1.原理图
2.Cubemx配置
3.代码
(1) timer.c
#include "timer.h"
unsigned int PUSL1_frq_T2CH2=0;
unsigned int PUSL2_frq_T2CH3=0;
uint32_t uwIC2Value1_T2CH2 = 0;//第一次捕获上升沿的时间
uint32_t uwIC2Value2_T2CH2 = 0;//第二次捕获上升沿的时间
uint32_t uwDiffCapture_T2CH2 = 0;//一个周期所用时间
uint32_t uwIC3Value1_T2CH3 = 0;//第一次捕获上升沿的时间
uint32_t uwIC3Value2_T2CH3 = 0;//第二次捕获上升沿的时间
uint32_t uwDiffCapture_T2CH3 = 0;//一个周期所用时间
uint16_t uhCaptureIndex_T2CH2 = 0;
uint16_t uhCaptureIndex_T2CH3 = 0;
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{
if(htim->Instance==TIM2)
{
if(htim->Channel==HAL_TIM_ACTIVE_CHANNEL_2)
{
if(0==uhCaptureIndex_T2CH2)
{
uwIC2Value1_T2CH2=HAL_TIM_ReadCapturedValue(htim,TIM_CHANNEL_2);//获取第一次捕获上升沿的时间
uhCaptureIndex_T2CH2=1;
}
else if(1==uhCaptureIndex_T2CH2)
{
uwIC2Value2_T2CH2=HAL_TIM_ReadCapturedValue(htim,TIM_CHANNEL_2);//获取第二次捕获上升沿的时间
if(uwIC2Value2_T2CH2>uwIC2Value1_T2CH2)//一个周期所占时间=第二次捕获时间-第一次捕获时间
{
uwDiffCapture_T2CH2=uwIC2Value2_T2CH2-uwIC2Value1_T2CH2;
}
else if(uwIC2Value2_T2CH2<uwIC2Value1_T2CH2)//一个周期所占时间=（重装载值-第一次捕获时间）+第二次捕获时间
{
uwDiffCapture_T2CH2=(0xffffff-uwIC2Value1_T2CH2)+uwIC2Value2_T2CH2;
}
else
{
Error_Handler();
}
//频率=（80MHz/预分频系数）/（一个周期所占时间）
PUSL1_frq_T2CH2=(80000000/80)/uwDiffCapture_T2CH2;
uhCaptureIndex_T2CH2=0;
}
}
else if(htim->Channel==HAL_TIM_ACTIVE_CHANNEL_3)
{
if(0==uhCaptureIndex_T2CH3)
{
uwIC3Value1_T2CH3=HAL_TIM_ReadCapturedValue(htim,TIM_CHANNEL_3);//获取第一次捕获上升沿的时间
uhCaptureIndex_T2CH3=1;
}
else if(1==uhCaptureIndex_T2CH3)
{
uwIC3Value2_T2CH3=HAL_TIM_ReadCapturedValue(htim,TIM_CHANNEL_3);//获取第二次捕获上升沿的时间
if(uwIC3Value2_T2CH3>uwIC3Value1_T2CH3)//一个周期所占时间=第二次捕获时间-第一次捕获时间
{
uwDiffCapture_T2CH3=uwIC3Value2_T2CH3-uwIC3Value1_T2CH3;
}
else if(uwIC3Value2_T2CH3<uwIC3Value1_T2CH3)//一个周期所占时间=（重装载值-第一次捕获时间）+第二次捕获时间
{
uwDiffCapture_T2CH3=(0xffffff-uwIC3Value1_T2CH3)+uwIC3Value2_T2CH3;
}
else
{
Error_Handler();
}
//频率=（80MHz/预分频系数）/（一个周期所占时间）
PUSL2_frq_T2CH3=(80000000/80)/uwDiffCapture_T2CH3;
uhCaptureIndex_T2CH3=0;
}
}
}
}
(2) timer.h
#ifndef __TIMER_H__
#define __TIMER_H__
#include "main.h"
extern unsigned int PUSL1_frq_T2CH2;
extern unsigned int PUSL2_frq_T2CH3;
#endif
(3) main.c
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2024 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "tim.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "stdio.h"
#include "string.h"
#include "lcd.h"
#include "led.h"
#include "timer.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
unsigned char ucled=0x00;
unsigned char lcd_text[30];
__IO uint32_t uwTick_Lcd;
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
void lcd_proc(void);
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_TIM2_Init();
/* USER CODE BEGIN 2 */
LCD_Init();
LCD_Clear(Black);
LCD_SetBackColor(Black);
LCD_SetTextColor(White);
led_disp(ucled);
//开启输入捕获
HAL_TIM_IC_Start_IT(&htim2,TIM_CHANNEL_2);
HAL_TIM_IC_Start_IT(&htim2,TIM_CHANNEL_3);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
lcd_proc();
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
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.PLLM = RCC_PLLM_DIV3;
RCC_OscInitStruct.PLL.PLLN = 20;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
/* USER CODE BEGIN 4 */
void lcd_proc(void)
{
if((uwTick-uwTick_Lcd)<100)return;
uwTick_Lcd=uwTick;
memset(lcd_text,0,sizeof(lcd_text));
sprintf((char *)lcd_text," PULS1_Frq:%dHz ",PUSL1_frq_T2CH2);
LCD_DisplayStringLine(Line2,lcd_text);
memset(lcd_text,0,sizeof(lcd_text));
sprintf((char *)lcd_text," PULS2_Frq:%dHz ",PUSL2_frq_T2CH3);
LCD_DisplayStringLine(Line5,lcd_text);
}
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
__disable_irq();
while (1)
{
}
/* USER CODE END Error_Handler_Debug */
}
#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 CODE BEGIN 6 */
/* 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) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
4.扩展板上跳线帽的连接
