Sockit 硬件接口编程——点亮一个LED

1、话不多说上代码

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

void setLEDtrigger()
{
    FILE *fp;

    char trigger[] = "none";

    char dir[];

    sprintf(dir, "/sys/class/leds/fpga_led1/trigger");

    if ((fp = fopen(dir, "w")) == NULL) {
        printf("Failed to open the file %s\n", dir);
    }
    else {
        fwrite(trigger, sizeof(trigger), , fp);
        fclose(fp);
    }
}

void setLEDBrightness()
{
    FILE *fp;

    char dir[];
    char brightness_char[] = "";

    sprintf(dir, "/sys/class/leds/fpga_led1/brightness");

    if ((fp = fopen(dir, "w")) == NULL) {
        printf("Failed to open the file %s\n", dir);
    }
    else {
        fwrite(brightness_char, sizeof(brightness_char), , fp);
        fclose(fp);
    }
}

int main(int argc, char** argv)
{

    setLEDtrigger();
    setLEDBrightness();

    return ;
}

2、