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sane-project-backends/backend/sm3600-homerun.c

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/* sane - Scanner Access Now Easy.
Copyright (C) 1996, 1997 David Mosberger-Tang
This file is part of the SANE package.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA.
As a special exception, the authors of SANE give permission for
additional uses of the libraries contained in this release of SANE.
The exception is that, if you link a SANE library with other files
to produce an executable, this does not by itself cause the
resulting executable to be covered by the GNU General Public
License. Your use of that executable is in no way restricted on
account of linking the SANE library code into it.
This exception does not, however, invalidate any other reasons why
the executable file might be covered by the GNU General Public
License.
If you submit changes to SANE to the maintainers to be included in
a subsequent release, you agree by submitting the changes that
those changes may be distributed with this exception intact.
If you write modifications of your own for SANE, it is your choice
whether to permit this exception to apply to your modifications.
If you do not wish that, delete this exception notice.
This file implements a dynamic linking based SANE meta backend. It
allows managing an arbitrary number of SANE backends by using
dynamic linking to load backends on demand. */
/* ======================================================================
Userspace scan tool for the Microtek 3600 scanner
slider movement
(C) Marian Eichholz 2001
====================================================================== */
#include "sm3600-scantool.h"
#include <math.h>
/* tuning constants for DoOriginate */
#define CCH_BONSAI 60
#define BLACK_HOLE_GRAY 30
#define CHASSIS_GRAY_LEVEL 100
#define BLACK_BED_LEVEL 10
typedef enum { ltHome, ltUnknown, ltBed, ltError } TLineType;
#define INST_ASSERT2() { if (this->nErrorState) return ltError; }
static unsigned char auchRegsSingleLine[]={
0x00 /*0x01*/, 0x00 /*0x02*/, 0x3F /*0x03*/,
0xB4 /*!!0x04!!*/, 0x14 /*!!0x05!!*/, 0,0,
0x00 /*0x08*/, 0x3F /*!!0x09!!*/,
1,0,
0x6D /*0x0C*/,
0x70 /*0x0D*/, 0x69 /*0x0E*/, 0xD0 /*0x0F*/,
0x00 /*0x10*/, 0x00 /*0x11*/, 0x40 /*0x12*/,
0x15 /*0x13*/, 0x80 /*0x14*/, 0x2A /*0x15*/,
0xC0 /*0x16*/, 0x40 /*0x17*/, 0xC0 /*0x18*/,
0x40 /*0x19*/, 0xFF /*0x1A*/, 0x01 /*0x1B*/,
0x88 /*0x1C*/, 0x40 /*0x1D*/, 0x4C /*0x1E*/,
0x50 /*0x1F*/, 0x00 /*0x20*/, 0x0C /*0x21*/,
0x21 /*0x22*/, 0xF0 /*0x23*/, 0x40 /*0x24*/,
0x00 /*0x25*/, 0x0A /*0x26*/, 0xF0 /*0x27*/,
0x00 /*0x28*/, 0x00 /*0x29*/, 0x4E /*0x2A*/,
0xF0 /*0x2B*/, 0x00 /*0x2C*/, 0x00 /*0x2D*/,
0x4E /*0x2E*/, 0x88 /*R_CCAL*/, 0x88 /*R_CCAL2*/,
0x84 /*R_CCAL3*/, 0xEA /*R_LEN*/, 0x24 /*R_LENH*/,
0x63 /*0x34*/, 0x29 /*0x35*/, 0x00 /*0x36*/,
0x00 /*0x37*/, 0x00 /*0x38*/, 0x00 /*0x39*/,
0x00 /*0x3A*/, 0x00 /*0x3B*/, 0xFF /*0x3C*/,
0x0F /*0x3D*/, 0x00 /*0x3E*/, 0x00 /*0x3F*/,
0x01 /*0x40*/, 0x00 /*0x41*/, 0x00 /*R_CSTAT*/,
0x03 /*R_SPD*/, 0x01 /*0x44*/, 0x00 /*0x45*/,
0x59 /*!!R_CTL!!*/, 0xC0 /*0x47*/, 0x40 /*0x48*/,
0x96 /*!!0x49!!*/, 0xD8 /*0x4A*/ };
/* ======================================================================
GetLineType()
Reads a scan line at the actual position and classifies it as
"on the flatbed area" or "at home position" or "elsewhere".
This can be used to calculate the proper stepping width
====================================================================== */
static TLineType GetLineType(TInstance *this)
{
unsigned char achLine[CCH_BONSAI+1];
unsigned char *puchBuffer;
int cchBulk,i,iHole;
int axHoles[3];
long lSum;
TBool bHolesOk;
int lMedian;
bHolesOk=false;
RegWriteArray(this,R_ALL, 74, auchRegsSingleLine);
INST_ASSERT2();
/* dprintf(DEBUG_SCAN,"originate-%d...",iStripe); */
RegWrite(this,R_CTL, 1, 0x59); /* #2496[062.5] */
RegWrite(this,R_CTL, 1, 0xD9); /* #2497[062.5] */
i=WaitWhileScanning(this,5); if (i) return i;
cchBulk=MAX_PIXEL_PER_SCANLINE;
/*
cchBulk=RegRead(this,R_STAT, 2);
if (cchBulk!=MAX_PIXEL_PER_SCANLINE)
return SetError(this,SANE_STATUS_INVAL,
"illegal scan line width reported (%d)",cchBulk);
*/
puchBuffer=(unsigned char*)calloc(1,cchBulk);
CHECK_POINTER(puchBuffer);
if (BulkReadBuffer(this,puchBuffer, cchBulk)!=cchBulk)
{
free(puchBuffer);
return SetError(this,SANE_STATUS_IO_ERROR,"truncated bulk");
}
lSum=0;
for (i=0; i<cchBulk; i++)
lSum+=puchBuffer[i]; /* gives total white level */
for (i=0; i<CCH_BONSAI; i++)
{
int iBulk=i*(cchBulk)/CCH_BONSAI;
achLine[i]=puchBuffer[iBulk+40]; /* simple, basta */
}
/* the bonsai line is supported only for curiosity */
for (i=0; i<CCH_BONSAI; i++)
achLine[i]=achLine[i]/26+'0'; /* '0'...'9' */
achLine[CCH_BONSAI]='\0';
i=200;
iHole=0;
dprintf(DEBUG_ORIG,"");
while (i<MAX_PIXEL_PER_SCANLINE && iHole<3)
{
int c;
while (i<MAX_PIXEL_PER_SCANLINE && puchBuffer[i]>BLACK_HOLE_GRAY) i++; /* not very black */
c=0;
dprintf(DEBUG_ORIG,"~ i=%d",i);
while (i<MAX_PIXEL_PER_SCANLINE && puchBuffer[i]<=BLACK_HOLE_GRAY) { i++; c++; }
dprintf(DEBUG_ORIG,"~ c=%d",c);
if (c>90) /* 90% of min hole diameter */
{
axHoles[iHole]=i-c/2; /* store the middle of the hole */
dprintf(DEBUG_ORIG,"~ #%d=%d",iHole,axHoles[iHole]);
iHole++;
i+=10; /* some hysteresis */
}
}
if (iHole==3)
{
bHolesOk=true;
for (i=0; i<2; i++)
{
int n=axHoles[i+1]-axHoles[i];
if (n<1050 || n>1400)
bHolesOk=false;
}
if (axHoles[0]<400 || axHoles[0]>900) /* 2 cm tolerance */
bHolesOk=false;
}
else
bHolesOk=false;
lMedian=lSum/cchBulk;
/* this is *definitly* dirty style. We should pass the information
by other means... */
if (bHolesOk)
{
this->calibration.xMargin=axHoles[0]-480; /* left bed corner */
this->calibration.nHoleGray=puchBuffer[axHoles[0]]; /* black reference */
}
dprintf(DEBUG_ORIG,"~ %s - %d\n",
achLine,
lMedian);
free(puchBuffer);
i=WaitWhileBusy(this,2); if (i) return i;
if (bHolesOk && lMedian>CHASSIS_GRAY_LEVEL)
return ltHome;
if (lMedian<=BLACK_BED_LEVEL)
return ltBed;
return ltUnknown;
}
/* **********************************************************************
DoCalibration
********************************************************************** */
#define CALIB_START 200
#define CALIB_LINES 8
#define CALIB_GAP 10
#define SM3600_CALIB_USE_MEDIAN
#ifdef SM3600_CALIB_USE_MEDIAN
typedef int (*TQSortProc)(const void *, const void *);
static
int CompareProc(const unsigned char *p1, const unsigned char *p2)
{
return *p1 - *p2;
}
#endif
__SM3600EXPORT__
TState DoCalibration(TInstance *this)
{
#ifdef SM3600_CALIB_USE_RMS
long aulSum[MAX_PIXEL_PER_SCANLINE];
#endif
#ifdef SM3600_CALIB_USE_MEDIAN
unsigned char aauchY[CALIB_LINES][MAX_PIXEL_PER_SCANLINE];
unsigned char auchRow[CALIB_LINES];
#endif
int iLine,i;
TState rc;
if (this->calibration.bCalibrated)
return SANE_STATUS_GOOD;
DoJog(this,CALIB_START);
/* scan a gray line at 600 DPI */
if (!this->calibration.achStripeY)
{
this->calibration.achStripeY=calloc(1,MAX_PIXEL_PER_SCANLINE);
if (!this->calibration.achStripeY)
return SetError(this,SANE_STATUS_NO_MEM,"no memory for calib Y");
}
#ifdef SM3600_CALIB_USE_RMS
memset(aulSum,0,sizeof(aulSum));
#endif
for (iLine=0; iLine<CALIB_LINES; iLine++)
{
dprintf(DEBUG_CALIB,"calibrating %i...\n",iLine);
RegWriteArray(this,R_ALL, 74, auchRegsSingleLine);
INST_ASSERT();
RegWrite(this,R_CTL, 1, 0x59); /* #2496[062.5] */
RegWrite(this,R_CTL, 1, 0xD9); /* #2497[062.5] */
rc=WaitWhileScanning(this,5); if (rc) { return rc; }
if (BulkReadBuffer(this,
#ifdef SM3600_CALIB_USE_RMS
this->calibration.achStripeY,
#endif
#ifdef SM3600_CALIB_USE_MEDIAN
aauchY[iLine],
#endif
MAX_PIXEL_PER_SCANLINE)
!=MAX_PIXEL_PER_SCANLINE)
return SetError(this,SANE_STATUS_IO_ERROR,"truncated bulk");
#ifdef SM3600_CALIB_USE_RMS
for (i=0; i<MAX_PIXEL_PER_SCANLINE; i++)
aulSum[i]+=(long)this->calibration.achStripeY[i]*
(long)this->calibration.achStripeY[i];
#endif
DoJog(this,CALIB_GAP);
}
#ifdef SM3600_CALIB_USE_RMS
for (i=0; i<MAX_PIXEL_PER_SCANLINE; i++)
this->calibration.achStripeY[i]=(unsigned char)(int)sqrt(aulSum[i]/CALIB_LINES);
#endif
#ifdef SM3600_CALIB_USE_MEDIAN
/* process the collected lines rowwise. Use intermediate buffer for qsort */
for (i=0; i<MAX_PIXEL_PER_SCANLINE; i++)
{
for (iLine=0; iLine<CALIB_LINES; iLine++)
auchRow[iLine]=aauchY[iLine][i];
qsort(auchRow,CALIB_LINES, sizeof(unsigned char), (TQSortProc)CompareProc);
this->calibration.achStripeY[i]=auchRow[(CALIB_LINES-1)/2];
}
#endif
/* intentionally, I did *not* apply a hanning filter. Discussion
welcome :-) */
/* scan a color line at 600 DPI */
DoJog(this,-CALIB_START-CALIB_LINES*CALIB_GAP);
INST_ASSERT();
this->calibration.bCalibrated=true;
return SANE_STATUS_GOOD;
}
/* **********************************************************************
DoOriginate()
*shall* one time move the slider safely back to its origin.
No idea, hoiw to achieve this, for now...
********************************************************************** */
__SM3600EXPORT__
TState DoOriginate(TInstance *this, TBool bStepOut)
{
TLineType lt;
if (this->bVerbose)
fprintf(stderr,"carriage return...\n");
DBG(DEBUG_INFO,"DoOriginate()\n");
INST_ASSERT();
lt=GetLineType(this);
/* if we are already at home, fine. If not, first jump a bit forward */
DBG(DEBUG_JUNK,"lt1=%d\n",(int)lt);
if (lt!=ltHome && bStepOut) DoJog(this,150);
while (lt!=ltHome && !this->state.bCanceled)
{
lt=GetLineType(this);
DBG(DEBUG_JUNK,"lt2=%d\n",(int)lt);
INST_ASSERT();
switch (lt)
{
case ltHome: continue;
case ltBed: DoJog(this,-240); break; /* worst case: 1 cm */
default: DoJog(this,-15); break; /* 0.X mm */
}
}
DoJog(this,1); INST_ASSERT(); /* Correction for 1 check line */
DBG(DEBUG_JUNK,"lt3=%d\n",(int)lt);
if (this->state.bCanceled)
return SANE_STATUS_CANCELLED;
return DoCalibration(this);
}
/* **********************************************************************
DoJog(nDistance)
The distance is given in 600 DPI.
********************************************************************** */
__SM3600EXPORT__
TState DoJog(TInstance *this, int nDistance)
{
int cSteps;
int nSpeed,nRest;
dprintf(DEBUG_SCAN,"jogging %d units...\n",nDistance);
if (!nDistance) return 0;
RegWrite(this,0x34, 1, 0x63);
RegWrite(this,0x49, 1, 0x96);
WaitWhileBusy(this,2);
RegWrite(this,0x34, 1, 0x63);
RegWrite(this,0x49, 1, 0x9E); /* that is a difference! */
INST_ASSERT();
cSteps=(nDistance>0) ? nDistance : -nDistance;
{
unsigned char uchRegs2587[]={
0x00 /*0x01*/, 0x00 /*0x02*/, 0x3F /*0x03*/,
0x40 /*!!0x04!!*/, 0x00 /*!!0x05!!*/,
0,0, /* steps */
0x00 /*0x08*/, 0x00 /*!!0x09!!*/,
0,0, /* y count */
0x6D /*0x0C*/,
0x70 /*0x0D*/, 0x69 /*0x0E*/, 0xD0 /*0x0F*/,
0x00 /*0x10*/, 0x00 /*0x11*/, 0x40 /*0x12*/,
0x15 /*0x13*/, 0x80 /*0x14*/, 0x2A /*0x15*/,
0xC0 /*0x16*/, 0x40 /*0x17*/, 0xC0 /*0x18*/,
0x40 /*0x19*/, 0xFF /*0x1A*/, 0x01 /*0x1B*/,
0x88 /*0x1C*/, 0x40 /*0x1D*/, 0x4C /*0x1E*/,
0x50 /*0x1F*/, 0x00 /*0x20*/, 0x0C /*0x21*/,
0x21 /*0x22*/, 0xF0 /*0x23*/, 0x40 /*0x24*/,
0x00 /*0x25*/, 0x0A /*0x26*/, 0xF0 /*0x27*/,
0x00 /*0x28*/, 0x00 /*0x29*/, 0x4E /*0x2A*/,
0xF0 /*0x2B*/, 0x00 /*0x2C*/, 0x00 /*0x2D*/,
0x4E /*0x2E*/, 0x88 /*R_CCAL*/, 0x88 /*R_CCAL2*/,
0x84 /*R_CCAL3*/, 0xEA /*R_LEN*/, 0x24 /*R_LENH*/,
0x63 /*0x34*/, 0x29 /*0x35*/, 0x00 /*0x36*/,
0x00 /*0x37*/, 0x00 /*0x38*/, 0x00 /*0x39*/,
0x00 /*0x3A*/, 0x00 /*0x3B*/, 0xFF /*0x3C*/,
0x0F /*0x3D*/, 0x00 /*0x3E*/, 0x00 /*0x3F*/,
0x01 /*0x40*/, 0x00 /*0x41*/, 0x80 /*R_CSTAT*/,
0x03 /*R_SPD*/, 0x01 /*0x44*/, 0x00 /*0x45*/,
0x79 /*!!R_CTL!!*/, 0xC0 /*0x47*/, 0x40 /*0x48*/,
0x9E /*!!0x49!!*/, 0xD8 /*0x4A*/ };
RegWriteArray(this,R_ALL, 74, uchRegs2587);
} /* #2587[065.4] */
INST_ASSERT();
RegWrite(this,R_STPS,2,cSteps);
/* do some magic for slider acceleration */
if (cSteps>600) /* only large movements are accelerated */
{
RegWrite(this,0x34, 1, 0xC3);
RegWrite(this,0x47, 2, 0xA000); /* initial speed */
}
/* start back or forth movement */
if (nDistance>0)
{
RegWrite(this,R_CTL, 1, 0x39); /* #2588[065.4] */
RegWrite(this,R_CTL, 1, 0x79); /* #2589[065.4] */
RegWrite(this,R_CTL, 1, 0xF9); /* #2590[065.4] */
}
else
{
RegWrite(this,R_CTL, 1, 0x59);
RegWrite(this,R_CTL, 1, 0xD9);
}
INST_ASSERT();
/* accelerate the slider each 100 us */
if (cSteps>600)
{
nRest=cSteps;
for (nSpeed=0x9800; nRest>600 && nSpeed>=0x4000; nSpeed-=0x800)
{
nRest=RegRead(this,R_POS, 2);
usleep(100);
/* perhaps 40C0 is the fastest possible value */
RegWrite(this,0x47, 2, nSpeed>0x4000 ? nSpeed : 0x40C0);
}
}
INST_ASSERT();
usleep(100);
return WaitWhileBusy(this,100);
}
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