文件目录

main.c

#include <REGX52.H>
#include "TIMER0.H"
#include "KEY.H"
#include "DELAY.H"


//void Timer0_Init() {
//	TMOD = 0x01;
//	TL0 = 64536 % 256;
//	TH0 = 64536	/ 256;
//	ET0 = 1;
//	EA = 1;
//	TR0 = 1;
//}

unsigned char keyNum = 0;                           //链接文件会拼到一起，不要起一样的名字

void main() {
//	Timer0_Init();
		while(1) {
			keyNum = Key();
			if(keyNum) {                                 //if来缓解闪动
				if(keyNum == 1) P2_1 = ~P2_1;
				if(keyNum == 2) P2_2 = ~P2_2;
				if(keyNum == 3) P2_3 = ~P2_3;
				if(keyNum == 4) P2_4 = ~P2_4;
			}
		}
}


//static unsigned int T0Count = 0;
//void Timer0_Routine() interrupt 1{
//	TL0 = 64536 % 256;
//	TH0 = 64536 / 256;
//	T0Count ++;
//	if(T0Count >= 1000) {
//		T0Count = 0;
//		P2_0 = ~P2_0;
//	}
//}

Key.c

unsigned char Key() {
	
	unsigned char keyNumber = 0;         //不要放在外面，每次没按动的时候默认if全部经过就是 keyNumber                        
	
	if(P3_1 == 0){Delay(20);while(P3_1 == 0);Delay(20);keyNumber = 1;}
	if(P3_0 == 0){Delay(20);while(P3_0 == 0);Delay(20);keyNumber = 2;}
	if(P3_2 == 0){Delay(20);while(P3_2 == 0);Delay(20);keyNumber = 3;}
	if(P3_3 == 0){Delay(20);while(P3_3 == 0);Delay(20);keyNumber = 4;}
	
	return keyNumber;
	
}

Key.h

#ifndef __KEY_H__
#define	__KEY_H__
	unsigned char Key();             //要有返回类型，要有“;”结尾
#endif

---

下面是对的

Timer0.c

#include <REGX52.H>


void Timer0_Init() {
	TMOD = 0x01;
	TL0 = 64536 % 256;
	TH0 = 64536	/ 256;
	ET0 = 1;
	EA = 1;
	TR0 = 1;
}

Timer0.h

#ifndef __TIMER0_H__
#define	__TIMER0_H__

void Timer0_Init(void);
	
#endif

Delay.c

void Delay(unsigned int xms)
{
	unsigned char i, j;
	while(xms--)
	{
		i = 2;
		j = 239;
		do
		{
			while (--j);
		} while (--i);
	}
}

Delay.h

#ifndef __DELAY_H__
#define __DELAY_H__

void Delay(unsigned int xms);

#endif