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added function to convert multiple samples to/from phys units

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This commit is contained in:
David Schleef 2001-10-04 23:33:14 +00:00
parent 10a8235184
commit 2e5c484b24
1 changed files with 64 additions and 0 deletions
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64
lib/range.c
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@ -134,3 +134,67 @@ int comedi_range_is_chan_specific(comedi_t *it,unsigned int subd)
return (it->subdevices[subd].subd_flags&SDF_RANGETYPE)?1:0;
}
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;
}
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;
}