text: #include <stdio.h>
  #include <stdint.h>
  #include <unistd.h>
  #include "backlight.h"
  
  #define	BACKLIGHT	"/sys/class/backlight/backlight/brightness"
  #define	LOW_LEVEL	30
  int main(int argc, char *argv[])
  {
  	int c = 100;
  	static uint16_t level = LOW_LEVEL;
  
  	while(c--) {
  		level += 10;
  		if (level >= 255) {
  			level = LOW_LEVEL;
  		}
  		printf("setting bl level:%d\n", level);
  		set_backlight(BACKLIGHT, level);
  		usleep(100*1000);
  	}
  
  	return 0;
  }
  