/*
 * avr_test.c -- a minimalistic test program for the avr toolchain
 *
 * (c) 2005, jw@suse.de
 * distributable under GPL
 *
 * Example usage:
 *
 *   rpm -i avr-libc.rpm cross-avr-gcc.rpm cross-avr-binutils.rpm uisp.rpm
 *   export PATH=/opt/cross/bin:$PATH
 *   avr-gcc -mmcu=attiny2313 avr_test.c -o avr_test.out
 *   avr-objcopy -O ihex avr_test.out avr_test.hex
 *   uisp -v -dprog=stk200 --erase --upload --verify if=avr_test.hex
 *
 * Then connect LEDs to the pins of port A and watch them blink.
 *
 * STK200
 * ------
 *  1 MOSI
 *  2 VCC
 *  3 -
 *  4 GND
 *  5 RESET
 *  6 GND
 *  7 SCK
 *  8 GND
 *  9 MISO
 * 10 GND
 * 
 * 
 * Top View:
 * +------------------------------------------------------+
 * |                   +STK200-------+                    | 
 * |                   |2  4  6  8 10|                    |
 * |                   |1  3  5  7  9|                    |
 * |                   +-----___-----+                    |
 *
 */

#include <avr/io.h>

#define DELAY 1000

int main()
{
  int i, j;

  DDRB = 0xff;	// switch all bits of port A as output.

  for (;;)
    {
      for (i = 0; i <= 0xff; i++)
	{
	  for (j = 0; j < DELAY; j++)
	    PORTB = i;
	}
    }
}