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offset unipolar ground observable targets half a bit above zero

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This commit is contained in:
Frank Mori Hess 2003-04-29 01:50:46 +00:00
parent 7041bcca95
commit 78f9e1b83d
1 changed files with 18 additions and 2 deletions
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20
comedi_calibrate/ni.c
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@ -268,6 +268,14 @@ static void ni_setup_observables( calibration_setup_t *setup )
o->target = voltage_reference;
if(unipolar_lowgain>=0){
comedi_range *range;
int max_data;
range = comedi_get_range( setup->dev, setup->ad_subdev, 0, unipolar_lowgain );
assert( range != NULL );
max_data = comedi_get_maxdata( setup->dev, setup->ad_subdev, 0 );
assert( max_data > 0 );
o = setup->observables + ni_unip_zero_offset_low;
o->name = "ai, unipolar zero offset, low gain";
o->observe_insn = tmpl;
@ -275,7 +283,7 @@ static void ni_setup_observables( calibration_setup_t *setup )
CR_PACK(REF_GND_GND,unipolar_lowgain,AREF_OTHER)
| CR_ALT_SOURCE | CR_ALT_FILTER;
o->reference_source = REF_GND_GND;
o->target = 0.0;
o->target = comedi_to_phys( 1, range, max_data ) / 2.0;
o = setup->observables + ni_unip_reference_low;
o->name = "ai, unipolar voltage reference, low gain";
@ -289,6 +297,14 @@ static void ni_setup_observables( calibration_setup_t *setup )
if(unipolar_highgain >= 0)
{
comedi_range *range;
int max_data;
range = comedi_get_range( setup->dev, setup->ad_subdev, 0, unipolar_highgain );
assert( range != NULL );
max_data = comedi_get_maxdata( setup->dev, setup->ad_subdev, 0 );
assert( max_data > 0 );
o = setup->observables + ni_unip_zero_offset_high;
o->name = "ai, unipolar zero offset, high gain";
o->observe_insn = tmpl;
@ -296,7 +312,7 @@ static void ni_setup_observables( calibration_setup_t *setup )
CR_PACK(REF_GND_GND,unipolar_highgain,AREF_OTHER)
| CR_ALT_SOURCE | CR_ALT_FILTER;
o->reference_source = REF_GND_GND;
o->target = 0.0;
o->target = comedi_to_phys( 1, range, max_data ) / 2.0;
}
if(setup->da_subdev>=0){