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119 | package io.fabo.uartexample;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import com.google.android.things.pio.PeripheralManager;
import com.google.android.things.pio.UartDevice;
import com.google.android.things.pio.UartDeviceCallback;
import java.io.IOException;
import java.util.List;
public class MainActivity extends Activity {
// UART Device Name
private UartDevice mDevice;
private static final String TAG = "UART";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Attempt to access the UART device
try {
PeripheralManager manager = PeripheralManager.getInstance();
mDevice = manager.openUartDevice(BoardDefaults.getUartName());
configureUartFrame(mDevice);
mDevice.registerUartDeviceCallback(mUartCallback);
// Send command.
byte[] buffer = {(byte)0x63};
writeUartData(mDevice, buffer);
} catch (IOException e) {
Log.w(TAG, "Unable to access UART device", e);
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (mDevice != null) {
try {
mDevice.close();
mDevice = null;
} catch (IOException e) {
Log.w(TAG, "Unable to close UART device", e);
}
}
}
/**
* Configure the UART port.
* @param uart
* @throws IOException
*/
public void configureUartFrame(UartDevice uart) throws IOException {
uart.setBaudrate(9600);
uart.setDataSize(8);
uart.setParity(UartDevice.PARITY_NONE);
uart.setStopBits(1);
}
/**
* Callback.
*/
private UartDeviceCallback mUartCallback = new UartDeviceCallback() {
@Override
public boolean onUartDeviceDataAvailable(UartDevice uart) {
try {
readUartBuffer(uart);
} catch (IOException e) {
Log.w(TAG, "Unable to access UART device", e);
}
return true;
}
@Override
public void onUartDeviceError(UartDevice uart, int error) {
Log.w(TAG, uart + ": Error event " + error);
}
};
/**
* Read uart buffer.
* @param uart
* @throws IOException
*/
public void readUartBuffer(UartDevice uart) throws IOException {
final int maxCount = 8;
byte[] buffer = new byte[maxCount];
int count;
while ((count = uart.read(buffer, buffer.length)) > 0) {
Log.d(TAG, "Read " + count + " bytes from peripheral");
}
for(int i = 0; i < buffer.length; i++) {
Log.d(TAG, i + ":0x" + Integer.toHexString(buffer[i]&0xff));
}
}
/**
* Write uart.
* @param uart
* @param command
* @throws IOException
*/
public void writeUartData(UartDevice uart, byte[] command) throws IOException {
int count = uart.write(command, command.length);
for(int i = 0; i < count; i++) {
Log.d(TAG, i + ":0x" + Integer.toHexString(command[i]&0xff));
}
}
}
|