RS485串口通信

void Send( char *buf, int count)
{
   outportb(0x02FC,inportb(0x02FC)|0x02);    /*Raise the RTS Signal */

    while(count--)PutChar(*buf++);

    while ( ( inportb ( 0x02Fd ) & 0x40 ) == 0 );    /*wait for all data to be sended!*/

   outportb( 0x02FC,inportb(0x02FC)&0xfd);           /*Drop the RTS Signal*/
}
void PutChar ( unsigned char c )
{
    while ( ( inportb ( 0x02Fd ) & 0x20 ) == 0 );/* Wait til transmitter is ready */
                    
    outportb (0x02F8, c );                    /* then send it */
}
void revice()
{
while(1){
cc=inportb(0x2FD)&0x01;
if(cc!=0){
cm=inportb(0x2F8);
break;
}
}
发送数据正常，怎么写接收数据？谢谢

[ 本帖最后由 zwc 于 2009-9-26 16:10 编辑 ]