STM32F4 ST官方评估板笔记(10) - RTC实时时钟
RTC实时时钟
①NVIC_InitTypeDef NVIC_InitStructure; //结构体定义
EXTI_InitTypeDef EXTI_InitStructure;
②/* Enable the PWR clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE); //开PWR时钟
/* Allow access to RTC */
PWR_BackupAccessCmd(ENABLE); //允许访问RTC
④NVIC_Init(&NVIC_InitStructure);
频道：RTC_WKUP_IRQn;
EXTI_Init(&EXTI_InitStructure);
频道：EXTI_Line22;
模式：EXTI_Mode_Interrupt;
触发：EXTI_Trigger_Rising;
⑤第一次进行RTC配置，完成后可省略本函数。
uint32_t RTC_ReadBackupRegister(uint32_t RTC_BKP_DR);
void RTC_WriteBackupRegister(uint32_t RTC_BKP_DR, uint32_t Data)
//后备电源寄存器（可放数据，作初始化判断，16位数据宽度）
RTC_BKP_DR：
#define RTC_BKP_DR0 ((uint32_t)0x00000000)
#define RTC_BKP_DR1 ((uint32_t)0x00000001)
#define RTC_BKP_DR2 ((uint32_t)0x00000002)
#define RTC_BKP_DR3 ((uint32_t)0x00000003)
#define RTC_BKP_DR4 ((uint32_t)0x00000004)
#define RTC_BKP_DR5 ((uint32_t)0x00000005)
#define RTC_BKP_DR6 ((uint32_t)0x00000006)
#define RTC_BKP_DR7 ((uint32_t)0x00000007)
#define RTC_BKP_DR8 ((uint32_t)0x00000008)
#define RTC_BKP_DR9 ((uint32_t)0x00000009)
#define RTC_BKP_DR10 ((uint32_t)0x0000000A)
#define RTC_BKP_DR11 ((uint32_t)0x0000000B)
#define RTC_BKP_DR12 ((uint32_t)0x0000000C)
#define RTC_BKP_DR13 ((uint32_t)0x0000000D)
#define RTC_BKP_DR14 ((uint32_t)0x0000000E)
#define RTC_BKP_DR15 ((uint32_t)0x0000000F)
#define RTC_BKP_DR16 ((uint32_t)0x00000010)
#define RTC_BKP_DR17 ((uint32_t)0x00000011)
#define RTC_BKP_DR18 ((uint32_t)0x00000012)
#define RTC_BKP_DR19 ((uint32_t)0x00000013)
RTC_InitTypeDef RTC_InitStructure; //结构体定义
RTC_TimeTypeDef RTC_TimeStructure;
RTC_DateTypeDef RTC_DateStructure;
RTC_InitTypeDef RTC_InitStructure;
/* Enable the PWR clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE); //开PWR时钟
/* Allow access to RTC */
PWR_BackupAccessCmd(ENABLE); //允许进入RTC设置
/* Enable the LSE OSC */
RCC_LSEConfig(RCC_LSE_ON); //32.768kHz外部晶振作为晶振源
/* Wait till LSE is ready */
while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET){} //等待外部低速晶振就绪
/* Select the RTC Clock Source */
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); //选择晶振源
/* Enable the RTC Clock */
RCC_RTCCLKCmd(ENABLE); //开时钟
/* Wait for RTC APB registers synchronisation */
RTC_WaitForSynchro(); //等待同步
/* Set the Time */
RTC_TimeStructure
typedef struct
{
uint8_t RTC_Hours; /*!< Specifies the RTC Time Hour. //时
This parameter must be set to a value in the 0-12 range
if the RTC_HourFormat_12 is selected or 0-23 range if
the RTC_HourFormat_24 is selected. */
uint8_t RTC_Minutes; /*!< Specifies the RTC Time Minutes. //分
This parameter must be set to a value in the 0-59 range. */
uint8_t RTC_Seconds; /*!< Specifies the RTC Time Seconds. //秒
This parameter must be set to a value in the 0-59 range. */
uint8_t RTC_H12; /*!< Specifies the RTC AM/PM Time. //上午还是下午（12小时制用）
This parameter can be a value of @ref RTC_AM_PM_Definitions */
#define RTC_H12_AM ((uint8_t)0x00)
#define RTC_H12_PM ((uint8_t)0x40)
}RTC_TimeTypeDef;
/* Set the Date */
RTC_DateStructure
typedef struct
{
uint8_t RTC_WeekDay; /*!< Specifies the RTC Date WeekDay.
This parameter can be a value of @ref RTC_WeekDay_Definitions */
#define RTC_Weekday_Monday ((uint8_t)0x01)
#define RTC_Weekday_Tuesday ((uint8_t)0x02)
#define RTC_Weekday_Wednesday ((uint8_t)0x03)
#define RTC_Weekday_Thursday ((uint8_t)0x04)
#define RTC_Weekday_Friday ((uint8_t)0x05)
#define RTC_Weekday_Saturday ((uint8_t)0x06)
#define RTC_Weekday_Sunday ((uint8_t)0x07)
uint8_t RTC_Month; /*!< Specifies the RTC Date Month (in BCD format).
This parameter can be a value of @ref RTC_Month_Date_Definitions */
#define RTC_Month_January ((uint8_t)0x01)
#define RTC_Month_February ((uint8_t)0x02)
#define RTC_Month_March ((uint8_t)0x03)
#define RTC_Month_April ((uint8_t)0x04)
#define RTC_Month_May ((uint8_t)0x05)
#define RTC_Month_June ((uint8_t)0x06)
#define RTC_Month_July ((uint8_t)0x07)
#define RTC_Month_August ((uint8_t)0x08)
#define RTC_Month_September ((uint8_t)0x09)
#define RTC_Month_October ((uint8_t)0x10)
#define RTC_Month_November ((uint8_t)0x11)
#define RTC_Month_December ((uint8_t)0x12)
uint8_t RTC_Date; /*!< Specifies the RTC Date.
This parameter must be set to a value in the 1-31 range. */
uint8_t RTC_Year; /*!< Specifies the RTC Date Year.
This parameter must be set to a value in the 0-99 range. */
}RTC_DateTypeDef;
/* Calendar Configuration */
RTC_InitStructure
typedef struct
{
uint32_t RTC_HourFormat; /*!< Specifies the RTC Hour Format.
This parameter can be a value of @ref RTC_Hour_Formats */
#define RTC_HourFormat_24 ((uint32_t)0x00000000) √
#define RTC_HourFormat_12 ((uint32_t)0x00000040)
uint32_t RTC_AsynchPrediv; /*!< Specifies the RTC Asynchronous Predivider value.
This parameter must be set to a value lower than 0x7F */ //7F
uint32_t RTC_SynchPrediv; /*!< Specifies the RTC Synchronous Predivider value.
This parameter must be set to a value lower than 0x7FFF */ //FF
}RTC_InitTypeDef;
ErrorStatus RTC_Init(RTC_InitTypeDef* RTC_InitStruct); //初始化时钟
ErrorStatus RTC_SetTime(uint32_t RTC_Format, RTC_TimeTypeDef* RTC_TimeStruct);
ErrorStatus RTC_SetDate(uint32_t RTC_Format, RTC_DateTypeDef* RTC_DateStruct);
void RTC_WakeUpClockConfig(uint32_t RTC_WakeUpClock); //RTC唤醒分频
* @param RTC_WakeUpClock: Wakeup Clock source.
* This parameter can be one of the following values:
* @arg RTC_WakeUpClock_RTCCLK_Div16: RTC Wakeup Counter Clock = RTCCLK/16√
* @arg RTC_WakeUpClock_RTCCLK_Div8: RTC Wakeup Counter Clock = RTCCLK/8
* @arg RTC_WakeUpClock_RTCCLK_Div4: RTC Wakeup Counter Clock = RTCCLK/4
* @arg RTC_WakeUpClock_RTCCLK_Div2: RTC Wakeup Counter Clock = RTCCLK/2
* @arg RTC_WakeUpClock_CK_SPRE_16bits: RTC Wakeup Counter Clock = CK_SPRE
* @arg RTC_WakeUpClock_CK_SPRE_17bits: RTC Wakeup Counter Clock = CK_SPRE
void RTC_SetWakeUpCounter(uint32_t RTC_WakeUpCounter); //唤醒计数0x7FF
/* Enable the Wakeup Interrupt */
RTC_ITConfig(RTC_IT_WUT, ENABLE); //注册唤醒中断
/* Enable Wakeup Counter */
RTC_WakeUpCmd(ENABLE); //使能唤醒
/* Backup SRAM ***************************************************************/
/* Enable BKPRAM Clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_BKPSRAM, ENABLE); //使能备用存储器时钟
/* Enable the Backup SRAM low power Regulator to retain it's content in VBAT mode */
PWR_BackupRegulatorCmd(ENABLE); //允许备用电池hold住SRAM
/* Wait until the Backup SRAM low power Regulator is ready */
while(PWR_GetFlagStatus(PWR_FLAG_BRR) == RESET){} //等待备用存储器就绪
⑥/* Wait for RTC APB registers synchronisation */
RTC_WaitForSynchro(); //等待同步
RTC_ClearITPendingBit(RTC_IT_WUT); //清除唤醒中断
EXTI_ClearITPendingBit(EXTI_Line22); //清除中断线
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_BKPSRAM, ENABLE); //开备用存储器时钟
⑦void RTC_WKUP_IRQHandler(void) //RTC中断服务
{
if(RTC_GetITStatus(RTC_IT_WUT) != RESET)
{
/* Toggle on LED1 */
LED_Toggle(orange);
RTC_ClearITPendingBit(RTC_IT_WUT); //清除唤醒中断
EXTI_ClearITPendingBit(EXTI_Line22); //清除中断线
}
}
⑧void RTC_GetTime(uint32_t RTC_Format, RTC_TimeTypeDef* RTC_TimeStruct); //获得时间
void RTC_GetDate(uint32_t RTC_Format, RTC_DateTypeDef* RTC_DateStruct); //获得日期
ErrorStatus RTC_SetDate(uint32_t RTC_Format, RTC_DateTypeDef* RTC_DateStruct); //设定日期
ErrorStatus RTC_SetTime(uint32_t RTC_Format, RTC_TimeTypeDef* RTC_TimeStruct); //设定时间