[分享]4x4键盘扫描程序[avr论坛].mht

4*4键盘扫描程序

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onload=3D"this.style.overflowX=3D'auto';"><PRE>/*<BR>=B0=B4=BC=FC=BB=F1=C8=
=A1=BA=AF=CA=FD<BR>&nbsp;=BB=F1=C8=A1=B0=B4=BC=FC=D0=C5=BA=C5=A3=AC=C6=E4=
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=FC=B6=B6=A1=A3<BR>&nbsp;=D3=D0=D5=FD=C8=B7=B0=B4=BC=FC=B0=B4=CF=C2=B7=B5=
=BB=D8=CF=E0=D3=A6=B0=B4=BC=FC=D6=B5<BR>&nbsp;=CE=DE=D5=FD=C8=B7=B0=B4=BC=
=FC=B0=B4=CF=C2=B7=B5=BB=D8"0x00"<BR>*/<BR>unsigned char =
get_key(void){<BR>&nbsp;unsigned char i;<BR>&nbsp;static unsigned char =
j;/*=B0=B4=BC=FC=BC=C7=C2=BC*/</PRE><PRE>&nbsp;i =3D =
key_read();<BR>&nbsp;if (i =3D=3D =
0x00){/*=CE=DE=D3=D0=D0=A7=B0=B4=BC=FC=B0=B4=CF=C2*/<BR>&nbsp;&nbsp;j =
=3D 0x00;/*=C7=E5=B3=FD=B0=B4=BC=FC=BC=C7=C2=BC*/<BR>&nbsp;&nbsp;return =
0x00;/*=B3=CC=D0=F2=CD=CB=B3=F6*/<BR>&nbsp;&nbsp;}<BR>&nbsp;if (j =3D=3D =
0x00) {/*=CE=AA=D0=C2=B0=B4=BC=FC*/<BR>&nbsp;&nbsp;j =3D =
i;/*=B1=A3=B4=E6=B1=BE=B4=CE=B2=C9=D1=F9=BD=E1=B9=FB*/<BR>&nbsp;&nbsp;del=
ay_ms(10);/*=C8=A5=B0=B4=BC=FC=B2=FC=B6=B6*/<BR>&nbsp;&nbsp;i =3D =
key_read();<BR>&nbsp;&nbsp;if(i =3D=3D j) {<BR>&nbsp;&nbsp;&nbsp;return =
i;<BR>&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;}<BR>&nbsp;return =
0x00;<BR>}</PRE></DIV></DIV></DIV>
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