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標題: STM32學習手記⑨-RTC實時時鐘 [打印本頁]

作者: daming 時間: 2014-12-30 00:45
標題: STM32學習手記⑨-RTC實時時鐘

#include "stm32f10x_lib.h"

#include"stdio.h"

vu32 TimeDisplay = 0;

void RCC_Configuration()

{

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO | RCC_APB2Periph_USART1 , ENABLE); //打開APB2外設

RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE); //使能電源時鐘和備份區時鐘

}

void NVIC_Configuration( )

{

NVIC_InitTypeDef NVIC_InitStructure; //定義一個中斷結構體

NVIC_InitStructure.NVIC_IRQChannel = RTC_IRQChannel;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); //無搶占式優先級

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //響應優先級為0

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

}

void GPIO_Configuration()

{

GPIO_InitTypeDef GPIO_InitStructure; //定義GPIO初始化結構體

//--------將USART1 的TX 配置為復用推挽輸出 AF_PP---------------------//

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9; //管腳位置定義，標號可以是NONE、ALL、0至15。

GPIO_InitStructure.GPIO_Speed=GPIO_Speed_2MHz; //輸出速度2MHz

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP; //推挽輸出模式 Out_PP

GPIO_Init(GPIOA,&GPIO_InitStructure); //E組GPIO初始化

//--------將USART1 的RX 配置為浮空輸入 IN_FLOATING---------------------//

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10; //管腳位置定義

//輸入模式下配置輸出速度無意義

//GPIO_InitStructure.GPIO_Speed=GPIO_Speed_2MHz; //輸出速度2MHz

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING; //浮空輸入 IN_FLOATING

GPIO_Init(GPIOA,&GPIO_InitStructure); //C組GPIO初始化

}

void USART1_Configuration( )

{

USART_InitTypeDef USART_InitStructure; //串口設置恢復默認參數

USART_ClockInitTypeDef USART_ClockInitStructure;

USART_InitStructure.USART_BaudRate = 115200; //波特率115200

USART_InitStructure.USART_WordLength = USART_WordLength_8b; //字長8位

USART_InitStructure.USART_StopBits = USART_StopBits_1; //1位停止字節

USART_InitStructure.USART_Parity = USART_Parity_No; //無奇偶校驗

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //無流控制

USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //打開Rx接收和Tx發送功能

USART_Init(USART1, &USART_InitStructure); //初始化

USART_Cmd(USART1, ENABLE); //啟動串口

//-----如下語句解決第1個字節無法正確發送出去的問題-----//

USART_ClearFlag(USART1, USART_FLAG_TC); // 清標志

}

void RTC_Configuration(void)

{

PWR_BackupAccessCmd(ENABLE); //取消備份區寫保護（寫保護在每次硬件復位后被使能）

BKP_DeInit(); //備份區恢復默認

RCC_LSEConfig(RCC_LSE_ON); //LSE(外部低速振蕩時鐘)打開

while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET); //等待LSE準備就緒

RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); //將LSE作為RTC時鐘

RCC_RTCCLKCmd(ENABLE); //RTC時鐘打開

RTC_WaitForSynchro(); //等待RTC寄存器同步

RTC_WaitForLastTask(); //對RTC任何寄存器的操作，都必須在前一次寫操作完成后執行

RTC_ITConfig(RTC_IT_SEC, ENABLE); //使能秒中斷

RTC_WaitForLastTask(); //對RTC任何寄存器的操作，都必須在前一次寫操作完成后執行

RTC_SetPrescaler(32767); //對RTC時鐘分頻 32.768K/(32767+1)=1Hz

RTC_WaitForLastTask(); //對RTC任何寄存器的操作，都必須在前一次寫操作完成后執行

}

u8 USART_Scanf(u32 value)

{

u32 index = 0;

u32 tmp[2] = {0, 0};

while(index < 2)

{

/* Loop until RXNE = 1 */

while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);

tmp[index++] = (USART_ReceiveData(USART1));

if((tmp[index - 1] < 0x30) || (tmp[index - 1] > 0x39))

{

printf("\n\rPlease enter valid number between 0 and 9");

index--;

}

/* Calculate the Corresponding value */

index = (tmp[1] - 0x30) + ((tmp[0] - 0x30) * 10);

/* Checks */

if(index > value)

{

printf("\n\rPlease enter valid number between 0 and %d", value);

return 0xFF;

}

return index;

}

u32 Time_Regulate(void)

{

u32 Tmp_HH = 0xFF, Tmp_MM = 0xFF, Tmp_SS = 0xFF;

printf("\r\n==============Time Settings=====================================");

printf("\r\n Please Set Hours");

while(Tmp_HH == 0xFF)

{

Tmp_HH = USART_Scanf(23);

}

printf(": %d", Tmp_HH);

printf("\r\n Please Set Minutes");

while(Tmp_MM == 0xFF)

{

Tmp_MM = USART_Scanf(59);

}

printf(": %d", Tmp_MM);

printf("\r\n Please Set Seconds");

while(Tmp_SS == 0xFF)

{

Tmp_SS = USART_Scanf(59);

}

printf(": %d", Tmp_SS);

/* Return the value to store in RTC counter register */

return((Tmp_HH*3600 + Tmp_MM*60 + Tmp_SS));

}

void Time_Adjust(void)

{

RTC_WaitForLastTask(); //對RTC任何寄存器的操作，都必須在前一次寫操作完成后執行

RTC_SetCounter(Time_Regulate()); //設置計數值

RTC_WaitForLastTask(); //對RTC任何寄存器的操作，都必須在前一次寫操作完成后執行

}

void Time_Display(u32 TimeVar)

{

u32 THH = 0, TMM = 0, TSS = 0;

THH = TimeVar/3600; //計算小時

TMM = (TimeVar % 3600)/60;//計算分

TSS = (TimeVar % 3600)% 60; //計算秒

printf("Time: %0.2d:%0.2d:%0.2d\r\n",THH, TMM, TSS);

}

void Time_Show(void)

{

while(1) //infinite loop

{

if(TimeDisplay == 1) //if 1s has passed

{

Time_Display(RTC_GetCounter()); //display current time

TimeDisplay = 0;

}

int fputc(int ch, FILE *f) //在源代碼中添加fputc函數，可以用printf函數做為調試輸出

{

/* 將Printf內容發往串口 */

USART_SendData(USART1, (u8) ch);

/* 循環，直到傳送完成 */

while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);

return ch;

}

int main()

{

RCC_Configuration();

GPIO_Configuration();

NVIC_Configuration( );

USART1_Configuration();

if (BKP_ReadBackupRegister(BKP_DR1) != 0xA5A5){ //檢查是否第一次配置RTC

printf("\r\n\n RTC not yet configured....");

RTC_Configuration();

printf("\r\n RTC configured....");

Time_Adjust();

BKP_WriteBackupRegister(BKP_DR1, 0xA5A5);

}

else{

if(RCC_GetFlagStatus(RCC_FLAG_PORRST) != RESET) //檢查是否是上電復位

{

printf("\r\n\n Power On Reset occurred....");

}

else if(RCC_GetFlagStatus(RCC_FLAG_PINRST) != RESET) //檢查是否是復位腳復位

{

printf("\r\n\n External Reset occurred....");

}

printf("\r\n No need to configure RTC....");

RTC_WaitForSynchro();

RTC_ITConfig(RTC_IT_SEC, ENABLE);

RTC_WaitForLastTask();

}

RCC_ClearFlag(); //清除復位標志

Time_Show();

}

//秒中斷函數，在 stm32f10x_it.c 里

void RTC_IRQHandler(void)

{

if(RTC_GetITStatus(RTC_IT_SEC) != RESET) //判斷是否是秒中斷

{

RTC_ClearITPendingBit(RTC_IT_SEC); //清除RTC秒中斷標志

TimeDisplay = 1; //將標志位置1，代表1s過去

RTC_WaitForLastTask(); //wait until last write operation on RTC regisiters has finished

if(RTC_GetCounter() == 0x00015180) //reset RTC counter when time is 23:59:59

{

RTC_SetCounter(0x0);

RTC_WaitForLastTask(); //wait until last write operation on RTC regisiters has finished

}

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