单片机故障排除篇--如何判定是硬件问题还是软件问题？

Posted 2021-12-28 zhangrelay

 

一段代码写完了，编译下载都ok。

但是没有看到想要的结果？怎么排错？？？

借一个别人正常的板子是一种方法，但是镜像提供了全仿真工具，试一下吧。

新建项目：

 添加time.c到工程中！

 添加复用数码管。

 

当然程序要做微微调整。

 

单片机课堂思考题-2000秒倒计时？

参考上例程序：

先分配管脚和端口

#include<8052.h>                         
       
unsigned char smgduan[]=0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0x0f8,0x80,0x90;
unsigned char T0RH = 0; 
unsigned char T0RL = 0; 
unsigned int cnt;
int sec;
int sec_all=6666;
int count=0;
void LedScan(unsigned char pos,unsigned char dispcode);
void EXINT0() __interrupt 0;
void Timer0() __interrupt 1;
void EXINT1() __interrupt 2;
void ConfigTimer0(unsigned int);
void main()

	cnt = 0;            
	sec = sec_all;      
	ConfigTimer0(2); 
	IT0=1; 
	EX0=1;
	IT1=1; 
	EX1=1;
	PX1=1;	  				
        TR0=1;          
	while(1)
	
		LedScan(0,smgduan[sec%10]);    
		LedScan(1,smgduan[sec/10%10]);  
		LedScan(2,smgduan[sec/100%10]); 
		LedScan(3,smgduan[sec/1000]);   
		if(count%2==0)
		
		  TR0 = 1;
		
		else
		
	          TR0 = 0;
			
	


void EXINT0() __interrupt 0     	

	count++;				

void EXINT1() __interrupt 2

	sec_all=0;


void ConfigTimer0(unsigned int ms)

	unsigned long tmp; 	     
	tmp = 11059200 / 12; 	 
	tmp = (tmp * ms) / 1000; 
	tmp = 65536 - tmp; 	     
	tmp = tmp + 18; 	     
	T0RH = (unsigned char)(tmp>>8); 	
	T0RL = (unsigned char)tmp;
	TMOD &= 0xF0; 		
	TMOD |= 0x01; 		
	TH0 = T0RH; 		
	TL0 = T0RL;
	ET0 = 1; 		   


void Timer0() __interrupt 1

	TH0 = T0RH; 	
	TL0 = T0RL;
	cnt++; 		
	if (cnt >= 5)
	
		cnt = 0;
		sec--;   
		if (sec < 0)   
		
			sec = sec_all; 
		
	


void LedScan(unsigned char pos,unsigned char dispcode)

 unsigned char i;
 for(i=0;i<=pos;i++)
 		
	switch(pos)	 	
		case(0):
		P1_0=0;P1_1=1;P1_2=1;P1_3=1; break;
		case(1):
		P1_0=1;P1_1=0;P1_2=1;P1_3=1; break;
		case(2):
		P1_0=1;P1_1=1;P1_2=0;P1_3=1; break;
		case(3):
		P1_0=1;P1_1=1;P1_2=1;P1_3=0; break;
	
	P0=dispcode;	
 	

 

#include<8052.h>                         
       
unsigned char smgduan[]=0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0x0f8,0x80,0x90;
unsigned char T0RH = 0; 
unsigned char T0RL = 0; 
unsigned int cnt;
int sec;
int sec_all=6666;
int count=0;
void LedScan(unsigned char pos,unsigned char dispcode);
void EXINT0() __interrupt 0;
void Timer0() __interrupt 1;
void EXINT1() __interrupt 2;
void ConfigTimer0(unsigned int);
void main()

	cnt = 0;            
	sec = sec_all;      
	ConfigTimer0(1); 
	IT0=1; 
	EX0=1;
	IT1=1; 
	EX1=1;
	PX1=1;	  				
        TR0=1;          
	while(1)
	
		LedScan(0,smgduan[sec%10]);    
		LedScan(1,smgduan[sec/10%10]);  
		LedScan(2,smgduan[sec/100%10]); 
		LedScan(3,smgduan[sec/1000]);   
		if(count%2==0)
		
		  TR0 = 1;
		
		else
		
	          TR0 = 0;
			
	


void EXINT0() __interrupt 0     	

	count++;				

void EXINT1() __interrupt 2

	sec_all=0;


void ConfigTimer0(unsigned int ms)

	unsigned long tmp; 	     
	tmp = 11059200 / 12; 	 
	tmp = (tmp * ms) / 1000; 
	tmp = 65536 - tmp; 	     
	tmp = tmp + 18; 	     
	T0RH = (unsigned char)(tmp>>8); 	
	T0RL = (unsigned char)tmp;
	TMOD &= 0xF0; 		
	TMOD |= 0x01; 		
	TH0 = T0RH; 		
	TL0 = T0RL;
	ET0 = 1; 		   


void Timer0() __interrupt 1

	TH0 = T0RH; 	
	TL0 = T0RL;
	cnt++; 		
	if (cnt >= 2)
	
		cnt = 0;
		sec--;   
		if (sec < 0)   
		
			sec = sec_all; 
		
	


void LedScan(unsigned char pos,unsigned char dispcode)

 unsigned char i;
 for(i=0;i<=pos;i++)
 		
	switch(pos)	 	
		case(0):
		P1_0=0;P1_1=1;P1_2=1;P1_3=1; break;
		case(1):
		P1_0=1;P1_1=0;P1_2=1;P1_3=1; break;
		case(2):
		P1_0=1;P1_1=1;P1_2=0;P1_3=1; break;
		case(3):
		P1_0=1;P1_1=1;P1_2=1;P1_3=0; break;
	
	P0=dispcode;