/** ****************************************************************************** * @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 STM32F1xx IWDG LL API. * Peripheral initialization done using LL unitary services functions. ****************************************************************************** * @attention * *

© Copyright (c) 2016 STMicroelectronics. * All rights reserved.

* * This software component is licensed by ST under BSD 3-Clause license, * the "License"; You may not use this file except in compliance with the * License. You may obtain a copy of the License at: * opensource.org/licenses/BSD-3-Clause * ****************************************************************************** */ /* Includes ------------------------------------------------------------------*/ #include "main.h" /** @addtogroup STM32F1xx_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 72 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); /* 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) = 72000000 * HCLK(Hz) = 72000000 * AHB Prescaler = 1 * APB1 Prescaler = 2 * APB2 Prescaler = 1 * HSE Frequency(Hz) = 8000000 * PLLMUL = 9 * Flash Latency(WS) = 2 * @param None * @retval None */ void SystemClock_Config(void) { /* Set FLASH latency */ LL_FLASH_SetLatency(LL_FLASH_LATENCY_2); /* Enable HSE oscillator */ LL_RCC_HSE_EnableBypass(); LL_RCC_HSE_Enable(); while(LL_RCC_HSE_IsReady() != 1) { }; /* Main PLL configuration and activation */ LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE_DIV_1, LL_RCC_PLL_MUL_9); 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 in using frequency set to 72MHz */ LL_Init1msTick(72000000); /* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */ LL_SetSystemCoreClock(72000000); } /******************************************************************************/ /* 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 /** * @} */ /** * @} */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/