stm32控制1307的代码

以下是STM32控制DS1307实时时钟模块的示例代码：

#include "stm32f10x.h"
#include "i2c.h"

#define DS1307_ADDR 0xD0

void DS1307_SetTime(uint8_t hour, uint8_t min, uint8_t sec)
{
    uint8_t buf[4];
    buf[0] = 0;
    buf[1] = Dec2Bcd(sec);
    buf[2] = Dec2Bcd(min);
    buf[3] = Dec2Bcd(hour);
    I2C_Write(DS1307_ADDR, buf, 4);
}

void DS1307_SetDate(uint8_t year, uint8_t month, uint8_t day)
{
    uint8_t buf[4];
    buf[0] = 4;
    buf[1] = Dec2Bcd(day);
    buf[2] = Dec2Bcd(month);
    buf[3] = Dec2Bcd(year);
    I2C_Write(DS1307_ADDR, buf, 4);
}

void DS1307_GetTime(uint8_t* hour, uint8_t* min, uint8_t* sec)
{
    uint8_t buf[4];
    buf[0] = 0;
    I2C_Write(DS1307_ADDR, buf, 1);
    I2C_Read(DS1307_ADDR, buf, 3);
    *sec = Bcd2Dec(buf[0] & 0x7F);
    *min = Bcd2Dec(buf[1]);
    *hour = Bcd2Dec(buf[2] & 0x3F);
}

void DS1307_GetDate(uint8_t* year, uint8_t* month, uint8_t* day)
{
    uint8_t buf[4];
    buf[0] = 4;
    I2C_Write(DS1307_ADDR, buf, 1);
    I2C_Read(DS1307_ADDR, buf, 3);
    *day = Bcd2Dec(buf[0]);
    *month = Bcd2Dec(buf[1]);
    *year = Bcd2Dec(buf[2]);
}

uint8_t Dec2Bcd(uint8_t val)
{
    return ((val / 10) << 4) | (val % 10);
}

uint8_t Bcd2Dec(uint8_t val)
{
    return ((val >> 4) * 10) + (val & 0x0F);
}

其中，`I2C_Write`和`I2C_Read`函数是通过I2C总线与DS1307进行通信的函数。`DS1307_SetTime`和`DS1307_SetDate`函数用于设置DS1307的时间和日期，`DS1307_GetTime`和`DS1307_GetDate`函数用于读取DS1307的时间和日期。`Dec2Bcd`和`Bcd2Dec`函数用于将十进制数转换为BCD码和将BCD码转换为十进制数。