矩阵键盘单个数码管显示C语言程序

#include

#define uchar unsigned char

#define uint unsigned int

uchar code_h,code_l; //定义行扫描码，列检测数据uchar tmp,keyvalue; //定义接收键值

/*函数说明*/

void delay(void);

uchar keyscan();

/*主函数*/

void main () //键值处理

{

while(1)

{

tmp=keyscan();//调用键盘扫描程序

switch(tmp)

{ case 0x11: P0=0x3f; break; //0

case 0x12: P0=0x06; break; //1

case 0x14: P0=0x5b; break; //2

case 0x18: P0=0x4f; break; //3

case 0x21: P0=0x66; break; //4

case 0x22: P0=0x6d; break; //5

case 0x24: P0=0x7d; break; //6

case 0x28: P0=0x07; break; //7

case 0x41: P0=0x7f; break; //8

case 0x42: P0=0x67; break; //9

case 0x44: P0=0x77; break; //a

case 0x48: P0=0x7c; break; //b

case 0x81: P0=0x39; break; //c

case 0x82: P0=0x5c; break; //d

case 0x84: P0=0x79; break; //e

case 0x88: P0=0x71; break; //f

case 0x00: ; break;

default:P0=0x00;

}

delay();

}

}

/*延时函数*/

void delay(void)

{uchar i;

for(i=0;i<200;i++){}

}

/*键盘扫描函数*/

uchar keyscan(void)

{uchar code_h; //行扫描

uchar code_l; //列扫描

P1=0XF0; //P1.0~P1.3置0，准备读列状态

if((P1&0XF0)!=0XF0) //如果P1.4~P1.7不全为1，可能有键按下

{delay(); //延时消抖动

if((P1&0XF0)!=0XF0) //重读高4位，若还是不全为1，定有键按下

{code_h=0XFE; //P1.0置为0，开始行扫描

while ((code_h&0X10)!=0XF0) //判断是否为最后一行，否则继续扫描{P1=code_h; //P1口输出行扫描值

if((P1&0XF0)!=0XF0) //如果P1.4~P1.7不全为1，该行有按键按下

{code_l=(P1&0XF0|0X0F); //保留P1口高4位，低4位变为1，作为列值

keyvalue=(~code_h)+(~code_l); //键编码=行扫描值+列扫描值，返回主程序return (keyvalue) ;

while((P1&0XF0)!=0XF0); //等待按键释放

}

else //该行没按键按下，左移，扫描下一行code_h=(code_h<<1)|0X01;

}

}

}

return(0x00); //无按键按下，返回0

}