256 lines
7.6 KiB
C
256 lines
7.6 KiB
C
/**
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******************************************************************************
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* @file WWDG/WWDG_Example/Src/main.c
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* @author MCD Application Team
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* @brief This sample code shows how to use the STM32F103xB WWDG HAL API
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* to update at regular period the WWDG counter and how to simulate
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* a software fault generating an MCU WWDG reset on expiry of a
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* programmed time period.
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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 WWDG_Example
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* WWDG handler declaration */
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static WWDG_HandleTypeDef WwdgHandle;
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/* Private function prototypes -----------------------------------------------*/
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static uint32_t TimeoutCalculation(uint32_t timevalue);
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void SystemClock_Config(void);
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static void Error_Handler(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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uint32_t delay;
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/* STM32F103xB 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 64 MHz */
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SystemClock_Config();
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/* Configure LED2 */
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BSP_LED_Init(LED2);
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/* Configure User push-button */
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BSP_PB_Init(BUTTON_USER, BUTTON_MODE_EXTI);
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/*##-1- Check if the system has resumed from WWDG reset ####################*/
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if (__HAL_RCC_GET_FLAG(RCC_FLAG_WWDGRST) != RESET)
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{
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/* WWDGRST flag set: Turn LED2 on */
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BSP_LED_On(LED2);
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/* Insert 4s delay */
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HAL_Delay(4000);
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/* Clear reset flags */
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__HAL_RCC_CLEAR_RESET_FLAGS();
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}
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else
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{
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/* WWDGRST flag is not set: Turn LED2 off */
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BSP_LED_Off(LED2);
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}
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/*##-2- Configure the WWDG peripheral ######################################*/
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/* WWDG clock counter = (PCLK1 (32MHz)/4096)/8) = 976.56 Hz (~1024 us)
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WWDG Window value = 80 means that the WWDG counter should be refreshed only
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when the counter is below 80 (and greater than 64/0x40) otherwise a reset will
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be generated.
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WWDG Counter value = 127, WWDG timeout = ~1024 us * 64 = 65 ms */
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WwdgHandle.Instance = WWDG;
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WwdgHandle.Init.Prescaler = WWDG_PRESCALER_8;
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WwdgHandle.Init.Window = 80U;
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WwdgHandle.Init.Counter = 127U;
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if (HAL_WWDG_Init(&WwdgHandle) != 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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/* calculate delay to enter window. Add 1ms to secure round number to upper number
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Time to enter inside window
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Window timeout (in ms) = (127 - 80 + 1) * 1.024 = 49.152 ms */
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delay = TimeoutCalculation((WwdgHandle.Init.Counter - WwdgHandle.Init.Window) + 1) + 1;
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/* Infinite loop */
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while (1)
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{
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/* Toggle LED2 */
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BSP_LED_Toggle(LED2);
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/* Insert calculated delay */
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HAL_Delay(delay);
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/* Refresh WWDG */
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if (HAL_WWDG_Refresh(&WwdgHandle) != HAL_OK)
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{
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Error_Handler();
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}
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}
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}
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/**
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* @brief Timeout calculation function.
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* This function calculates any timeout related to
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* WWDG with given prescaler and system clock.
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* @param timevalue: period in term of WWDG counter cycle.
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* @retval None
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*/
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static uint32_t TimeoutCalculation(uint32_t timevalue)
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{
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uint32_t timeoutvalue = 0;
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uint32_t pclk1 = 0;
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uint32_t wdgtb = 0;
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/* considering APB divider is still 1, use HCLK value */
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pclk1 = HAL_RCC_GetPCLK1Freq();
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/* get prescaler */
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wdgtb = (1 << ((WwdgHandle.Init.Prescaler) >> 7)); /* 2^WDGTB[1:0] */
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/* calculate timeout */
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timeoutvalue = ((4096 * wdgtb * timevalue) / (pclk1 / 1000));
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return timeoutvalue;
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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 (HSI)
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* SYSCLK(Hz) = 64000000
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* HCLK(Hz) = 64000000
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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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* PLLMUL = 16
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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 PLL ------------------------------------------------------*/
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/* PLL configuration: PLLCLK = (HSI / 2) * PLLMUL = (8 / 2) * 16 = 64 MHz */
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/* PREDIV1 configuration: PREDIV1CLK = PLLCLK / HSEPredivValue = 64 / 1 = 64 MHz */
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/* Enable HSI and activate PLL with HSi_DIV2 as source */
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oscinitstruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
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oscinitstruct.HSEState = RCC_HSE_OFF;
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oscinitstruct.LSEState = RCC_LSE_OFF;
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oscinitstruct.HSIState = RCC_HSI_ON;
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oscinitstruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
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oscinitstruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
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oscinitstruct.PLL.PLLState = RCC_PLL_ON;
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oscinitstruct.PLL.PLLSource = RCC_PLLSOURCE_HSI_DIV2;
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oscinitstruct.PLL.PLLMUL = RCC_PLL_MUL16;
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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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static void Error_Handler(void)
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{
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/* Turn LED2 off */
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BSP_LED_Off(LED2);
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while(1)
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{
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}
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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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