Arduino LilyPad: Serial Communication Not Working

Forum 2005-2010 (read only) Hardware Interfacing
1

Hi. I have just recently configured my Eclipse to be able to work with the LilyPad (oddly enough part of the configuration I had to set the baud rate to 57600 and only works at this speed).

My problem is I have trouble getting the serial communication working. The simple code below does nothing:

void setup(void)
{
Serial.begin(9600);
Serial.print("Hello World!");
}

void loop(void) {}

Does anyone have any suggests to what may cause the serial comms to not work? Also, is there a reason to why the LilyPad only operates at 57600 in Eclipse? Thanks.

2

Because the baud rate on the arduino has to be the same as the system receiving it.

Try:
Serial.begin(57600);

instead and see if that works.

(At least, that's my guess.)

3

Nope. That did nothing as well. My code I also flash the light every second. The LED blinks fine and it seems that the LilyPad ignores the Serial.begin and Serial.print code.

4

My code I also flash the light every second.

Perhaps if you post your complete sketch..... use the # key to paste into a code window.

Lefty

5

Ok, but I'm working in Eclipse with C++.

File main.cpp

#include "application.hpp"

int main(void)
{
      Application app;
      app.run();

      return 0;
}

File application.cpp

#include "application.hpp"
#include "hardware.hpp"

//#define MAIN
#define PAUSE 300

void Application::run(void)
{
      for(;;)
            loop();
}

Application::Application()
{
      Hardware hardware;
      hardware.setup();

      Serial.begin(57600);
      Serial.print("Hello World!");
}

void Application::loop(void)
{
      #ifndef MAIN
            digitalWrite(LED_PIN, HIGH);   // set the LED on
            delay(PAUSE);                  // wait for a second
            digitalWrite(LED_PIN, LOW);    // set the LED off
            delay(PAUSE);                  // wait for a second
      #endif
}

File hardware.cpp

#include "application.hpp"
#include "hardware.hpp"

void Hardware::setup(void)
{
      pinMode(LED_PIN, OUTPUT);
}

Hardware::Hardware() {
      init();
      setup();
}

I left out the header files as they are just class abstractions.

6

Are you able to communicate with the Lilypad using a sketch compiled, linked, and uploaded using the Arduino IDE?

7

My mistake, it did work in the Arduino IDE (just didn't know how to use it). It just doesn't show up in Eclipse's console. Definitely something to do with Eclipse's configuration.

8

It looks like your Hardware::setup function gets called twice. Once, in Hardware::Hardware() and again in Application::Application().

9

You are right, I'll make the change. Thanks.

10

Do you have the clock rate and processor set appropriately in the Eclipse AVR settings? I spent HOURS trying to figure out a similar problem only to find that I had it set to the wrong speed.