GPIO控制led亮暗

下面是C语言编写的GPIO控制例程，实现LED的每隔一秒闪烁一次。#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <string.h>int main(void){ FILE *p=NULL; int i=0; p = fopen("/sys/class/gpio/export","w"); fprintf(p,"%d",38); fclose(p); p = fopen("/sys/class/gpio/gpio38/direction","w"); fprintf(p,"out"); fclose(p); for(i=0;i<100;i++) {  p = fopen("/sys/class/gpio/gpio38/value","w");  fprintf(p,"%d",1);  sleep(1);  fclose(p);  p = fopen("/sys/class/gpio/gpio38/value","w");  fprintf(p,"%d",0);  sleep(1);  fclose(p); } p = fopen("/sys/class/gpio/unexport","w"); fprintf(p,"%d",38); fclose(p); return 0;}分享：