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140 lines
3.9 KiB
C
140 lines
3.9 KiB
C
/*
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File: input.c
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Contains: This file contains the hardware specific user input routines for backlight control.
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Written by: Andy Gong x6595
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Copyright: © 1991-1992 by Apple Computer, Inc. All rights reserved.
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This file is used in these builds: ROM
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Change History (most recent first):
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<SM1> 2/11/93 CSS Checked in from Horror.
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<1> 6/30/92 ag new today
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*/
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/*page*/
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/************************************/
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/*** INCLUDE FILES DECLARATIONS ***/
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#include <SysEqu.h>
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#include <types.h>
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#include <errors.h>
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#include "PowerMgr.h"
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#include "backlight.h"
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#define READ_ATOD_CHANNEL 0xD8
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#define READ_BUTTON_VALUE 0xD9
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extern short PotInputRangeShiftTblPWM[];
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/*page
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***************************************************************************************************
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*
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*
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***************************************************************************************************
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*/
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unsigned char Get_AtoD(int channel)
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{
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PMgrPBlock pb; /* power manager pb */
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char atodChannel; /* a to d channel to read [0-8] */
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unsigned char value; /* return value */
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OSErr error; /* pmgr error */
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atodChannel = channel; /* load channel value into buffer */
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pb.pmgrCmd = READ_ATOD_CHANNEL; /* load read channel command */
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pb.pmgrCnt = 1; /* transmit buffer count is 1 byte */
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pb.pmgrXPtr = &atodChannel; /* pointer to transmit buffer */
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pb.pmgrRPtr = &value; /* pointer to receive buffer */
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error = PMgr(&pb);
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return( (error) ? 0 : value);
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};
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/*page
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***************************************************************************************************
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*
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*
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***************************************************************************************************
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*/
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unsigned char Get_PGEButton(int channel)
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{
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PMgrPBlock pb; /* power manager pb */
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char atodChannel; /* a to d channel to read [0-8] */
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unsigned char value; /* return value */
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OSErr error; /* pmgr error */
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atodChannel = channel; /* load channel value into buffer */
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pb.pmgrCmd = READ_BUTTON_VALUE; /* load read channel command */
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pb.pmgrCnt = 1; /* transmit buffer count is 1 byte */
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pb.pmgrXPtr = &atodChannel; /* pointer to transmit buffer */
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pb.pmgrRPtr = &value; /* pointer to receive buffer */
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error = PMgr(&pb);
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return( (error) ? 0 : value);
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};
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/*page
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***************************************************************************************************
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*
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*
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***************************************************************************************************
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*/
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unsigned char GetPortableValues(int parameter)
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{
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PMgrPBlock pb; /* power manager pb */
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OSErr err; /* power manager error */
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unsigned char rbuf[3]; /* buffer for send command */
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pb.pmgrCmd = BatteryStatusImmCmd; /* on old pmgr, read battery status (immediate not averaged) */
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pb.pmgrCnt = 0;
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pb.pmgrXPtr = nil;
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pb.pmgrRPtr = rbuf;
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err = PMgr(&pb);
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return( (err) ? 0 : rbuf[parameter]); /* return 0 if error, else read value */
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}
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/*page
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***************************************************************************************************
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*
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*
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***************************************************************************************************
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*/
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int PotControl (driverGlobalPtr globalPtr)
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{
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#pragma unused (globalPtr)
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unsigned int potvalue;
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potvalue = (* (intFunction)(globalPtr->hardwareDependentPtr))();
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if (abs(globalPtr->lastatod - potvalue) <= 5) /* was the change less than 100mv */
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potvalue = globalPtr->lastatod; /* is less than, the use old value */
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globalPtr->lastatod = potvalue; /* update last a to d value */
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potvalue >>= 3; /* scale to 0 to 31 */
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if (potvalue) /* if non-zero, check for subrange limiting */
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{
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potvalue >>= PotInputRangeShiftTblPWM[globalPtr->powerRange]; /* rescale in low power levels */
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if (!potvalue) potvalue = 1; /* make sure we don't change the backlight state */
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};
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return(potvalue);
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};
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