写一个用STM32单片机控制DS1302时钟模块的程序

以下是一个简单的用STM32单片机控制DS1302时钟模块的程序，供参考：

#include "stm32f10x.h"
#include "ds1302.h"

void delay_us(u16 n) {
    u8 i;
    while(n--) {
        i = 10;
        while(i--) {
            asm("NOP");
        }
    }
}

void DS1302_GPIO_Configuration(void) {
    GPIO_InitTypeDef GPIO_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void DS1302_Init(void) {
    DS1302_GPIO_Configuration();
    DS1302_RST = 0;
    DS1302_CE = 0;
}

void DS1302_SendByte(u8 byte) {
    u8 i;
    for(i = 0; i < 8; i++) {
        DS1302_SCLK = 0;
        if(byte & 0x01) {
            DS1302_IO = 1;
        } else {
            DS1302_IO = 0;
        }
        byte >>= 1;
        DS1302_SCLK = 1;
    }
}

u8 DS1302_RecvByte(void) {
    u8 i, byte;
    for(i = 0; i < 8; i++) {
        byte >>= 1;
        if(DS1302_IO) {
            byte |= 0x80;
        }
        DS1302_SCLK = 0;
        DS1302_SCLK = 1;
    }
    return byte;
}

void DS1302_WriteByte(u8 addr, u8 byte) {
    DS1302_CE = 0;
    DS1302_RST = 1;
    DS1302_SendByte(addr);
    DS1302_SendByte(byte);
    DS1302_CE = 1;
}

u8 DS1302_ReadByte(u8 addr) {
    u8 byte;
    DS1302_CE = 0;
    DS1302_RST = 1;
    DS1302_SendByte(addr | 0x01);
    byte = DS1302_RecvByte();
    DS1302_CE = 1;
    return byte;
}

void DS1302_SetTime(u8 year, u8 month, u8 date, u8 week, u8 hour, u8 minute, u8 second) {
    DS1302_WriteByte(0x8e, 0x00);
    DS1302_WriteByte(0x80, second);
    DS1302_WriteByte(0x82, minute);
    DS1302_WriteByte(0x84, hour);
    DS1302_WriteByte(0x86, week);
    DS1302_WriteByte(0x88, date);
    DS1302_WriteByte(0x8c, month);
    DS1302_WriteByte(0x8a, year);
    DS1302_WriteByte(0x8e, 0x80);
}

void DS1302_GetTime(u8 *year, u8 *month, u8 *date, u8 *week, u8 *hour, u8 *minute, u8 *second) {
    *second = DS1302_ReadByte(0x81);
    *minute = DS1302_ReadByte(0x83);
    *hour = DS1302_ReadByte(0x85);
    *week = DS1302_ReadByte(0x87);
    *date = DS1302_ReadByte(0x89);
    *month = DS1302_ReadByte(0x8d);
    *year = DS1302_ReadByte(0x8b);
}

int main(void) {
    u8 year, month, date, week, hour, minute, second;

    DS1302_Init();
    DS1302_SetTime(21, 5, 1, 7, 10, 30, 0);

    while(1) {
        DS1302_GetTime(&year, &month, &date, &week, &hour, &minute, &second);
        delay_us(1000);
    }
}

需要注意的是，该程序中使用了一个名为`ds1302.h`的头文件，其中包含了DS1302所需的各种宏定义和函数声明。具体内容如下：

#ifndef __DS1302_H
#define __DS1302_H

#include "stm32f10x.h"

#define DS1302_RST PAout(1)
#define DS1302_CE  PAout(2)
#define DS1302_IO  PAout(3)
#define DS1302_SCLK PAout(4)

void delay_us(u16 n);
void DS1302_GPIO_Configuration(void);
void DS1302_Init(void);
void DS1302_SendByte(u8 byte);
u8 DS1302_RecvByte(void);
void DS1302_WriteByte(u8 addr, u8 byte);
u8 DS1302_ReadByte(u8 addr);
void DS1302_SetTime(u8 year, u8 month, u8 date, u8 week, u8 hour, u8 minute, u8 second);
void DS1302_GetTime(u8 *year, u8 *month, u8 *date, u8 *week, u8 *hour, u8 *minute, u8 *second);

#endif

其中，`delay_us`是一个us级延时函数，`DS1302_GPIO_Configuration`用于配置DS1302所需的GPIO口，`DS1302_Init`用于初始化DS1302，`DS1302_SendByte`和`DS1302_RecvByte`用于发送和接收一个字节的数据，`DS1302_WriteByte`和`DS1302_ReadByte`用于写入和读取DS1302的寄存器，`DS1302_SetTime`和`DS1302_GetTime`用于设置和获取DS1302的时间。