led_test

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
//调用驱动

int fd;
int value = 0;

fd = open("/dev/led0", O_RDWR);
if(fd < 0)
{
perror("open");
exit(1);
}

read(fd, &value, 4);

printf("___USER___: value = %d\n", value);

//应用程序去控制灯到亮和灭

while(1)
{
value = 0;
write(fd, &value, 4);
sleep(1);

value = 1;
write(fd, &value, 4);
sleep(1);

}

close(fd);

return 0;

}