I am trying to communicate with my arduino duemilanove via an RS232 cord. I simply want to be able to send a byte (or char) to my arduino from a desktop application. The Arduino is plugging into USB COM5 on my computer. I have the RS232 plugged into COM1, and then I have pins 2 3 and 5 on the other end of the RS232 connected to arduino pins TX, RX, and GND, respectively.
I found a serial comm class for c++ at the following link:
http://playground.arduino.cc/Interfacing/CPPWindows
I have added the .h and .cpp files from the above example as Serial.h and Serial.cpp (i think the example uses SerialClass.h and SerialClass.cpp, I just changes the names).
On my arduino, I have the following code running:
// ARDUINO
char incomingByte = 0;
void setup() {
Serial.begin(9600);
}
void loop() {
// send data only when you receive data:
if (Serial.available() > 0) {
// read the incoming byte:
incomingByte = Serial.read();
// say what you got:
Serial.print("I received: ");
Serial.println(incomingByte, HEX);
}
}
And my c++ program is the following:
// C++
#include <iostream>
#include <Windows.h>
#include "Serial.h"
using namespace std;
int main(void)
{
Serial port("COM1");
char* msg = "Hello Arduino!";
int msgLen = strlen(msg);
bool writeSuccess = port.WriteData(msg, msgLen);
cout << "\n\n";
system("PAUSE");
}
When I use the Arduino's serial port viewer to see what is bring printed, I'm getting very strange values that don't match what I'm sending (as far as I can tell).
When I send "Hello Arduino!", the arduino prints the following:
I received: FFFFFFAB
I received: 3A
I received: 3A
I received: A
I received: FFFFFFFA
I received: FFFFFFEB
I received: 6D
I received: 37
I received: 15
I received: 2D
I received: 23
I received: 21
I received: FFFFFFBD
I received: 0
This does not appear to be the correct hex for "Hello Arduino!", but I have no idea why it's not correct. Does anyone have any clue what I'm doing wrong?
