I have an Arduino program that sends via Bluetooth a byte array to a Java program.
The Java program receives the data on JSSC. The array is 72 bytes long (18 floats a´ 4byte). How JSSC recognizes the end of transmission, or know that a new byte array becomes available?
In most cases, the transfer is correct. But from time to time waste is received.
I've found this example here.
This if(event.getEventValue() == 10) means an linefeed, but bytearray have no linefeeds.
Arduino:
Serial.write(bytearray, size of bytearray);
Java:
class SerialPortReader implements SerialPortEventListener {
public void serialEvent(SerialPortEvent event) {
int dataNumber = 0;
try {
if(event.isRXCHAR()){
if(event.getEventValue() >= BYTE_NUMBER){
receivedByte = usbPort.readBytes(BYTE_NUMBER);
if(receivedByte != null) {
isRequestOK = true;
byte[] myArray = new byte[FLOATSIZE];
for(int i = 0, y = 0; i < receivedByte.length; i++, y++) { //i < receivedByte.length-1
if(myArray == null) {
y = 0;
myArray = new byte[FLOATSIZE];
}
if((i + 1) % FLOATSIZE != 0) {
myArray[y] = receivedByte[i];
}
else {
myArray[y] = receivedByte[i];
receivedValue[dataNumber] = ByteBuffer.wrap(myArray).order(ByteOrder.LITTLE_ENDIAN).getFloat();
myArray = null;
dataNumber++;
}
}
}
}
}
} catch (SerialPortException e) { } ///InvocationTargetException oder NullPointerException
}//--------------------------- End of serialEvent -------------------------------------------------------------
}//--------------------------- End of SerialPortReader ------------------------------------------------------------
Can anybody help me?
Best regards Willi
P.S. This is my first question in this forum. Hopefully I have followed the rules.
