藍橋杯嵌入式—基礎模塊：PWM輸出與輸入捕獲（兩種方式）

原創 fancyZT 2020-07-01 03:55

一、模塊相關
PWM輸出、輸入捕獲（兩種方式實現）

二、實現功能
PA1——PA6
PA2——PA7
PA1、PA2產生PWM，分別用PA6、PA7來捕獲。

三、PA1——PA6
1.初始化函數
tx.c

void Tim2_Init(u32 fre,u8 duty){//產生PWM
  u32 arr;
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
  
  arr=1000000/fre;

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;	 
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  TIM_TimeBaseStructure.TIM_Period = arr-1;
  TIM_TimeBaseStructure.TIM_Prescaler = 71;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = (arr-1)*duty/100;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

  TIM_OC2Init(TIM2, &TIM_OCInitStructure);

  TIM_ITConfig(TIM2, TIM_IT_CC2, ENABLE);

  /* TIM2 enable counter */
  TIM_Cmd(TIM2, ENABLE);
}

//捕獲
void Tim3_Init(void){
  TIM_ICInitTypeDef  TIM_ICInitStructure;
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  GPIO_InitTypeDef GPIO_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  TIM_TimeBaseStructure.TIM_Period = 0xffff;
  TIM_TimeBaseStructure.TIM_Prescaler = 71;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

  TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
  TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
  TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
  TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
  TIM_ICInitStructure.TIM_ICFilter = 0x0;

  TIM_ICInit(TIM3, &TIM_ICInitStructure);
  TIM_Cmd(TIM3, ENABLE);

  /* Enable the CC2 Interrupt Request */
  TIM_ITConfig(TIM3, TIM_IT_CC1, ENABLE);
}

2.中斷
stm32f10x_it.h

__IO uint16_t IC3ReadValue1 = 0, IC3ReadValue2 = 0;
__IO uint16_t CaptureNumber = 0;
__IO uint32_t Capture = 0;
__IO uint32_t TIM3Freq = 0;
void TIM3_IRQHandler(void)
{ 
  if(TIM_GetITStatus(TIM3, TIM_IT_CC1) == SET) 
  {
    /* Clear TIM3 Capture compare interrupt pending bit */
    TIM_ClearITPendingBit(TIM3, TIM_IT_CC1);
    if(CaptureNumber == 0)
    {
      /* Get the Input Capture value */
      IC3ReadValue1 = TIM_GetCapture1(TIM3);
      CaptureNumber = 1;
    }
    else if(CaptureNumber == 1)
    {
      /* Get the Input Capture value */
      IC3ReadValue2 = TIM_GetCapture1(TIM3); 
      
      /* Capture computation */
      if (IC3ReadValue2 > IC3ReadValue1)
      {
        Capture = (IC3ReadValue2 - IC3ReadValue1); 
      }
      else
      {
        Capture = ((0xFFFF - IC3ReadValue1) + IC3ReadValue2); 
      }
      /* Frequency computation */ 
      TIM3Freq = 1000000 / Capture;
      CaptureNumber = 0;
    }
  }
}

3.主函數
main.c

#include "stm32f10x.h"
#include "lcd.h"
#include "tx.h"
#include "stdio.h"
#include "i2c.h"

u32 TimingDelay = 0;
u8 str[20];

void Delay_Ms(u32 nTime);
extern __IO uint32_t TIM3Freq;

//Main Body
int main(void)
{
	SysTick_Config(SystemCoreClock/1000);

	Delay_Ms(200);
	
	STM3210B_LCD_Init();
	LCD_Clear(Blue);
	LCD_SetBackColor(Blue);
	LCD_SetTextColor(White);
	
	Tim2_Init(500,10);//產生週期爲500Hz，佔空比爲10%的方波
	Tim3_Init();

	while(1){
	   sprintf((char*)str,"  Fre1 = %dHz      ",TIM3Freq);
	   LCD_DisplayStringLine(Line2,str);
	}
}


void Delay_Ms(u32 nTime)
{
	TimingDelay = nTime;
	while(TimingDelay != 0);	
}

4.PWM波形
在這裏插入圖片描述基本上符合所設置的（500Hz，10%），直接修改參數就能得到其他的波形。

四、PA2——PA7
1.初始化函數
tx.c

void Tim3_Init(void){
  TIM_ICInitTypeDef  TIM_ICInitStructure;
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  GPIO_InitTypeDef GPIO_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  TIM_TimeBaseStructure.TIM_Period = 0xffff;
  TIM_TimeBaseStructure.TIM_Prescaler = 71;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

  TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
  TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
  TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
  TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
  TIM_ICInitStructure.TIM_ICFilter = 0x0;

  TIM_ICInit(TIM3, &TIM_ICInitStructure);
  TIM_Cmd(TIM3, ENABLE);

  /* Enable the CC2 Interrupt Request */
  TIM_ITConfig(TIM3, TIM_IT_CC1, ENABLE);
}

u32 CH2_val;
u32 CH2_duty;
void PWM_out(u32 fre,u8 duty){
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
  
  CH2_val=1000000/fre;
  CH2_duty=CH2_val*duty/100;

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;	 
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  TIM_TimeBaseStructure.TIM_Period = 0xffff;
  TIM_TimeBaseStructure.TIM_Prescaler = 71;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CH2_val;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;

  TIM_OC3Init(TIM2, &TIM_OCInitStructure);

  TIM_ITConfig(TIM2, TIM_IT_CC3, ENABLE);

  /* TIM2 enable counter */
  TIM_Cmd(TIM2, ENABLE);	 
}

void PWM_in(void){
  TIM_ICInitTypeDef  TIM_ICInitStructure;
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  GPIO_InitTypeDef GPIO_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  TIM_TimeBaseStructure.TIM_Period = 0xffff;
  TIM_TimeBaseStructure.TIM_Prescaler = 71;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

  TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
  TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
  TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
  TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
  TIM_ICInitStructure.TIM_ICFilter = 0x0;

  TIM_ICInit(TIM3, &TIM_ICInitStructure);
  TIM_Cmd(TIM3, ENABLE);

  /* Enable the CC2 Interrupt Request */
  TIM_ITConfig(TIM3, TIM_IT_CC2, ENABLE);


}

2.中斷函數
stm32f10x_it.h

extern u32 CH2_val;
extern u32 CH2_duty;

void TIM2_IRQHandler(void)
{
  u16 capture;
  static u8 flag=0;
  if (TIM_GetITStatus(TIM2, TIM_IT_CC3) != RESET)
  {
    TIM_ClearITPendingBit(TIM2, TIM_IT_CC3);
    capture = TIM_GetCapture3(TIM2);
	if(flag)
      TIM_SetCompare3(TIM2, capture + CH2_duty);
	else
	  TIM_SetCompare3(TIM2, capture + CH2_val - CH2_duty);
	flag^=1;
  }
}

u8   CAPTURE_MODE=0;
u16  CAPTURE_H;
u16  CAPTURE_HL;

void TIM3_IRQHandler(void)
{ 
  
  if(TIM_GetITStatus(TIM3, TIM_IT_CC2) == SET) 
  {
    /* Clear TIM3 Capture compare interrupt pending bit */
    TIM_ClearITPendingBit(TIM3, TIM_IT_CC2);
	switch(CAPTURE_MODE){
	   case 0:
	     CAPTURE_MODE=1;
		 CAPTURE_H=0;
		 CAPTURE_HL=0;
		 TIM_SetCounter(TIM3,0);
		 TIM_OC2PolarityConfig(TIM3,TIM_ICPolarity_Falling);
		 break;
	   case 1:
	     CAPTURE_MODE=2;
		 CAPTURE_H=TIM_GetCounter(TIM3);
		 TIM_OC2PolarityConfig(TIM3,TIM_ICPolarity_Rising);
		 break;
	   case 2:
	     CAPTURE_MODE=3;
		 CAPTURE_HL=TIM_GetCounter(TIM3);
		 break;
	}
  }
}

3.主函數
main.c

#include "stm32f10x.h"
#include "lcd.h"
#include "tx.h"
#include "stdio.h"

u32 TimingDelay = 0;
u8 str[20];

extern u8   CAPTURE_MODE;
extern u16  CAPTURE_H;
extern u16  CAPTURE_HL;

void Delay_Ms(u32 nTime);

extern __IO uint32_t TIM3Freq;

//Main Body
int main(void)
{
	SysTick_Config(SystemCoreClock/1000);

	Delay_Ms(200);
	
	STM3210B_LCD_Init();
	LCD_Clear(Blue);
	LCD_SetBackColor(Blue);
	LCD_SetTextColor(White);
	
	PWM_out(500,20);
	PWM_in();

	while(1){
	   sprintf((char*)str,"  Fre = %dHz      ",1000000/CAPTURE_HL);
	   LCD_DisplayStringLine(Line2,str);

	   sprintf((char*)str,"  Duty = %d%%      ",CAPTURE_H*100/CAPTURE_HL);
	   LCD_DisplayStringLine(Line4,str);
	}
}

void Delay_Ms(u32 nTime)
{
	TimingDelay = nTime;
	while(TimingDelay != 0);	
}

4.PWM波形
在這裏插入圖片描述基本上符合所設置的（500Hz，20%）。

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