STM32 RTC时钟设置
RTC移植时注意两点
（1）RTC需要中断函数。每秒中断一次，更新需要显示的标志。
（2）RTC运行中校正时间，更新RTC_CNTx时不能直接调用Time_Adjust()函数，需要开启PWR 和 BKP 时钟，且允许访问BKP域。
void RTC_SetCurrentTime(struct rtc_time *tm)
{
/* Enable PWR and BKP clocks */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
/* Allow access to BKP Domain */
PWR_BackupAccessCmd(ENABLE);
Time_Adjust(tm);
RCC_ClearFlag();
}RTC的配置代码如下：
/**
******************************************************************************
* 文件名程: bsp_rtc.c
* 作 者: 硬石嵌入式开发团队
* 版 本: V1.0
* 编写日期: 2015-10-04
* 功 能: 实时时钟底层驱动程序
******************************************************************************
* 说明：
* 本例程配套硬石stm32开发板YS-F1Pro使用。
*
* 淘宝：
* 论坛：http://www.ing10bbs.com
* 版权归硬石嵌入式开发团队所有，请勿商用。
******************************************************************************
*/
/* 包含头文件 ----------------------------------------------------------------*/
#include "bsp/usart/bsp_usartx.h"
#include "bsp/rtc/bsp_rtc.h"
/* 私有类型定义 --------------------------------------------------------------*/
/* 私有宏定义 ----------------------------------------------------------------*/
/* 私有变量 ------------------------------------------------------------------*/
/*星期，生肖用文字ASCII码*/
uint8_t const *WEEK_STR[] = {"日", "一", "二", "三", "四", "五", "六"};
uint8_t const *zodiac_sign[] = {"猪", "鼠", "牛", "虎", "兔", "龙", "蛇", "马", "羊", "猴", "鸡", "狗"};
/* 扩展变量 ------------------------------------------------------------------*/
/* 私有函数原形 --------------------------------------------------------------*/
void Time_Adjust(struct rtc_time *tm);
static uint8_t USART_Scanf(uint32_t value);
void Time_Regulate(struct rtc_time *tm);
/* 函数体 --------------------------------------------------------------------*/
/**
* 函数功能: 配置RTC秒中断的主中断优先级为1，次优先级为0
* 输入参数: 无
* 返 回 值: 无
* 说 明：无
*/
static void RTC_NVIC_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable the RTC Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = RTC_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/**
* 函数功能: 简单的延时函数
* 输入参数: time：延时时间
* 返 回 值: 无
* 说 明：无
*/
static void Delay(uint16_t time)
{
uint16_t i;
while(--time)
{
for(i=0;i<2000;i++);
}
}
/**
* 函数功能: 配置RTC
* 输入参数: 无
* 返 回 值: 1：RTC配置成功或运行正常，0：RTC无法正常使用
* 说 明：无
*/
static uint8_t RTC_Configuration(void)
{
uint32_t count=0;
/* Enable PWR and BKP clocks */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
/* Allow access to BKP Domain */
PWR_BackupAccessCmd(ENABLE);
/* Reset Backup Domain */
BKP_DeInit();
/* Enable LSE */
RCC_LSEConfig(RCC_LSE_ON);
/* Wait till LSE is ready */
while (RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET)
{
Delay(100);
count++;
if(count>4000)return 0;
}
/* Select LSE as RTC Clock Source */
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
/* Enable RTC Clock */
RCC_RTCCLKCmd(ENABLE);
/* Wait for RTC registers synchronization
* 因为RTC时钟是低速的，内环时钟是高速的，所以要同步
*/
RTC_WaitForSynchro();
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
/* Enable the RTC Second */
RTC_ITConfig(RTC_IT_SEC, ENABLE);
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
/* Set RTC prescaler: set RTC period to 1sec */
RTC_SetPrescaler(32767); /* RTC period = RTCCLK/RTC_PR = (32.768 KHz)/(32767+1) = 1HZ */
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
return 1;
}
void RTC_SetCurrentTime(struct rtc_time *tm)
{
/* Enable PWR and BKP clocks */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
/* Allow access to BKP Domain */
PWR_BackupAccessCmd(ENABLE);
Time_Adjust(tm);
RCC_ClearFlag();
}
void RTC_SetAlarmTime(struct rtc_time *tm)
{
Time_Regulate(tm);
}
/**
* 函数功能: 检查并配置RTC
* 输入参数: tm:用于读取RTC时间的结构体指针
* 返 回 值: 无
* 说 明：无
*/
uint8_t RTC_CheckAndConfig(struct rtc_time *tm)
{
/* 配置RTC秒中断的主中断优先级 */
RTC_NVIC_Config();
/*在启动时检查备份寄存器BKP_DR1，如果内容不是0xA5A5,
则需重新配置时间并询问用户调整时间*/
if (BKP_ReadBackupRegister(BKP_DR1) != 0xA5A5)
{
printf("RTC not yet configured....\n");
/* RTC Configuration */
if(RTC_Configuration()!=1)
{
return 0;
}
printf("RTC configured....\n");
/* Adjust time by users typed on the hyperterminal */
Time_Adjust(tm);
BKP_WriteBackupRegister(BKP_DR1, 0xA5A5);
}
else
{
/*启动无需设置新时钟*/
/*检查是否掉电重启*/
if (RCC_GetFlagStatus(RCC_FLAG_PORRST) != RESET)
{
printf("Power On Reset occurred....\n");
}
/*检查是否Reset复位*/
else if (RCC_GetFlagStatus(RCC_FLAG_PINRST) != RESET)
{
printf("External Reset occurred....\n");
}
printf("No need to configure RTC....\n");
/*等待寄存器同步*/
RTC_WaitForSynchro();
/*允许RTC秒中断*/
RTC_ITConfig(RTC_IT_SEC, ENABLE);
/*等待上次RTC寄存器写操作完成*/
RTC_WaitForLastTask();
}
/*定义了时钟输出宏，则配置校正时钟输出到PC13*/
#ifdef RTCClockOutput_Enable
/* Enable PWR and BKP clocks */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
/* Allow access to BKP Domain */
PWR_BackupAccessCmd(ENABLE);
/* Disable the Tamper Pin */
BKP_TamperPinCmd(DISABLE); /* To output RTCCLK/64 on Tamper pin, the tamper
functionality must be disabled */
/* Enable RTC Clock Output on Tamper Pin */
BKP_RTCOutputConfig(BKP_RTCOutputSource_CalibClock);
#endif
/* Clear reset flags */
RCC_ClearFlag();
return 1;
}
/**
* 函数功能: 时间调节实现
* 输入参数: tm：用于读取RTC时间的结构体指针
* 返 回 值: 无
* 说 明：无
*/
/**
* static
* 函数功能: 时间调整，保存在RTC时钟结构体
* 输入参数: tm：用于读取RTC时间的结构体指针
* 返 回 值: 无
* 说 明：无
*/
void Time_Regulate(struct rtc_time *tm)
{
#if 0
tm->tm_year = 2015;
tm->tm_mon = 10;
tm->tm_mday = 4;
tm->tm_hour = 10;
tm->tm_min = 15;
tm->tm_sec = 46;
#else
u32 Tmp_YY = 0xFF, Tmp_MM = 0xFF, Tmp_DD = 0xFF, Tmp_HH = 0xFF, Tmp_MI = 0xFF, Tmp_SS = 0xFF;
printf("=========================Time Settings==================\n");
printf("请输入年份(Please Set Years): 20\n");
while (Tmp_YY == 0xFF)
{
Tmp_YY = USART_Scanf(99);
}
printf("年份被设置为: 20%0.2d\n", Tmp_YY);
tm->tm_year = Tmp_YY+2000;
Tmp_MM = 0xFF;
printf("请输入月份(Please Set Months): \n");
while (Tmp_MM == 0xFF)
{
Tmp_MM = USART_Scanf(12);
}
printf("月份被设置为: %d\n", Tmp_MM);
tm->tm_mon= Tmp_MM;
Tmp_DD = 0xFF;
printf("请输入日期(Please Set Dates): \n");
while (Tmp_DD == 0xFF)
{
Tmp_DD = USART_Scanf(31);
}
printf("日期被设置为: %d\n", Tmp_DD);
tm->tm_mday= Tmp_DD;
Tmp_HH = 0xFF;
printf("请输入时钟(Please Set Hours): \n");
while (Tmp_HH == 0xFF)
{
Tmp_HH = USART_Scanf(23);
}
printf("时钟被设置为: %d\n", Tmp_HH );
tm->tm_hour= Tmp_HH;
Tmp_MI = 0xFF;
printf("请输入分钟(Please Set Minutes): \n");
while (Tmp_MI == 0xFF)
{
Tmp_MI = USART_Scanf(59);
}
printf("分钟被设置为: %d\n", Tmp_MI);
tm->tm_min= Tmp_MI;
Tmp_SS = 0xFF;
printf("请输入秒钟(Please Set Seconds): \n");
while (Tmp_SS == 0xFF)
{
Tmp_SS = USART_Scanf(59);
}
printf("秒钟被设置为: %d\n", Tmp_SS);
tm->tm_sec= Tmp_SS;
#endif
}
void Time_Adjust(struct rtc_time *tm)
{
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
/* Get time entred by the user on the hyperterminal */
Time_Regulate(tm);
/* Get wday */
GregorianDay(tm);
/* 修改当前RTC计数寄存器内容 */
RTC_SetCounter(mktimev(tm));
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
}
/**
* 函数功能: 从串口调试助手获取数字值(把ASCII码转换为数字)
* 输入参数: value 用户在超级终端中输入的数值
* 返 回 值: 输入字符的ASCII码对应的数值
* 说 明：本函数专用于RTC获取时间，若进行其它输入应用，要修改一下
*/
static uint8_t USART_Scanf(uint32_t value)
{
uint32_t index = 0;
uint32_t 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)) /*数字0到9的ASCII码为0x30至0x39*/
{
printf("Please enter valid number between 0 and 9 -->: \n");
index--;
}
}
/* 计算输入字符的ASCII码转换为数字*/
index = (tmp[1] - 0x30) + ((tmp[0] - 0x30) * 10);
/* Checks */
if (index > value)
{
printf("Please enter valid number between 0 and %d\n", value);
return 0xFF;
}
return index;
}
/**
* 函数功能: 显示当前时间值
* 输入参数: TimeVar RTC计数值，单位为 s，tm：用于读取RTC时间的结构体指针
* 返 回 值: 无
* 说 明：无
*/
void Time_Display(uint32_t TimeVar,struct rtc_time *tm)
{
static uint8_t FirstDisplay = 1;
uint32_t BJ_TimeVar;
uint8_t str[15]; // 字符串暂存
/* 把标准时间转换为北京时间*/
BJ_TimeVar =TimeVar + 8*60*60;
to_tm(BJ_TimeVar, tm);/*把定时器的值转换为北京时间*/
if((!tm->tm_hour && !tm->tm_min && !tm->tm_sec) || (FirstDisplay))
{
GetChinaCalendar((u16)tm->tm_year, (u8)tm->tm_mon, (u8)tm->tm_mday, str);
printf("今天新历：%0.2d%0.2d,%0.2d,%0.2d\n", str[0], str[1], str[2], str[3]);
GetChinaCalendarStr((u16)tm->tm_year,(u8)tm->tm_mon,(u8)tm->tm_mday,str);
printf("今天农历：%s\n", str);
if(GetJieQiStr((u16)tm->tm_year, (u8)tm->tm_mon, (u8)tm->tm_mday, str))
printf("今天农历：%s\n", str);
FirstDisplay = 0;
}
/* 输出时间戳，公历时间 */
printf(" UNIX时间戳 = %d 当前时间为: %d年(%s年) %d月 %d日 (星期%s) %0.2d:%0.2d:%0.2d\n",TimeVar,
tm->tm_year, zodiac_sign[(tm->tm_year-3)%12], tm->tm_mon, tm->tm_mday,
WEEK_STR[tm->tm_wday], tm->tm_hour,
tm->tm_min, tm->tm_sec);
}
/******************* (C) COPYRIGHT 2015-2020 硬石嵌入式开发团队 *****END OF FILE****/
RTC程序文件：http://pan.baidu.com/s/1jIzfaxo