【蓝桥杯嵌入式】6_定时器输入捕获

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链接：https://pan.baidu.com/s/1PX2NCQxnADxYBQx5CsOgPA?pwd=3ii2 
提取码：3ii2

这是两个信号发生器，可以通过调节板上的两个电位器R39和R40调节输出频率。

将PB4、PA15选择ch1，两个信号发生器只能选择TIM3和TIM2。

1、频率测量

开启定时器2和定时器3通道1的输入捕获

开启内部时钟，选择输入捕获直接模式，PSC设置为79，ARR设为65535便足够

开启定时器中断

定时器3同上。

1.1 代码

interrupt.c

#include "interrupt.h"double ccr_val1a=0,ccr_val2a=0;
uint frq1=0,frq2=0;//频率void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{if(htim->Instance==TIM2)//判断是否是定时器3触发{if(htim->Channel==HAL_TIM_ACTIVE_CHANNEL_1)//判断是否是通道1触发{ccr_val1a=HAL_TIM_ReadCapturedValue(htim,TIM_CHANNEL_1);//读取计时值,直接__HAL_TIM_SetCounter(htim,0);//计时值清零frq2=(80000000/80)/ccr_val1a;//计算频率HAL_TIM_IC_Start(htim,TIM_CHANNEL_1);//打开通道}}if(htim->Instance==TIM3)//判断是否是定时器3触发{if(htim->Channel==HAL_TIM_ACTIVE_CHANNEL_1)//断是否是通道1触发{ccr_val2a=HAL_TIM_ReadCapturedValue(htim,TIM_CHANNEL_1);//读取计时值,直接__HAL_TIM_SetCounter(htim,0);//计时值清零frq1=(80000000/80)/ccr_val2a;//计算频率HAL_TIM_IC_Start(htim,TIM_CHANNEL_1);//打开通道}}
}

interrupt.h

#ifndef _INTERRUPT_H_
#define _INTERRUPT_H_#include "main.h"
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim);#endif

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 "lcd.h"
#include "interrupt.h"
/* USER CODE END Includes *//* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
void disp_pro(void);
extern uint frq1,frq2;//频率/* 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 *//* 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_TIM3_Init();MX_TIM2_Init();MX_TIM4_Init();/* USER CODE BEGIN 2 */HAL_TIM_IC_Start_IT(&htim2,TIM_CHANNEL_1);//打开定时器2、3的通道1HAL_TIM_IC_Start_IT(&htim3,TIM_CHANNEL_1);LCD_Init();//LCD的初始化  LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){disp_pro();HAL_Delay(100);/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* 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 disp_pro(void)
{char temp[30];sprintf(temp,"  frq1=%d           ",frq1);LCD_DisplayStringLine(Line0, (uchar *)temp);sprintf(temp,"  frq2=%d           ",frq2);LCD_DisplayStringLine(Line2, (uchar *)temp);
}
/* 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 */

2、PWM测量

在频率测量的基础上增加PWM测量

开启定时器2、3通道2的间接捕获模式，并设置为下降沿触发

2.1 代码

interrupt.c

#include "interrupt.h"double ccr_val1a=0,ccr_val2a=0;
uint ccr_val1b=0,ccr_val2b=0;
uint frq1=0,frq2=0;//频率
float duty1=0,duty2=0;//占空比void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{if(htim->Instance==TIM2)//判断是否是定时器3触发{if(htim->Channel==HAL_TIM_ACTIVE_CHANNEL_1)//判断是否是通道1触发{ccr_val1a=HAL_TIM_ReadCapturedValue(htim,TIM_CHANNEL_1);//读取计时值,直接ccr_val1b=HAL_TIM_ReadCapturedValue(htim,TIM_CHANNEL_2);//读取计时值,间接__HAL_TIM_SetCounter(htim,0);//计时值清零frq2=(80000000/80)/ccr_val1a;//计算频率duty2=100*ccr_val1b/ccr_val1a;HAL_TIM_IC_Start(htim,TIM_CHANNEL_1);//打开通道HAL_TIM_IC_Start(htim,TIM_CHANNEL_2);		}}if(htim->Instance==TIM3)//判断是否是定时器3触发{if(htim->Channel==HAL_TIM_ACTIVE_CHANNEL_1)//断是否是通道1触发{ccr_val2a=HAL_TIM_ReadCapturedValue(htim,TIM_CHANNEL_1);//读取计时值,直接ccr_val2b=HAL_TIM_ReadCapturedValue(htim,TIM_CHANNEL_2);//读取计时值,间接__HAL_TIM_SetCounter(htim,0);//计时值清零frq1=(80000000/80)/ccr_val2a;//计算频率duty1=100*ccr_val2b/ccr_val2a;HAL_TIM_IC_Start(htim,TIM_CHANNEL_1);//打开通道HAL_TIM_IC_Start(htim,TIM_CHANNEL_2);}}
}

interrupt.h

#ifndef _INTERRUPT_H_
#define _INTERRUPT_H_#include "main.h"
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim);#endif

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 "lcd.h"
#include "interrupt.h"
/* USER CODE END Includes *//* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
void disp_pro(void);
extern uint frq1,frq2;//频率
extern float duty1,duty2;//占空比
/* 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 *//* 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_TIM3_Init();MX_TIM2_Init();MX_TIM4_Init();/* USER CODE BEGIN 2 */HAL_TIM_IC_Start_IT(&htim2,TIM_CHANNEL_1);//打开定时器2、3的通道1HAL_TIM_IC_Start_IT(&htim3,TIM_CHANNEL_1);LCD_Init();//LCD的初始化  LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){disp_pro();HAL_Delay(100);/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* 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 disp_pro(void)
{char test[30];sprintf(test, "      FRQ1=%d          ",frq1);LCD_DisplayStringLine(Line2, (unsigned char *)test);sprintf(test, "      FRQ2=%d          ",frq2);LCD_DisplayStringLine(Line4, (unsigned char *)test);  sprintf(test, "      DUTY1=%.1f%%          ",duty1);LCD_DisplayStringLine(Line6, (unsigned char *)test);sprintf(test, "      DUTY2=%.1f%%          ",duty2);LCD_DisplayStringLine(Line8, (unsigned char *)test);  
}
/* 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 */