How to Enable I2C of Raspberry Pi3 module (Using with Android Things as an OS)

Question

I am trying to develop a sample Android-Things app using Raspberry Pi module 3 which takes temperature reading from BME280 sensor and display it on app. I have downloaded the sample project but facing an issue while opening I2cDevice with an address.

Below are the code details:

private static final int ADDRESS = 0x76;

private void printDeviceId() {
    List<String> deviceList = managerService.getI2cBusList();
    if (deviceList.isEmpty()) {
        Log.i(TAG, "No I2C bus available on this device.");
    } else {
        Log.i(TAG, "List of available devices: " + deviceList);
    }
    I2cDevice device = null;
    try {
        device = managerService.openI2cDevice(deviceList.get(0), ADDRESS);
        Log.d(TAG, "Device ID byte: 0x" + Integer.toHexString(device.readRegByte(0xD0)));
    } catch (IOException|RuntimeException e) {
        Log.e(TAG, e.getMessage(), e);
    } finally {
        try {
            device.close();
        } catch (Exception ex) {
            Log.d(TAG, "Error closing device");
        }
    }
}

Actually its crashing on openI2cDevice method while deviceList have only one device i.e. deviceList.get(0) is "I2C1"

Here is the crash log: android.os.ServiceSpecificException: I/O error (code 5) com.google.android.things.pio.PioException: android.os.ServiceSpecificException: I/O error (code 5) at com.google.android.things.pio.I2cDeviceImpl.readRegByte(I2cDeviceImpl.java:81) at com.example.pitepmerature.MainActivity.printDeviceId(MainActivity.java:92) at com.example.pitepmerature.MainActivity.onCreate(MainActivity.java:34) at android.app.Activity.performCreate(Activity.java:7000) at android.app.Activity.performCreate(Activity.java:6991) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856) at android.app.ActivityThread.-wrap11(Unknown Source:0) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6494) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) Caused by: android.os.ServiceSpecificException: I/O error (code 5) at android.os.Parcel.readException(Parcel.java:2018) at android.os.Parcel.readException(Parcel.java:1950) at com.google.android.things.pio.IPeripheralManagerClient$Stub$Proxy.I2cReadRegByte(IPeripheralManagerClient.java:1301) at com.google.android.things.pio.I2cDeviceImpl.readRegByte(I2cDeviceImpl.java:79) at com.example.pitepmerature.MainActivity.printDeviceId(MainActivity.java:92) at com.example.pitepmerature.MainActivity.onCreate(MainActivity.java:34) at android.app.Activity.performCreate(Activity.java:7000) at android.app.Activity.performCreate(Activity.java:6991) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)

I tried changing address to 0x77 as well but didn't work. Also gone through many blogs but didn't find the fix.

Blog link which i preferred to code and setup everything:

http://zenandroid.io/writing-a-driver-for-android-things-bme280-humidity-sensor/

Please help.

Try to access to BME280 sensor with PIO CLI Tool: pio i2c I2C1 0x12 read-reg-byte 0x76. May be issue is in circuit. — Andrii Omelchenko
@AndriiOmelchenko: I tried to hit the pio command but got the issue rpi3:/ $ pio i2c I2C1 0x12 read-reg-byte 0x76 [WARNING:client_errors.cc(35)] error 5: I/O error — Siddharth Yadav

Siddharth Yadav Siddharth Yadav · Accepted Answer · 2017-12-22T05:29:42

Thanks everyone for the helpful comments. I finally found the solution, actually the problem was with the sample I was executing. Also, i have figured-out the correct pin configuration. Here is the sample project git link:

https://github.com/androidthings/drivers-samples/tree/master/bmx280

Also, check the pin diagram I followed

How to Enable I2C of Raspberry Pi3 module (Using with Android Things as an OS)

1 Answers