mirror of
https://github.com/STMicroelectronics/STM32CubeF0.git
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290 lines
8.7 KiB
C
290 lines
8.7 KiB
C
/**
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******************************************************************************
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* @file TIM/TIM_PWMInput/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 the
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* frequency and duty cycle 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 STM32F0xx_HAL_Examples
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* @{
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*/
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/** @addtogroup TIM_PWMInput
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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 sConfig;
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/* Slave configuration structure */
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TIM_SlaveConfigTypeDef sSlaveConfig;
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/* Captured Value */
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__IO uint32_t uwIC2Value = 0;
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/* Duty Cycle Value */
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__IO uint32_t uwDutyCycle = 0;
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/* Frequency Value */
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__IO uint32_t uwFrequency = 0;
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/* Private function prototypes -----------------------------------------------*/
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static 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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/* STM32F0xx 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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- Low Level Initialization
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*/
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HAL_Init();
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/* Configure LED2 */
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BSP_LED_Init(LED2);
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/* Configure the system clock to 48 MHz */
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SystemClock_Config();
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/*##-1- Configure the TIM peripheral #######################################*/
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/* ---------------------------------------------------------------------------
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TIM3 configuration: PWM Input mode
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In this example TIM3 input clock (TIM3CLK) is set to APB1 clock (PCLK1),
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since APB1 prescaler is 1.
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TIM3CLK = PCLK1
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PCLK1 = HCLK
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=> TIM3CLK = HCLK = SystemCoreClock
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External Signal Frequency = TIM3 counter clock / TIM3_CCR2 in Hz.
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External Signal DutyCycle = (TIM3_CCR1*100)/(TIM3_CCR2) in %.
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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 channels ###############################*/
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/* Common configuration */
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sConfig.ICPrescaler = TIM_ICPSC_DIV1;
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sConfig.ICFilter = 0;
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/* Configure the Input Capture of channel 1 */
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sConfig.ICPolarity = TIM_ICPOLARITY_FALLING;
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sConfig.ICSelection = TIM_ICSELECTION_INDIRECTTI;
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if (HAL_TIM_IC_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_1) != 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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/* Configure the Input Capture of channel 2 */
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sConfig.ICPolarity = TIM_ICPOLARITY_RISING;
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sConfig.ICSelection = TIM_ICSELECTION_DIRECTTI;
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if (HAL_TIM_IC_ConfigChannel(&TimHandle, &sConfig, 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- Configure the slave mode ###########################################*/
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/* Select the slave Mode: Reset Mode */
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sSlaveConfig.SlaveMode = TIM_SLAVEMODE_RESET;
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sSlaveConfig.InputTrigger = TIM_TS_TI2FP2;
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sSlaveConfig.TriggerPolarity = TIM_TRIGGERPOLARITY_NONINVERTED;
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sSlaveConfig.TriggerPrescaler = TIM_TRIGGERPRESCALER_DIV1;
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sSlaveConfig.TriggerFilter = 0;
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if (HAL_TIM_SlaveConfigSynchro(&TimHandle, &sSlaveConfig) != 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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/*##-4- 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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/*##-5- Start the Input Capture in interrupt mode ##########################*/
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if (HAL_TIM_IC_Start_IT(&TimHandle, TIM_CHANNEL_1) != 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 Input Capture callback in non blocking mode
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* @param htim : TIM IC 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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/* Get the Input Capture value */
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uwIC2Value = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2);
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if (uwIC2Value != 0)
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{
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/* Duty cycle computation */
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uwDutyCycle = ((HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1)) * 100) / uwIC2Value;
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/* uwFrequency computation
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TIM3 counter clock = (RCC_Clocks.HCLK_Frequency) */
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uwFrequency = (HAL_RCC_GetHCLKFreq()) / uwIC2Value;
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}
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else
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{
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uwDutyCycle = 0;
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uwFrequency = 0;
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}
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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 LED2 on */
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BSP_LED_On(LED2);
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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 System Clock Configuration
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* The system Clock is configured as follow :
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* System Clock source = PLL (HSI48)
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* SYSCLK(Hz) = 48000000
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* HCLK(Hz) = 48000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 1
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* HSI Frequency(Hz) = 48000000
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* PREDIV = 2
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* PLLMUL = 2
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* Flash Latency(WS) = 1
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* @param None
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* @retval None
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*/
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static void SystemClock_Config(void)
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{
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RCC_ClkInitTypeDef RCC_ClkInitStruct;
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RCC_OscInitTypeDef RCC_OscInitStruct;
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/* Select HSI48 Oscillator as PLL source */
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RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48;
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RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
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RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
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RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI48;
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RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV2;
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RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL2;
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if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK)
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{
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Error_Handler();
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}
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/* Select PLL as system clock source and configure the HCLK and PCLK1 clocks dividers */
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RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1);
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RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
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RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
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RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
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if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1)!= HAL_OK)
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{
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Error_Handler();
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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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