单片机实验（定时器产生方波）

2019-04-15 19:28发布生成海报

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普通IO口输出方波

/*
* Copyrite (c) 2018, 单片机与嵌入式系统工作室
* All Rights Reserved
*
* File Name ：main.cpp
* File Description :T2定时器 实现普通IO口输出方波
*                   P3.6  200Hz
*		    P3.7  100Hz   晶振频率12MHz
*
* Current Version: 1.0
* Author : 徐子航
* Finish Time : 2018.04.24
*
* Earlier Version ：
* Author ：
* Finish Time 
*/

#include 

#define uchar unsigned char
#define uint  unsigned int

sbit PWM_200 = P3^6;
sbit PWM_100 = P3^7;

uint TIME_Flag = 0;

void TIME_Configuration()
{
      TMOD =0x02;
	  TL0 = 6; 		 
	  TH0 = 6;
	  ET0 = 1;
	  EA = 1 ;
	  TR0 = 1;
}

void TIME_Handler() interrupt 1 
{
     TIME_Flag++;

	 if(TIME_Flag % 10 == 0)
	 {
     	 PWM_200= ~PWM_200;
	 }
	 if(TIME_Flag == 20)
	 {
	     PWM_100 = ~PWM_100;
	     TIME_Flag = 0;
	 }
}

int main()
{
   TIME_Configuration();

   while(1)
   {
   }
}

按键控制产生不同的频率
button.h

#ifndef BUTTON_H
#define BUTTON_H

#define uchar unsigned char
#define uint  unsigned int

sbit KEY_05_hz =  P1^0;
sbit KEY_1_hz =  P1^1;
sbit KEY_2_hz =  P1^2;
sbit KEY_4_hz =  P1^3;

extern uint PWM_Flag;

void KeyScan();
void Delay_Ms(uint n);


#endif

button.c

#include "reg52.h"
#include "button.h"

void KeyScan()
{

     if(KEY_05_hz == 0)
	 {
	     Delay_Ms(10);
		 if(KEY_05_hz == 0)
		 {
		    PWM_Flag = 8;  
		 }
		 while(!KEY_05_hz); 
	 }

	 if(KEY_1_hz == 0)
	 {
	     Delay_Ms(10);
	     if(KEY_1_hz == 0)
		 {
		      PWM_Flag = 4;   
		 }
	 	while(!KEY_1_hz);
	 }

	  if(KEY_2_hz == 0)
	 {
	     Delay_Ms(10);
	     if(KEY_2_hz == 0)
		 {
		      PWM_Flag = 2;  
		 }
	 	while(!KEY_2_hz);
	 }

	 if(KEY_4_hz == 0)
	 {
	     Delay_Ms(10);
	     if(KEY_4_hz == 0)
		 {
		      PWM_Flag = 1;  
		 }
	 	while(!KEY_4_hz);
	 }
}

main.c

/*
* Copyrite (c) 2018, 单片机与嵌入式系统工作室
* All Rights Reserved
*
* File Name ：main.cpp
* File Description :T2定时器产生方波 按键控制产生不同的频率
*                   P1.0   0.5kHz  P1.1  1kHz 
*					P1.2   2K      P1.3  4kHz
*
* Current Version: 1.1
* Author : 徐子航
* Finish Time : 2018.04.24
*
* Earlier Version ：
* Author ：
* Finish Time 
*/

#include 
#include "button.h"

#define uchar unsigned char
#define uint  unsigned int

sbit PWM = P1^7;

uint PWM_Flag = 8;	     //默认输出0.5khz方波
uint TIME_Flag = 0;   

void Delay_Ms(uint n)
{	
    int i = 0;

    for(;n>0;n--)
	{
	   for(i = 110; i > 0; i++)
	   {}
	
	}
}

void TIME_Configuration()
{
      TMOD =0x02;
	  TL0 = 131;    //125us		 
	  TH0 = 131;
	  ET0 = 1;
	  EA = 1 ;
	  TR0 = 1;
}


void TIME_Handler() interrupt 1 
{
     TIME_Flag++;

	 if(TIME_Flag == PWM_Flag)
	 {
     	 PWM= ~PWM;
		 TIME_Flag = 0;
	 }
}


int main()
{
   TIME_Configuration();

   while(1)
   {
      KeyScan(); 
   }

}

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单片机实验（定时器产生方波）
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