Documentation Talk:NGW/NGW100 LEDs

From AVRFreaks Wiki

HI, here a sample code to do it in C

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h> 
#include <fcntl.h>
int main(int argc, char** argv)
{
   printf("--Blinking leds on ngw100 using led classe from kernel--\n");
  
   FILE *fp;
   fp = fopen("/sys/class/leds/a/brightness","a"); // open file in ascii mode
   if ( fp == NULL)
   {
      perror("fopen()");
      exit(1);
   }
   while (1)
   {
      if ( 255 == fputc('1',fp))  // 1 lit up the A led
      {
         perror("fprintf()\n");
      }     
      fflush(NULL);   // Empty the internal file buffer
      sleep(1);   // wait 1 second
      if ( 255 == fputc('0',fp)) // unlit the led
      {
          perror("fprintf()\n");
      } 
      fflush(NULL);
      sleep(1);
   }
  
   return 0;
}