开发板mini2440led灯实现倒计时、一段时间交通灯数据存储、修改时间的功能、数据回放显示的代码

以下是实现该功能的示例代码：

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

#define GPIO_BASE       0x56000000
#define GPIO_SIZE       0x10000
#define LED_OFFSET      0x10
#define LED_ON          0
#define LED_OFF         1

#define TIME_RECORD_FILE    "time_record.txt"

volatile unsigned long *gpio_con;
volatile unsigned long *gpio_dat;

void init_gpio() {
    int fd = open("/dev/mem", O_RDWR|O_SYNC);
    if (fd < 0) {
        perror("open /dev/mem error");
        exit(-1);
    }
    gpio_con = (volatile unsigned long *)mmap(NULL, GPIO_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, GPIO_BASE);
    if (gpio_con == (volatile unsigned long *)-1) {
        perror("mmap error");
        exit(-1);
    }
    gpio_dat = gpio_con + 1;
}

void set_led(int led, int state) {
    int shift = led * 2;
    *gpio_dat &= ~(0x3 << shift);
    *gpio_dat |= (state << shift);
}

void countdown(int seconds) {
    while (seconds >= 0) {
        printf("countdown: %d seconds\n", seconds);
        sleep(1);
        seconds--;
    }
}

void record_time(time_t start_time, time_t end_time) {
    FILE *fp = fopen(TIME_RECORD_FILE, "a");
    if (fp == NULL) {
        perror("open time record file error");
        return;
    }
    fprintf(fp, "%ld %ld\n", start_time, end_time);
    fclose(fp);
}

void replay_time() {
    FILE *fp = fopen(TIME_RECORD_FILE, "r");
    if (fp == NULL) {
        perror("open time record file error");
        return;
    }
    while (!feof(fp)) {
        time_t start_time, end_time;
        fscanf(fp, "%ld %ld\n", &start_time, &end_time);
        printf("start time: %ld, end time: %ld\n", start_time, end_time);
    }
    fclose(fp);
}

int main() {
    init_gpio();

    int countdown_time = 10;
    printf("countdown %d seconds\n", countdown_time);
    countdown(countdown_time);

    time_t start_time = time(NULL);

    // 东西方向
    set_led(0, LED_ON);
    set_led(2, LED_OFF);
    sleep(5);
    set_led(0, LED_OFF);
    set_led(2, LED_ON);
    sleep(5);

    // 南北方向
    set_led(1, LED_ON);
    set_led(3, LED_OFF);
    sleep(5);
    set_led(1, LED_OFF);
    set_led(3, LED_ON);
    sleep(5);

    time_t end_time = time(NULL);
    printf("start time: %ld, end time: %ld\n", start_time, end_time);
    record_time(start_time, end_time);

    printf("replay time record:\n");
    replay_time();

    return 0;
}

这段代码包含了倒计时、交通灯状态控制、时间记录和回放等功能。其中，`countdown()`函数用于倒计时，`record_time()`函数用于记录交通灯状态的开始和结束时间，`replay_time()`函数用于回放时间记录。时间记录使用文本文件保存，每行记录一组开始和结束时间。您可以根据实际需要修改代码，例如更改倒计时时间、交通灯状态、时间记录文件名等。