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Merge pull request #1558 from dbestm/dev_l476rg_rtc 

l476rg rtc
pull/1568/head
Martin Kojtal 2016-02-25 09:42:00 +00:00
parent 8e70fc70ed ab3cda47b9
commit 8577dc9680
3 changed files with 38 additions and 19 deletions
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2
libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32L4/stm32l4xx_hal_rcc.h
View File

@ -159,7 +159,7 @@ typedef struct
* @{
*/
#define RCC_DBP_TIMEOUT_VALUE ((uint32_t)100)
#define RCC_LSE_TIMEOUT_VALUE ((uint32_t)100)
#define RCC_LSE_TIMEOUT_VALUE ((uint32_t)5000)
/**
* @}
*/

1
libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32L4/TARGET_DISCO_L476VG/device.h
View File

@ -48,6 +48,7 @@
#define DEVICE_SPISLAVE 1
#define DEVICE_RTC 1
#define DEVICE_RTC_LSI 0
#define DEVICE_PWMOUT 1

54
libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32L4/rtc_api.c
View File

@ -33,7 +33,9 @@
#include "mbed_error.h"
#if DEVICE_RTC_LSI
static int rtc_inited = 0;
#endif
static RTC_HandleTypeDef RtcHandle;
@ -43,8 +45,10 @@ void rtc_init(void)
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
uint32_t rtc_freq = 0;
#if DEVICE_RTC_LSI
if (rtc_inited) return;
rtc_inited = 1;
#endif
RtcHandle.Instance = RTC;
@ -58,6 +62,7 @@ void rtc_init(void)
__HAL_RCC_BACKUPRESET_FORCE();
__HAL_RCC_BACKUPRESET_RELEASE();
#if !DEVICE_RTC_LSI
// Enable LSE Oscillator
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
@ -69,24 +74,27 @@ void rtc_init(void)
PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
rtc_freq = LSE_VALUE;
} else { // LSE didn't start, try with LSI
// 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("Cannot initialize RTC with LSI\n");
}
// Connect LSI to RTC
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSI;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK) {
error("Cannot initialize RTC with LSI\n");
}
// This value is LSI typical value. To be measured precisely using a timer input capture for example.
rtc_freq = 40000;
} else {
error("Cannot initialize RTC with LSE\n");
}
#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("Cannot initialize RTC with LSI\n");
}
// Connect LSI to RTC
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSI;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK) {
error("Cannot initialize RTC with LSI\n");
}
// This value is LSI typical value. To be measured precisely using a timer input capture for example.
rtc_freq = 40000;
#endif
// Check if RTC is already initialized
if ((RTC->ISR & RTC_ISR_INITS) == RTC_ISR_INITS) return;
@ -129,12 +137,22 @@ void rtc_free(void)
RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
HAL_RCC_OscConfig(&RCC_OscInitStruct);
#if DEVICE_RTC_LSI
rtc_inited = 0;
#endif
}
int rtc_isenabled(void)
{
return rtc_inited;
#if DEVICE_RTC_LSI
return rtc_inited;
#else
if ((RTC->ISR & RTC_ISR_INITS) == RTC_ISR_INITS) {
return 1;
} else {
return 0;
}
#endif
}
/*