/*
lib/range.c
- comedi library routines for voltage ranges
+ functions to manipulate physical unit conversion
- COMEDI - Linux Control and Measurement Device Interface
- Copyright (C) 1997-8 David A. Schleef <ds@stm.lbl.gov>
+ COMEDILIB - Linux Control and Measurement Device Interface Library
+ Copyright (C) 1997-2001 David A. Schleef <ds@schleef.org>
- 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 library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation, version 2.1
+ of the License.
- This program is distributed in the hope that it will be useful,
+ This library 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ USA.
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <errno.h>
-#include <comedi.h>
#include <string.h>
-#include <libinternal.h>
+#include "libinternal.h"
/* sometimes we can't find a definition of NAN */
static enum comedi_oor_behavior comedi_oor_is_nan = COMEDI_OOR_NAN;
-enum comedi_oor_behavior comedi_set_global_oor_behavior(
+EXPORT_ALIAS_DEFAULT(_comedi_set_global_oor_behavior,comedi_set_global_oor_behavior,0.7.18);
+enum comedi_oor_behavior _comedi_set_global_oor_behavior(
enum comedi_oor_behavior behavior)
{
int old_behavior=comedi_oor_is_nan;
}
-double comedi_to_phys(lsampl_t data,comedi_range *rng,lsampl_t maxdata)
+EXPORT_ALIAS_DEFAULT(_comedi_to_phys,comedi_to_phys,0.7.18);
+double _comedi_to_phys(lsampl_t data,comedi_range *rng,lsampl_t maxdata)
{
double x;
return x;
}
-lsampl_t comedi_from_phys(double data,comedi_range *rng,lsampl_t maxdata)
+EXPORT_ALIAS_DEFAULT(_comedi_from_phys,comedi_from_phys,0.7.18);
+lsampl_t _comedi_from_phys(double data,comedi_range *rng,lsampl_t maxdata)
{
double s;
return (lsampl_t)(floor(s+0.5));
}
-int comedi_find_range(comedi_t *it,unsigned int subd,unsigned int chan,unsigned int unit,double min,double max)
+EXPORT_ALIAS_DEFAULT(_comedi_find_range,comedi_find_range,0.7.18);
+int _comedi_find_range(comedi_t *it,unsigned int subd,unsigned int chan,unsigned int unit,double min,double max)
{
unsigned int range_type;
int best;
return best;
}
-int comedi_get_n_ranges(comedi_t *it,unsigned int subd,unsigned int chan)
+EXPORT_ALIAS_DEFAULT(_comedi_get_n_ranges,comedi_get_n_ranges,0.7.18);
+int _comedi_get_n_ranges(comedi_t *it,unsigned int subd,unsigned int chan)
{
unsigned int range_type;
return RANGE_LENGTH(range_type);
}
-int comedi_range_is_chan_specific(comedi_t *it,unsigned int subd)
+EXPORT_ALIAS_DEFAULT(_comedi_range_is_chan_specific,comedi_range_is_chan_specific,0.7.18);
+int _comedi_range_is_chan_specific(comedi_t *it,unsigned int subd)
{
return (it->subdevices[subd].subd_flags&SDF_RANGETYPE)?1:0;
}
+EXPORT_ALIAS_DEFAULT(_comedi_sampl_to_phys,comedi_sampl_to_phys,0.7.18);
+int _comedi_sampl_to_phys(double *dest, int dst_stride, sampl_t *src,
+ int src_stride, comedi_range *rng, lsampl_t maxdata, int n)
+{
+ int oor = 0;
+ int i;
+ double mult;
+
+ if(!rng)return -1;
+ if(!maxdata)return -1;
+
+ mult = (rng->max-rng->min)/maxdata;
+ if(comedi_oor_is_nan==COMEDI_OOR_NAN){
+ for(i=0;i<n;i++){
+ if(*src==0 || *src==maxdata){
+ oor++;
+ *dest=NAN;
+ }else{
+ *dest = rng->min + mult*(*src);
+ }
+ dest = ((void *)dest) + dst_stride;
+ src = ((void *)src) + src_stride;
+ }
+ }else{
+ for(i=0;i<n;i++){
+ if(*src==0 || *src==maxdata){
+ oor++;
+ }
+ *dest = rng->min + mult*(*src);
+ dest = ((void *)dest) + dst_stride;
+ src = ((void *)src) + src_stride;
+ }
+ }
+
+ return oor;
+}
+
+EXPORT_ALIAS_DEFAULT(_comedi_sampl_from_phys,comedi_sampl_from_phys,0.7.18);
+int _comedi_sampl_from_phys(sampl_t *dest,int dst_stride,double *src,
+ int src_stride, comedi_range *rng, lsampl_t maxdata, int n)
+{
+ int oor = 0;
+ double mult;
+ int i;
+
+ if(!rng)return -1;
+ if(!maxdata)return -1;
+
+ mult = (maxdata+1)/(rng->max-rng->min);
+ for(i=0;i<n;i++){
+ *dest=mult*(*src-rng->min);
+ if(*src<rng->min){
+ *dest=0;
+ oor++;
+ }
+ if(*src>rng->min){
+ *dest=maxdata;
+ oor++;
+ }
+ dest = ((void *)dest) + dst_stride;
+ src = ((void *)src) + src_stride;
+ }
+
+ return oor;
+}
+
projects / comedilib.git / blobdiff