STM32开发笔记76: 初始化RTC后死机的原因

项目开发中只要初始化RTC，则系统死机。其初始化步骤可参考日志：STM32开发笔记44：RTC驱动程序的移植。按照日志STM32开发笔记75: 使用STM32CubeMX点亮一个LED使用STM32CubeMX直接生成程序则运行正常。

分析原因在于，少移植了2个函数：HAL_RTC_MspInit和HAL_RTC_MspDeInit。这两个函数的实现非常简单，可以靠STM32CubeMX直接生成。

void HAL_RTC_MspInit(RTC_HandleTypeDef *hrtc)

{

  __HAL_RCC_RTC_ENABLE();

  HAL_NVIC_SetPriority(RTC_IRQn, 0x0, 0);

  HAL_NVIC_EnableIRQ(RTC_IRQn);

}

void HAL_RTC_MspDeInit(RTC_HandleTypeDef *hrtc)

{

   __HAL_RCC_RTC_DISABLE();

}

将这2个函数直接植入rtc.cpp即可，这样就得到了完善的rtc.h和rtc.cpp。

#ifndef RTC_H_

#define RTC_H_

#include "stdint.h"

#if (defined STM32F091xC) || (defined STM32F070x6)

#include "stm32f0xx_hal.h"

#elif (defined STM32L053xx)

#include "stm32l0xx_hal.h"

#endif

#ifdef __cplusplus

extern "C"{

class CRtc

{

public:

RTC_HandleTypeDef hRTC;

public:

CRtc(void);

void EnterStopRtcMode(uint8_t u8_Second);

};

}

#endif

#endif

#include "include.h"

RTC_HandleTypeDef* pRTC = NULL;

CRtc::CRtc(void)

{

  this->hRTC.Instance = RTC;

pRTC = &this->hRTC;

this->hRTC.Init.HourFormat = RTC_HOURFORMAT_24;

this->hRTC.Init.AsynchPrediv = 124;

this->hRTC.Init.SynchPrediv = 295;

this->hRTC.Init.OutPut = RTC_OUTPUT_DISABLE;

this->hRTC.Init.OutPutRemap = RTC_OUTPUT_REMAP_NONE; //不进行输出引脚重映射

this->hRTC.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;

this->hRTC.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;

if (HAL_RTC_Init(&this->hRTC) != HAL_OK)

{

Target.ErrorHandler(__FILE__, __LINE__);

}

}

void CRtc::EnterStopRtcMode(uint8_t u8_Second)

{

HAL_RTCEx_DeactivateWakeUpTimer(&hRTC);    

  HAL_RTCEx_SetWakeUpTimer_IT(&hRTC, (uint32_t)u8_Second * 2312, RTC_WAKEUPCLOCK_RTCCLK_DIV16);

  HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);

}

void RTC_IRQHandler(void)

{

  HAL_RTCEx_WakeUpTimerIRQHandler(pRTC);

}

void HAL_RTC_MspInit(RTC_HandleTypeDef *hrtc)

{

  __HAL_RCC_RTC_ENABLE();

  HAL_NVIC_SetPriority(RTC_IRQn, 0x0, 0);

  HAL_NVIC_EnableIRQ(RTC_IRQn);

}

void HAL_RTC_MspDeInit(RTC_HandleTypeDef *hrtc)

{

   __HAL_RCC_RTC_DISABLE();

}

除此之外，我们还需对RTC进行配置，和设置中断服务处理函数。

/**

  ******************************************************************************

  * @file    stm32l0xx_hal_conf.h

  * @author  MCD Application Team

  * @brief   HAL configuration template file. 

  *          This file should be copied to the application folder and renamed

  *          to stm32l0xx_hal_conf.h.

  ******************************************************************************

  * @attention

  *

  *

© Copyright (c) 2016 STMicroelectronics. 

  * All rights reserved.

  *

  * This software component is licensed by ST under BSD 3-Clause license,

  * the "License"; You may not use this file except in compliance with the 

  * License. You may obtain a copy of the License at:

  *                        opensource.org/licenses/BSD-3-Clause

  *

  ******************************************************************************

  */ 

/* Define to prevent recursive inclusion -------------------------------------*/

#ifndef __STM32L0xx_HAL_CONF_H

#define __STM32L0xx_HAL_CONF_H

#ifdef __cplusplus

 extern "C" {

#endif

/* Exported types ------------------------------------------------------------*/

/* Exported constants --------------------------------------------------------*/

/* ########################## Module Selection ############################## */

/**

  * @brief This is the list of modules to be used in the HAL driver 

  */

#define HAL_MODULE_ENABLED  

/*#define HAL_ADC_MODULE_ENABLED    */

/*#define HAL_CRYP_MODULE_ENABLED    */

/*#define HAL_COMP_MODULE_ENABLED    */

/*#define HAL_CRC_MODULE_ENABLED    */

/*#define HAL_CRYP_MODULE_ENABLED    */

/*#define HAL_DAC_MODULE_ENABLED    */

/*#define HAL_FIREWALL_MODULE_ENABLED   */

/*#define HAL_I2S_MODULE_ENABLED    */

#define HAL_IWDG_MODULE_ENABLED 

/*#define HAL_LCD_MODULE_ENABLED    */

/*#define HAL_LPTIM_MODULE_ENABLED    */

/*#define HAL_RNG_MODULE_ENABLED    */

#define HAL_RTC_MODULE_ENABLED   

/*#define HAL_SPI_MODULE_ENABLED    */

#define HAL_TIM_MODULE_ENABLED

/*#define HAL_TSC_MODULE_ENABLED    */

#define HAL_UART_MODULE_ENABLED

/*#define HAL_USART_MODULE_ENABLED    */

/*#define HAL_IRDA_MODULE_ENABLED    */

/*#define HAL_SMARTCARD_MODULE_ENABLED  */

/*#define HAL_SMBUS_MODULE_ENABLED    */

/*#define HAL_WWDG_MODULE_ENABLED    */

/*#define HAL_PCD_MODULE_ENABLED */

/*#define HAL_EXTI_MODULE_ENABLED    */

#define HAL_GPIO_MODULE_ENABLED

#define HAL_DMA_MODULE_ENABLED

#define HAL_I2C_MODULE_ENABLED

#define HAL_RCC_MODULE_ENABLED

#define HAL_FLASH_MODULE_ENABLED

#define HAL_PWR_MODULE_ENABLED

#define HAL_CORTEX_MODULE_ENABLED

/* ########################## Oscillator Values adaptation ####################*/

/**

  * @brief Adjust the value of External High Speed oscillator (HSE) used in your application.

  *        This value is used by the RCC HAL module to compute the system frequency

  *        (when HSE is used as system clock source, directly or through the PLL).  

  */

#if !defined  (HSE_VALUE) 

  #define HSE_VALUE    ((uint32_t)12000000U) /*!< Value of the External oscillator in Hz */

#endif /* HSE_VALUE */

#if !defined  (HSE_STARTUP_TIMEOUT)

  #define HSE_STARTUP_TIMEOUT    ((uint32_t)100U)   /*!< Time out for HSE start up, in ms */

#endif /* HSE_STARTUP_TIMEOUT */

/**

  * @brief Internal Multiple Speed oscillator (MSI) default value.

  *        This value is the default MSI range value after Reset.

  */

#if !defined  (MSI_VALUE)

  #define MSI_VALUE    ((uint32_t)2097000U) /*!< Value of the Internal oscillator in Hz*/

#endif /* MSI_VALUE */

/**

  * @brief Internal High Speed oscillator (HSI) value.

  *        This value is used by the RCC HAL module to compute the system frequency

  *        (when HSI is used as system clock source, directly or through the PLL). 

  */

#if !defined  (HSI_VALUE)

  #define HSI_VALUE    ((uint32_t)16000000U) /*!< Value of the Internal oscillator in Hz*/

#endif /* HSI_VALUE */

/**

  * @brief Internal High Speed oscillator for USB (HSI48) value.

  */

#if !defined  (HSI48_VALUE) 

#define HSI48_VALUE ((uint32_t)48000000U) /*!< Value of the Internal High Speed oscillator for USB in Hz.

                                             The real value may vary depending on the variations

                                             in voltage and temperature.  */

#endif /* HSI48_VALUE */

/**

  * @brief Internal Low Speed oscillator (LSI) value.

  */

#if !defined  (LSI_VALUE) 

 #define LSI_VALUE  ((uint32_t)37000U)       /*!< LSI Typical Value in Hz*/

#endif /* LSI_VALUE */                      /*!< Value of the Internal Low Speed oscillator in Hz

                                             The real value may vary depending on the variations

                                             in voltage and temperature.*/   

/**

  * @brief External Low Speed oscillator (LSE) value.

  *        This value is used by the UART, RTC HAL module to compute the system frequency

  */

#if !defined  (LSE_VALUE)

  #define LSE_VALUE    ((uint32_t)32768U) /*!< Value of the External oscillator in Hz*/

#endif /* LSE_VALUE */

#if !defined  (LSE_STARTUP_TIMEOUT)

  #define LSE_STARTUP_TIMEOUT  ((uint32_t)5000U)   /*!< Time out for LSE start up, in ms */

#endif /* LSE_STARTUP_TIMEOUT */

/* Tip: To avoid modifying this file each time you need to use different HSE,

   ===  you can define the HSE value in your toolchain compiler preprocessor. */

/* ########################### System Configuration ######################### */

/**

  * @brief This is the HAL system configuration section

  */     

#define  VDD_VALUE                    ((uint32_t)3300U) /*!< Value of VDD in mv */           

#define  TICK_INT_PRIORITY            ((uint32_t)0U)    /*!< tick interrupt priority */            

#define  USE_RTOS                     0U     

#define  PREFETCH_ENABLE              0U              

#define  PREREAD_ENABLE               1U

#define  BUFFER_CACHE_DISABLE         0U

/* ########################## Assert Selection ############################## */