Diff: targets/TARGET_STM/TARGET_STM32L4/rtc_api.c

Revision:

149:156823d33999

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/TARGET_STM32L4/rtc_api.c	Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,310 @@
+/* mbed Microcontroller Library
+ *******************************************************************************
+ * Copyright (c) 2015, STMicroelectronics
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *******************************************************************************
+ */
+#include "rtc_api.h"
+#include "rtc_api_hal.h"
+
+#if DEVICE_RTC
+
+#include "mbed_error.h"
+
+#if RTC_LSI
+static int rtc_inited = 0;
+#endif
+
+static RTC_HandleTypeDef RtcHandle;
+
+#if RTC_LSI
+    #define RTC_CLOCK LSI_VALUE
+#else
+    #define RTC_CLOCK LSE_VALUE
+#endif
+
+#if DEVICE_LOWPOWERTIMER
+    #define RTC_ASYNCH_PREDIV ((RTC_CLOCK - 1) / 0x8000)
+    #define RTC_SYNCH_PREDIV  (RTC_CLOCK / (RTC_ASYNCH_PREDIV + 1) - 1)
+#else
+    #define RTC_ASYNCH_PREDIV (0x007F)
+    #define RTC_SYNCH_PREDIV  (RTC_CLOCK / (RTC_ASYNCH_PREDIV + 1) - 1)    
+#endif
+
+#if DEVICE_LOWPOWERTIMER
+    static void (*irq_handler)(void);
+    static void RTC_IRQHandler(void);
+#endif
+
+void rtc_init(void)
+{
+    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
+    RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
+
+#if RTC_LSI
+    if (rtc_inited) return;
+    rtc_inited = 1;
+#endif
+
+    RtcHandle.Instance = RTC;
+
+#if !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!
+    RCC_OscInitStruct.LSEState       = RCC_LSE_ON; // External 32.768 kHz clock on OSC_IN/OSC_OUT
+    RCC_OscInitStruct.LSIState       = RCC_LSI_OFF;
+    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) { // Check if LSE has started correctly
+        // Connect LSE to RTC
+        PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
+        PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
+        HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
+    } else {
+        error("Cannot initialize RTC with LSE\n");
+    }
+#else
+    // Enable Power clock
+    __HAL_RCC_PWR_CLK_ENABLE();
+
+    // Enable access to Backup domain
+    HAL_PWR_EnableBkUpAccess();
+
+    // Reset Backup domain
+    __HAL_RCC_BACKUPRESET_FORCE();
+    __HAL_RCC_BACKUPRESET_RELEASE();
+
+    // 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");
+    }
+#endif
+
+    // Check if RTC is already initialized
+    if ((RTC->ISR & RTC_ISR_INITS) ==  RTC_ISR_INITS) return;
+
+    // Enable RTC
+    __HAL_RCC_RTC_ENABLE();
+
+    RtcHandle.Init.HourFormat     = RTC_HOURFORMAT_24;
+    RtcHandle.Init.AsynchPrediv   = RTC_ASYNCH_PREDIV;
+    RtcHandle.Init.SynchPrediv    = RTC_SYNCH_PREDIV;
+    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("Cannot initialize RTC\n");
+    }
+
+#if DEVICE_LOWPOWERTIMER
+#if RTC_LSI
+    rtc_write(0);
+#else
+    if (!rtc_isenabled()) {
+        rtc_write(0);
+    }
+#endif
+    NVIC_ClearPendingIRQ(RTC_WKUP_IRQn);
+    NVIC_DisableIRQ(RTC_WKUP_IRQn);
+    NVIC_SetVector(RTC_WKUP_IRQn, (uint32_t)RTC_IRQHandler);
+    NVIC_EnableIRQ(RTC_WKUP_IRQn);
+#endif
+}
+
+void rtc_free(void)
+{
+#if RTC_LSI
+    // Enable Power clock
+    __HAL_RCC_PWR_CLK_ENABLE();
+
+    // Enable access to Backup domain
+    HAL_PWR_EnableBkUpAccess();
+
+    // Reset Backup domain
+    __HAL_RCC_BACKUPRESET_FORCE();
+    __HAL_RCC_BACKUPRESET_RELEASE();
+
+    // Disable access to Backup domain
+    HAL_PWR_DisableBkUpAccess();
+#endif
+
+    // Disable LSI and LSE clocks
+    RCC_OscInitTypeDef RCC_OscInitStruct;
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
+    RCC_OscInitStruct.PLL.PLLState   = RCC_PLL_NONE;
+    RCC_OscInitStruct.LSIState       = RCC_LSI_OFF;
+    RCC_OscInitStruct.LSEState       = RCC_LSE_OFF;
+    HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+#if RTC_LSI
+    rtc_inited = 0;
+#endif
+}
+
+int rtc_isenabled(void)
+{
+#if RTC_LSI
+  return rtc_inited;
+#else
+  if ((RTC->ISR & RTC_ISR_INITS) ==  RTC_ISR_INITS) {
+    return 1;
+  } else {
+    return 0;
+  }
+#endif
+}
+
+/*
+ RTC Registers
+   RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
+   RTC_Month   1=january, 2=february, ..., 12=december
+   RTC_Date    day of the month 1-31
+   RTC_Year    year 0-99
+ struct tm
+   tm_sec      seconds after the minute 0-61
+   tm_min      minutes after the hour 0-59
+   tm_hour     hours since midnight 0-23
+   tm_mday     day of the month 1-31
+   tm_mon      months since January 0-11
+   tm_year     years since 1900
+   tm_wday     days since Sunday 0-6
+   tm_yday     days since January 1 0-365
+   tm_isdst    Daylight Saving Time flag
+*/
+time_t rtc_read(void)
+{
+    RTC_DateTypeDef dateStruct;
+    RTC_TimeTypeDef timeStruct;
+    struct tm timeinfo;
+
+    RtcHandle.Instance = RTC;
+
+    // Read actual date and time
+    // Warning: the time must be read first!
+    HAL_RTC_GetTime(&RtcHandle, &timeStruct, RTC_FORMAT_BIN);
+    HAL_RTC_GetDate(&RtcHandle, &dateStruct, RTC_FORMAT_BIN);
+
+    // Setup a tm structure based on the RTC
+    timeinfo.tm_wday = dateStruct.WeekDay;
+    timeinfo.tm_mon  = dateStruct.Month - 1;
+    timeinfo.tm_mday = dateStruct.Date;
+    timeinfo.tm_year = dateStruct.Year + 68;
+    timeinfo.tm_hour = timeStruct.Hours;
+    timeinfo.tm_min  = timeStruct.Minutes;
+    timeinfo.tm_sec  = timeStruct.Seconds;
+    // Daylight Saving Time information is not available
+    timeinfo.tm_isdst = -1;
+
+    // Convert to timestamp
+    time_t t = mktime(&timeinfo);
+
+    return t;
+}
+
+void rtc_write(time_t t)
+{
+    RTC_DateTypeDef dateStruct;
+    RTC_TimeTypeDef timeStruct;
+
+    RtcHandle.Instance = RTC;
+
+    // Convert the time into a tm
+    struct tm *timeinfo = localtime(&t);
+
+    // Fill RTC structures
+    dateStruct.WeekDay        = timeinfo->tm_wday;
+    dateStruct.Month          = timeinfo->tm_mon + 1;
+    dateStruct.Date           = timeinfo->tm_mday;
+    dateStruct.Year           = timeinfo->tm_year - 68;
+    timeStruct.Hours          = timeinfo->tm_hour;
+    timeStruct.Minutes        = timeinfo->tm_min;
+    timeStruct.Seconds        = timeinfo->tm_sec;
+    timeStruct.TimeFormat     = RTC_HOURFORMAT_24;
+    timeStruct.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
+    timeStruct.StoreOperation = RTC_STOREOPERATION_RESET;
+
+    // Change the RTC current date/time
+    HAL_RTC_SetDate(&RtcHandle, &dateStruct, RTC_FORMAT_BIN);
+    HAL_RTC_SetTime(&RtcHandle, &timeStruct, RTC_FORMAT_BIN);
+}
+
+#if DEVICE_LOWPOWERTIMER
+
+static void RTC_IRQHandler(void)
+{
+    HAL_RTCEx_WakeUpTimerIRQHandler(&RtcHandle);
+}
+
+void HAL_RTCEx_WakeUpTimerEventCallback(RTC_HandleTypeDef *hrtc)
+{
+    if (irq_handler) {
+        // Fire the user callback
+        irq_handler();
+    }
+}
+
+void rtc_set_irq_handler(uint32_t handler)
+{
+    irq_handler = (void (*)(void))handler;
+}
+
+uint32_t rtc_read_subseconds(void)
+{
+    return 1000000.f * ((double)(RTC_SYNCH_PREDIV - RTC->SSR) / (RTC_SYNCH_PREDIV + 1));
+}
+
+void rtc_set_wake_up_timer(uint32_t delta)
+{
+    uint32_t wake_up_counter = delta / (2000000 / RTC_CLOCK);
+  
+    if (HAL_RTCEx_SetWakeUpTimer_IT(&RtcHandle, wake_up_counter,
+                                    RTC_WAKEUPCLOCK_RTCCLK_DIV2) != HAL_OK) {
+        error("Set wake up timer failed\n");
+    }
+}
+
+void rtc_deactivate_wake_up_timer(void)
+{
+    HAL_RTCEx_DeactivateWakeUpTimer(&RtcHandle);
+}
+
+void rtc_synchronize(void)
+{
+    HAL_RTC_WaitForSynchro(&RtcHandle);
+}
+#endif // DEVICE_LOWPOWERTIMER
+
+#endif