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/**
******************************************************************************
* @file main.c
* @author
* @version
* @date 2024/06/28
* @brief 实现利用USART1实现和计算机进行有线通信，所以USART1需要使用2个IO口
USART1_TX -- PA9
USART1_RX -- PA10
******************************************************************************
**/
#include "stm32f4xx.h" //必须包含
#include <stdio.h>
__IO uint32_t uwTimeDisplay = 0;
uint8_t aShowTime[50] = {0};
uint8_t aShowDate[50] = {0};
RTC_InitTypeDef RTC_InitStructure;
RTC_TimeTypeDef RTC_TimeStructure;
RTC_DateTypeDef RTC_DateStructure;
//前台程序就是中断服务程序，该程序是不需要手动调用的，当中断触发之后CPU会自动跳转过来执行该函数
void USART1_IRQHandler(void)
{
uint8_t data;
//判断中断是否发生
if (USART_GetITStatus(USART1, USART_IT_RXNE) == SET)
{
//从USART1中接收一个字节
data = USART_ReceiveData(USART1); //一次只能接收一个字节
//把接收到的数据转发出去
USART_SendData(USART1,data);
}
}
//延时微秒 注意：Systick是24bit的递减计数器 约等于798915us,所以参数不可以超过这个值
void delay_us(u32 nus)
{
SysTick->CTRL = 0; // 向控制状态寄存器中写入0，目的关闭系统嘀嗒定时器
SysTick->LOAD = (nus * 21) - 1;// 指的是计数次数，定时时间 = 计数次数 * 计数周期
SysTick->VAL = 0; // 清除当前数值寄存器的值
SysTick->CTRL = 1; // 开启了定时器，并且定时器的时钟源选择了21MHZ--> 计数周期 = 1/21us
while ((SysTick->CTRL & 0x00010000)==0);//等待延时时间到达
SysTick->CTRL = 0; // 向控制状态寄存器中写入0，目的关闭系统嘀嗒定时器
}
//延时毫秒 注意：Systick是24bit的递减计数器 约等于798ms,所以参数不可以超过这个值
void delay_ms(u32 nms)
{
SysTick->CTRL = 0; // 向控制状态寄存器中写入0，目的关闭系统嘀嗒定时器
SysTick->LOAD = (nms * 21*1000) - 1;// 指的是计数次数，定时时间 = 计数次数 * 计数周期
SysTick->VAL = 0; // 清除当前数值寄存器的值
SysTick->CTRL = 1; // 开启了定时器，并且定时器的时钟源选择了21MHZ--> 计数周期 = 1/21us
while ((SysTick->CTRL & 0x00010000)==0);//等待延时时间到达
SysTick->CTRL = 0; // 向控制状态寄存器中写入0，目的关闭系统嘀嗒定时器
}
void USART1_Config(u32 baud)
{
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
//打开了GPIO端口时钟 PA9和PA10
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
//打开USART1的时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
//选择GPIO引脚的复用功能
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9 , GPIO_AF_USART1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
//配置GPIO引脚 注意：复用模式
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_10;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//配置串口参数+对串口初始化
USART_InitStructure.USART_BaudRate = baud; //波特率
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //数据位
USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位
USART_InitStructure.USART_Parity = USART_Parity_No; //无校验
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //无流控
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
USART_Init(USART1, &USART_InitStructure);
//配置NVIC参数 + 对NVIC初始化
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
//选择USART1的中断源，接收到数据则触发中断
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
//打开串口
USART_Cmd(USART1, ENABLE);
}
//利用串口发送一个字符串
void USART1_SendString(const char *str)
{
while(*str)
{
USART_SendData(USART1,*str++);
while( USART_GetFlagStatus(USART1,USART_FLAG_TXE) == RESET );
}
}
void RTC_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
PWR_BackupAccessCmd(ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = RTC_WKUP_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
EXTI_ClearITPendingBit(EXTI_Line22);
EXTI_InitStructure.EXTI_Line = EXTI_Line22;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
RCC_LSEConfig(RCC_LSE_ON);
while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET);
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
RCC_RTCCLKCmd(ENABLE);
RTC_WaitForSynchro();
RTC_TimeStructure.RTC_Hours = 0x23;
RTC_TimeStructure.RTC_Minutes = 0x59;
RTC_TimeStructure.RTC_Seconds = 0x50;
RTC_SetTime(RTC_Format_BCD, &RTC_TimeStructure);
RTC_DateStructure.RTC_Month = 0x07;
RTC_DateStructure.RTC_Date = 0x06;
RTC_DateStructure.RTC_Year = 0x24;
RTC_DateStructure.RTC_WeekDay = 0x06;
RTC_SetDate(RTC_Format_BCD, &RTC_DateStructure);
RTC_InitStructure.RTC_AsynchPrediv = 128-1;
RTC_InitStructure.RTC_SynchPrediv = 256-1;
RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
RTC_Init(&RTC_InitStructure);
RTC_WakeUpClockConfig(RTC_WakeUpClock_CK_SPRE_16bits); //采用内部时钟 = 1HZ
RTC_SetWakeUpCounter(1-1);
RTC_ITConfig(RTC_IT_WUT, ENABLE);
RTC_ClearITPendingBit(RTC_IT_WUT);
RTC_WakeUpCmd(ENABLE);
}
void RTC_WKUP_IRQHandler(void)
{
if(RTC_GetITStatus(RTC_IT_WUT) != RESET)
{
uwTimeDisplay = 1;
RTC_ClearITPendingBit(RTC_IT_WUT);
EXTI_ClearITPendingBit(EXTI_Line22);
}
}
int main()
{
//1.硬件的初始化
USART1_Config(9600);
RTC_Config();
while(1)
{
if (uwTimeDisplay == 1)
{
//显示时间
RTC_GetTime(RTC_Format_BIN, &RTC_TimeStructure);
RTC_GetDate(RTC_Format_BIN, &RTC_DateStructure);
sprintf((char*)aShowTime,"%0.2d:%0.2d:%0.2d\r\n",RTC_TimeStructure.RTC_Hours, RTC_TimeStructure.RTC_Minutes, RTC_TimeStructure.RTC_Seconds);
sprintf((char*)aShowDate,"20%0.2d-%0.2d-%0.2d\r\n",RTC_DateStructure.RTC_Year, RTC_DateStructure.RTC_Month, RTC_DateStructure.RTC_Date);
USART1_SendString((char*)aShowTime);
USART1_SendString((char*)aShowDate);
uwTimeDisplay = 0;
}
}
}
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