參數(shù)資料
型號： CD1284
廠商： Intel Corp.
英文描述： IEEE 1284-Compatible Parallel Interface Controller with Two High-Speed Asynchronous Serial Ports
中文描述： 符合IEEE 1284兼容并行接口控制器兩個高速異步串行端口
文件頁數(shù)： 95/176頁
文件大小： 2255K
代理商： CD1284
IEEE 1284-Compatible Parallel Interface Controller
—
CD1284
Datasheet
95
switch (status) {
case 1:
/* all values that include a receive
request */
case 3:
case 5:
case 7:
case 0xF:
rx_stat = service_rec( );
return(rx_stat);
break;
case 2:
/* all values that include transmit but
not receive */
case 6:
case 0xA:
case 0xE:
tx_stat = service_txm( );
return(tx_stat);
break;
case 4:
case 0xC:
md_stat = service_mdm( );
return(md_stat);
break;
case: 8:
par_stat = service_par();
return(par_stat);
break;
default:
break;
/* modem service request */
/* parallel port service request */
/* can
’
t happen */
}
}
}
Once the code above locates an active request posted in the SVRR, it calls the appropriate
subroutine to service the request. The service routines follow.
6.3.1.2
Serial Receive Service
/* The receive service acknowledge cycle begins by reading the RIR. This register
contains the necessary information to switch the CD1284 into the correct service
acknowledge context. The RIR is saved for use at the end of the routine and then
copied into the CAR. The act of copying the RIR into the CAR forces the context
switch. The channel number requesting service is extracted from the RIR. The RIVR
register indicates whether the request is for good data or exception data and is
used to correctly handle the request. At the end of the service, the upper two bits
in the RIR are cleared causing the switch out of the service acknowledge context. */
service_rec( )
{
char
int
serv_type, save_rir, save_car, channel, status, char;
char_count, i;
save_rir = inportb(RIR);
value */
channel = save_rir & 0x03;
save_car = inportb(CAR);
outportb(CAR, save_rir);
*/
serv_type = inportb(RIVR) & 0x07; /* read vector register; get type (good/
exception)*/
switch (serv_type) {
case 3:
char_count = inportb(RDCR);
characters in FIFO */
for ( i = 1; i <= char_count; i++) {/* - read that number of
chars */
char = inportb(RDSR);
/* retrieve and save receive interrupt
/* extract channel number from the RIR*/
/* save CAR for restore */
/* switch CD1284 to service ack. context
/* good data service */
/* get number of
/* read char from FIFO */
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