276 lines
7.6 KiB
C
276 lines
7.6 KiB
C
/**
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******************************************************************************
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* @file Examples_LL/WWDG/WWDG_RefreshUntilUserEvent/Src/main.c
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* @author MCD Application Team
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* @brief This example describes how to configure WWDG down-counter (with Window)
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* using the STM32F1xx WWDG LL API.
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* Peripheral initialization done using LL unitary services functions.
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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_LL_Examples
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* @{
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*/
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/** @addtogroup WWDG_RefreshUntilUserEvent
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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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static __IO uint8_t KeyPressed = 0;
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/* Private function prototypes -----------------------------------------------*/
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void SystemClock_Config(void);
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void Check_WWDG_Reset(void);
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void Configure_WWDG(void);
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void LED_Init(void);
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void LED_On(void);
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void UserButton_Init(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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/* Configure the system clock to 2MHz */
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SystemClock_Config();
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/* Initialize LED2 */
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LED_Init();
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/* Initialize button in EXTI mode */
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UserButton_Init();
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/* Check if the system has resumed from WWDG reset*/
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Check_WWDG_Reset();
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/* Configure the WWDG */
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/* - Configure the Window to ~2s */
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/* - Configure the Prescaler */
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/* - Configure the Downcounter to ~2s */
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/* - Enable the WWDG */
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Configure_WWDG();
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/* Infinite loop */
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while (1)
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{
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if (1 != KeyPressed)
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{
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/* Refresh WWDG Downcounter to initial value ~2s*/
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LL_WWDG_SetCounter(WWDG, 0X7E);
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LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
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LL_mDelay(LED_BLINK_FAST);
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}
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}
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}
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/**
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* @brief This function configures WWDG
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* @param None
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* @retval None
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*/
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void Configure_WWDG(void)
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{
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/* Enable the peripheral clock of DBG register (uncomment for debug purpose) */
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/*LL_DBGMCU_APB1_GRP1_FreezePeriph(LL_DBGMCU_APB1_GRP1_WWDG_STOP); */
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/* Enable the peripheral clock WWDG */
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LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_WWDG);
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/* Configure WWDG */
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/* (1) set prescaler to have a rollover each about ~2s */
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/* (2) set window value to same value (~2s) as downcounter in order to ba able to refresh the WWDG almost immediately */
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/* (3) Refresh WWDG before activate it */
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/* (4) Activate WWDG */
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LL_WWDG_SetPrescaler(WWDG, LL_WWDG_PRESCALER_8); /* (1) */
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LL_WWDG_SetWindow(WWDG,0x7E); /* (2) */
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LL_WWDG_SetCounter(WWDG, 0X7E); /* (3) */
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LL_WWDG_Enable(WWDG); /* (4) */
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}
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/**
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* @brief This function check if the system has resumed from WWDG reset
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* @param None
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* @retval None
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*/
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void Check_WWDG_Reset(void)
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{
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if (LL_RCC_IsActiveFlag_WWDGRST())
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{
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/* clear WWDG reset flag */
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LL_RCC_ClearResetFlags();
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/* turn Led on and wait for user event to perform example again */
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LED_On();
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while(KeyPressed != 1)
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{
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}
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/* Reset KeyPressed value */
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KeyPressed = 0;
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}
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}
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/**
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* @brief Initialize LED2.
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* @param None
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* @retval None
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*/
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void LED_Init(void)
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{
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/* Enable the LED2 Clock */
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LED2_GPIO_CLK_ENABLE();
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/* Configure IO in output push-pull mode to drive external LED2 */
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LL_GPIO_SetPinMode(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_MODE_OUTPUT);
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/* Reset value is LL_GPIO_OUTPUT_PUSHPULL */
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//LL_GPIO_SetPinOutputType(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_OUTPUT_PUSHPULL);
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/* Reset value is LL_GPIO_SPEED_FREQ_LOW */
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//LL_GPIO_SetPinSpeed(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_SPEED_FREQ_LOW);
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/* Reset value is LL_GPIO_PULL_NO */
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//LL_GPIO_SetPinPull(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_PULL_NO);
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}
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/**
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* @brief Turn-on LED2.
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* @param None
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* @retval None
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*/
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void LED_On(void)
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{
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/* Turn LED2 on */
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LL_GPIO_SetOutputPin(LED2_GPIO_PORT, LED2_PIN);
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}
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/**
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* @brief Configures User push-button in EXTI Line Mode.
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* @param None
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* @retval None
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*/
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void UserButton_Init(void)
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{
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/* Enable the BUTTON Clock */
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USER_BUTTON_GPIO_CLK_ENABLE();
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/* Configure GPIO for BUTTON */
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LL_GPIO_SetPinMode(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_MODE_INPUT);
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/* Connect External Line to the GPIO*/
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USER_BUTTON_SYSCFG_SET_EXTI();
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/* Enable a rising trigger EXTI line 13 Interrupt */
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USER_BUTTON_EXTI_LINE_ENABLE();
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USER_BUTTON_EXTI_FALLING_TRIG_ENABLE();
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/* Configure NVIC for USER_BUTTON_EXTI_IRQn */
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NVIC_SetPriority(USER_BUTTON_EXTI_IRQn,0x03);
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NVIC_EnableIRQ(USER_BUTTON_EXTI_IRQn);
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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 = HSE
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* SYSCLK(Hz) = 2000000
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* HCLK(Hz) = 2000000
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* AHB Prescaler = 4
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* APB1 Prescaler = 1
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* APB2 Prescaler = 1
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* HSE Frequency(Hz) = 8000000
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* Flash Latency(WS) = 0
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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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/* Set FLASH latency */
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LL_FLASH_SetLatency(LL_FLASH_LATENCY_0);
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/* Enable HSE oscillator */
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LL_RCC_HSE_EnableBypass();
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LL_RCC_HSE_Enable();
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while(LL_RCC_HSE_IsReady() != 1)
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{
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};
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/* Sysclk activation on the main PLL */
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LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_4);
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LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSE);
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while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSE)
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{
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};
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/* Set APB1 & APB2 prescaler*/
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LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
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LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
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/* Set systick to 1ms in using frequency set to 72MHz */
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LL_Init1msTick(2000000);
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/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
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LL_SetSystemCoreClock(2000000);
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}
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/******************************************************************************/
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/* USER IRQ HANDLER TREATMENT */
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/******************************************************************************/
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/**
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* @brief Function to manage IRQ Handler
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* @param None
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* @retval None
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*/
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void UserButton_Callback(void)
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{
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KeyPressed = 1;
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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", 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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