测量两路PWM和占空比
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 Configuration
PA15 ------> 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 Configuration
PB4 ------> 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2
HAL_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3
HAL_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=1000000
LCD_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