AN_357

Future Technology Devices International Ltd.
AN_357
Android Java D2xx Demo Application
for FT4222
Document Reference No.:FT_001142
Version 1.0
Issue Date: 2015-01-21
This document provides the application programming interface (API) for the Java
D2xx for Android library.
Future Technology Devices International Limited (FTDI)
Unit 1,2 Seaward Place, Glasgow G41 1HH, United Kingdom
Tel.: +44 (0) 141 429 2777 Fax: + 44 (0) 141 429 2758
E-Mail (Support): [email protected] Web: http://www.ftdichip.com
Copyright © 2015 Future Technology Devices International Limited
Use of FTDI devices in life support and/or safety applications is entirely at the user’s risk, and the user agrees to
defend, indemnify and hold harmless FTDI from any and all damages, claims, suits or expense resulting from such
use.
Android Java D2xx Demo Application for FT4222
Version: 1.0
Document Reference No.FT_001142
Clearance No.:FTDI# 437
Table of Contents
1
2
Introduction .................................................................... 2
1.1
Android Support ........................................................................ 2
1.2
Prerequisites............................................................................. 2
Using the FTDI Java D2xx for Android Library................. 3
2.1
3
4
Introduction and Usage ............................................................ 3
Demo Application ............................................................ 6
3.1
Information .............................................................................. 6
3.2
SPI ............................................................................................ 7
3.3
I2C ............................................................................................ 9
3.4
GPIO ....................................................................................... 11
Appendix A – References............................................... 13
4.1
Acronyms and Abbreviations................................................... 13
5
Appendix B – List of figures .......................................... 14
6
Appendix C – Revision History....................................... 15
7
Contact Information ...................................................... 16
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Android Java D2xx Demo Application for FT4222
Version: 1.0
Document Reference No.FT_001142
Clearance No.:FTDI# 437
1
Introduction
FTDI provides a proprietary D2XX interface for easy communication with FTxxxx devices. The D2XX API
is common across several operating systems supported by FTDI, namely Windows, Windows CE, Linux,
Mac OS X and Android. This document explains how to operate the FT4222H demo APK and the functions
of all available UI in the FT4222H demo APK.
1.1 Android Support
A Java class library supporting a USB Host is available and applicable to Android v3.2 or any later series.
This library requires no special root access privileges.
1.2 Prerequisites
The following is required to install the FTDI D2xx driver:

An Android device(recommended),
o
A BSP supporting the Android USB Host API corresponding to AOSP 3.2 or later
o
A contemporary Android device running v3.2 or a later OS, with a USB Host or OTG
interface. FTDI testing was conducted using a Google Nexus 7.
An FTDI chip FT4222H based module to test the FTDI D2xx driver
NOTE:
To develop an application using the FTDI D2xx driver for Android, the development machine must have
the Eclipse IDE and an up-to-date version of the Android SDK, including the ADB program and Android
ADT Plugin installed. The installation and configuration of these tools is not included in this document.
For more information, please see (http://developer.Android.com/sdk/index.html).
The Android device should also have USB Debugging enabled to allow access using the ADB utility. To
accomplish this, navigate to Settings > Applications > Development and check the USB debugging
option.
A summary of the required configuration is provided in the diagram below.
Development Machine
Eclipse IDE with ADT Plugin
Android SDK
Android ADB Utility
Android Device
ADB
Connection
over USB
USB Host Capability
USB Debugging Enabled
Wi-Fi/LAN Enabled
Figure 1: Android Development Configuration
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Android Java D2xx Demo Application for FT4222
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2 Using the FTDI Java D2xx for Android Library
2.1 Introduction and Usage
To support versatile tablet usage scenarios, Google has included a USB Host API in Android since version
3.1. Before version 3.1, an Android application could not access USB devices attached to a system
naturally without root access rights. The Android USB Host API removes this limitation, allowing users to
utilize the USB gadgets attached to an Android Host or OTG port.
FTDI provides a Java class library that adapts to applications so that the developer can focus on the
desired input and output data. The design goal of the class library is to provide access to all the D2XX
functions including, EEPROM functions.
The D2xx library can be included in an Android application project in Eclipse. First, copy the library file,
d2xx.jar, to the folder of the project, and add it in “Project”–“Properties”. Refer to Figure 2 ~ Figure 4,
which show how to add the library file from the “\libs” sub-folder of the project folder.
Figure 2: Select “Project” – “Properties”
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Android Java D2xx Demo Application for FT4222
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Figure 3: Select “Java Build Path” – “Libraries” – “Add JARs”
Figure 4: Select the library file – d2xx.jar
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Android Java D2xx Demo Application for FT4222
Version: 1.0
Document Reference No.FT_001142
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The D2xx Java library is fully documented using Javadoc. For information on the D2xx Android library
methods, constants and sub-classes, please consult the corresponding Javadoc entry in the sample
project’s /doc directory.
A sample application demonstrating how to use various methods in the D2xx Java library is shown in
section 3 Demo Application.
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Android Java D2xx Demo Application for FT4222
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3 Demo Application
3.1 Information
Figure 5 Demo Application Screenshot – Information
This demo application contains a Refresh button. Tap Refresh to access information about the
connected device.
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Android Java D2xx Demo Application for FT4222
Version: 1.0
Document Reference No.FT_001142
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3.2 SPI
3.2.1
SPI Hardware
The diagram below shows how the FT4222H can be connected for use with this demo. Two FT4222H are
set to CNFMODE0 and have hardwired SPI master/slave pins. Then a USB Hub is used for connecting
both chips to an Android device. Please also refer to the FT4222H datasheet for more information.
Figure 6 SPI Demo System Diagram
3.2.2
SPI Application
Figure 7 Demo Application Screenshot – FT4222 –SPI
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Android Java D2xx Demo Application for FT4222
Version: 1.0
Document Reference No.FT_001142
Clearance No.:FTDI# 437
This demo application contains Config, Master Read, Master Write, Slave Read and Slave Write
buttons .
The first row contains a Config button to set the SPI configuration with several selectable setting items.
The SPI configuration settings allow the Polarity / Phase to be set for CPOL = 0 or 1, CPHA = 0 or 1.
System clock may be set to 24, 48, 60 or 80 Mhz.
Divider may be set to a value between 1/2 and 1/512.These parameters are used to generate the SPI
clock and to sample data for SPI read/write functions. For instance, with an 80 MHz system clock and
1/2 divider, the SPI clock will be 40 MHz. The polarity and phase are the sampling trigger to read data
from the input pin.
The Config button has to be pressed before sending data.
From the second row to the last row are the control fields for transmitting and receiving data; data
exchanging functions are divided into Master Write, Master Read, Slave Write, and Slave Read fields.
The Master Write field:
The Write Data is an editable text widget which allows any text data to be transmitted to the SPI slave.
The Transmit Bytes widget is a message box which shows the total number of bytes that the master
has successfully transmitted.
The Master Write is a button widget for triggering write operation.
The Slave Write field:
The Write Data is an editable text widget which allows any text data to be transmitted to the SPI
master . The Transmit Bytes widget is a message box shows the total number of bytes that the slave
has successfully transmitted. The Slave Write is a button widget for triggering a write operation.
The Master Read field:
The Number of Bytes widget is an editable text field which specifies the total number of bytes that the
SPI master is expected to receive. The Read Data widget is a message box which shows the content of
receiving data. The Receive Bytes widget is a message box shows the total number of bytes that the
SPI master actually received from the SPI slave. The Master Read is a button widget for triggering a
read operation and data must transmit from the Slave Write in order to obtain the data.
The Slave Read field:
The Number of Bytes widget is an editable text field which specifies the total number of bytes that the
SPI slave is expected to receive. The Read Data widget is a message box which shows the content of
received data. The Receive Bytes widget is a message box which shows the total number of bytes that
the SPI slave actually receive from the SPI master. The Slave Read is a button widget for triggering a
read operation and data must be transmitted from the Master Write prior to the read operation
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Android Java D2xx Demo Application for FT4222
Version: 1.0
Document Reference No.FT_001142
Clearance No.:FTDI# 437
3.3 I2C
3.3.1
I2C Hardware
The diagram below shows how the FT4222H can be connected to be used with this demo. Two FT4222H
devices are set to CNFMODE0 and have hardwired I2C master/slave pins. Then a USB Hub is used for
connecting both chips to an Android device. More detailed information can be found in FT4222H
datasheet.
Figure 8 I2C Demo System Diagram
3.2.2
I2C Application
Figure 9 Demo Application Screenshot – FT4222 I2C
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Android Java D2xx Demo Application for FT4222
Version: 1.0
Document Reference No.FT_001142
Clearance No.:FTDI# 437
This demo application contains Config, Master Read, Master Write, Slave Read and Slave Write
buttons.
The first row contains a Config button to set the I2C configuration with several selectable setting items.
The I2C configuration settings allow the Frequency to be set for 60K, 100K, 400K, 1M or 3.4MHz.
Device Address(HEX) allow the user to input the I2C address between 0x00~ 0x7F.
The Config button has to be pressed before sending data.
From the second row to the last row are the control fields for transmitting and receiving data; data
exchanging functions are divided into Master Write, Master Read, Slave Write, and Slave Read fields.
The Master Write field:
The Write Data is an editable text widget which allows any text data to be entered for transmitting to
the I2C slave. The Transmit Bytes widget is a message box which shows the total number of bytes that
the master has successfully transmitted. The Master Write is a button widget for triggering the write
operation.
The Slave Write field:
The Write Data is an editable text widget which allows any text data to be entered for transmitting to
the I2C master. The Transmit Bytes widget is a message box which shows the total number of bytes
that the slave has successfully transmitted. The Slave Write is a button widget for triggering the write
operation.
The Master Read field:
The Number of Bytes widget is an editable text field which specifies the total number of bytes that the
I2C master expects to receive. The Read Data widget is a message box which shows the content of
received data. The Receive Bytes widget is a message box which shows the total number of bytes that
the I2C master actually receives from I2C slave. The Master Read is a button widget for triggering a read
operation and data must transmit from the Slave Write at the same time in order to obtain the data.
The Slave Read field:
The Number of Bytes widget is an editable text field which specifies the total number of bytes that the
I2C slave expect to receive. The Read Data widget is a message box which shows the content of
receiving data. The Receive Bytes widget is a message box which shows the total number of bytes that
the I2C slave actually received from the I2C master. The Slave Read is a button widget for triggering a
read operation and data must transmit from the Master Write prior to the read operation.
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Android Java D2xx Demo Application for FT4222
Version: 1.0
Document Reference No.FT_001142
Clearance No.:FTDI# 437
3.4 GPIO
3.4.1
GPIO Hardware
The diagram below shows how the FT4222H GIPOs can be connected to be used with this demo.
USB
FT4222H
(GPIO)
GPIO3
GPIO2
GPIO1
GPIO0
Figure 10 GPIO Block Diagram
3.4.2
GPIO Application
Figure 11 Demo Application Screenshot – FT4222 – GPIO
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Android Java D2xx Demo Application for FT4222
Version: 1.0
Document Reference No.FT_001142
Clearance No.:FTDI# 437
The GPIO demo application provides four configurable GPIO pins and they are listed in four columns.
Each column has Input, Output, High and Low fields to control the GPIO’s direction and signal level.
From figure 8, the demo is hardwired with GPIO0 to GPIO1 and GPIO2 to GPIO3. Based on the hardware
setting, GPIO0/GPIO1 GPIO2/GPIO3 directions are mutually exclusive. In other words, changing the
GPIO0 to the output direction will automatically set GPIO1 to the input direction and vice versa. In
addition, by changing the output port signal level, the input port will automatically respond to the signal
level change. With this functional demonstration, GPIOs can be proven to work correctly on triggering bidirectional signals.
Copyright © 2015Future Technology Devices International Limited
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Android Java D2xx Demo Application for FT4222
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Clearance No.:FTDI# 437
4
Appendix A – References
http://developer.Android.com/index.html
http://www.ftdichip.com/Support/Documents/DataSheets/ICs/DS_FT4222H.pdf
http://www.ftdichip.com/Support/Documents/TechnicalNotes/TN_147_Java_D2xx_for_Android.pdf
4.1 Acronyms and Abbreviations
Terms
Description
D2xx
FTDI’s proprietary “direct” user space driver interface running ontop of Android USB Host API
OS
Operating System
USB
Universal Serial Bus
BSP
Board Supporting Package
API
Application Programming Interface
OTG
On The Go
SDK
Software Development Kit
ADT
Android Development Tools
IDE
Integrated Development Environment
ADB
Android Debug Bridge
SPI
Serial Peripheral Interface
I 2C
Inter-Integrated Circuit
GPIO
General Purpose Input/Output
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Android Java D2xx Demo Application for FT4222
Version: 1.0
Document Reference No.FT_001142
Clearance No.:FTDI# 437
5
Appendix B – List of figures
Figure 1: Android Development Configuration ............................................................ 2
Figure 2: Select “Project” – “Properties” .................................................................... 3
Figure 3: Select “Java Build Path” – “Libraries” – “Add JARs” .................................... 4
Figure 4: Select the library file – d2xx.jar .................................................................. 4
Figure 2 Demo Application Screenshot – Information ................................................ 6
Figure 3 SPI Block Diagram ........................................................................................ 7
Figure 4 Demo Application Screenshot – FT4222 –SPI ............................................... 7
Figure 5 I2C Block Diagram ......................................................................................... 9
Figure 6 Demo Application Screenshot – FT4222 I2C .................................................. 9
Figure 7 GPIO Block Diagram ................................................................................... 11
Figure 8 Demo Application Screenshot – FT4222 – GPIO .......................................... 11
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Android Java D2xx Demo Application for FT4222
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Clearance No.:FTDI# 437
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Appendix C – Revision History
Document Title:
Android D2xx API User Manual
Document Reference No.:
FT_001142
Clearance No.:
FTDI#
Drivers Page:
http://www.ftdichip.com/Drivers/D2XX.htm
Document Feedback:
Send Feedback
Revision
1.0
Changes
Initial Release
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Date
2015-01-21
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Android Java D2xx Demo Application for FT4222
Version: 1.0
Document Reference No.FT_001142
Clearance No.:FTDI# 437
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Contact Information
Branch Office – Tigard, Oregon, USA
Head Office – Glasgow, UK
Future Technology Devices International Limited
Unit 1, 2 Seaward Place, Centurion Business
Park
Glasgow G411HH
United Kingdom
Tel: +44 (0) 141 429 2777
Fax: +44 (0) 141 429 2758
E-mail (Sales)
E-mail (Support)
E-mail (General
Enquiries)
Web Site URL
Web Shop URL
[email protected]
[email protected]
[email protected]
http://www.ftdichip.com
http://www.ftdichip.com
Branch Office – Taipei, Taiwan
2F, No. 516, Sec. 1, NeiHu Road
Taipei 114
Taiwan , R.O.C.
Tel: +886 (0) 2 87913570
Fax: +886 (0) 2 8791 3576
E-mail (Sales)
E-mail (Support)
E-mail (General
Enquiries)
Web Site URL
[email protected]
[email protected]
7130 SW Fir Loop
Tigard, OR 97223-8160
USA
Tel: +1 (503) 547 0988
Fax: +1 (503) 547 0987
E-Mail (Sales)
E-Mail (Support)
E-Mail (General Enquiries)
Web Site URL
[email protected]
[email protected]
[email protected]
http://www.ftdichip.com
Branch Office – Shanghai, China
No. 666 West Huaihai Road,
Shanghai, 200052
China
Tel: +86 2162351596
Fax: +86 2162351595
E-mail (Sales)
E-mail (Support)
E-mail (General
Enquiries)
Web Site URL
[email protected]
[email protected]
[email protected]
http://www.ftdichip.com
[email protected]
http://www.ftdichip.com
Distributor and Sales Representatives
Please visit the Sales Network page of the FTDI Web site for the contact details of our distributor(s) and
sales representative(s) in your country.
System and equipment manufacturers and designers are responsible to ensure that their systems, and
any Future Technology Devices International Ltd (FTDI) devices incorporated in their systems, meet all
applicable safety, regulatory and system-level performance requirements. All application-related
information in this document (including application descriptions, suggested FTDI devices and other
materials) is provided for reference only. While FTDI has taken care to assure it is accurate, this
information is subject to customer confirmation, and FTDI disclaims all liability for system designs and for
any applications assistance provided by FTDI. Use of FTDI devices in life support and/or safety
applications is entirely at the user’s risk, and the user agrees to defend, indemnify and hold harmless
FTDI from any and all damages, claims, suits or expense resulting from such use. This document is
subject to change without notice. No freedom to use patents or other intellectual property rights is
implied by the publication of this document. Neither the whole nor any part of the information contained
in, or the product described in this document, may be adapted or reproduced in any material or electronic
form without the prior written consent of the copyright holder. Future Technology Devices International
Ltd, Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow G41 1HH, United Kingdom. Scotland
Registered Company Number: SC136640
Copyright © 2015Future Technology Devices International Limited
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