358 lines
11 KiB
C
358 lines
11 KiB
C
/**
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******************************************************************************
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* @file RTC/RTC_LSI/Src/main.c
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* @author MCD Application Team
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* @brief This sample code shows how to use STM32F1xx RTC HAL API to
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* use the LSI clock source auto calibration to get a precise RTC
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* clock.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "main.h"
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/** @addtogroup STM32F1xx_HAL_Examples
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* @{
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*/
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/** @addtogroup RTC_LSI
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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#define WAKEUP_TIMER_ENABLE 0x32F2
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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RTC_HandleTypeDef RtcHandle;
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TIM_HandleTypeDef Input_Handle;
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uint16_t tmpCCTIM_CHANNEL_4[2] = {0, 0};
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__IO uint32_t uwLsiFreq = 0;
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__IO uint32_t uwCaptureNumber = 0;
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__IO uint32_t uwPeriodValue = 0;
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/* Private function prototypes -----------------------------------------------*/
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void SystemClock_Config(void);
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static void RTC_Config(void);
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static uint32_t GetLSIFrequency(void);
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/* Private functions ---------------------------------------------------------*/
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/**
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* @brief Main program
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* @param None
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* @retval None
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*/
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int main(void)
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{
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/* STM32F107xC HAL library initialization:
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- Configure the Flash prefetch
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- Systick timer is configured by default as source of time base, but user
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can eventually implement his proper time base source (a general purpose
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timer for example or other time source), keeping in mind that Time base
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duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
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handled in milliseconds basis.
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- Set NVIC Group Priority to 4
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- Low Level Initialization
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*/
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HAL_Init();
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/* Configure the system clock to 72 MHz */
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SystemClock_Config();
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/* Configure LED1 */
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BSP_LED_Init(LED1);
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BSP_LED_Init(LED_RED);
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/* Configure Button Key */
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BSP_PB_Init(BUTTON_KEY, BUTTON_MODE_GPIO);
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/* RTC Configuration -------------------------------------------------------*/
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RTC_Config();
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/* Wait Until KEY BUTTON is pressed */
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while(BSP_PB_GetState(BUTTON_KEY) != RESET)
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{
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}
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while(BSP_PB_GetState(BUTTON_KEY) != SET)
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{
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}
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/* Get the LSI frequency: TIM5 is used to measure the LSI frequency */
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uwLsiFreq = GetLSIFrequency();
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/* Update the Calendar Configuration with the LSI exact value */
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RtcHandle.Init.AsynchPrediv = (uwLsiFreq - 1);
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if(HAL_RTC_Init(&RtcHandle) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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/* Infinite loop */
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while (1)
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{
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}
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}
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/**
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* @brief System Clock Configuration
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* The system Clock is configured as follow :
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* System Clock source = PLL (HSE)
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* SYSCLK(Hz) = 72000000
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* HCLK(Hz) = 72000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 2
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* APB2 Prescaler = 1
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* HSE Frequency(Hz) = 25000000
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* HSE PREDIV1 = 5
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* HSE PREDIV2 = 5
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* PLL2MUL = 8
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* Flash Latency(WS) = 2
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* @param None
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* @retval None
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*/
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void SystemClock_Config(void)
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{
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RCC_ClkInitTypeDef clkinitstruct = {0};
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RCC_OscInitTypeDef oscinitstruct = {0};
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/* Configure PLLs ------------------------------------------------------*/
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/* PLL2 configuration: PLL2CLK = (HSE / HSEPrediv2Value) * PLL2MUL = (25 / 5) * 8 = 40 MHz */
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/* PREDIV1 configuration: PREDIV1CLK = PLL2CLK / HSEPredivValue = 40 / 5 = 8 MHz */
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/* PLL configuration: PLLCLK = PREDIV1CLK * PLLMUL = 8 * 9 = 72 MHz */
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/* Enable HSE Oscillator and activate PLL with HSE as source */
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oscinitstruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
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oscinitstruct.HSEState = RCC_HSE_ON;
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oscinitstruct.HSEPredivValue = RCC_HSE_PREDIV_DIV5;
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oscinitstruct.Prediv1Source = RCC_PREDIV1_SOURCE_PLL2;
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oscinitstruct.PLL.PLLState = RCC_PLL_ON;
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oscinitstruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
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oscinitstruct.PLL.PLLMUL = RCC_PLL_MUL9;
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oscinitstruct.PLL2.PLL2State = RCC_PLL2_ON;
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oscinitstruct.PLL2.PLL2MUL = RCC_PLL2_MUL8;
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oscinitstruct.PLL2.HSEPrediv2Value = RCC_HSE_PREDIV2_DIV5;
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if (HAL_RCC_OscConfig(&oscinitstruct)!= HAL_OK)
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{
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/* Initialization Error */
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while(1);
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}
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/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
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clocks dividers */
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clkinitstruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
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clkinitstruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
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clkinitstruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
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clkinitstruct.APB2CLKDivider = RCC_HCLK_DIV1;
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clkinitstruct.APB1CLKDivider = RCC_HCLK_DIV2;
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if (HAL_RCC_ClockConfig(&clkinitstruct, FLASH_LATENCY_2)!= HAL_OK)
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{
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/* Initialization Error */
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while(1);
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}
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}
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/**
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* @brief This function is executed in case of error occurrence.
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* @param None
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* @retval None
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*/
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void Error_Handler(void)
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{
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/* Turn LED_RED on */
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BSP_LED_On(LED_RED);
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while (1)
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{
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}
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}
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/**
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* @brief Configure the RTC peripheral by selecting the clock source.
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* @param None
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* @retval None
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*/
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static void RTC_Config(void)
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{
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/*##-1- Configure the RTC peripheral #######################################*/
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/* Configure RTC prescaler and RTC data registers */
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/* RTC configured as follow:
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- Asynch Prediv = Calculated automatically by HAL (based on LSI at 40kHz) */
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RtcHandle.Instance = RTC;
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RtcHandle.Init.AsynchPrediv = RTC_AUTO_1_SECOND;
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if(HAL_RTC_Init(&RtcHandle) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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/*##-2- Check if data stored in BackUp register1: Wakeup timer enable #######*/
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/* Read the Back Up Register 1 Data */
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if (HAL_RTCEx_BKUPRead(&RtcHandle, RTC_BKP_DR1) == WAKEUP_TIMER_ENABLE)
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{
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/* if the wakeup timer is enabled then desable it to disable the wakeup timer interrupt */
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if(HAL_RTCEx_DeactivateSecond(&RtcHandle) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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}
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/*##-3- Configure the RTC Wakeup peripheral #################################*/
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HAL_RTCEx_SetSecond_IT(&RtcHandle);
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/*##-4- Write 'wakeup timer enabled' tag in RTC Backup data Register 1 #######*/
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HAL_RTCEx_BKUPWrite(&RtcHandle, RTC_BKP_DR1, WAKEUP_TIMER_ENABLE);
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}
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/**
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* @brief Configures TIM5 to measure the LSI oscillator frequency.
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* @param None
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* @retval LSI Frequency
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*/
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static uint32_t GetLSIFrequency(void)
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{
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TIM_IC_InitTypeDef TIMInput_Config;
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/* Configure the TIM peripheral *********************************************/
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/* Set TIMx instance */
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Input_Handle.Instance = TIM5;
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/* TIM5 configuration: Input Capture mode ---------------------
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The LSI oscillator is connected to TIM5 TIM_CHANNEL_4.
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The Rising edge is used as active edge.
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The TIM5 CCR TIM_CHANNEL_4 is used to compute the frequency value.
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------------------------------------------------------------ */
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Input_Handle.Init.Prescaler = 0;
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Input_Handle.Init.CounterMode = TIM_COUNTERMODE_UP;
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Input_Handle.Init.Period = 0xFFFF;
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Input_Handle.Init.ClockDivision = 0;
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Input_Handle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
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if(HAL_TIM_IC_Init(&Input_Handle) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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/* Connect internally the TIM5 TIM_CHANNEL_4 Input Capture to the LSI clock output */
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__HAL_RCC_AFIO_CLK_ENABLE();
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__HAL_AFIO_REMAP_TIM5CH4_ENABLE();
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/* Configure the Input Capture of TIM_CHANNEL_4 */
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TIMInput_Config.ICPolarity = TIM_ICPOLARITY_RISING;
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TIMInput_Config.ICSelection = TIM_ICSELECTION_DIRECTTI;
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TIMInput_Config.ICPrescaler = TIM_ICPSC_DIV8;
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TIMInput_Config.ICFilter = 0;
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if(HAL_TIM_IC_ConfigChannel(&Input_Handle, &TIMInput_Config, TIM_CHANNEL_4) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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/* Start the TIM Input Capture measurement in interrupt mode */
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if(HAL_TIM_IC_Start_IT(&Input_Handle, TIM_CHANNEL_4) != HAL_OK)
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{
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Error_Handler();
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}
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/* Wait until the TIM5 get 2 LSI edges */
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while(uwCaptureNumber != 2)
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{
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}
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/* Disable TIM5 CC1 Interrupt Request */
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HAL_TIM_IC_Stop_IT(&Input_Handle, TIM_CHANNEL_4);
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/* Deinitialize the TIM5 peripheral registers to their default reset values */
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HAL_TIM_IC_DeInit(&Input_Handle);
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return uwLsiFreq;
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}
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/**
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* @brief Input Capture callback in non blocking mode
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* @param htim : TIM IC handle
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* @retval None
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*/
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void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
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{
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/* Get the Input Capture value */
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tmpCCTIM_CHANNEL_4[uwCaptureNumber++] = HAL_TIM_ReadCapturedValue(&Input_Handle, TIM_CHANNEL_4);
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if (uwCaptureNumber >= 2)
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{
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if ( tmpCCTIM_CHANNEL_4[0] > tmpCCTIM_CHANNEL_4[1] )
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{
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/* Compute the period length */
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uwPeriodValue = (uint16_t)(0xFFFF - tmpCCTIM_CHANNEL_4[0] + tmpCCTIM_CHANNEL_4[1] + 1);
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}
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else
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{
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/* Compute the period length */
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uwPeriodValue = (uint16_t)(tmpCCTIM_CHANNEL_4[1] - tmpCCTIM_CHANNEL_4[0] + 1);
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}
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/* Frequency computation */
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uwLsiFreq = (uint32_t) SystemCoreClock / uwPeriodValue;
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uwLsiFreq *= 8;
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}
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}
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/**
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* @brief RTC wakeup timer callback
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* @param htim : TIM IC handle
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* @retval None
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*/
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void HAL_RTCEx_RTCEventCallback(RTC_HandleTypeDef *hrtc)
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{
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/* Toggle LED1 */
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BSP_LED_Toggle(LED1);
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}
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#ifdef USE_FULL_ASSERT
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/**
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* @brief Reports the name of the source file and the source line number
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* where the assert_param error has occurred.
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* @param file: pointer to the source file name
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* @param line: assert_param error line source number
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* @retval None
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*/
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void assert_failed(uint8_t *file, uint32_t line)
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{
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/* User can add his own implementation to report the file name and line number,
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ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
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/* Infinite loop */
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while (1)
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{
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}
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}
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#endif
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/**
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* @}
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*/
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/**
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* @}
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*/
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