Hi,
I am trying to interface my Arduino with a Aerocomm ac4790 transceiver (8N1 serial device) by sending a firmware version request, then read the response from the transcevier.
The transmit code works (I debugged it with LED/delay, and there are four 1's in the command and it flashed 4 times), but the read code is not working... Whenever I implement the read code in loop(), the program transmits the request only once (it should loop), so I gather that the read code is getting stuck for some reason.
//March 2, 2009
//Richard Beare
#include <ctype.h>
#define bit9600Delay 84
#define halfBit9600Delay 42
#define bit4800Delay 188
#define halfBit4800Delay 94
byte rx = 6;
byte tx = 7;
byte SWval;
int versionRequest[2];
void setup() {
pinMode(rx,INPUT);
pinMode(tx,OUTPUT);
pinMode(8, OUTPUT);
digitalWrite(tx,HIGH);
Serial.begin(9600);
// Set up command -> version request asks the transceiver for firmware version 0xCC 0x00 0x00
versionRequest[0] = 204; versionRequest[1] = 0; versionRequest[2] = 0;
}
void SWprint(int totalBytes, int command[])
{
byte mask;
int currentByte;
//Iterate through each byte
for (int i=0; i<totalBytes; i++) {
currentByte = command[i];
//startbit
digitalWrite(tx,LOW);
delayMicroseconds(bit9600Delay);
for (mask = 0x01; mask>0; mask <<= 1) {
if (currentByte & mask){ // choose bit
digitalWrite(tx,HIGH); // send 1
}
else{
digitalWrite(tx,LOW); // send 0
}
delayMicroseconds(bit9600Delay);
}
//stop bit
digitalWrite(tx, HIGH);
delayMicroseconds(bit9600Delay);
}
}
int SWread()
{
byte val = 0;
while (digitalRead(rx));
//wait for start bit
if (digitalRead(rx) == LOW) {
delayMicroseconds(halfBit9600Delay);
//response is four bytes
for (int offset = 0; offset < 32; offset++) {
delayMicroseconds(bit9600Delay);
val |= digitalRead(rx) << offset;
}
//wait for stop bit + extra
delayMicroseconds(bit9600Delay);
delayMicroseconds(bit9600Delay);
return val;
}
}
void loop()
{
SWprint(3, versionRequest);
int value = SWread(); // Serial.print doesnt seem to work for simple strings/ints either....
}
As well, Serial.print doesnt seem to work at all...
Any help would be greatly appreciated 
Richard Beare