3 functions for setting calibration
5 Copyright (C) 2003 Frank Mori Hess <fmhess@users.sourceforge.net
7 This library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation, version 2.1
12 This library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with this library; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
30 #include "libinternal.h"
32 static int set_calibration( comedi_t *dev, const comedi_calibration_t *parsed_file,
33 unsigned int cal_index );
35 static int check_cal_file( comedi_t *dev, const comedi_calibration_t *parsed_file )
37 if( strcmp( comedi_get_driver_name( dev ), parsed_file->driver_name ) )
39 COMEDILIB_DEBUG( 3, "driver name does not match '%s' from calibration file\n",
40 parsed_file->driver_name );
44 if( strcmp( comedi_get_board_name( dev ), parsed_file->board_name ) )
46 COMEDILIB_DEBUG( 3, "board name does not match '%s' from calibration file\n",
47 parsed_file->board_name );
54 static inline int valid_channel( const comedi_calibration_t *parsed_file,
55 unsigned int cal_index, unsigned int channel )
59 num_channels = parsed_file->settings[ cal_index ].num_channels;
60 if( num_channels == 0 ) return 1;
61 for( i = 0; i < num_channels; i++ )
63 if( parsed_file->settings[ cal_index ].channels[ i ] == channel )
70 static inline int valid_range( const comedi_calibration_t *parsed_file,
71 unsigned int cal_index, unsigned int range )
75 num_ranges = parsed_file->settings[ cal_index ].num_ranges;
76 if( num_ranges == 0 ) return 1;
77 for( i = 0; i < num_ranges; i++ )
79 if( parsed_file->settings[ cal_index ].ranges[ i ] == range )
86 static inline int valid_aref( const comedi_calibration_t *parsed_file,
87 unsigned int cal_index, unsigned int aref )
91 num_arefs = parsed_file->settings[ cal_index ].num_arefs;
92 if( num_arefs == 0 ) return 1;
93 for( i = 0; i < num_arefs; i++ )
95 if( parsed_file->settings[ cal_index ].arefs[ i ] == aref )
102 static int apply_calibration( comedi_t *dev, const comedi_calibration_t *parsed_file,
103 unsigned int subdev, unsigned int channel, unsigned int range, unsigned int aref )
105 int num_cals, i, retval;
108 num_cals = parsed_file->num_settings;
110 for( i = 0; i < num_cals; i++ )
112 if( parsed_file->settings[ i ].subdevice != subdev ) continue;
113 if( valid_range( parsed_file, i, range ) == 0 ) continue;
114 if( valid_channel( parsed_file, i, channel ) == 0 ) continue;
115 if( valid_aref( parsed_file, i, aref ) == 0 ) continue;
117 retval = set_calibration( dev, parsed_file, i );
118 if( retval < 0 ) return retval;
123 COMEDILIB_DEBUG( 3, "failed to find matching calibration\n" );
130 static int set_calibration( comedi_t *dev, const comedi_calibration_t *parsed_file,
131 unsigned int cal_index )
133 int i, retval, num_caldacs;
135 num_caldacs = parsed_file->settings[ cal_index ].num_caldacs;
136 COMEDILIB_DEBUG( 4, "num_caldacs %i\n", num_caldacs );
138 for( i = 0; i < num_caldacs; i++ )
140 comedi_caldac_t caldac;
142 caldac = parsed_file->settings[ cal_index ].caldacs[ i ];
143 COMEDILIB_DEBUG( 4, "subdev %i, ch %i, val %i\n", caldac.subdevice,
144 caldac.channel,caldac.value);
145 retval = comedi_data_write( dev, caldac.subdevice, caldac.channel,
146 0, 0, caldac.value );
147 if( retval < 0 ) return retval;
153 EXPORT_ALIAS_DEFAULT(_comedi_apply_parsed_calibration,comedi_apply_parsed_calibration,0.7.20);
154 int _comedi_apply_parsed_calibration( comedi_t *dev, unsigned int subdev, unsigned int channel,
155 unsigned int range, unsigned int aref, const comedi_calibration_t *calibration )
159 retval = check_cal_file( dev, calibration );
160 if( retval < 0 ) return retval;
162 retval = apply_calibration( dev, calibration, subdev, channel, range, aref );
166 /* munge characters in board name that will cause problems with file paths */
167 static void fixup_board_name( char *name )
169 while( ( name = strchr( name, '/' ) ) )
179 EXPORT_ALIAS_DEFAULT(_comedi_get_default_calibration_path,comedi_get_default_calibration_path,0.7.20);
180 char* _comedi_get_default_calibration_path( comedi_t *dev )
182 struct stat file_stats;
186 const char *driver_name;
188 if( fstat( comedi_fileno( dev ), &file_stats ) < 0 )
190 COMEDILIB_DEBUG( 3, "failed to get file stats of comedi device file\n" );
194 driver_name = comedi_get_driver_name( dev );
195 if( driver_name == NULL )
199 temp = comedi_get_board_name( dev );
204 board_name = strdup( temp );
206 fixup_board_name( board_name );
207 asprintf( &file_path, LOCALSTATEDIR "/lib/comedi/calibrations/%s_%s_comedi%li",
208 driver_name, board_name, ( unsigned long ) minor( file_stats.st_rdev ) );
214 EXPORT_ALIAS_DEFAULT(_comedi_apply_calibration,comedi_apply_calibration,0.7.20);
215 int _comedi_apply_calibration( comedi_t *dev, unsigned int subdev, unsigned int channel,
216 unsigned int range, unsigned int aref, const char *cal_file_path )
218 char file_path[ 1024 ];
220 comedi_calibration_t *parsed_file;
224 strncpy( file_path, cal_file_path, sizeof( file_path ) );
229 temp = comedi_get_default_calibration_path( dev );
230 if( temp == NULL ) return -1;
231 strncpy( file_path, temp, sizeof( file_path ) );
235 parsed_file = comedi_parse_calibration_file( file_path );
236 if( parsed_file == NULL )
238 COMEDILIB_DEBUG( 3, "failed to parse calibration file\n" );
242 retval = comedi_apply_parsed_calibration( dev, subdev, channel, range, aref, parsed_file );
244 comedi_cleanup_calibration( parsed_file );
249 EXPORT_ALIAS_DEFAULT(_comedi_get_hardcal_converter, comedi_get_hardcal_converter, 0.8.0);
250 int _comedi_get_hardcal_converter(
251 comedi_t *dev, unsigned subdevice, unsigned channel, unsigned range,
252 enum comedi_conversion_direction direction,
253 comedi_polynomial_t* polynomial)
255 comedi_range *range_ptr = comedi_get_range(dev, subdevice, channel, range);
256 if(range_ptr == NULL)
260 lsampl_t maxdata = comedi_get_maxdata(dev, subdevice, channel);
265 polynomial->order = 1;
268 case COMEDI_TO_PHYSICAL:
269 polynomial->expansion_origin = 0.;
270 polynomial->coefficients[0] = range_ptr->min;
271 polynomial->coefficients[1] = (range_ptr->max - range_ptr->min) / maxdata;
273 case COMEDI_FROM_PHYSICAL:
274 polynomial->expansion_origin = range_ptr->min;
275 polynomial->coefficients[0] = 0.;
276 polynomial->coefficients[1] = maxdata / (range_ptr->max - range_ptr->min);
282 EXPORT_ALIAS_DEFAULT(_comedi_get_softcal_converter, comedi_get_softcal_converter, 0.8.0);
283 int _comedi_get_softcal_converter(
284 unsigned subdevice, unsigned channel, unsigned range,
285 enum comedi_conversion_direction direction,
286 const comedi_calibration_t *calibration, comedi_polynomial_t* polynomial)
290 for(i = 0; i < calibration->num_settings; ++i)
292 if(calibration->settings[i].subdevice != subdevice) continue;
293 if(valid_channel(calibration, i, channel) == 0) continue;
294 if(valid_range(calibration, i, range) == 0) continue;
297 case COMEDI_TO_PHYSICAL:
298 if(calibration->settings[i].soft_calibration.to_phys == NULL)
302 *polynomial = *calibration->settings[i].soft_calibration.to_phys;
304 case COMEDI_FROM_PHYSICAL:
305 if(calibration->settings[i].soft_calibration.from_phys == NULL)
309 *polynomial = *calibration->settings[i].soft_calibration.from_phys;
317 static double apply_polynomial(const comedi_polynomial_t *polynomial, double input)
322 assert(polynomial->order < COMEDI_MAX_NUM_POLYNOMIAL_COEFFICIENTS);
323 for(i = 0; i <= polynomial->order; ++i)
325 value += polynomial->coefficients[i] * term;
326 term *= input - polynomial->expansion_origin;
331 EXPORT_ALIAS_DEFAULT(_comedi_to_physical, comedi_to_physical, 0.8.0);
332 double _comedi_to_physical(lsampl_t data,
333 const comedi_polynomial_t *conversion_polynomial)
335 return apply_polynomial(conversion_polynomial, data);
338 EXPORT_ALIAS_DEFAULT(_comedi_from_physical, comedi_from_physical, 0.8.0);
339 lsampl_t _comedi_from_physical(double data,
340 const comedi_polynomial_t *conversion_polynomial)
342 return nearbyint(apply_polynomial(conversion_polynomial, data));