我正試圖在STM32F469I-DISCO開發板上初始化RTC。由於我仍在學習,所以我嘗試使用HAL API來完成一些項目,直到有一天我能夠充分理解這個微控制器直接使用寄存器。初始化過程中STM32 RTC超時
無論如何,我的代碼使用CubeF4的STM32F469I-DISCO模板,它允許直接加載HAL層和系統時鐘(通過8 MHz HSE振盪器的180 MHz)。
爲了初始化RTC,我遵循了UM1725 : Description of STM32F4 HAL and LL drivers中給出的指示。第715頁,第55.2.4節,您有使用HAL_RTC API的說明。
而第一點說,有必要啓用「RTC域訪問」。這一點在上面的章節中解釋(55.2.3,同一頁)。
我做了要求做的事情。這裏是我的代碼(簡化,我只讓RTC Init部分和系統時鐘配置):
#include "main.h"
RTC_HandleTypeDef rtcHandle;
RTC_InitTypeDef rtcInit;
RTC_TimeTypeDef rtcTime;
RTC_DateTypeDef rtcDate;
static void SystemClock_Config(void);
static void Error_Handler(void);
int main(void)
{
HAL_Init();
SystemClock_Config();
////////////////// RTC
HAL_PWR_EnableBkUpAccess();
__HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE);
__HAL_RCC_RTC_ENABLE();
rtcInit.HourFormat = RTC_HOURFORMAT_24;
rtcInit.AsynchPrediv = 0x7F;
rtcInit.SynchPrediv = 0xFF;
rtcInit.OutPut = RTC_OUTPUT_DISABLE;
rtcInit.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
rtcInit.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
rtcHandle.Instance = RTC;
rtcHandle.Init = rtcInit;
HAL_RTC_Init(&rtcHandle);
rtcTime.Hours = 12;
rtcTime.Minutes = 30;
rtcTime.Seconds = 40;
rtcDate.WeekDay = RTC_WEEKDAY_WEDNESDAY;
rtcDate.Month = RTC_MONTH_APRIL;
rtcDate.Date = 4;
rtcDate.Year= 17;
HAL_RTC_SetTime(&rtcHandle, &rtcTime, RTC_FORMAT_BCD);
while (1)
{
}
}
static void SystemClock_Config(void)
{
RCC_ClkInitTypeDef RCC_ClkInitStruct;
RCC_OscInitTypeDef RCC_OscInitStruct;
/* Enable Power Control clock */
__HAL_RCC_PWR_CLK_ENABLE();
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/* Enable HSE Oscillator and activate PLL with HSE as source */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
#if defined(USE_STM32469I_DISCO_REVA)
RCC_OscInitStruct.PLL.PLLM = 25;
#else
RCC_OscInitStruct.PLL.PLLM = 8;
#endif /* USE_STM32469I_DISCO_REVA */
RCC_OscInitStruct.PLL.PLLN = 360;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = 7;
RCC_OscInitStruct.PLL.PLLR = 6;
if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/* Enable the OverDrive to reach the 180 Mhz Frequency */
if(HAL_PWREx_EnableOverDrive() != HAL_OK)
{
Error_Handler();
}
RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief This function is executed in case of error occurrence.
* @param None
* @retval None
*/
static void Error_Handler(void)
{
/* User may add here some code to deal with this error */
while(1)
{
}
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
而且它不起作用。經過一些挖掘到最底層後,我設法找到它不起作用的地方。我只是不知道爲什麼。
HAL_RTC_Init()調用返回一個HAL_ERROR狀態。出現此HAL_ERROR是因爲HAL_RTC_Init()調用RTC_EnterInitMode()並返回HAL_TIMEOUT狀態,因爲在期望的時間內沒有達到條件。下面是功能:
HAL_StatusTypeDef HAL_RTC_Init(RTC_HandleTypeDef *hrtc)
{
/* Check the RTC peripheral state */
if(hrtc == NULL)
{
return HAL_ERROR;
}
/* Check the parameters */
assert_param(IS_RTC_HOUR_FORMAT(hrtc->Init.HourFormat));
assert_param(IS_RTC_ASYNCH_PREDIV(hrtc->Init.AsynchPrediv));
assert_param(IS_RTC_SYNCH_PREDIV(hrtc->Init.SynchPrediv));
assert_param (IS_RTC_OUTPUT(hrtc->Init.OutPut));
assert_param (IS_RTC_OUTPUT_POL(hrtc->Init.OutPutPolarity));
assert_param(IS_RTC_OUTPUT_TYPE(hrtc->Init.OutPutType));
if(hrtc->State == HAL_RTC_STATE_RESET)
{
/* Allocate lock resource and initialize it */
hrtc->Lock = HAL_UNLOCKED;
/* Initialize RTC MSP */
HAL_RTC_MspInit(hrtc);
}
/* Set RTC state */
hrtc->State = HAL_RTC_STATE_BUSY;
/* Disable the write protection for RTC registers */
__HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);
/* Set Initialization mode */
if(RTC_EnterInitMode(hrtc) != HAL_OK)
{
/* Enable the write protection for RTC registers */
__HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);
/* Set RTC state */
hrtc->State = HAL_RTC_STATE_ERROR;
return HAL_ERROR;
}
else
{
/* Clear RTC_CR FMT, OSEL and POL Bits */
hrtc->Instance->CR &= ((uint32_t)~(RTC_CR_FMT | RTC_CR_OSEL | RTC_CR_POL));
/* Set RTC_CR register */
hrtc->Instance->CR |= (uint32_t)(hrtc->Init.HourFormat | hrtc->Init.OutPut | hrtc->Init.OutPutPolarity);
/* Configure the RTC PRER */
hrtc->Instance->PRER = (uint32_t)(hrtc->Init.SynchPrediv);
hrtc->Instance->PRER |= (uint32_t)(hrtc->Init.AsynchPrediv << 16U);
/* Exit Initialization mode */
hrtc->Instance->ISR &= (uint32_t)~RTC_ISR_INIT;
hrtc->Instance->TAFCR &= (uint32_t)~RTC_TAFCR_ALARMOUTTYPE;
hrtc->Instance->TAFCR |= (uint32_t)(hrtc->Init.OutPutType);
/* Enable the write protection for RTC registers */
__HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);
/* Set RTC state */
hrtc->State = HAL_RTC_STATE_READY;
return HAL_OK;
}
}
和:
HAL_StatusTypeDef RTC_EnterInitMode(RTC_HandleTypeDef* hrtc)
{
uint32_t tickstart = 0U;
/* Check if the Initialization mode is set */
if((hrtc->Instance->ISR & RTC_ISR_INITF) == (uint32_t)RESET)
{
/* Set the Initialization mode */
hrtc->Instance->ISR = (uint32_t)RTC_INIT_MASK;
/* Get tick */
tickstart = HAL_GetTick();
/* Wait till RTC is in INIT state and if Time out is reached exit */
while((hrtc->Instance->ISR & RTC_ISR_INITF) == (uint32_t)RESET)
{
if((HAL_GetTick() - tickstart) > RTC_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
}
return HAL_OK;
}
所以,如果我調查很好,問題是,條件: hrtc->實例 - > ISR & RTC_ISR_INITF ==(uint32_t的) RESET的確是 (因爲TIMEOUT條件被提升)。我不明白的是根據上面的函數(EnterInitMode),RTC_ISR_INITF和ISR變量似乎是明確定義的,因此,按位操作值不是0(RESET)。
的 「ISR」 被直接函數定義且是RTC_INIT_MASK(#定義與stm32f4xx_hal_rtc.h 0xFFFFFFFF的值)
的 「RTC_ISR_INITF」 是一個宏:(0x1U < < RTC_ISR_INITF_Pos)其中RTC_ISR_INITF_Pos是6U (#define)定義在stm32f469xx.h
我錯了,如果我說「&」操作不是0?
你知道爲什麼我提出這個TIMEOUT條件嗎?
在此先感謝!