. On the Microchip web site (http://www.microchip.com/), browse to
Design>Development Tools>Demo Boards>dsPIC DSC.
• MPLAB C30 C Compiler, Full Version – More optimization options than the
student version for full-scale development. See http://www.microchip.com/c30.
3.7
DETERMINING DEVICE SUPPORT AND RESERVED RESOURCES
Due to the built-in in-circuit debugging capability of ICD devices and the In-Circuit Serial
Programming™ (ICSP™) function offered by the debugger, the starter kit uses some
on-chip resources when debugging. It also uses program memory and file register locations in the target device during debugging. These locations are not available for use by
user code. In the MPLAB IDE, registers marked with an “R” in register displays represent
reserved registers.
For information on device resources that are needed for in-circuit debugging, please
refer to the MPLAB ICD 3 Help, found in MPLAB IDE under Help>Topics. The device
reserved resource information found under “Resources Used By MPLAB ICD 3” is the
same for the starter kit.
DS51700B-page 24
© 2010 Microchip Technology Inc.
Develop an Application
3.8
TROUBLESHOOTING
3.8.1
Debug Connection Problems
While using the starter kit as a debugger, you may receive the error “Unable to Enter
Debug Mode” when programming the device. This can result from communication
being lost between the starter kit and MPLAB IDE, which can be resolved as follows:
1. Unplug the USB cable from the starter kit.
2. Plug the USB cable back into the starter kit.
MPLAB IDE should automatically reconnect to the starter kit. If this does not work, do
the following:
1. Check the USB connection between the PC and starter kit at both ends.
2. If using a USB hub, make sure it is powered.
3. Make sure the USB port is not in use by another device.
3.8.2
Programming Problems
If, during the course of developing your own application you can no longer program the
device on the starter kit, you may have set device configuration bits to code protect or
some other state that prevents programming. To view the settings of the configuration
bits, select Configure>Configuration Bits.
3.9
SETTINGS DIALOG INFO TAB
When you select Debugger>Settings or Programmer Settings, you will open the Starter
Kit Settings dialog.
Currently, there is only one (Info) tab on this dialog, displaying the following
information:
• Firmware Version: The version of firmware on the starter kit board.
• Debug Exec Version: The version of the debug executive that is loaded into the
dsPIC33FJ256GP506 device program memory to enable debug operation.
© 2010 Microchip Technology Inc.
DS51700B-page 25
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
NOTES:
DS51700B-page 26
© 2010 Microchip Technology Inc.
MPLAB STARTER KIT FOR
dsPIC® DIGITAL SIGNAL CONTROLLERS
USER’S GUIDE
Chapter 4. Hardware
This chapter provides a functional overview of the MPLAB Starter Kit for dsPIC® Digital
Signal Controllers and identifies the major hardware components. Topics covered
include:
• Audio Functional Overview
• Debug Functional Overview
• Board Components
4.1
AUDIO FUNCTIONAL OVERVIEW
Figure 4-1 illustrates the block diagram for mainstream operation of the starter kit.
FIGURE 4-1:
STARTER KIT BLOCK DIAGRAM
LINE/MIC
SELECT
MICROPHONE
LINE/MICROPHONE
AMPLIFIER
J7
LINE INPUT
ANTIALIASING
LOW-PASS
FILTER
3 db to 23 db
TEMPERATURE
SENSOR
In
Out
AUDIO
CODEC
AN0
AN4
DCI
dsPIC33FJ256GP506
Device
I2C™
HEADPHONES
HEADPHONE
AMPLIFIER
SPI
J6
LOWPASS
FILTER
-33 db to 12 db
4.1.1
4 Mb
FLASH
MEMORY
OUTPUT
SELECT
OC1
Speech Sampling
The incoming audio signal can come from a line input or a condenser microphone. The
speech sampling input is jumper selected (J7). The selected signal is amplified by a
non-inverting AC amplifier (Line/Microphone Amplifier) and routed to the ADC module
on the dsPIC33FJ256GP506 device through an anti-aliasing filter. This sixth-order
Sallen-Key low-pass filter has a cut-off frequency of 3300 Hz. The output of the
anti-aliasing filter is connected to input AN0 of the ADC module on the device. If the
input to the amplifier is a condenser microphone, a bias voltage provides a working
supply voltage for the microphone. The line input does not require this bias voltage.
The amplifier has a variable gain from 3 db to 23 db, which can be adjusted to control
microphone sensitivity or boost a low line-input signal. The output of the amplifier is
biased at 1.65V.
© 2010 Microchip Technology Inc.
DS51700B-page 27
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
4.1.2
Speech Playback
The mainstream speech playback interface processes the PWM digital signal from the
Output Compare module of the dsPIC33FJ256GP506 device. A low-pass filter
demodulates the PWM signal as shown in Figure 4-2. The low-pass filter behaves like
an integrator whose output signal amplitude depends on the duty cycle of the input
PWM waveform. The PWM frequency should be an integral multiple of the audio
sampling rate.
FIGURE 4-2:
PWM DEMODULATION
PWM SIGNAL FROM OCPWM
LOW-PASS FILTER
DEMODULATED AUDIO SIGNAL
R
C
The output of the low-pass filter feeds the headphone amplifier. The headphone
amplifier drives an audio headphone. This amplifier can drive up to 75 mW into a 32Ω
headphone. The amplifier uses a digital volume control that is controlled by I/O lines
from the dsPIC33FJ256GP506 device.
4.1.3
Codec
The audio codec can be used for a higher-end audio application. The input to the audio
codec is the output of the line/microphone pre-amplifier. The output feeds the
headphone amplifier. The codec must interact with the application program running on
the dsPIC33FJ256GP506 device. Commands from the application program control the
codec operating parameters (such as communication protocol, sampling rate, volume
control, level control, filter settings, etc.). Command information is exchanged over the
I2C module on the device.
The codec converts the incoming audio signal to a digital signal for the Digital
Converter Interface (DCI) module of the dsPIC33FJ256GP506 device. Audio output
from the application program is sent to the codec via the DCI module. The codec
converts this digital signal to audio for the headphone amplifiers.
4.1.4
4 Mb Serial Flash Memory
The starter kit includes 4 Mb serial Flash memory that can be used for storing data. The
memory interfaces with the SPI bus on dsPIC33FJ256GP506 device and might
typically be used by applications that require storage of speech samples for playback
purposes.
DS51700B-page 28
© 2010 Microchip Technology Inc.
Hardware
4.2
DEBUG FUNCTIONAL OVERVIEW
Figure 4-3 illustrates the block diagram for debugging/programming operation of the
starter kit.
FIGURE 4-3:
STARTER KIT DEBUG BLOCK DIAGRAM
USB Mini-B
Jack
12 MHz
Crystal
3.3V LDO
Regulator
Status
LEDs
SPI
ICSP™
PIC18F67J50 Device
Serial EEPROM
25LC010A
dsPIC33FJ256GP506
Device
The starter kit, with its built-in debugger/programmer, provides an all-in-one solution for
debugging and programming applications using MPLAB IDE. Also, no additional
external power supply is needed as power is supplied by the host PC’s USB port.
The starter kit’s debugging/programming operations are controlled by a PIC18F67J50
MCU running at 48 MHz. The PIC18F67J50’s built-in USB engine provides the
communication interface between the starter kit and the host PC.
Power to the starter kit is provided via USB, whose nominal 5V unregulated supply is
regulated by a Microchip MC1727 3.3V low-dropout (LDO) linear regulator. Proper
starter kit main system power is indicated by the green LED ‘D1’.
The PIC18F67J50 MCU accomplishes debugging or programming of the target
dsPIC33FJ256GP506 device by controlling the target’s MCLR, PGEC1 and PGED1
signals. Target power is switched on or off via a low VCE saturation PNP transistor
configured as a high-side switch. Target clocking is also provided by the PIC18F67J50
MCU.
A Microchip 25LC010A serial EEPROM is used to store the starter kit’s serial number
and debug control information.
© 2010 Microchip Technology Inc.
DS51700B-page 29
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
4.3
BOARD COMPONENTS
Figure 4-4 identifies the key starter kit hardware components.
FIGURE 4-4:
STARTER KIT
U1
U5
U8
D1
J1
J8
J6
U7
U9
U11
D2
U2
U6
J7
J9
U10
U3
R56
Q1
D3
S1
Item
D4
D5
S2
Component
Item
Component
D1
Mini-B USB Connector (J1)
A5
Output Select Jumper (J6)
D2
MCP1727 (U1)
A6
Codec (U9)
D3
STATUS LED – Debug (D2)
A7
Headphone Amplifier (U11)
D4
STATUS LED – System Power (D1)
A8
Line/Microphone Input Select Jumper (J7)
D5
PIC18F67J50 MCU (U2)
A9
Headphone Stereo Output Jack (J8)
D6
Low VCE Saturation PNP Transistor Switch (Q1)
A10
Line/Microphone Input Phone Jack (J9)
D7
25LC010A Serial EEPROM (U3)
A11
User LEDs (D3,D4 and D5)
A1
Flash Memory (U5)
A12
Microphone Gain Control (R56)
A2
Digital Signal Control (U6)
A13
Line/Microphone Pre-Amplifier (U10:A)
A3
Temperature Sensor (U7)
A14
Anti-Aliasing Low-Pass Filter (U10:B,C,D)
A4
PWM Low-Pass Filter (U8:A,B)
A15
User Switches (S2 and S1)
Legend: D# = Debug components, A# = Audio components
DS51700B-page 30
© 2010 Microchip Technology Inc.
Hardware
4.3.1
Debug Components
The following components support the debug function of the starter kit. See Appendix
A. “Schematics” for debug schematics.
4.3.1.1
MINI-B USB CONNECTOR (J1)
Provides system power and bidirectional communication between the host PC and the
starter kit.
4.3.1.2
MCP1727 (U1)
3.3V linear regulator. Regulates the USB unregulated voltage to 3.3V (with respect to
VSS) and supplies the starter kit with system power.
4.3.1.3
STATUS LED – DEBUG (D2)
When lit, indicates that communication between the starter kit and MPLAB IDE has
been successfully established.
4.3.1.4
STATUS LED – SYSTEM POWER (D1)
When lit, indicates that the starter kit is powered via the USB.
4.3.1.5
PIC18F67J50 MCU (U2)
Controls the programming/debugging operations of the target dsPIC33FJ256GP506
DSC.
4.3.1.6
LOW VCE SATURATION PNP TRANSISTOR SWITCH (Q1)
Provides target power (via high-side switching) to the dsPIC33FJ256GP506 DSC (and
ancillary circuitry) via control by the PIC18F67J50 programming/debugging MCU.
4.3.1.7
25LC010A SERIAL EEPROM (U3)
Provides nonvolatile parameter storage for the PIC18F67J50 MCU.
4.3.2
Audio Components
The following components support the audio portion of the starter kit. See Appendix
A. “Schematics” for audio schematics.
4.3.2.1
FLASH MEMORY (U5)
The starter kit includes a serial Flash memory chip (A1). The power supply for U5 is
provided by regulator U4. The regulator provides the required amount of current for
Flash programming operation.
4.3.2.2
DIGITAL SIGNAL CONTROL (U6)
The dsPIC33FJ256GP506 DSC (A2) provides the computation and processing
resource for application development on the starter kit. This DSC features 256 KB of
program Flash and 16 KB RAM. The application can either use the on-chip FRC or the
external 12 MHz signal as clock source.
4.3.2.3
TEMPERATURE SENSOR (U7)
The starter kit includes a temperature sensor (A3) that interfaces to the ADC module
on the dsPIC33F device. The temperature sensor is a Microchip TC1047.
© 2010 Microchip Technology Inc.
DS51700B-page 31
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
4.3.2.4
PWM LOW-PASS FILTER (U8:A,B)
The PWM signal from the Output Compare module on the dsPIC33FJ256GP506
device on the board is demodulated by the PWM low-pass filter (A4). This fourth-order
filter uses two Op amps (U8:A and U8:B) on the MCP6022 quad Op amp IC.
4.3.2.5
OUTPUT SELECT JUMPER (J6)
The Output Select Jumper (A5) determines whether the input signal for the headphone
amplifiers comes from the PWM filter or the audio codec. Default setting is CODEC.
4.3.2.6
CODEC (U9)
The starter kit includes an audio codec (A6) that interfaces to the DCI module (data
interface) and I2C bus (control interface) of the dsPIC33FJ256GP506 device. It is AC
coupled to the output of the line/microphone amplifier (MIC2).
The codec is a Wolfson WM8510 and uses a 12 MHz clock signal generated by U2 for
clocking.
4.3.2.7
HEADPHONE AMPLIFIER (U11)
The headphone amplifier (A7) is a National Semiconductor LM4811 70-mW stereo
amplifier with digital volume control. The input to the amplifier is controlled by the
setting of output select jumper J6. The output of the amplifier is available through the
headphone stereo output jack (J8).
Gain is controlled by the logic levels applied through the device I/O ports to the CLK
and UP/DN pins of U11. Each time the CLK line goes logic high, the gain increases or
decreases by 3 dB, depending on the logic level of the UP/DN line. The gain can be
adjusted over a range of -33 db to +12 db in 16 discrete gain settings.
4.3.2.8
LINE/MICROPHONE INPUT SELECT JUMPER (J7)
The line/microphone input select jumper (A8) determines if the line/microphone
pre-amplifier (U10:A) operates as a line amplifier or a microphone amplifier. If the MIC
option is selected, a bias voltage of +3.3V is applied to the line/microphone input phone
jack (J9). The default setting is MIC.
4.3.2.9
HEADPHONE STEREO OUTPUT JACK (J8)
The headphone jack (A9) is a 3.5 mm stereo connector. A 32Ω headphone can be
connected to this socket.
4.3.2.10
LINE/MICROPHONE INPUT PHONE JACK (J9)
The line/microphone input (A10) is a 3.5 mm mono input phone jack (SJ3504). This
connection accepts either a condenser microphone or a line level signal.
4.3.2.11
USER LEDS (D3,D4 AND D5)
The starter kit features three general purpose LEDs (A11), which are connected to the
I/O ports on the dsPIC33FJ256GP506 device. The user application can use these
LEDs for indication purposes.
4.3.2.12
MICROPHONE GAIN CONTROL (R56)
The MIC ADJ potentiometer R56 (A12) controls the gain of the line/microphone
pre-amplifier (U10:A). The default setting is with the arrow on the potentiometer
pointing to the arrow on the board.
Note:
DS51700B-page 32
Setting the gain too high can cause the output of the amplifier to saturate
and clip.
© 2010 Microchip Technology Inc.
Hardware
4.3.2.13
LINE/MICROPHONE PRE-AMPLIFIER (U10:A)
The line/microphone pre-amplifier (A13) is implemented using one of the four Op amps
on the MCP6024 quad Op amp IC (U10). The output of this non inverting AC amplifier
is biased at 1.65V. The gain of the amplifier is controlled by Potentiometer R56, as
given by Equation 4-1.
EQUATION 4-1:
INPUT PRE-AMPLIFIER GAIN
( R56 + R50 )
Gain = 1 + ⎛⎝ -------------------------------⎞⎠
R44
4.3.2.14
ANTI-ALIASING LOW-PASS FILTER (U10:B,C,D)
The anti-aliasing low-pass filter (A14), uses three of the four operational amplifiers on
the MCP6024 quad Op amp IC (U10). The output of the line/microphone
pre-amplifier (A13) uses an anti-aliasing low-pass sixth order Sallen-Key structure to
filter the signal and provide a cut-off frequency of 3300 Hz.
4.3.2.15
USER SWITCHES (S2 AND S1)
The starter kit features two press switches (A15), which are connected to the I/O ports
on the dsPIC33FJ256GP506 device. The function of these switches is defined by the
user application.
© 2010 Microchip Technology Inc.
DS51700B-page 33
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
NOTES:
DS51700B-page 34
© 2010 Microchip Technology Inc.
MPLAB STARTER KIT FOR
dsPIC® DIGITAL SIGNAL CONTROLLERS
USER’S GUIDE
Appendix A. Schematics
The following schematic diagrams are included in this appendix:
Debug
• Figure A-1: Debug Input and Control Schematic – Part 1
• Figure A-2: Debug Input and Control Schematic – Part 2
• Figure A-3: USB Interface/Target Power Switching Schematic
Audio
•
•
•
•
•
•
•
Figure A-4: Speech Processing Schematic
Figure A-5: Flash Memory Schematic
Figure A-6: Output Compare Module PWM Filters Schematic
Figure A-7: Audio Codec Schematic
Figure A-8: Audio Input Schematic
Figure A-9: Audio Output Schematic
Figure A-10: User LEDs, User Switches and Temp Sensor Schematics
© 2010 Microchip Technology Inc.
DS51700B-page 35
DS51700B-page 36
PIC18F67J50
© 2010 Microchip Technology Inc.
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
DEBUG INPUT AND CONTROL SCHEMATIC – PART 1
FIGURE A-1:
© 2010 Microchip Technology Inc.
FIGURE A-2:
DEBUG INPUT AND CONTROL SCHEMATIC – PART 2
PIC18F67J50 Bypass/Decoupling Capacitors
(VDD pin 26 and VSS)
+3.3V
C7
1
(VDD pin 38 and VSS) (VDD pin 57 and VSS)
+3.3V
+3.3V
C12
C15
1
1
Serial EEPROM
+3.3V
C14
R11
Status LED - Debug
+3.3V
U3
5
8
VCC
Sl
6 SCK
1
CS
3 WP
HOST_MASTER_SDO
HOST_MASTER_SPI_SCK
CHIP_SELECT_SERIAL_EEPROM__1
WRITE_PROTECT_SERIAL_EEPROM1
R10
D2
10k
1k
1
SO 2
HOST_MASTER_SPI_SDI
7 HOLD
VSS
4
25LC010A_S08_SN
GREEN
R14
330
HOST_LED_RUN_DEBUG
Schematics
DS51700B-page 37
USB INTERFACE/TARGET POWER SWITCHING SCHEMATIC
USB Interface
(Bus Powered)
3.3V LDO
Linear Regulator
Status LED System Power
Host MCU Switchable
3.3V Regulated Supply
© 2010 Microchip Technology Inc.
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
DS51700B-page 38
FIGURE A-3:
SPEECH PROCESSING SCHEMATIC
© 2010 Microchip Technology Inc.
FIGURE A-4:
dsPIC33FJ256GP506
Schematics
DS51700B-page 39
FLASH MEMORY SCHEMATIC
4 Mb High-Speed SPI
Serial Flash Memory
(512k x 8)
Flash Memory
3.3V Regulator
© 2010 Microchip Technology Inc.
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
DS51700B-page 40
FIGURE A-5:
OUTPUT COMPARE MODULE PWM FILTERS SCHEMATIC
© 2010 Microchip Technology Inc.
FIGURE A-6:
Schematics
DS51700B-page 41
DS51700B-page 42
© 2010 Microchip Technology Inc.
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
AUDIO CODEC SCHEMATIC
FIGURE A-7:
© 2010 Microchip Technology Inc.
FIGURE A-8:
AUDIO INPUT SCHEMATIC
Line/Microphone Input Pre-Amplifier
Anti-Aliasing Filter
10
Schematics
DS51700B-page 43
DS51700B-page 44
Power Amplifier for Headphone
© 2010 Microchip Technology Inc.
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
AUDIO OUTPUT SCHEMATIC
FIGURE A-9:
© 2010 Microchip Technology Inc.
FIGURE A-10:
USER LEDS, USER SWITCHES AND TEMP SENSOR SCHEMATICS
User LEDs
User Switches
Temperature Sensor
Schematics
DS51700B-page 45
MPLAB Starter Kit for dsPIC® DSCs User’s Guide
NOTES:
DS51700B-page 46
© 2010 Microchip Technology Inc.
MPLAB STARTER KIT FOR
dsPIC® DIGITAL SIGNAL CONTROLLERS
USER’S GUIDE
Index
A
O
Audio Codec Schematic........................................... 42
Audio I/O Schematics .........................................43, 44
OCPWM Filters Schematic ...................................... 41
B
Playback................................................................... 28
Programmer ............................................................. 24
PWM ........................................................................ 11
Bias Voltage ............................................................. 27
Board Components .................................................. 30
Breakpoints .............................................................. 21
C
Codec..................................................................11, 28
Configuration Bits..................................................... 25
Customer Notification Service.................................... 8
Customer Support ...................................................... 9
D
Debug .................................................................11, 29
Executive .......................................................... 20
Input and Control Schematic .......................36, 37
Reserved Resources ........................................ 24
Setup ................................................................ 20
Digital Volume Control ............................................. 28
Documentation
Conventions ........................................................ 6
Layout ................................................................. 5
P
R
Reading, Recommended ........................................... 7
Reserved Resources................................................ 24
Reset........................................................................ 21
Run........................................................................... 21
S
Schematic Diagrams ................................................ 35
Serial EEPROM ....................................................... 29
Software Installation................................................. 19
Speech Sampling ..................................................... 27
Speech Sampling Interface Schematic .................... 35
Step.......................................................................... 21
T
Target Power Switching Schematic ......................... 38
Troubleshooting ....................................................... 25
F
U
Flash Memory .......................................................... 28
Flash Memory Schematic......................................... 40
Flow Chart................................................................ 15
Unable to Enter Debug Mode................................... 25
USB.................................................................... 11, 29
USB Interface Schematic ......................................... 38
G
W
G.711 µ-law algorithm.............................................. 14
Warranty Registration ................................................ 7
Watch Window ......................................................... 21
WWW Address........................................................... 8
H
Halt........................................................................... 21
Hardware Installation ............................................... 19
Headphone .............................................................. 11
Host Computer Requirements.................................. 12
I
Install........................................................................ 19
Internet Address......................................................... 8
L
Line Input ................................................................. 27
M
Manufacturers’ Data Sheets .................................... 11
Microchip Internet Web Site ....................................... 8
Microphone .............................................................. 11
MPLAB IDE .........................................................11, 19
© 2010 Microchip Technology Inc.
DS51700B-page 47
WORLDWIDE SALES AND SERVICE
AMERICAS
ASIA/PACIFIC
ASIA/PACIFIC
EUROPE
Corporate Office
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Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
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Web Address:
www.microchip.com
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Tel: 86-756-3210040
Fax: 86-756-3210049
01/05/10
DS51700B-page 48
© 2010 Microchip Technology Inc.