/******************************************************************
 * Compile: gcc -o fade1 -Wall -I/usr/local/include -L/usr/local/lib 
 *          fade1.c -lwiringPi
 * 
 * Execute: sudo ./fade1
 *
 * All pin numbers are wiringPi numbers unless otherwise specified.
 ******************************************************************/

#include <wiringPi.h>

int main()
{
  wiringPiSetup();              // Setup required by wiringPi

  pinMode (1, PWM_OUTPUT);      // 
  pwmSetMode(PWM_MODE_MS);      // Mark/Space mode
 
  int i;
 
  while(1)
  {
    for (i = 255; i > -1; i--)
    {
      pwmWrite(1, i);
      delay(10);
    } 

    for (i = 0; i < 256; i++)
    {
      pwmWrite(1, i);
      delay(10);
    }
  }
}