蓝桥杯嵌入式赛道复习笔记5(捕获信号发生器的PWM的波形)

原理框图

代码

cubeMX配置

TIM2,TIM3

 代码展示

main(while)

HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2, GPIO_PIN_RESET);
	char buff[20];
	char buff1[20];
	char buff2[20];
  extern TIM_HandleTypeDef htim2;
  extern TIM_HandleTypeDef htim3;
	extern uint32_t fre1;
  extern uint32_t fre2;
	LCD_Init();
	LCD_Clear(Black);
	LCD_SetBackColor(Black);
	LCD_SetTextColor(White);
	HAL_TIM_IC_Start_IT(&htim2,TIM_CHANNEL_1);
	HAL_TIM_IC_Start_IT(&htim3,TIM_CHANNEL_1);
  while (1)
	{
		  sprintf(buff,"        fre        ");
		  LCD_DisplayStringLine(Line1,(uint8_t *)buff);
		  sprintf(buff1,"  fre1_R40=%d",fre1);
		  LCD_DisplayStringLine(Line2,(uint8_t *)buff1);
		  sprintf(buff2,"  fre2_R39=%d",fre2);
		  LCD_DisplayStringLine(Line3,(uint8_t *)buff2);
		
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

中断函数

uint32_t fre1,capture1;
uint32_t fre2,capture2;
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim){
	if(htim->Instance==TIM2){
		capture1=TIM2->CCR1;
		TIM2->CNT=0;
		fre1=80000000/800/capture1;
	}
	if(htim->Instance==TIM3){
		capture2=TIM3->CCR1;
		TIM3->CNT=0;
		fre2=80000000/800/capture2;
	}
}