mirror of
https://github.com/STMicroelectronics/STM32CubeF4.git
synced 2025-04-30 13:48:52 +08:00
279 lines
7.7 KiB
C
279 lines
7.7 KiB
C
/**
|
|
******************************************************************************
|
|
* @file Examples_LL/WWDG/WWDG_RefreshUntilUserEvent/Src/main.c
|
|
* @author MCD Application Team
|
|
* @brief This example describes how to configure WWDG down-counter (with Window)
|
|
* using the STM32F4xx WWDG LL API.
|
|
* Peripheral initialization done using LL unitary services functions.
|
|
******************************************************************************
|
|
* @attention
|
|
*
|
|
* Copyright (c) 2017 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 STM32F4xx_LL_Examples
|
|
* @{
|
|
*/
|
|
|
|
/** @addtogroup WWDG_RefreshUntilUserEvent
|
|
* @{
|
|
*/
|
|
|
|
/* Private typedef -----------------------------------------------------------*/
|
|
/* Private define ------------------------------------------------------------*/
|
|
/* Private macro -------------------------------------------------------------*/
|
|
/* Private variables ---------------------------------------------------------*/
|
|
static __IO uint8_t KeyPressed = 0;
|
|
/* Private function prototypes -----------------------------------------------*/
|
|
void SystemClock_Config(void);
|
|
void Check_WWDG_Reset(void);
|
|
void Configure_WWDG(void);
|
|
void LED_Init(void);
|
|
void LED_On(void);
|
|
void UserButton_Init(void);
|
|
|
|
/* Private functions ---------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Main program
|
|
* @param None
|
|
* @retval None
|
|
*/
|
|
int main(void)
|
|
{
|
|
/* Configure the system clock to 2MHz */
|
|
SystemClock_Config();
|
|
|
|
/* Initialize LED2 */
|
|
LED_Init();
|
|
|
|
/* Initialize button in EXTI mode */
|
|
UserButton_Init();
|
|
|
|
/* Check if the system has resumed from WWDG reset*/
|
|
Check_WWDG_Reset();
|
|
|
|
/* Configure the WWDG */
|
|
/* - Configure the Window to ~2s */
|
|
/* - Configure the Prescaler */
|
|
/* - Configure the Downcounter to ~2s */
|
|
/* - Enable the WWDG */
|
|
Configure_WWDG();
|
|
|
|
/* Infinite loop */
|
|
while (1)
|
|
{
|
|
if (1 != KeyPressed)
|
|
{
|
|
/* Refresh WWDG Downcounter to initial value ~2s*/
|
|
LL_WWDG_SetCounter(WWDG, 0X7E);
|
|
|
|
LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
|
|
LL_mDelay(LED_BLINK_FAST);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief This function configures WWDG
|
|
* @param None
|
|
* @retval None
|
|
*/
|
|
void Configure_WWDG(void)
|
|
{
|
|
/* Enable the peripheral clock of DBG register (uncomment for debug purpose) */
|
|
/*LL_DBGMCU_APB1_GRP1_FreezePeriph(LL_DBGMCU_APB1_GRP1_WWDG_STOP); */
|
|
|
|
/* Enable the peripheral clock WWDG */
|
|
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_WWDG);
|
|
|
|
/* Configure WWDG */
|
|
/* (1) set prescaler to have a rollover each about ~2s */
|
|
/* (2) set window value to same value (~2s) as downcounter in order to ba able to refresh the WWDG almost immediately */
|
|
/* (3) Refresh WWDG before activate it */
|
|
/* (4) Activate WWDG */
|
|
LL_WWDG_SetPrescaler(WWDG, LL_WWDG_PRESCALER_8); /* (1) */
|
|
LL_WWDG_SetWindow(WWDG,0x7E); /* (2) */
|
|
LL_WWDG_SetCounter(WWDG, 0X7E); /* (3) */
|
|
LL_WWDG_Enable(WWDG); /* (4) */
|
|
}
|
|
|
|
/**
|
|
* @brief This function check if the system has resumed from WWDG reset
|
|
* @param None
|
|
* @retval None
|
|
*/
|
|
void Check_WWDG_Reset(void)
|
|
{
|
|
if (LL_RCC_IsActiveFlag_WWDGRST())
|
|
{
|
|
/* clear WWDG reset flag */
|
|
LL_RCC_ClearResetFlags();
|
|
|
|
/* turn Led on and wait for user event to perform example again */
|
|
LED_On();
|
|
|
|
while(KeyPressed != 1)
|
|
{
|
|
}
|
|
|
|
/* Reset KeyPressed value */
|
|
KeyPressed = 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Initialize LED2.
|
|
* @param None
|
|
* @retval None
|
|
*/
|
|
void LED_Init(void)
|
|
{
|
|
/* Enable the LED2 Clock */
|
|
LED2_GPIO_CLK_ENABLE();
|
|
|
|
/* Configure IO in output push-pull mode to drive external LED2 */
|
|
LL_GPIO_SetPinMode(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_MODE_OUTPUT);
|
|
/* Reset value is LL_GPIO_OUTPUT_PUSHPULL */
|
|
//LL_GPIO_SetPinOutputType(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_OUTPUT_PUSHPULL);
|
|
/* Reset value is LL_GPIO_SPEED_FREQ_LOW */
|
|
//LL_GPIO_SetPinSpeed(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_SPEED_FREQ_LOW);
|
|
/* Reset value is LL_GPIO_PULL_NO */
|
|
//LL_GPIO_SetPinPull(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_PULL_NO);
|
|
}
|
|
|
|
/**
|
|
* @brief Turn-on LED2.
|
|
* @param None
|
|
* @retval None
|
|
*/
|
|
void LED_On(void)
|
|
{
|
|
/* Turn LED2 on */
|
|
LL_GPIO_SetOutputPin(LED2_GPIO_PORT, LED2_PIN);
|
|
}
|
|
|
|
/**
|
|
* @brief Configures User push-button in EXTI Line Mode.
|
|
* @param None
|
|
* @retval None
|
|
*/
|
|
void UserButton_Init(void)
|
|
{
|
|
/* Enable the BUTTON Clock */
|
|
USER_BUTTON_GPIO_CLK_ENABLE();
|
|
|
|
/* Configure GPIO for BUTTON */
|
|
LL_GPIO_SetPinMode(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_MODE_INPUT);
|
|
LL_GPIO_SetPinPull(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_PULL_NO);
|
|
/* Connect External Line to the GPIO*/
|
|
USER_BUTTON_SYSCFG_SET_EXTI();
|
|
|
|
/* Enable a rising trigger EXTI line 13 Interrupt */
|
|
USER_BUTTON_EXTI_LINE_ENABLE();
|
|
USER_BUTTON_EXTI_FALLING_TRIG_ENABLE();
|
|
|
|
/* Configure NVIC for USER_BUTTON_EXTI_IRQn */
|
|
NVIC_SetPriority(USER_BUTTON_EXTI_IRQn,0x03);
|
|
NVIC_EnableIRQ(USER_BUTTON_EXTI_IRQn);
|
|
}
|
|
|
|
/**
|
|
* @brief System Clock Configuration
|
|
* The system Clock is configured as follow :
|
|
* System Clock source = HSE
|
|
* SYSCLK(Hz) = 8000000
|
|
* HCLK(Hz) = 2000000
|
|
* AHB Prescaler = 4
|
|
* APB1 Prescaler = 1
|
|
* APB2 Prescaler = 1
|
|
* HSE Frequency(Hz) = 8000000
|
|
* VDD(V) = 3.3
|
|
* Main regulator output voltage = Scale1 mode
|
|
* Flash Latency(WS) = 0
|
|
* @param None
|
|
* @retval None
|
|
*/
|
|
void SystemClock_Config(void)
|
|
{
|
|
/* Enable HSE oscillator */
|
|
LL_RCC_HSE_EnableBypass();
|
|
LL_RCC_HSE_Enable();
|
|
while(LL_RCC_HSE_IsReady() != 1)
|
|
{
|
|
};
|
|
|
|
/* Set FLASH latency */
|
|
LL_FLASH_SetLatency(LL_FLASH_LATENCY_0);
|
|
|
|
/* Sysclk activation on the main PLL */
|
|
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_4);
|
|
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSE);
|
|
while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSE)
|
|
{
|
|
};
|
|
|
|
/* Set APB1 & APB2 prescaler */
|
|
LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
|
|
LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
|
|
|
|
/* Set systick to 1ms */
|
|
SysTick_Config(2000000 / 1000);
|
|
|
|
/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
|
|
SystemCoreClock = 2000000;
|
|
}
|
|
|
|
|
|
/******************************************************************************/
|
|
/* USER IRQ HANDLER TREATMENT */
|
|
/******************************************************************************/
|
|
/**
|
|
* @brief Function to manage IRQ Handler
|
|
* @param None
|
|
* @retval None
|
|
*/
|
|
void UserButton_Callback(void)
|
|
{
|
|
KeyPressed = 1;
|
|
}
|
|
|
|
#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", file, line) */
|
|
|
|
/* Infinite loop */
|
|
while (1)
|
|
{
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/**
|
|
* @}
|
|
*/
|