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[STM32F7 family] fix issue with RTC init #1581

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Merged
merged 1 commit into from
Mar 1, 2016
Merged

[STM32F7 family] fix issue with RTC init #1581

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85 changes: 42 additions & 43 deletions libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F7/rtc_api.c
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Original file line number Diff line number Diff line change
Expand Up @@ -40,59 +40,58 @@ void rtc_init(void)
RCC_OscInitTypeDef RCC_OscInitStruct;
uint32_t rtc_freq = 0;

RtcHandle.Instance = RTC;
RtcHandle.Instance = RTC;

// Enable Power clock
__PWR_CLK_ENABLE();
// Enable Power clock
__PWR_CLK_ENABLE();

// Enable access to Backup domain
HAL_PWR_EnableBkUpAccess();
// Enable access to Backup domain
HAL_PWR_EnableBkUpAccess();

// Reset Backup domain
__HAL_RCC_BACKUPRESET_FORCE();
__HAL_RCC_BACKUPRESET_RELEASE();
// Reset Backup domain
__HAL_RCC_BACKUPRESET_FORCE();
__HAL_RCC_BACKUPRESET_RELEASE();

// Enable LSE Oscillator
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
// Enable LSE Oscillator
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
RCC_OscInitStruct.LSEState = RCC_LSE_ON; // External 32.768 kHz clock on OSC_IN/OSC_OUT
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) {
// Connect LSE to RTC
__HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSE);
__HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE);
rtc_freq = LSE_VALUE;
} else {
// Enable LSI clock
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
RCC_OscInitStruct.LSEState = RCC_LSE_ON; // External 32.768 kHz clock on OSC_IN/OSC_OUT
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) {
// Connect LSE to RTC
__HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSE);
__HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE);
rtc_freq = LSE_VALUE;
} else {
// Enable LSI clock
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
RCC_OscInitStruct.LSIState = RCC_LSI_ON;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
error("RTC error: LSI clock initialization failed.");
}
// Connect LSI to RTC
__HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSI);
__HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI);
// [TODO] This value is LSI typical value. To be measured precisely using a timer input capture
rtc_freq = LSI_VALUE;
RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
RCC_OscInitStruct.LSIState = RCC_LSI_ON;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
error("RTC error: LSI clock initialization failed.");
}
// Connect LSI to RTC
__HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSI);
__HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI);
// [TODO] This value is LSI typical value. To be measured precisely using a timer input capture
rtc_freq = LSI_VALUE;
}

if((RTC->ISR & RTC_ISR_INITS) == RTC_ISR_INITS) { // RTC initialization and status register (RTC_ISR), cold start (with no backup domain power) RTC reset value

// Enable RTC
__HAL_RCC_RTC_ENABLE();
// Check if RTC is already initialized
if ((RTC->ISR & RTC_ISR_INITS) == RTC_ISR_INITS) return;

RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
RtcHandle.Init.AsynchPrediv = 127;
RtcHandle.Init.SynchPrediv = (rtc_freq / 128) - 1;
RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
// Enable RTC
__HAL_RCC_RTC_ENABLE();

if (HAL_RTC_Init(&RtcHandle) != HAL_OK) {
error("RTC error: RTC initialization failed.");
}
RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
RtcHandle.Init.AsynchPrediv = 127;
RtcHandle.Init.SynchPrediv = (rtc_freq / 128) - 1;
RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;

if (HAL_RTC_Init(&RtcHandle) != HAL_OK) {
error("RTC error: RTC initialization failed.");
}
}

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