mirror of
https://github.com/STMicroelectronics/STM32CubeF0.git
synced 2025-05-01 22:17:59 +08:00
269 lines
8.0 KiB
C
269 lines
8.0 KiB
C
/**
|
|
******************************************************************************
|
|
* @file TIM/TIM_InputCapture/Src/main.c
|
|
* @author MCD Application Team
|
|
* @brief This example shows how to use the TIM peripheral to measure only
|
|
* the frequency of an external signal.
|
|
******************************************************************************
|
|
* @attention
|
|
*
|
|
* <h2><center>© Copyright (c) 2016 STMicroelectronics.
|
|
* All rights reserved.</center></h2>
|
|
*
|
|
* 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 STM32F0xx_HAL_Examples
|
|
* @{
|
|
*/
|
|
|
|
/** @addtogroup TIM_InputCapture
|
|
* @{
|
|
*/
|
|
|
|
/* Private typedef -----------------------------------------------------------*/
|
|
/* Private define ------------------------------------------------------------*/
|
|
/* Private macro -------------------------------------------------------------*/
|
|
/* Private variables ---------------------------------------------------------*/
|
|
/* Timer handler declaration */
|
|
TIM_HandleTypeDef TimHandle;
|
|
|
|
/* Timer Input Capture Configuration Structure declaration */
|
|
TIM_IC_InitTypeDef sICConfig;
|
|
|
|
/* Captured Values */
|
|
uint32_t uwIC2Value1 = 0;
|
|
uint32_t uwIC2Value2 = 0;
|
|
uint32_t uwDiffCapture = 0;
|
|
|
|
/* Capture index */
|
|
uint16_t uhCaptureIndex = 0;
|
|
|
|
/* Frequency Value */
|
|
uint32_t uwFrequency = 0;
|
|
|
|
|
|
/* Private function prototypes -----------------------------------------------*/
|
|
void SystemClock_Config(void);
|
|
static void Error_Handler(void);
|
|
|
|
/* Private functions ---------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Main program
|
|
* @param None
|
|
* @retval None
|
|
*/
|
|
int main(void)
|
|
{
|
|
/* STM32F0xx HAL library initialization:
|
|
- Configure the Flash prefetch
|
|
- Systick timer is configured by default as source of time base, but user
|
|
can eventually implement his proper time base source (a general purpose
|
|
timer for example or other time source), keeping in mind that Time base
|
|
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
|
|
handled in milliseconds basis.
|
|
- Low Level Initialization
|
|
*/
|
|
HAL_Init();
|
|
|
|
/* Configure the system clock to 48 MHz */
|
|
SystemClock_Config();
|
|
|
|
/* Configure LED4 */
|
|
BSP_LED_Init(LED4);
|
|
|
|
/*##-1- Configure the TIM peripheral #######################################*/
|
|
/* TIM1 configuration: Input Capture mode ---------------------
|
|
The external signal is connected to TIM1 CH2 pin (PA.09)
|
|
The Rising edge is used as active edge,
|
|
The TIM1 CCR2 is used to compute the frequency value
|
|
------------------------------------------------------------ */
|
|
|
|
/* Set TIMx instance */
|
|
TimHandle.Instance = TIMx;
|
|
|
|
/* Initialize TIMx peripheral as follows:
|
|
+ Period = 0xFFFF
|
|
+ Prescaler = 0
|
|
+ ClockDivision = 0
|
|
+ Counter direction = Up
|
|
*/
|
|
TimHandle.Init.Period = 0xFFFF;
|
|
TimHandle.Init.Prescaler = 0;
|
|
TimHandle.Init.ClockDivision = 0;
|
|
TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
|
|
TimHandle.Init.RepetitionCounter = 0;
|
|
TimHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
|
|
if(HAL_TIM_IC_Init(&TimHandle) != HAL_OK)
|
|
{
|
|
/* Initialization Error */
|
|
Error_Handler();
|
|
}
|
|
|
|
/*##-2- Configure the Input Capture channel ################################*/
|
|
/* Configure the Input Capture of channel 2 */
|
|
sICConfig.ICPolarity = TIM_ICPOLARITY_RISING;
|
|
sICConfig.ICSelection = TIM_ICSELECTION_DIRECTTI;
|
|
sICConfig.ICPrescaler = TIM_ICPSC_DIV1;
|
|
sICConfig.ICFilter = 0;
|
|
if(HAL_TIM_IC_ConfigChannel(&TimHandle, &sICConfig, TIM_CHANNEL_2) != HAL_OK)
|
|
{
|
|
/* Configuration Error */
|
|
Error_Handler();
|
|
}
|
|
|
|
/*##-3- Start the Input Capture in interrupt mode ##########################*/
|
|
if(HAL_TIM_IC_Start_IT(&TimHandle, TIM_CHANNEL_2) != HAL_OK)
|
|
{
|
|
/* Starting Error */
|
|
Error_Handler();
|
|
}
|
|
|
|
while (1)
|
|
{
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Conversion complete callback in non blocking mode
|
|
* @param htim : hadc handle
|
|
* @retval None
|
|
*/
|
|
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
|
|
{
|
|
if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_2)
|
|
{
|
|
if(uhCaptureIndex == 0)
|
|
{
|
|
/* Get the 1st Input Capture value */
|
|
uwIC2Value1 = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2);
|
|
uhCaptureIndex = 1;
|
|
}
|
|
else if(uhCaptureIndex == 1)
|
|
{
|
|
/* Get the 2nd Input Capture value */
|
|
uwIC2Value2 = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2);
|
|
|
|
/* Capture computation */
|
|
if (uwIC2Value2 > uwIC2Value1)
|
|
{
|
|
uwDiffCapture = (uwIC2Value2 - uwIC2Value1);
|
|
}
|
|
else if (uwIC2Value2 < uwIC2Value1)
|
|
{
|
|
/* 0xFFFF is max TIM1_CCRx value */
|
|
uwDiffCapture = ((0xFFFF - uwIC2Value1) + uwIC2Value2) + 1;
|
|
}
|
|
else
|
|
{
|
|
/* If capture values are equal, we have reached the limit of frequency
|
|
measures */
|
|
Error_Handler();
|
|
}
|
|
/* Frequency computation: for this example TIMx (TIM1) is clocked by
|
|
APB1Clk */
|
|
uwFrequency = HAL_RCC_GetPCLK1Freq() / uwDiffCapture;
|
|
uhCaptureIndex = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief System Clock Configuration
|
|
* The system Clock is configured as follow :
|
|
* System Clock source = PLL (HSE)
|
|
* SYSCLK(Hz) = 48000000
|
|
* HCLK(Hz) = 48000000
|
|
* AHB Prescaler = 1
|
|
* APB1 Prescaler = 1
|
|
* HSE Frequency(Hz) = 8000000
|
|
* PREDIV = 1
|
|
* PLLMUL = 6
|
|
* Flash Latency(WS) = 1
|
|
* @param None
|
|
* @retval None
|
|
*/
|
|
void SystemClock_Config(void)
|
|
{
|
|
RCC_ClkInitTypeDef RCC_ClkInitStruct;
|
|
RCC_OscInitTypeDef RCC_OscInitStruct;
|
|
|
|
/* Select HSE Oscillator as PLL source */
|
|
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
|
|
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
|
|
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
|
|
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
|
|
RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV1;
|
|
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL6;
|
|
if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK)
|
|
{
|
|
/* Initialization Error */
|
|
while(1);
|
|
}
|
|
|
|
/* Select PLL as system clock source and configure the HCLK and PCLK1 clocks dividers */
|
|
RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1);
|
|
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
|
|
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
|
|
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
|
|
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1)!= HAL_OK)
|
|
{
|
|
/* Initialization Error */
|
|
while(1);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief This function is executed in case of error occurrence.
|
|
* @param None
|
|
* @retval None
|
|
*/
|
|
static void Error_Handler(void)
|
|
{
|
|
/* Turn LED4 on */
|
|
BSP_LED_On(LED4);
|
|
while (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\r\n", file, line) */
|
|
|
|
/* Infinite loop */
|
|
while (1)
|
|
{
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
|