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128 lines
3.3 KiB
128 lines
3.3 KiB
/*****************************************************************************
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*
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* Copyright (c) 1996-1999 Microsoft Corporation
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*
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* @doc
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* @module comm.c | IrSIR NDIS Miniport Driver
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* @comm
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*
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*-----------------------------------------------------------------------------
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*
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* Author: Scott Holden (sholden)
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*
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* Date: 10/1/1996 (created)
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*
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* Contents:
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*
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*****************************************************************************/
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#include "irsir.h"
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/*****************************************************************************
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*
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* Function: SetSpeed
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*
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* Synopsis: Set the baud rate of the uart and the dongle.
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*
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* Arguments: pThisDev - pointer to ir device to set the link speed
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*
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* Returns: STATUS_SUCCESS
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* STATUS_UNSUCCESSFUL
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*
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* Algorithm:
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*
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* History: dd-mm-yyyy Author Comment
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* 10/2/1996 sholden author
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*
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* Notes:
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* This function will only be called once we know that all
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* outstanding receives and sends to the serial port have
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* been completed.
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*
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* This routine must be called from IRQL PASSIVE_LEVEL.
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*
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*****************************************************************************/
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NTSTATUS
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SetSpeed(
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PIR_DEVICE pThisDev
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)
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{
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ULONG bitsPerSec, dwNotUsed;
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NTSTATUS status;
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UCHAR c[2];
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DEBUGMSG(DBG_FUNC, ("+SetSpeed\n"));
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if (pThisDev->linkSpeedInfo)
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{
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bitsPerSec = (ULONG)pThisDev->linkSpeedInfo->bitsPerSec;
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}
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else
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{
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bitsPerSec = 9600;
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DEBUGMSG(DBG_ERROR, ("IRSIR: pThisDev->linkSpeedInfo not set\n"));
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}
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DEBUGMSG(DBG_STAT, (" Requested speed = %d\n", bitsPerSec));
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ASSERT(KeGetCurrentIrql() < DISPATCH_LEVEL);
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// We need to be certain any data sent previously was flushed.
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// Since there are so many serial devices out there, and they
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// seem to handle flushing differently, send a little extra
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// data out to act as a plunger.
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c[0] = c[1] = SLOW_IR_EXTRA_BOF;
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(void)SerialSynchronousWrite(pThisDev->pSerialDevObj,
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c, sizeof(c), &dwNotUsed);
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// And just for good measure.
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NdisMSleep(50000);
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//
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// The dongle is responsible for performing the SerialSetBaudRate
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// to set the UART to the correct speed it requires for
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// performing commands and changing the rate of the dongle.
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//
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//
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// Set the speed of the dongle to the requested speed.
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//
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status = pThisDev->dongle.SetSpeed(
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pThisDev->pSerialDevObj,
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bitsPerSec,
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pThisDev->currentSpeed
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);
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if (status != STATUS_SUCCESS)
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{
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goto done;
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}
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//
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// Set the speed of the UART to the requested speed.
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//
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status = SerialSetBaudRate(
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pThisDev->pSerialDevObj,
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&bitsPerSec
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);
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if (status != STATUS_SUCCESS)
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{
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goto done;
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}
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//
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// Update our current speed.
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//
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pThisDev->currentSpeed = bitsPerSec;
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done:
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DEBUGMSG(DBG_FUNC, ("-SetSpeed\n"));
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return status;
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}
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