单片机矩阵数码管显示固定数值和对应键值

ID:351822 · 发表于 2018-9-21 15:17

#include<AT89X52.H>    //包含AT89X52.H头文件    /*定义0~9，A~F十六个字符的字型码表*/
unsigned char table[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,
   0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71};

void delay10ms(void)
{
unsigned char i,j;
for(i=20;i>0;i--)
for(j=248;j>0;j--);
}

void delay()
{
unsigned char i;
for(i=0;i<255;i++);
}

unsigned char scan_key(void)
{
unsigned char scan,col,rol,tmp;
bit flag=0;
scan=0xef;
for(col=0;col<4;col++)
{
P0=scan;
tmp=P0;
switch(tmp&0x0f)
{
case 0x0e:rol=0;flag=1;break;
case 0x0d:rol=1;flag=1;break;
case 0x0b:rol=2;flag=1;break;
case 0x07:rol=3;flag=1;break;
}
if(flag==1)
break;
scan=(scan<<1)+1;
}
while(tmp!=0x0f)
{
P0=0x0f;
tmp=P0;
}
return(rol*4+col);
}

void scan()
{
unsigned char tmp,key;
while(tmp!=0x0f)
{

P1=table[0];
P2=0xfe;
delay();
P2=0xff;
P1=table[6];
P2=0xfd;
delay();
P2=0xff;

}
}

void main()
{
unsigned char tmp,key;
P0=0x0f;
while(1)
{
while(tmp==0x0f)
{
P0=0x0f;
tmp=P0;
}
delay10ms();
P0=0x0f;
tmp=P0;
if(tmp==0x0f)
continue;
key=scan_key();
P1=table[key];
P2=0xf7;
delay();
scan();
}

}

ID:1 · 发表于 2018-9-21 17:25

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