📄 用计算机并口模拟spi通讯的c源程序。.mht
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<BLOCKQUOTE><BR>#include <DOS.H><BR>#include <CONIO.H><BR>#include =
<STDIO.H><BR>#include <STDLIB.H><BR>#include =
<STRING.H><BR><BR>#define=20
LPT_PORT 0x378<BR>#define=20
CLR_WCK(X) {X=3DX&(~(1<<0)); =
outportb(LPT_PORT,X); }=20
// data.0<BR>#define SET_WCK(X) {X=3DX | (1<<0) ;=20
outportb(LPT_PORT,X); }<BR>#define=20
CLR_BCK(X) {X=3DX&(~(1<<2)); =
outportb(LPT_PORT,X);=20
} // data.2<BR>#define SET_BCK(X) {X=3DX | =
(1<<2) ; outportb(LPT_PORT,X); }<BR>#define CLR_DATA(X)=20
{X=3DX&(~(1<<3)); outportb(LPT_PORT,X); =
} //=20
data.3<BR>#define SET_DATA(X) {X=3DX | (1<<3) ;=20
outportb(LPT_PORT,X); }<BR>#define FALSE 0<BR>#define=20
TRUE 1<BR>void test_comm()<BR>{<BR>unsigned char data =
;<BR>data =3D 0;<BR>printf("Please press enter to begin send=20
data\n");<BR>getch();<BR>printf("Pull down WCK=20
data.0\n");<BR>CLR_WCK(data);<BR>getch();<BR>printf("Pull up WCK =
data.0\n");<BR>SET_WCK(data);<BR>getch();<BR><BR>printf("Pull =
down BCK=20
data.2\n");<BR>CLR_BCK(data);<BR>getch();<BR>printf("Pull up BCK =
data.2\n");<BR>SET_BCK(data);<BR>getch();<BR><BR>printf("Pull =
down DATA=20
data.3\n");<BR>CLR_DATA(data);<BR>getch();<BR>printf("Pull up =
DATA=20
data.3\n");<BR>SET_DATA(data);<BR>getch();<BR>}<BR>// Note: the =
size of=20
buffer to send must be dword multiple<BR>// size is the number =
of bytes=20
to send<BR>void short_delay(int n)<BR>{<BR>int=20
i;<BR>for(i=3D0;i<N*1000;I++)<BR> {int temp =3D0;}<BR>}<BR>int=20
send_spi_data(unsigned char *buffer, unsigned long=20
size)<BR>{<BR>unsigned char buff[1024];<BR>unsigned char=20
*buf=3Dbuff;<BR>unsigned char data;<BR>int i,j,k;<BR>data=20
=3D0;<BR>if((size%4)!=3D0) return=20
=
FALSE;<BR>memcpy(buff,buffer,size);<BR><BR>do{<BR>SET_WCK(data);<BR>for(k=
=3D0;k<2;k++){<BR>for(j=3D0;j<2;j++){<BR>printf(".");<BR>for(i=3D0;=
i<8;i++){<BR>if((*buf)&0x80){<BR>SET_DATA(data);<BR>}else{<BR>CLR_=
DATA(data);<BR>}<BR>short_delay(1);<BR>//=20
delay(1);<BR>SET_BCK(data);<BR>short_delay(1);<BR>//=20
delay(1);<BR>CLR_BCK(data);<BR>short_delay(1);<BR>//=20
=
delay(1);<BR>*buf<<=3D1;<BR>}<BR>buf++;<BR>size--;<BR>}<BR>//=20
buf++;<BR>//=20
=
size--;<BR>CLR_WCK(data);<BR>}<BR>SET_WCK(data);<BR>}while(size>0);<BR=
>return=20
TRUE;<BR>}<BR>/*<BR>void main()<BR>{<BR>int i;<BR>unsigned char=20
tmpdata[4];<BR>tmpdata[0] =3D 0x34;<BR>tmpdata[1] =3D =
0x12;<BR>tmpdata[2] =3D=20
0x56;<BR>tmpdata[3] =3D 0x78;<BR>//=20
=
for(i=3D0;i<500;i++)<BR>for(i=3D0;i<50;i++)<BR>{<BR>send_spi_data(t=
mpdata,4);<BR>}<BR><BR>//=20
=
test_comm();<BR>}<BR>*/<BR><BR><BR><BR><BR><BR></BLOCKQUOTE></TD></TR>
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