一个往sys/class/gpio/gpio0中写值得C语言函数德莫

以下是一个往sys/class/gpio/gpio0中写值的C语言函数示例：

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>

#define GPIO_PIN "0" // GPIO引脚编号

int write_gpio_value(int value) {
    char buffer[256];
    int fd;

    // 将GPIO引脚设为输出模式
    fd = open("/sys/class/gpio/export", O_WRONLY);
    if (fd == -1) {
        perror("Failed to open export for writing");
        return -1;
    }
    snprintf(buffer, sizeof(buffer), GPIO_PIN);
    if (write(fd, buffer, strlen(buffer)) == -1) {
        perror("Failed to export gpio");
        return -1;
    }
    close(fd);

    snprintf(buffer, sizeof(buffer), "/sys/class/gpio/gpio%s/direction", GPIO_PIN);
    fd = open(buffer, O_WRONLY);
    if (fd == -1) {
        perror("Failed to open direction for writing");
        return -1;
    }
    if (write(fd, "out", 3) == -1) {
        perror("Failed to set direction");
        return -1;
    }
    close(fd);

    // 写入GPIO值
    snprintf(buffer, sizeof(buffer), "/sys/class/gpio/gpio%s/value", GPIO_PIN);
    fd = open(buffer, O_WRONLY);
    if (fd == -1) {
        perror("Failed to open value for writing");
        return -1;
    }
    snprintf(buffer, sizeof(buffer), "%d", value);
    if (write(fd, buffer, strlen(buffer)) == -1) {
        perror("Failed to write value");
        return -1;
    }
    close(fd);

    return 0;
}

使用该函数，可以通过调用`write_gpio_value(1)`和`write_gpio_value(0)`来分别往GPIO0中写入高电平和低电平。