105 lines
2.2 KiB
C
105 lines
2.2 KiB
C
/*****************************************************************************
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*
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* COPYRIGHT (C) 1990-1992 COLORADO MEMORY SYSTEMS, INC.
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* COPYRIGHT (C) 1992-1994 HEWLETT-PACKARD COMPANY
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*
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******************************************************************************
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*
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* FILE: \SE\DRIVER\Q117CD\SRC\0X11059.C
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*
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* FUNCTION: cqd_SetXferRates
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*
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* PURPOSE: Sets the slow and fast transfer rates in the CQD context
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*
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* HISTORY:
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* $Log: J:\se.vcs\driver\q117cd\src\0x11059.c $
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*
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* Rev 1.0 09 Dec 1994 09:32:16 MARKMILL
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* Initial revision.
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*
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*****************************************************************************/
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#define FCT_ID 0x11059
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#include "include\public\adi_api.h"
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#include "include\public\frb_api.h"
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#include "include\private\kdi_pub.h"
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#include "include\private\cqd_pub.h"
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#include "q117cd\include\cqd_defs.h"
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#include "q117cd\include\cqd_strc.h"
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#include "q117cd\include\cqd_hdr.h"
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/*endinclude*/
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dVoid cqd_SetXferRates
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(
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/* INPUT PARAMETERS: */
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CqdContextPtr cqd_context
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/* UPDATE PARAMETERS: */
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/* OUTPUT PARAMETERS: */
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)
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/* COMMENTS: *****************************************************************
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*
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* This function determines the fastest and slowest transfer rates that are
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* supported by the FDC and tape drive. The results are stored in the
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* CQD context.
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*
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* DEFINITIONS: *************************************************************/
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{
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/* DATA: ********************************************************************/
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dUByte rate=0;
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dUByte tape_rates=0;
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/* CODE: ********************************************************************/
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tape_rates =
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(dUByte)(cqd_context->device_cfg.supported_rates &
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cqd_context->floppy_tape_parms.tape_rates);
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rate = XFER_2Mbps;
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do {
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if ((rate & tape_rates) != 0) {
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cqd_context->tape_cfg.xfer_fast = (dUByte)rate;
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rate = 0;
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} else {
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rate >>= 1;
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}
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} while (rate != 0);
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rate = XFER_250Kbps;
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do {
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if ((rate & tape_rates) != 0) {
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cqd_context->tape_cfg.xfer_slow = (dUByte)rate;
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rate = 0;
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} else {
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rate <<= 1;
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}
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} while ((rate <= XFER_2Mbps) && (rate != 0));
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if (cqd_context->tape_cfg.xfer_slow !=
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cqd_context->tape_cfg.xfer_fast) {
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cqd_context->tape_cfg.speed_change_ok = dTRUE;
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} else {
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cqd_context->tape_cfg.speed_change_ok = dFALSE;
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}
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}
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