测量PWM频率和占空比的时序图与步骤

时序图

测量PWM频率和占空比的步骤:

1.PWM信号由TI1进入,配置T11FP1为触发信号，上升沿捕获。
2当上升沿的时候Ic1和ic2同时捕获，计数器CNT清零。
3.到了下降沿的时候，IC2捕获，此时计数器CNT的值被锁存到捕获寄存器CCR2中。
4.到了下一个上升沿的时候，lC1捕获，计数器CNT的值被锁存到捕获寄存器CCR1中。
5.其中CCR2测量的是脉宽，CCR1测量的是周期。
占空比=脉宽/周期

PWM输入模式内部原理图

两个ICx信号被映射至同一个Tlx输入。
这2个ICx信号为边沿有效，但是极性相反。一个上升沿，一个下降沿

CubeMX的基础配置

在测量PWM输出频率CubeMX配置的基础之上对测量占空比中所需要的设置进行配置
参考上一篇文章蓝桥杯STM32G431——测量PWM输出频率

相较于频率的测量，实际上只增加了一个通道二并且配置为非直接输入捕获模式和

下降沿触发

对定时器3的配置如图所示和定时器2相同完成配置即可

测量PWM频率和占空比的编程

pwm_tim.c文件

对测量PWM初始化函数的定时器2和定时器3进行了修改

#include "pwm_tim.h"TIM_HandleTypeDef htim3;
TIM_HandleTypeDef htim2;void PWM_TIM2_Init(void)
{/* USER CODE BEGIN TIM2_Init 0 *//* USER CODE END TIM2_Init 0 */TIM_ClockConfigTypeDef sClockSourceConfig = {0};TIM_SlaveConfigTypeDef sSlaveConfig = {0};TIM_MasterConfigTypeDef sMasterConfig = {0};TIM_IC_InitTypeDef sConfigIC = {0};/* USER CODE BEGIN TIM2_Init 1 *//* USER CODE END TIM2_Init 1 */htim2.Instance = TIM2;htim2.Init.Prescaler = 79;htim2.Init.CounterMode = TIM_COUNTERMODE_UP;htim2.Init.Period = 65535;htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;if (HAL_TIM_Base_Init(&htim2) != HAL_OK){Error_Handler();}sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK){Error_Handler();}if (HAL_TIM_IC_Init(&htim2) != HAL_OK){Error_Handler();}sSlaveConfig.SlaveMode = TIM_SLAVEMODE_RESET;sSlaveConfig.InputTrigger = TIM_TS_TI1FP1;sSlaveConfig.TriggerPolarity = TIM_INPUTCHANNELPOLARITY_RISING;sSlaveConfig.TriggerFilter = 0;if (HAL_TIM_SlaveConfigSynchro(&htim2, &sSlaveConfig) != HAL_OK){Error_Handler();}sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK){Error_Handler();}sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_RISING;sConfigIC.ICSelection = TIM_ICSELECTION_DIRECTTI;sConfigIC.ICPrescaler = TIM_ICPSC_DIV1;sConfigIC.ICFilter = 0;if (HAL_TIM_IC_ConfigChannel(&htim2, &sConfigIC, TIM_CHANNEL_1) != HAL_OK){Error_Handler();}sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_FALLING;sConfigIC.ICSelection = TIM_ICSELECTION_INDIRECTTI;if (HAL_TIM_IC_ConfigChannel(&htim2, &sConfigIC, TIM_CHANNEL_2) != HAL_OK){Error_Handler();}/* USER CODE BEGIN TIM2_Init 2 *//* USER CODE END TIM2_Init 2 */}/* TIM3 init function */
void PWM_TIM3_Init(void)
{/* USER CODE BEGIN TIM3_Init 0 *//* USER CODE END TIM3_Init 0 */TIM_ClockConfigTypeDef sClockSourceConfig = {0};TIM_SlaveConfigTypeDef sSlaveConfig = {0};TIM_MasterConfigTypeDef sMasterConfig = {0};TIM_IC_InitTypeDef sConfigIC = {0};/* USER CODE BEGIN TIM3_Init 1 *//* USER CODE END TIM3_Init 1 */htim3.Instance = TIM3;htim3.Init.Prescaler = 79;htim3.Init.CounterMode = TIM_COUNTERMODE_UP;htim3.Init.Period = 65535;htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;if (HAL_TIM_Base_Init(&htim3) != HAL_OK){Error_Handler();}sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK){Error_Handler();}if (HAL_TIM_IC_Init(&htim3) != HAL_OK){Error_Handler();}sSlaveConfig.SlaveMode = TIM_SLAVEMODE_RESET;sSlaveConfig.InputTrigger = TIM_TS_TI1FP1;sSlaveConfig.TriggerPolarity = TIM_INPUTCHANNELPOLARITY_FALLING;sSlaveConfig.TriggerFilter = 0;if (HAL_TIM_SlaveConfigSynchro(&htim3, &sSlaveConfig) != HAL_OK){Error_Handler();}sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK){Error_Handler();}sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_FALLING;sConfigIC.ICSelection = TIM_ICSELECTION_DIRECTTI;sConfigIC.ICPrescaler = TIM_ICPSC_DIV1;sConfigIC.ICFilter = 0;if (HAL_TIM_IC_ConfigChannel(&htim3, &sConfigIC, TIM_CHANNEL_1) != HAL_OK){Error_Handler();}sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_RISING;sConfigIC.ICSelection = TIM_ICSELECTION_INDIRECTTI;if (HAL_TIM_IC_ConfigChannel(&htim3, &sConfigIC, TIM_CHANNEL_2) != HAL_OK){Error_Handler();}/* USER CODE BEGIN TIM3_Init 2 *//* USER CODE END TIM3_Init 2 */}void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* tim_baseHandle)
{GPIO_InitTypeDef GPIO_InitStruct = {0};if(tim_baseHandle->Instance==TIM2){/* TIM2 clock enable */__HAL_RCC_TIM2_CLK_ENABLE();__HAL_RCC_GPIOA_CLK_ENABLE();/**TIM2 GPIO ConfigurationPA15     ------> TIM2_CH1*/GPIO_InitStruct.Pin = GPIO_PIN_15;GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;GPIO_InitStruct.Pull = GPIO_NOPULL;GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);/* TIM2 interrupt Init */HAL_NVIC_SetPriority(TIM2_IRQn, 3, 0);HAL_NVIC_EnableIRQ(TIM2_IRQn);}else if(tim_baseHandle->Instance==TIM3){/* TIM3 clock enable */__HAL_RCC_TIM3_CLK_ENABLE();__HAL_RCC_GPIOB_CLK_ENABLE();/**TIM3 GPIO ConfigurationPB4     ------> TIM3_CH1*/GPIO_InitStruct.Pin = GPIO_PIN_4;GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;GPIO_InitStruct.Pull = GPIO_NOPULL;GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;GPIO_InitStruct.Alternate = GPIO_AF2_TIM3;HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);/* TIM3 interrupt Init */HAL_NVIC_SetPriority(TIM3_IRQn, 3, 0);HAL_NVIC_EnableIRQ(TIM3_IRQn);}else if(tim_baseHandle->Instance==TIM6){/* TIM6 clock enable */__HAL_RCC_TIM6_CLK_ENABLE();/* TIM6 interrupt Init */HAL_NVIC_SetPriority(TIM6_DAC_IRQn, 2, 0);HAL_NVIC_EnableIRQ(TIM6_DAC_IRQn);}
}

main.c主函数的编写

#include "main.h"
#include "stdio.h"
#include "string.h"
#include "lcd.h"
#include "basic_tim6.h"
#include "pwm_tim.h"
变量
__IO uint32_t uwTick_LCD_State_Pointer;	//LCD减速中使用的
unsigned char Lcd_Disp_String[21];uint8_t i;
//用于pwm回调函数中的变量
uint16_t	pwm1_count_rise;
uint16_t 	pwm1_count_down;
uint16_t	pwm2_count_rise;
uint16_t 	pwm2_count_down;
float duty1; //占空比
float duty2;void SystemClock_Config(void);
void LCD_Proc(void);/*** @brief  The application entry point.* @retval int*/
int main(void)
{HAL_Init();/* Configure the system clock */SystemClock_Config();//**LCD初始化LCD_Init();LCD_Clear(Magenta);LCD_SetBackColor(Magenta);LCD_SetTextColor(Blue);//基础定时器6的初始化BASIC_TIM6_Init();HAL_TIM_Base_Start_IT(&htim6);//PWM初始化PWM_TIM2_Init(); 	//定时器2初始化HAL_TIM_Base_Start_IT(&htim2);	//启动定时器2HAL_TIM_IC_Start_IT(&htim2 , TIM_CHANNEL_1);	//启动定时器2开启通道1输入捕获并开启中断HAL_TIM_IC_Start_IT(&htim2 , TIM_CHANNEL_2);	//启动定时器2开启通道2输入捕获并开启中断PWM_TIM3_Init();	//定时器3初始化HAL_TIM_Base_Start_IT(&htim3);	//启动定时器3HAL_TIM_IC_Start_IT(&htim3 , TIM_CHANNEL_1);	//启动定时器3开启通道1输入捕获并开启中断HAL_TIM_IC_Start_IT(&htim3 , TIM_CHANNEL_2);	//启动定时器3开启通道2输入捕获并开启中断while (1){LCD_Proc();}
}void LCD_Proc(void)
{if(uwTick-uwTick_LCD_State_Pointer<300) return;uwTick_LCD_State_Pointer=uwTick;	memset(Lcd_Disp_String,0,sizeof(Lcd_Disp_String));sprintf((char*)Lcd_Disp_String, "  Timer6_Num : %03d" ,i);LCD_DisplayStringLine(Line4, Lcd_Disp_String);memset(Lcd_Disp_String,0,sizeof(Lcd_Disp_String));sprintf((char*)Lcd_Disp_String, "pwm1:%4dHz,%5.2f%%  ",(unsigned int)1000000/pwm1_count_rise,duty1*100); //频率值为1M/pwm_count 1M=1000000LCD_DisplayStringLine(Line5, Lcd_Disp_String);memset(Lcd_Disp_String,0,sizeof(Lcd_Disp_String));sprintf((char*)Lcd_Disp_String, "pwm2:%4dHz,%5.2f%%  ",(unsigned int)1000000/pwm2_count_rise,duty2*100);LCD_DisplayStringLine(Line6, Lcd_Disp_String);
}//输入捕获中断回调函数
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{if(htim->Instance == TIM2)	//加判断语句用于判别是time2还是time3{if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1)	//通道1上升沿有效{pwm2_count_rise = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1)+1;duty2=(float)pwm2_count_down/pwm2_count_rise;	//在第二次上升沿触发时算出占空比为下降沿触发时的count/上升沿触发时的count}if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_2)	//通道2下降沿有效{pwm2_count_down = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2)+1;}}if(htim->Instance == TIM3)	//对pwm1的处理同上相同{if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1){pwm1_count_rise = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1)+1;duty1=(float)pwm1_count_down/pwm1_count_rise;	}if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_2){pwm1_count_down = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2)+1;}}}//计数更新中断回调函数
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{if(htim->Instance == TIM6){i++;HAL_TIM_Base_Start_IT(&htim6);}
}/*** @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 *//* 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 *//* 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 *//************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

效果图展示为