蓝桥杯（IAP15）数码管显示与状态机扫描矩阵键盘（1）

在12MHZ下

#include <stc15f2k60s2.h>
#include <intrins.h>
#include <stdio.h>
#include <string.h>

#define uchar unsigned char
#define uint unsigned int
#define get() (P3&0x3f)|((P4&0x10)<<3)|((P4&0x04)<<4)

void allinit();
void Delay5ms()	;	//@12.000MHz
void mkey();
void Timer0Init();

uchar tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xbf,0xff};
uchar disbuf[8]={0,11,11,11,11,11,11,11};
uchar discom=0,key=0;


void main()
{
	Timer0Init();
	ET0=1;
	EA=1;
	allinit();
	while(1)
	{
		mkey();
	}
	
}
void mkey()
{
	uchar temp;
	P3=0x0f;P44=0;P42=0;
	temp=get();
	P3=0xf0;P44=1;P42=1;
	temp|=get();//是或取位
	
	if((temp!=0xff)&&!key)
	{
			key=temp;
	}
	else if((temp==0xff)&&key)//注意是else选择，==为松手触发,!=为按下触发//累加的功能用松手触发
	{
			switch (key)
			{
				case 0x7e:disbuf[0]=1;break;
				case 0x7d:disbuf[0]=2;break;
				case 0x7b:disbuf[0]=3;break;
				case 0x77:disbuf[0]=4;break;
				
				case 0xbe:disbuf[0]=5;break;
				case 0xbd:disbuf[0]=6;break;
				case 0xbb:disbuf[0]=7;break;
				case 0xb7:disbuf[0]=8;break;
				
				case 0xde:disbuf[1]=0;break;
				case 0xdd:disbuf[2]=1;break;
				case 0xdb:disbuf[3]=1;break;
				case 0xd7:disbuf[4]=1;break;
				
				case 0xee:disbuf[5]=1;break;
				case 0xed:disbuf[6]=1;break;
				case 0xeb:disbuf[7]=1;break;
				case 0xe7:disbuf[0]=9;break;
			}
			key=0;
	}
}
void Timer0Init(void)		//1ms@12.000MHz
{
	AUXR |= 0x80;		//
	TMOD &= 0xF0;		//
	TL0 = 0x20;		//
	TH0 = 0xD1;		//
	TF0 = 0;		//
	TR0 = 1;		//
}

void time0() interrupt 1
{
	P2=0xc0;
	P0=1<<discom;
	P2=0xe0;
	P0=tab[disbuf[discom]];
	
	if(++discom==8)discom=0;
}

void allinit()//这里写的并不严谨应做处理不影响其他管
{
	P2=0x80;
	P0=0xff;
	
	P2=0xa0;
	P0=0x00;
	
	P2=0xc0;
	P0=0xff;
	P2=0xe0;
	P0=0xff;
}

void Delay5ms()		//@12.000MHz
{
	unsigned char i, j;

	i = 59;
	j = 90;
	do
	{
		while (--j);
	} while (--i);
}