基于stm32f407写出万年历的代码

以下是基于STM32F407的万年历代码，代码中使用了RTC模块和LCD显示模块。请注意，由于不知道你使用的开发板和外围设备，代码可能需要进行适当的修改才能在你的环境中运行。

#include "stm32f4xx.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_i2c.h"
#include "stm32f4xx_rtc.h"
#include "stm32f4xx_lcd.h"
#include "stdio.h"

#define I2C_SPEED               100000
#define I2C_SLAVE_ADDRESS7      0x27

#define LCD_ROWS                2
#define LCD_COLUMNS             16

#define RTC_YEAR_OFFSET         2000

RTC_TimeTypeDef RTC_TimeStructure;
RTC_DateTypeDef RTC_DateStructure;

const char *weekdays[] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
const char *months[] = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};

void init_RTC(void);
void init_I2C(void);
void init_LCD(void);
void print_LCD(char *str, uint8_t row, uint8_t column);

int main(void) {
    char buffer[20];

    init_RTC();
    init_I2C();
    init_LCD();

    while (1) {
        RTC_GetTime(RTC_Format_BIN, &RTC_TimeStructure);
        RTC_GetDate(RTC_Format_BIN, &RTC_DateStructure);

        sprintf(buffer, "%04d/%02d/%02d %s", RTC_DateStructure.RTC_Year + RTC_YEAR_OFFSET, RTC_DateStructure.RTC_Month, RTC_DateStructure.RTC_Date, weekdays[RTC_DateStructure.RTC_WeekDay]);
        print_LCD(buffer, 0, 0);

        sprintf(buffer, "%02d:%02d:%02d %s", RTC_TimeStructure.RTC_Hours, RTC_TimeStructure.RTC_Minutes, RTC_TimeStructure.RTC_Seconds, RTC_TimeStructure.RTC_H12 ? "PM" : "AM");
        print_LCD(buffer, 1, 0);
    }
}

void init_RTC(void) {
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
    PWR_BackupAccessCmd(ENABLE);

    RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);
    RCC_RTCCLKCmd(ENABLE);

    RTC_InitTypeDef RTC_InitStructure;
    RTC_InitStructure.RTC_AsynchPrediv = 0x7F;
    RTC_InitStructure.RTC_SynchPrediv = 0xFF;
    RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
    RTC_InitStructure.RTC_AutomaticWakeUp = RTC_AutomaticWakeUp_Disable;
    RTC_InitStructure.RTC_DateStruct = RTC_DateStruct_WeekDay;
    RTC_InitStructure.RTC_WakeUpClock = RTC_WakeUpClock_RTCCLK_Div16;
    RTC_InitStructure.RTC_RefClock = RTC_RefClock_LSE;
    RTC_Init(&RTC_InitStructure);

    RTC_TimeTypeDef RTC_TimeStructure;
    RTC_DateTypeDef RTC_DateStructure;

    RTC_TimeStructure.RTC_H12 = RTC_H12_AM;
    RTC_TimeStructure.RTC_Hours = 0;
    RTC_TimeStructure.RTC_Minutes = 0;
    RTC_TimeStructure.RTC_Seconds = 0;
    RTC_SetTime(RTC_Format_BIN, &RTC_TimeStructure);

    RTC_DateStructure.RTC_WeekDay = RTC_Weekday_Monday;
    RTC_DateStructure.RTC_Date = 1;
    RTC_DateStructure.RTC_Month = RTC_Month_January;
    RTC_DateStructure.RTC_Year = 0;
    RTC_SetDate(RTC_Format_BIN, &RTC_DateStructure);
}

void init_I2C(void) {
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);

    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_I2C1);
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_I2C1);

    I2C_InitTypeDef I2C_InitStructure;
    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStructure.I2C_OwnAddress1 = 0x00;
    I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_InitStructure.I2C_ClockSpeed = I2C_SPEED;
    I2C_Init(I2C1, &I2C_InitStructure);
    I2C_Cmd(I2C1, ENABLE);
}

void init_LCD(void) {
    LCD_InitTypeDef LCD_InitStructure;
    LCD_InitStructure.LCD_Rows = LCD_ROWS;
    LCD_InitStructure.LCD_Columns = LCD_COLUMNS;
    LCD_InitStructure.LCD_Mode = LCD_Mode_8Bit;
    LCD_InitStructure.LCD_DataLength = LCD_DataLength_8b;
    LCD_InitStructure.LCD_DataLines = LCD_DataLines_4;
    LCD_InitStructure.LCD_ClockPolarity = LCD_ClockPolarity_Low;
    LCD_InitStructure.LCD_ClockFrequency = LCD_ClockFrequency_128;
    LCD_InitStructure.LCD_PinsPack = LCD_PinsPack_1;
    LCD_Init(&LCD_InitStructure);

    LCD_Clear();
}

void print_LCD(char *str, uint8_t row, uint8_t column) {
    LCD_GotoXY(row, column);
    LCD_Print(str);
}