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TARGET_STM32F7\rtc_api.c enable backup RTC function 

Simple check to test the RTC ISR register if RTC is set up and running.
Avoids register reset on nRST or power cycle with vBAT present.
pull/1368/head
Paul Staron 2015-10-01 23:50:18 +01:00
parent d5e85cd3ea
commit 63abe6ff15
1 changed files with 51 additions and 47 deletions
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98
libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F7/rtc_api.c
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@ -33,8 +33,6 @@
#include "mbed_error.h"
static int rtc_inited = 0;
static RTC_HandleTypeDef RtcHandle;
void rtc_init(void)
@ -42,58 +40,59 @@ void rtc_init(void)
RCC_OscInitTypeDef RCC_OscInitStruct;
uint32_t rtc_freq = 0;
if (rtc_inited) return;
rtc_inited = 1;
if(RTC->ISR == 7) { // RTC initialization and status register (RTC_ISR), cold start (with no backup domain power) RTC reset value
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;
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;
// 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_OFF;
RCC_OscInitStruct.LSIState = RCC_LSI_ON;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
error("RTC error: LSI clock initialization failed.");
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;
}
// 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;
}
// Enable RTC
__HAL_RCC_RTC_ENABLE();
// Enable RTC
__HAL_RCC_RTC_ENABLE();
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;
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.");
}
if (HAL_RTC_Init(&RtcHandle) != HAL_OK) {
error("RTC error: RTC initialization failed.");
}
}
@ -119,13 +118,15 @@ void rtc_free(void)
RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
HAL_RCC_OscConfig(&RCC_OscInitStruct);
rtc_inited = 0;
}
int rtc_isenabled(void)
{
return rtc_inited;
if(RTC->ISR != 7) {
return 1;
} else {
return 0;
}
}
/*
@ -180,6 +181,9 @@ void rtc_write(time_t t)
RtcHandle.Instance = RTC;
// Enable write access to Backup domain
HAL_PWR_EnableBkUpAccess();
// Convert the time into a tm
struct tm *timeinfo = localtime(&t);