mirror of
https://github.com/STMicroelectronics/STM32CubeF4.git
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307 lines
9.0 KiB
C
307 lines
9.0 KiB
C
/**
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******************************************************************************
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* @file Examples_LL/LPTIM/LPTIM_PulseCounter/Src/main.c
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* @author MCD Application Team
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* @brief This example describes how to use the LPTIM in counter mode
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* using the STM32F4xx LPTIM 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) 2017 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 STM32F4xx_LL_Examples
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* @{
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*/
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/** @addtogroup LPTIM_PulseCounter
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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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/* Private function prototypes -----------------------------------------------*/
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void SystemClock_Config(void);
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void Enable_LSI(void);
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void Configure_LPTIMCounter(void);
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void EnterStop1Mode(void);
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void LED_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 100 MHz */
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SystemClock_Config();
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/* Initialize LED2 */
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LED_Init();
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/* Enable the LSI Clock */
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Enable_LSI();
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/* Configures LPTIM1 in counter mode */
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Configure_LPTIMCounter();
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/* Enter STOP 1 mode */
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EnterStop1Mode();
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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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/**
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* @brief Enable Internal Low Speed Clock (LSI)
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* @param None
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* @retval Status
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*/
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void Enable_LSI(void)
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{
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/* Enable LSI Oscillator */
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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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}
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/**
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* @brief Configures the LPTIM1 instance in counter mode.
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* @note Peripheral configuration is minimal configuration from reset values.
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* Thus, some useless LL unitary functions calls below are provided as
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* commented examples - setting is default configuration from reset.
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* @param None
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* @retval None
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*/
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void Configure_LPTIMCounter(void)
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{
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/***************************************/
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/* Select LSI as LPTIM1 clock source */
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/***************************************/
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LL_RCC_SetLPTIMClockSource(LL_RCC_LPTIM1_CLKSOURCE_LSI);
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/*************************/
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/* GPIO AF configuration */
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/*************************/
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/* Enable the peripheral clock of GPIOs */
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LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOC);
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/* GPIO LPTIM1_IN1 configuration */
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LL_GPIO_SetPinMode(GPIOC, LL_GPIO_PIN_0, LL_GPIO_MODE_ALTERNATE);
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LL_GPIO_SetPinPull(GPIOC, LL_GPIO_PIN_0, LL_GPIO_PULL_DOWN);
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LL_GPIO_SetPinSpeed(GPIOC, LL_GPIO_PIN_0, LL_GPIO_SPEED_FREQ_HIGH);
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LL_GPIO_SetAFPin_0_7(GPIOC, LL_GPIO_PIN_0, LL_GPIO_AF_1);
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/*************************************************/
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/* Configure the NVIC to handle LPTIM1 interrupt */
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/*************************************************/
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NVIC_SetPriority(LPTIM1_IRQn, 0);
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NVIC_EnableIRQ(LPTIM1_IRQn);
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/******************************/
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/* Peripheral clocks enabling */
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/******************************/
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/* Enable the timer peripheral clock */
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LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_LPTIM1);
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/****************************/
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/* LPTIM1 interrupts set-up */
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/****************************/
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/* LPTIM1 Interrupt Configuration: EXTI configuration */
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LL_EXTI_EnableIT_0_31(LL_EXTI_LINE_23);
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LL_EXTI_EnableRisingTrig_0_31(LL_EXTI_LINE_23);
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/* Clear LPTIM1 autoreload match flag */
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LL_LPTIM_ClearFLAG_ARRM(LPTIM1);
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/* Enable the Autoreload match Interrupt */
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LL_LPTIM_EnableIT_ARRM(LPTIM1);
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/*****************************/
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/* LPTIM1 configuration */
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/*****************************/
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/* Set the source of the clock used by the LPTIM instance */
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//LL_LPTIM_SetClockSource(LPTIM1, LL_LPTIM_CLK_SOURCE_INTERNAL);
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/* Set actual prescaler division ratio */
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//LL_LPTIM_SetPrescaler(LPTIM1, LL_LPTIM_PRESCALER_DIV1);
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/* Configure the LPTIM instance output */
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//LL_LPTIM_ConfigOutput(LPTIM1, LL_LPTIM_OUTPUT_WAVEFORM_PWM, LL_LPTIM_OUTPUT_POLARITY_REGULAR);
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/* The counter is incremented following each valid clock pulse on the LPTIM external Input1 */
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LL_LPTIM_SetCounterMode(LPTIM1, LL_LPTIM_COUNTER_MODE_EXTERNAL);
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/*****************************/
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/* Enable the LPTIM1 counter */
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/*****************************/
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LL_LPTIM_Enable(LPTIM1);
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/****************************/
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/* Set the Autoreload value */
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/****************************/
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LL_LPTIM_SetAutoReload(LPTIM1, 1000);
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/************************/
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/* Start LPTIM1 counter */
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/************************/
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/* Start the LPTIM counter in continuous mode */
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LL_LPTIM_StartCounter(LPTIM1, LL_LPTIM_OPERATING_MODE_CONTINUOUS);
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}
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/**
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* @brief Function to configure and enter in STOP 1 Mode.
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* @param None
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* @retval None
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*/
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void EnterStop1Mode(void)
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{
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/* Enter STOP 1 mode */
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LL_PWR_SetPowerMode(LL_PWR_MODE_STOP_MAINREGU);
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/* Set SLEEPDEEP bit of Cortex System Control Register */
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LL_LPM_EnableDeepSleep();
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/* Request Wait For Interrupt */
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__WFI();
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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 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) = 100000000
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* HCLK(Hz) = 100000000
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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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* PLL_M = 8
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* PLL_N = 400
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* PLL_P = 4
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* VDD(V) = 3.3
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* Main regulator output voltage = Scale1 mode
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* Flash Latency(WS) = 3
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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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/* 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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/* Set FLASH latency */
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LL_FLASH_SetLatency(LL_FLASH_LATENCY_3);
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/* Main PLL configuration and activation */
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LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLM_DIV_8, 400, LL_RCC_PLLP_DIV_4);
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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 */
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SysTick_Config(100000000 / 1000);
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/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
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SystemCoreClock = 100000000;
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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 LPTimer Autoreload match interrupt processing
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* @param None
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* @retval None
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*/
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void LPTimerAutoreloadMatch_Callback(void)
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{
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LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
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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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