274 lines
8.2 KiB
C
274 lines
8.2 KiB
C
/**
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******************************************************************************
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* @file TIM/TIM_InputCapture/Src/main.c
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* @author MCD Application Team
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* @brief This example shows how to use the TIM peripheral to measure only
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* the frequency of an external signal.
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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_HAL_Examples
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* @{
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*/
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/** @addtogroup TIM_InputCapture
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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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/* Timer handler declaration */
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TIM_HandleTypeDef TimHandle;
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/* Timer Input Capture Configuration Structure declaration */
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TIM_IC_InitTypeDef sICConfig;
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/* Captured Values */
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uint32_t uwIC2Value1 = 0;
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uint32_t uwIC2Value2 = 0;
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uint32_t uwDiffCapture = 0;
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/* Capture index */
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uint16_t uhCaptureIndex = 0;
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/* Frequency Value */
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uint32_t uwFrequency = 0;
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/* Private function prototypes -----------------------------------------------*/
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void SystemClock_Config(void);
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static void Error_Handler(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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/* STM32F103xG HAL library initialization:
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- Configure the Flash prefetch
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- Systick timer is configured by default as source of time base, but user
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can eventually implement his proper time base source (a general purpose
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timer for example or other time source), keeping in mind that Time base
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duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
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handled in milliseconds basis.
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- Set NVIC Group Priority to 4
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- Low Level Initialization
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*/
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HAL_Init();
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/* Configure the system clock to 72 MHz */
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SystemClock_Config();
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/* Configure LED3 */
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BSP_LED_Init(LED3);
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/*##-1- Configure the TIM peripheral #######################################*/
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/* TIM2 configuration: Input Capture mode ---------------------
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The external signal is connected to TIM2 CH2 pin (PA.01)
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The Rising edge is used as active edge,
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The TIM2 CCR2 is used to compute the frequency value
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------------------------------------------------------------ */
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/* Set TIMx instance */
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TimHandle.Instance = TIMx;
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/* Initialize TIMx peripheral as follows:
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+ Period = 0xFFFF
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+ Prescaler = 0
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+ ClockDivision = 0
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+ Counter direction = Up
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*/
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TimHandle.Init.Period = 0xFFFF;
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TimHandle.Init.Prescaler = 0;
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TimHandle.Init.ClockDivision = 0;
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TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
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TimHandle.Init.RepetitionCounter = 0;
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TimHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
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if(HAL_TIM_IC_Init(&TimHandle) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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/*##-2- Configure the Input Capture channel ################################*/
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/* Configure the Input Capture of channel 2 */
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sICConfig.ICPolarity = TIM_ICPOLARITY_RISING;
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sICConfig.ICSelection = TIM_ICSELECTION_DIRECTTI;
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sICConfig.ICPrescaler = TIM_ICPSC_DIV1;
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sICConfig.ICFilter = 0;
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if(HAL_TIM_IC_ConfigChannel(&TimHandle, &sICConfig, TIM_CHANNEL_2) != HAL_OK)
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{
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/* Configuration Error */
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Error_Handler();
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}
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/*##-3- Start the Input Capture in interrupt mode ##########################*/
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if(HAL_TIM_IC_Start_IT(&TimHandle, TIM_CHANNEL_2) != HAL_OK)
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{
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/* Starting Error */
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Error_Handler();
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}
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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 Conversion complete callback in non blocking mode
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* @param htim : hadc handle
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* @retval None
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*/
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void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
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{
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if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_2)
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{
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if(uhCaptureIndex == 0)
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{
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/* Get the 1st Input Capture value */
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uwIC2Value1 = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2);
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uhCaptureIndex = 1;
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}
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else if(uhCaptureIndex == 1)
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{
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/* Get the 2nd Input Capture value */
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uwIC2Value2 = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2);
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/* Capture computation */
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if (uwIC2Value2 > uwIC2Value1)
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{
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uwDiffCapture = (uwIC2Value2 - uwIC2Value1);
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}
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else if (uwIC2Value2 < uwIC2Value1)
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{
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/* 0xFFFF is max TIM2_CCRx value */
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uwDiffCapture = ((0xFFFF - uwIC2Value1) + uwIC2Value2) + 1;
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}
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else
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{
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/* If capture values are equal, we have reached the limit of frequency
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measures */
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Error_Handler();
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}
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/* Frequency computation: for this example TIMx (TIM2) is clocked by
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APB1Clk */
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uwFrequency = HAL_RCC_GetPCLK1Freq() / uwDiffCapture;
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uhCaptureIndex = 0;
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}
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}
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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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* HSE PREDIV1 = 1
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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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RCC_ClkInitTypeDef clkinitstruct = {0};
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RCC_OscInitTypeDef oscinitstruct = {0};
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/* Enable HSE Oscillator and activate PLL with HSE as source */
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oscinitstruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
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oscinitstruct.HSEState = RCC_HSE_ON;
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oscinitstruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
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oscinitstruct.PLL.PLLState = RCC_PLL_ON;
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oscinitstruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
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oscinitstruct.PLL.PLLMUL = RCC_PLL_MUL9;
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if (HAL_RCC_OscConfig(&oscinitstruct)!= HAL_OK)
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{
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/* Initialization Error */
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while(1);
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}
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/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
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clocks dividers */
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clkinitstruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
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clkinitstruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
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clkinitstruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
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clkinitstruct.APB2CLKDivider = RCC_HCLK_DIV1;
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clkinitstruct.APB1CLKDivider = RCC_HCLK_DIV2;
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if (HAL_RCC_ClockConfig(&clkinitstruct, FLASH_LATENCY_2)!= HAL_OK)
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{
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/* Initialization Error */
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while(1);
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}
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}
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/**
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* @brief This function is executed in case of error occurrence.
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* @param None
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* @retval None
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*/
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static void Error_Handler(void)
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{
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/* Turn LED3 on */
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BSP_LED_On(LED3);
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while (1)
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{
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}
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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\r\n", 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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