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/**
******************************************************************************
* @file Examples_LL/IWDG/IWDG_RefreshUntilUserEvent/Src/main.c
* @author MCD Application Team
* @brief This example describes how to configure IWDG down-counter (without Window)
* using the STM32F4xx IWDG 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 IWDG_RefreshUntilUserEvent
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static __IO uint8_t ubKeyPressed = 0;
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void Check_IWDG_Reset(void);
void Configure_IWDG(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 100 MHz */
SystemClock_Config();
/* Initialize LED2 */
LED_Init();
/* Initialize button in EXTI mode */
UserButton_Init();
/* Check if the system has resumed from IWDG reset */
Check_IWDG_Reset();
/* Configure the IWDG */
Configure_IWDG();
/* Infinite loop */
while (1)
{
if (1 != ubKeyPressed)
{
/* Refresh IWDG down-counter to default value */
LL_IWDG_ReloadCounter(IWDG);
LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
/* Note that period used for Counter Reload MUST be higher than blinking timing value*/
/* This Counter reload timeout period is a function of this value and the
clock prescaler. Refer to the datasheet for the timeout information */
LL_mDelay(LED_BLINK_FAST);
}
}
}
/**
* @brief This function configures IWDG
* @param None
* @retval None
*/
void Configure_IWDG(void)
{
/* Enable the peripheral clock of DBG register (uncomment for debug purpose) */
/* ------------------------------------------------------------------------- */
/* LL_DBGMCU_APB1_GRP1_FreezePeriph(LL_DBGMCU_APB1_GRP1_IWDG_STOP); */
/* Enable the peripheral clock IWDG */
/* -------------------------------- */
LL_RCC_LSI_Enable();
while (LL_RCC_LSI_IsReady() != 1)
{
}
/* Configure the IWDG with window option disabled */
/* ------------------------------------------------------- */
/* (1) Enable the IWDG by writing 0x0000 CCCC in the IWDG_KR register */
/* (2) Enable register access by writing 0x0000 5555 in the IWDG_KR register */
/* (3) Write the IWDG prescaler by programming IWDG_PR from 0 to 7 - LL_IWDG_PRESCALER_4 (0) is lowest divider*/
/* (4) Write the reload register (IWDG_RLR) */
/* (5) Wait for the registers to be updated (IWDG_SR = 0x0000 0000) */
/* (6) Refresh the counter value with IWDG_RLR (IWDG_KR = 0x0000 AAAA) */
LL_IWDG_Enable(IWDG); /* (1) */
LL_IWDG_EnableWriteAccess(IWDG); /* (2) */
LL_IWDG_SetPrescaler(IWDG, LL_IWDG_PRESCALER_4); /* (3) */
LL_IWDG_SetReloadCounter(IWDG, 0xFEE); /* (4) */
while (LL_IWDG_IsReady(IWDG) != 1) /* (5) */
{
}
LL_IWDG_ReloadCounter(IWDG); /* (6) */
}
/**
* @brief This function check if the system has resumed from IWDG reset
* @param None
* @retval None
*/
void Check_IWDG_Reset(void)
{
if (LL_RCC_IsActiveFlag_IWDGRST())
{
/* clear IWDG reset flag */
LL_RCC_ClearResetFlags();
/* turn Led on and wait for user event to perform example again */
LED_On();
while(ubKeyPressed != 1)
{
}
/* Reset ubKeyPressed value */
ubKeyPressed = 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 = PLL (HSE)
* SYSCLK(Hz) = 100000000
* HCLK(Hz) = 100000000
* AHB Prescaler = 1
* APB1 Prescaler = 2
* APB2 Prescaler = 1
* HSE Frequency(Hz) = 8000000
* PLL_M = 8
* PLL_N = 400
* PLL_P = 4
* VDD(V) = 3.3
* Main regulator output voltage = Scale1 mode
* Flash Latency(WS) = 3
* @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_3);
/* Main PLL configuration and activation */
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLM_DIV_8, 400, LL_RCC_PLLP_DIV_4);
LL_RCC_PLL_Enable();
while(LL_RCC_PLL_IsReady() != 1)
{
};
/* Sysclk activation on the main PLL */
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
{
};
/* Set APB1 & APB2 prescaler */
LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);
LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
/* Set systick to 1ms */
SysTick_Config(100000000 / 1000);
/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
SystemCoreClock = 100000000;
}
/******************************************************************************/
/* USER IRQ HANDLER TREATMENT */
/******************************************************************************/
/**
* @brief Function to manage IRQ Handler
* @param None
* @retval None
*/
void UserButton_Callback(void)
{
ubKeyPressed = 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
/**
* @}
*/
/**
* @}
*/