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86 lines
1.9 KiB
86 lines
1.9 KiB
#ifdef i386
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//--------------------------------------------------------------------
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//
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// PARALLEL.C
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//
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// Parallel port access file.
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//
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// Revisions:
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// 09-01-92 KJB First.
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// 03-11-93 JAP Changed retcode equates to reflect new names.
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// 03-25-93 JAP Fixed up typedef and prototype inconsistencies
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//--------------------------------------------------------------------
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#include CARDTXXX_H
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//
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// ParallelWaitBusy
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//
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// This routine waits until the busy line is 1.
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//
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USHORT ParallelWaitBusy (PBASE_REGISTER baseIoAddress, ULONG usec, PUCHAR data)
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{
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ULONG i;
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// see if the flag comes back quickly
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for (i = 0; i < TIMEOUT_QUICK; i++) {
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ParallelPortGet (baseIoAddress, PARALLEL_STATUS, data);
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if (*data & P_BUSY) {
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return 0;
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}
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}
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// ok, it did not come back quickly, we will yield to other processes
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for (i = 0; i < usec; i++) {
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ParallelPortGet (baseIoAddress, PARALLEL_STATUS, data);
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if (*data & P_BUSY) {
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return 0;
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}
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ScsiPortStallExecution (1);
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}
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// return with an error, non-zero indicates timeout
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return RET_STATUS_TIMEOUT;
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}
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//
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// ParallelWaitNoBusy
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//
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// This routine waits until the busy line is 0.
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//
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USHORT ParallelWaitNoBusy (PBASE_REGISTER baseIoAddress, ULONG usec, PUCHAR data)
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{
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ULONG i;
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// see if the flag comes back quickly
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for (i = 0; i < TIMEOUT_QUICK; i++) {
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ParallelPortGet (baseIoAddress, PARALLEL_STATUS, data);
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if (!(*data & P_BUSY)) {
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return 0;
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}
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}
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// ok, it did not come back quickly, we will yield to other processes
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for (i = 0; i < usec; i++) {
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ParallelPortGet (baseIoAddress, PARALLEL_STATUS, data);
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if (!(*data & P_BUSY)) {
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return 0;
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}
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ScsiPortStallExecution (1);
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}
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// return with an error, non-zero indicates timeout
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return RET_STATUS_TIMEOUT;
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}
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#endif
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