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QT USB BITBANG Mode example for Android using FTDI D2XX driver

This is a QT example for using the FTDI D2xx driver (j2xx.jar) on Android devices. It just can send a value on “Channel A” and receive a value on “Channel B” via the FT2232H chipset.

Overview

Overview
Just connect your FTDI Chip with an USB OTG adapter to your Android device. To test the application, connect the Channel A and Channel B (see table) with a jumper cable.

Signal
Channel A		 FT2232H pin Signal
Channel A		 FT2232H pin
D0 2 D0 38
D1 3 D1 39
D2 6 D2 40
D3 9 D3 41
D4 1 D4 42
D5 5 D5 43
D6 10 D6 44
D7 11 D7 45

Some information about the code

I wrote two classes. The QT Class MainWindow and the JAVA Class MyFTDIClass.


I have encapsulated the control of the FTDI driver (j2xx.jar) in its own JAVA class (MyFTDIClass), this has the advantage that I don't have to pass the objects D2xxManager and FT_Device to my MainWindow class via JNI. I only provide the Init, Read and Write methods, which I can easily call using the "QAndroidJniObject::callStaticMethod" Method.


AndroidManifest.xml

Changes to the Manifest file

<activity
 android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation"
	 android:name="org.usbexample.ftdi.MyFTDIClass"
	 android:label="-- %%INSERT_APP_NAME%% --"
	 android:screenOrientation="unspecified"
	 android:launchMode="singleTop">



<uses-feature android:name="android.hardware.usb.host"/>
    <intent-filter>
      <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"/>
    </intent-filter>
    <meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" android:resource="@xml/device_filter"/>

You have to change the android:name to

android:name="org.usbexample.ftdi.MyFTDIClass"

QT Projekt File

For using the QAndroidJniObject, you have to add androidextras:

QT += core gui androidextras

in your project file (usbexample.pro)