51单片机矩阵键盘程序(共2页).doc

/*风清云扬*/# include #define uchar unsigned char#define uint unsigned intvoid delay(uint i)uchar x,j;for(j=0;ji;j+)for(x=0;x=148;x+);unsigned char key_scan() uchar temp0,temp1; uchar num=0; P1=0X0F; temp0=P1; if(temp0!=0X0F) delay(10); if(temp0!=0X0F) P1=0XF0; temp1=P1; if(temp0=0x0e) switch (temp1) case 0xe0: num=4;break; case 0xd0: num=3;break; case 0xb0: num=2;break; c