mirror of
https://github.com/STMicroelectronics/STM32CubeF1.git
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300 lines
8.6 KiB
C
300 lines
8.6 KiB
C
/**
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******************************************************************************
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* @file Examples_LL/IWDG/IWDG_RefreshUntilUserEvent/Src/main.c
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* @author MCD Application Team
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* @brief This example describes how to configure IWDG down-counter (without Window)
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* using the STM32F1xx IWDG 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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* <h2><center>© Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.</center></h2>
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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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 IWDG_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 ubKeyPressed = 0;
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/* Private function prototypes -----------------------------------------------*/
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void SystemClock_Config(void);
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void Check_IWDG_Reset(void);
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void Configure_IWDG(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 72 MHz */
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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 IWDG reset */
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Check_IWDG_Reset();
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/* Configure the IWDG */
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Configure_IWDG();
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/* Infinite loop */
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while (1)
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{
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if (1 != ubKeyPressed)
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{
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/* Refresh IWDG down-counter to default value */
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LL_IWDG_ReloadCounter(IWDG);
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LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
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/* Note that period used for Counter Reload MUST be higher than blinking timing value*/
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/* This Counter reload timeout period is a function of this value and the
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clock prescaler. Refer to the datasheet for the timeout information */
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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 IWDG
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* @param None
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* @retval None
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*/
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void Configure_IWDG(void)
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{
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/* Enable the peripheral clock of DBG register (uncomment for debug purpose) */
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/* ------------------------------------------------------------------------- */
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/* LL_DBGMCU_APB1_GRP1_FreezePeriph(LL_DBGMCU_APB1_GRP1_IWDG_STOP); */
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/* Enable the peripheral clock IWDG */
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/* -------------------------------- */
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LL_RCC_LSI_Enable();
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while (LL_RCC_LSI_IsReady() != 1)
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{
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}
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/* Configure the IWDG with window option disabled */
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/* ------------------------------------------------------- */
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/* (1) Enable the IWDG by writing 0x0000 CCCC in the IWDG_KR register */
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/* (2) Enable register access by writing 0x0000 5555 in the IWDG_KR register */
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/* (3) Write the IWDG prescaler by programming IWDG_PR from 0 to 7 - LL_IWDG_PRESCALER_4 (0) is lowest divider*/
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/* (4) Write the reload register (IWDG_RLR) */
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/* (5) Wait for the registers to be updated (IWDG_SR = 0x0000 0000) */
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/* (6) Refresh the counter value with IWDG_RLR (IWDG_KR = 0x0000 AAAA) */
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LL_IWDG_Enable(IWDG); /* (1) */
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LL_IWDG_EnableWriteAccess(IWDG); /* (2) */
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LL_IWDG_SetPrescaler(IWDG, LL_IWDG_PRESCALER_4); /* (3) */
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LL_IWDG_SetReloadCounter(IWDG, 0xFEE); /* (4) */
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while (LL_IWDG_IsReady(IWDG) != 1) /* (5) */
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{
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}
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LL_IWDG_ReloadCounter(IWDG); /* (6) */
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}
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/**
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* @brief This function check if the system has resumed from IWDG reset
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* @param None
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* @retval None
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*/
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void Check_IWDG_Reset(void)
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{
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if (LL_RCC_IsActiveFlag_IWDGRST())
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{
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/* clear IWDG 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(ubKeyPressed != 1)
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{
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}
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/* Reset ubKeyPressed value */
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ubKeyPressed = 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 = PLL (HSE)
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* SYSCLK(Hz) = 72000000
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* HCLK(Hz) = 72000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 2
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* APB2 Prescaler = 1
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* HSE Frequency(Hz) = 8000000
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* PLLMUL = 9
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* Flash Latency(WS) = 2
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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_2);
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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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/* Main PLL configuration and activation */
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LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE_DIV_1, LL_RCC_PLL_MUL_9);
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LL_RCC_PLL_Enable();
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while(LL_RCC_PLL_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_1);
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LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
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while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
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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_2);
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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(72000000);
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/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
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LL_SetSystemCoreClock(72000000);
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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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ubKeyPressed = 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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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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