建设部官方网站,南昌抖音推广公司,h5跟传统网站有啥区别,网站开发提供的服务STM32 HAL库定时器输入捕获SlaveMode脉宽测量 SlaveMode模式简介 ✨SlaveMode复位模式#xff1a;在发生一个触发输入事件时#xff0c;计数器和它的预分频器能够重新被初始化#xff1b;同时#xff0c;如果TIMx_CR1寄存器的URS位为低#xff0c;还会产生一个更新事件UEV… STM32 HAL库定时器输入捕获SlaveMode脉宽测量 SlaveMode模式简介 ✨SlaveMode复位模式在发生一个触发输入事件时计数器和它的预分频器能够重新被初始化同时如果TIMx_CR1寄存器的URS位为低还会产生一个更新事件UEV然后所有的预装载寄存器(TIMx_ARR TIMx_CCRx)都会被更新。 当所测频率低于最小定时器捕获频率时需要使能自动重装载和定时器溢出中断。 SlaveMode模式下当输入捕获引脚接收到脉冲的上降沿信号时产生复位并从零开始重新计数。 一个周期内的总计数输入捕获上下升沿信号开始到下一个上(下)升沿结束总计数个数 C N T N ∗ ( A R R 1 ) C R R 1 CNTN*(ARR1)CRR1 CNTN∗(ARR1)CRR1 N:定时器溢出次数 ARR:TIMx预装载值 TIMx-CRR1寄存器计数值 定时器计数频率 f F o s c / ( p s c 1 ) f Fosc/(psc1) fFosc/(psc1) Fosc:定时器的频率主时钟频率 psc分频系数 计一个数时间 T 1 ÷ f T 1 \div f T1÷f 1 f \frac{1}f f1CNT总计数时间 C N T × T CNT \times T CNT×T脉宽宽度等于上升沿开始到下一个下降沿之间的计数值: C C R 2 ∗ 1 f CCR2*\frac{1}f CCR2∗f1
PWM主要参数
频率是指1秒钟内信号从高电平到低电平再回到高电平的次数(一个周期)占空比一个脉冲周期内高电平的时间与整个周期时间的比例。
输入捕获SlaveMode脉宽测量
输入捕获到的PWM信号频率 1 / C N T ∗ T 1 / C N T ∗ ( 1 / f ) f / C N T 1/CNT*T 1/CNT*(1/f) f/CNT 1/CNT∗T1/CNT∗(1/f)f/CNTPWM占空比 C R R 2 ÷ C N T CRR2 \div CNT CRR2÷CNT
最小捕获频率计算
定时器频率: f / p s c f/psc f/psc 如果STM32以72MHz主频,定时器分频系数为36定时器的时钟频率为2MHz。 PSC定时器TIMx-PSC f / ( p s c − 1 ) f/(psc-1) f/(psc−1)
在没有开启溢出中断的情况下最小捕获频率 2000000 ÷ 65535 ≈ 15.25 H z 2000 000 \div 65535 \approx 15.25Hz 2000000÷65535≈15.25Hz 如果开启了溢出中断那么捕获频率就不受限制。 开启溢出中断的情况下捕获频率 2000000 ÷ N ∗ ( A R R 1 ) C R R 1 2000 000 \div N*(ARR1)CRR1 2000000÷N∗(ARR1)CRR1 其中N代表溢出次数ARR代表装载值 如果被测量的频率低于1Hz那么测量就没有多大意义了。 输入捕获SlaveMode脉宽测量例程 使用STM32F1利用TIM3通道1产生PWM输出信号使用TIM2定时器作为信号输入捕获并开启SlaveMode模式设置为ReSet Mode,同时开启两路极性互补输入捕获。 接线说明PA6 PWM输出引脚和PA0输入捕获引脚连接到一起即可进行测量。 TIM2输入捕获配置 TIM3配置输出PWM占空比和频率可以行调整测试。 main程序代码
/* USER CODE BEGIN Header */
/********************************************************************************* file : main.c* brief : Main program body******************************************************************************* attention** Copyright (c) 2023 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 usart.h
#include gpio.h/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include stdio.h
#include string.h
/* USER CODE END Includes *//* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD *//* 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 */uint8_t USART_TX_Buff[32] {0};uint16_t Duty, Duty_High, ARR, PWM_f;/* 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();MX_TIM3_Init();MX_USART1_UART_Init();/* USER CODE BEGIN 2 */HAL_TIM_PWM_Start(htim3, TIM_CHANNEL_1); //开启PWM输出通道:PA6
// TIM3-ARR 1000-1;//自动重装载值TIM3-CCR1 300;//捕获/比较计数值PWM占空比5000/100050% f1MHz/10001KHzTIM2-PSC 36 - 1; //预分频f2MHzHAL_TIM_IC_Start(htim2, TIM_CHANNEL_1); //开启输入捕获上升沿PA0HAL_TIM_IC_Start(htim2, TIM_CHANNEL_2); //开启输入捕获下降沿:PA0/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while(1){/* USER CODE END WHILE *//* USER CODE BEGIN 3 */HAL_Delay(1000);ARR TIM2-CCR1 1; //捕获上升沿开始计数计数值Duty_High TIM2-CCR2 1; //捕获下降沿计数值//f f/psc1000 000//计一个数的时间T1/f//PWM_f ARR/fPWM_f 2000/ARR;//KHz, 1/ARR*(T) 1/ARR*(1/f) f/ARRDuty Duty_High * 100 / ARR;sprintf((char*)USART_TX_Buff, PWM_f:%dKHz,ARR:%d,Duty_High:%d,Duty:%d%%, PWM_f, ARR, Duty_High, Duty); //打印输入捕获总计数值高电平计数值printf(%s \n, USART_TX_Buff);memset((char*)USART_TX_Buff, \0, strlen((char*)USART_TX_Buff)); //清空数组}/* USER CODE END 3 */
}/*** brief System Clock Configuration* retval None*/
void SystemClock_Config(void)
{RCC_OscInitTypeDef RCC_OscInitStruct {0};RCC_ClkInitTypeDef RCC_ClkInitStruct {0};/** 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.HSEPredivValue RCC_HSE_PREDIV_DIV1;RCC_OscInitStruct.HSIState RCC_HSI_ON;RCC_OscInitStruct.PLL.PLLState RCC_PLL_ON;RCC_OscInitStruct.PLL.PLLSource RCC_PLLSOURCE_HSE;RCC_OscInitStruct.PLL.PLLMUL RCC_PLL_MUL9;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_DIV2;RCC_ClkInitStruct.APB2CLKDivider RCC_HCLK_DIV1;if(HAL_RCC_ClockConfig(RCC_ClkInitStruct, FLASH_LATENCY_2) ! HAL_OK){Error_Handler();}
}/* USER CODE BEGIN 4 *//* 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 */
串口打印
工程源码
链接https://pan.baidu.com/s/1OJ6JuZt-76A-AjvvB2H3cA
提取码p4hf
