Hello!
I'm trying to have an Arduino UNO send values to a IOIO board
(https://github.com/ytai/ioio/wiki/UART) over UART. As someone turns a
rotary encoder, I want it to send a 0 for CW, 1 for CCW, and 2 for a press.
Everything checks out in the Serial Monitor from the Arduino, but I don't
know how to read the values and parse them on the Java-end correctly. It
all comes through as seemingly random numbers, sometimes occasionally the
correct number is there.
I've tried both of these methods on the Arduino side, all of course work
fine on Arduino's Serial Monitor:
Serial.write(1);
byte data[] = {1};
Serial.write(data, 1);
Serial.println("1");
When doing Serial.write() with an integer or a byte array: on the Java
side, I just get *mostly* 255, occasionally the correct number, and
occasionally a random number in between 0 and 255:
@Override
public void connect() throws ConnectionLostException {
try{
// rx pin = 6
mUart = ioio_.openUart(RX_PIN, IOIO.INVALID_PIN, 9600, Parity.NONE,
StopBits.ONE);
mInput = mUart.getInputStream();
}
catch(ConnectionLostException e){
Log.e(TAG, "connection lost:" + e.getMessage());
ioio_.disconnect();
throw e;
}
}
@Override
public void loop(int loopCount) throws ConnectionLostException {
try{
byte[] response = new byte[1];
int read = mInput.read();
}catch(IOException e){
Log.d(TAG, "error: " + e.getMessage());
}
}
I've also tried using BufferedReaders, while passing Strings through
Serial.println, but a lot of crazy characters were getting output from the
Java side (tried encoding in both UTF-8 and ASCII).
Baud rates are matched up at 9600, and I'm on a 5v RX pin on the IOIO, and
that pin is connected to the TX pin (pin 1) on the Arduino Uno.
Does anyone point to a simple way of transmitting & receiving an integer?
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