fs4412开发板点灯程序

以下是一个简单的 fs4412 开发板点灯程序的代码：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>

#define GPIO_BASE_ADDR 0x11000000
#define GPIO_SIZE 0x1000

#define LED1_OFFSET 0x880
#define LED2_OFFSET 0x890
#define LED3_OFFSET 0x8A0
#define LED4_OFFSET 0x8B0

#define LED_ON 1
#define LED_OFF 0

int main(int argc, char **argv) {
    int fd;
    void *gpio_base;
    volatile unsigned int *gpio_led1;
    volatile unsigned int *gpio_led2;
    volatile unsigned int *gpio_led3;
    volatile unsigned int *gpio_led4;

    // 打开 /dev/mem 设备
    if ((fd = open("/dev/mem", O_RDWR | O_SYNC)) < 0) {
        perror("open");
        exit(1);
    }

    // 映射 GPIO 地址
    gpio_base = mmap(NULL, GPIO_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, GPIO_BASE_ADDR);
    if (gpio_base == MAP_FAILED) {
        perror("mmap");
        exit(1);
    }

    // 获取 LED 的地址
    gpio_led1 = (volatile unsigned int *)(gpio_base + LED1_OFFSET);
    gpio_led2 = (volatile unsigned int *)(gpio_base + LED2_OFFSET);
    gpio_led3 = (volatile unsigned int *)(gpio_base + LED3_OFFSET);
    gpio_led4 = (volatile unsigned int *)(gpio_base + LED4_OFFSET);

    // 设置 LED 为输出模式
    *gpio_led1 &= ~(0x7 << 4);
    *gpio_led2 &= ~(0x7 << 4);
    *gpio_led3 &= ~(0x7 << 4);
    *gpio_led4 &= ~(0x7 << 4);
    *gpio_led1 |= (0x1 << 4);
    *gpio_led2 |= (0x1 << 4);
    *gpio_led3 |= (0x1 << 4);
    *gpio_led4 |= (0x1 << 4);

    // 循环点亮 LED
    while (1) {
        *gpio_led1 = LED_ON;
        *gpio_led2 = LED_OFF;
        *gpio_led3 = LED_OFF;
        *gpio_led4 = LED_OFF;
        usleep(500000);
        *gpio_led1 = LED_OFF;
        *gpio_led2 = LED_ON;
        *gpio_led3 = LED_OFF;
        *gpio_led4 = LED_OFF;
        usleep(500000);
        *gpio_led1 = LED_OFF;
        *gpio_led2 = LED_OFF;
        *gpio_led3 = LED_ON;
        *gpio_led4 = LED_OFF;
        usleep(500000);
        *gpio_led1 = LED_OFF;
        *gpio_led2 = LED_OFF;
        *gpio_led3 = LED_OFF;
        *gpio_led4 = LED_ON;
        usleep(500000);
    }

    // 解除映射
    munmap(gpio_base, GPIO_SIZE);

    // 关闭 /dev/mem 设备
    close(fd);

    return 0;
}

这个程序可以让 fs4412 开发板上的四个 LED 灯交替闪烁。