112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
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/*++
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Copyright (C) Microsoft Corporation, 1993 - 1998
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Module Name:
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sppieee.c
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Abstract:
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This module contains code for the host to utilize an ieee version of
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compatibility mode
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Author:
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Robbie Harris (Hewlett-Packard) 29-July-1998
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Environment:
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Kernel mode
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Revision History :
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--*/
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#include "pch.h"
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NTSTATUS
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SppIeeeWrite(
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IN PPDO_EXTENSION Extension,
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IN PVOID Buffer,
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IN ULONG BytesToWrite,
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OUT PULONG BytesTransferred
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)
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/*++
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Routine Description:
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Arguments:
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Extension - Supplies the device extension.
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Return Value:
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None.
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--*/
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{
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NTSTATUS status = STATUS_SUCCESS;
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PUCHAR Controller = Extension->Controller;
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PUCHAR pPortDCR = Extension->Controller + OFFSET_DCR;
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PUCHAR pPortData = Extension->Controller + OFFSET_DATA;
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ULONG wByteCount = BytesToWrite;
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UCHAR bDCRstrobe; // Holds precomputed value for state 35
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UCHAR bDCRnormal; // Holds precomputed value for state 37
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PUCHAR lpsBufPtr = (PUCHAR)Buffer; // Pointer to buffer cast to desired data type
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// Make precomputed DCR values for strobe and periph ack
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bDCRstrobe = SET_DCR(DIR_WRITE, IRQEN_DISABLE, ACTIVE, ACTIVE, ACTIVE, INACTIVE);
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bDCRnormal = SET_DCR(DIR_WRITE, IRQEN_DISABLE, ACTIVE, ACTIVE, ACTIVE, ACTIVE);
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// Wait a bit to give nBusy a chance to settle, because
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// WriteComm will bail immediately if the device says busy
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if ( CHECK_DSR( Controller,
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INACTIVE, DONT_CARE, DONT_CARE, DONT_CARE, DONT_CARE,
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IEEE_MAXTIME_TL ) )
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{
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while (wByteCount)
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{
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// Place a data byte on the bus
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P5WritePortUchar(pPortData, *lpsBufPtr);
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// Start handshake by dropping strobe
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P5WritePortUchar(pPortDCR, bDCRstrobe);
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// Wait for Periph Busy Response
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if ( !CHECK_DSR(Controller, ACTIVE, DONT_CARE, DONT_CARE,
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DONT_CARE, DONT_CARE, IEEE_MAXTIME_TL) )
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{
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status = STATUS_DEVICE_BUSY;
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break;
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}
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// Printer responded by making Busy high -- the byte has
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// been accepted. Adjust the data pointer.
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lpsBufPtr++;
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// Finish handshake by raising strobe
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P5WritePortUchar(pPortDCR, bDCRnormal);
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// Adjust count while we're waiting for the peripheral
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// to respond with state 32
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wByteCount--;
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// Wait for PeriphAck and PeriphBusy response
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if ( !CHECK_DSR(Controller, INACTIVE, ACTIVE, DONT_CARE, DONT_CARE,
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DONT_CARE, IEEE_MAXTIME_TL) )
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{
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// Set appropriate error based on relaxed timeout.
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status = STATUS_DEVICE_BUSY;
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break;
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}
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} // while...
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*BytesTransferred = BytesToWrite - wByteCount; // Set current count.
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}
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return status;
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}
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