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STM32CubeF7/Projects/STM32F723E-Discovery/Examples/WWDG/WWDG_Example/Src/main.c
rihab kouki f8cefdf02e Release v1.16.2
2021-12-14 09:57:38 +01:00

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/**
******************************************************************************
* @file WWDG/WWDG_Example/Src/main.c
* @author MCD Application Team
* @brief This sample code shows how to use the STM32F722xx/STM32F723xx/STM32F732xx/STM32F733xx WWDG HAL API
* to update at regular period the WWDG counter and how to generate
* a software fault generating an MCU WWDG reset on expiry of a
* programmed time period.
******************************************************************************
* @attention
*
* Copyright (c) 2016 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/** @addtogroup STM32F7xx_HAL_Examples
* @{
*/
/** @addtogroup WWDG_Example
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* WWDG handler declaration */
static WWDG_HandleTypeDef WwdgHandle;
/* Private function prototypes -----------------------------------------------*/
static void MPU_Config(void);
static uint32_t TimeoutCalculation(uint32_t timevalue);
void SystemClock_Config(void);
static void Error_Handler(void);
static void CPU_CACHE_Enable(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
uint32_t delay;
/* Configure the MPU attributes */
MPU_Config();
/* Enable the CPU Cache */
CPU_CACHE_Enable();
/* STM32F7xx HAL library initialization:
- Configure the Flash ART accelerator
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Set NVIC Group Priority to 4
- Low Level Initialization
*/
HAL_Init();
/* Configure the system clock to 216 MHz */
SystemClock_Config();
/* Configure LED6 and LED5 */
BSP_LED_Init(LED6);
BSP_LED_Init(LED5);
/*##-1- Check if the system has resumed from WWDG reset ####################*/
if (__HAL_RCC_GET_FLAG(RCC_FLAG_WWDGRST) != RESET)
{
/* WWDGRST flag set: Turn LED6 on */
BSP_LED_On(LED6);
/* Insert 4s delay */
HAL_Delay(4000);
/* Prior to clear WWDGRST flag: Turn LED6 off */
BSP_LED_Off(LED6);
}
/* Clear reset flags in any case */
__HAL_RCC_CLEAR_RESET_FLAGS();
/* Configure User/WakeUp push-button */
BSP_PB_Init(BUTTON_USER, BUTTON_MODE_EXTI);
/*##-2- Init & Start WWDG peripheral ######################################*/
/* Configuration:
1] Set WWDG counter to maximum 0x7F (127 cycles) and window to 0x50 (80 cycles)
2] Set Prescaler to 8 (2^3)
Timing calculation:
a) WWDG clock counter period (in ms) = (4096 * 8) / (PCLK1 / 1000)
= 0,1517 ms
b) WWDG timeout (in ms) = (127 + 1) * 0,1517
~= 19,42 ms
=> After refresh, WWDG will expire after 19,42 ms and generate reset if counter is not reloaded.
c) Time to enter inside window
Window timeout (in ms) = (127 - 80 + 1) * 0,1517
= 6,978 ms */
WwdgHandle.Instance = WWDG;
WwdgHandle.Init.Prescaler = WWDG_PRESCALER_8;
WwdgHandle.Init.Window = 0x50;
WwdgHandle.Init.Counter = 0x7F;
WwdgHandle.Init.EWIMode = WWDG_EWI_DISABLE;
if (HAL_WWDG_Init(&WwdgHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* calculate delay to enter window. Add 1ms to secure round number to upper number */
delay = TimeoutCalculation((WwdgHandle.Init.Counter-WwdgHandle.Init.Window) + 1) + 1;
/* Infinite loop */
while (1)
{
/* Toggle LED5 */
BSP_LED_Toggle(LED5);
/* Insert calculated delay */
HAL_Delay(delay);
if (HAL_WWDG_Refresh(&WwdgHandle) != HAL_OK)
{
Error_Handler();
}
}
}
/**
* @brief Timeout calculation function.
* This function calculates any timeout related to
* WWDG with given prescaler and system clock.
* @param timevalue: period in term of WWDG counter cycle.
* @retval None
*/
static uint32_t TimeoutCalculation(uint32_t timevalue)
{
uint32_t timeoutvalue = 0;
uint32_t pclk1 = 0;
uint32_t wdgtb = 0;
/* considering APB divider is still 1, use HCLK value */
pclk1 = HAL_RCC_GetPCLK1Freq();
/* get prescaler */
wdgtb = (1 << ((WwdgHandle.Init.Prescaler) >> 7)); /* 2^WDGTB[1:0] */
/* calculate timeout */
timeoutvalue = ((4096 * wdgtb * timevalue) / (pclk1 / 1000));
return timeoutvalue;
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 216000000
* HCLK(Hz) = 216000000
* AHB Prescaler = 1
* APB1 Prescaler = 4
* APB2 Prescaler = 2
* HSE Frequency(Hz) = 25000000
* PLL_M = 25
* PLL_N = 432
* PLL_P = 2
* PLL_Q = 9
* VDD(V) = 3.3
* Main regulator output voltage = Scale1 mode
* Flash Latency(WS) = 7
* @param None
* @retval None
*/
void SystemClock_Config(void)
{
RCC_ClkInitTypeDef RCC_ClkInitStruct;
RCC_OscInitTypeDef RCC_OscInitStruct;
/* Enable HSE Oscillator and activate PLL with HSE as source */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 25;
RCC_OscInitStruct.PLL.PLLN = 432;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = 9;
if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
while(1) {};
}
/* Activate the OverDrive to reach the 216 Mhz Frequency */
if(HAL_PWREx_EnableOverDrive() != HAL_OK)
{
while(1) {};
}
/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
clocks dividers */
RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7) != HAL_OK)
{
while(1) {};
}
}
/**
* @brief This function is executed in case of error occurrence.
* @param None
* @retval None
*/
static void Error_Handler(void)
{
/* Turn LED5 on */
BSP_LED_On(LED5);
while(1)
{
}
}
/**
* @brief CPU L1-Cache enable.
* @param None
* @retval None
*/
static void CPU_CACHE_Enable(void)
{
/* Enable I-Cache */
SCB_EnableICache();
/* Enable D-Cache */
SCB_EnableDCache();
}
/**
* @brief Configure the MPU attributes
* @param None
* @retval None
*/
static void MPU_Config(void)
{
MPU_Region_InitTypeDef MPU_InitStruct;
/* Disable the MPU */
HAL_MPU_Disable();
/* Configure the MPU as Strongly ordered for not defined regions */
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.BaseAddress = 0x00;
MPU_InitStruct.Size = MPU_REGION_SIZE_4GB;
MPU_InitStruct.AccessPermission = MPU_REGION_NO_ACCESS;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
MPU_InitStruct.Number = MPU_REGION_NUMBER0;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
MPU_InitStruct.SubRegionDisable = 0x87;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
/* Enable the MPU */
HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/
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