3 header file for the comedi library routines
5 COMEDI - Linux Control and Measurement Device Interface
6 Copyright (C) 1998 David A. Schleef <ds@stm.lbl.gov>
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <sys/ioctl.h>
37 typedef struct comedi_t_struct comedi_t;
45 typedef struct comedi_sv_struct{
47 unsigned int subdevice;
54 /* number of measurements to average (for ai) */
63 comedi_t *comedi_open(const char *fn);
64 void comedi_close(comedi_t *it);
66 int comedi_loglevel(int loglevel);
67 void comedi_perror(const char *s);
68 char *comedi_strerror(int errnum);
69 int comedi_errno(void);
70 int comedi_fileno(comedi_t *it);
74 int comedi_get_n_subdevices(comedi_t *it);
75 int comedi_get_version_code(comedi_t *it);
76 char *comedi_get_driver_name(comedi_t *it);
77 char *comedi_get_board_name(comedi_t *it);
79 int comedi_get_subdevice_type(comedi_t *it,unsigned int subdevice);
80 int comedi_find_subdevice_by_type(comedi_t *it,int type,unsigned int subd);
81 int comedi_get_subdevice_flags(comedi_t *it,unsigned int subdevice);
82 int comedi_get_n_channels(comedi_t *it,unsigned int subdevice);
83 lsampl_t comedi_get_maxdata(comedi_t *it,unsigned int subdevice,unsigned int chan);
84 int comedi_get_rangetype(comedi_t *it,unsigned int subdevice,unsigned int chan);
85 comedi_range * comedi_get_range(comedi_t *it,unsigned int subdevice,unsigned int chan,unsigned int range);
86 int comedi_find_range(comedi_t *it,unsigned int subd,unsigned int chan,unsigned int unit,double min,double max);
87 int comedi_get_n_ranges(comedi_t *it,unsigned int subdevice,unsigned int chan);
89 int comedi_range_is_chan_specific(comedi_t *it,unsigned int subdevice);
90 int comedi_maxdata_is_chan_specific(comedi_t *it,unsigned int subdevice);
92 int comedi_get_buffer_size(comedi_t *it,unsigned int subdevice);
93 int comedi_get_max_buffer_size(comedi_t *it,unsigned int subdevice);
94 int comedi_set_buffer_size(comedi_t *it,unsigned int subdevice,unsigned int len);
96 /* triggers and commands */
98 int comedi_cancel(comedi_t *it,unsigned int subdevice);
99 int comedi_trigger(comedi_t *it,comedi_trig *trig);
100 int comedi_command(comedi_t *it,comedi_cmd *cmd);
101 int comedi_command_test(comedi_t *it,comedi_cmd *cmd);
102 int comedi_do_insnlist(comedi_t *it,comedi_insnlist *il);
103 int comedi_do_insn(comedi_t *it,comedi_insn *insn);
104 int comedi_lock(comedi_t *it,unsigned int subdevice);
105 int comedi_unlock(comedi_t *it,unsigned int subdevice);
109 double comedi_to_phys(lsampl_t data,comedi_range *rng,lsampl_t maxdata);
110 lsampl_t comedi_from_phys(double data,comedi_range *rng,lsampl_t maxdata);
112 /* synchronous stuff */
114 int comedi_data_read(comedi_t *it,unsigned int subd,unsigned int chan,unsigned int range,
115 unsigned int aref,lsampl_t *data);
116 int comedi_data_write(comedi_t *it,unsigned int subd,unsigned int chan,unsigned int range,
117 unsigned int aref,lsampl_t data);
119 /* slowly varying stuff */
121 int comedi_sv_init(comedi_sv_t *it,comedi_t *dev,unsigned int subd,unsigned int chan);
122 int comedi_sv_update(comedi_sv_t *it);
123 int comedi_sv_measure(comedi_sv_t *it,double *data);
127 int comedi_dio_config(comedi_t *it,unsigned int subd,unsigned int chan,unsigned int dir);
128 int comedi_dio_read(comedi_t *it,unsigned int subd,unsigned int chan,unsigned int *bit);
129 int comedi_dio_write(comedi_t *it,unsigned int subd,unsigned int chan,unsigned int bit);
130 int comedi_dio_bitfield(comedi_t *it,unsigned int subd,unsigned int write_mask,
133 /* functions related to streaming I/O (commands) */
135 int comedi_get_cmd_src_mask(comedi_t *dev,unsigned int subdevice, comedi_cmd *cmd);
136 int comedi_get_cmd_generic_timed(comedi_t *dev,unsigned int subdevice, comedi_cmd *cmd);
138 int comedi_poll(comedi_t *dev,unsigned int subdevice);
140 /* timer stuff (deprecated) */
142 int comedi_get_timer(comedi_t *it,unsigned int subdev,double freq,unsigned int *trigvar,
143 double *actual_freq);
145 int comedi_timed_1chan(comedi_t *it,unsigned int subdev,unsigned int chan,unsigned int range,
146 unsigned int aref,double freq,unsigned int n_samples,double *data);
150 The following prototypes are ALPHA, indicating that they might change
151 in future releases of comedilib, without regard to backward compatibility.
154 enum comedi_oor_behavior {
155 COMEDI_OOR_NUMBER = 0,
159 enum comedi_oor_behavior comedi_set_global_oor_behavior(enum comedi_oor_behavior behavior);
163 // changes maximum size (in bytes) of preallocated buffer, requires root priviledge, returns new max size
164 int comedi_set_max_buffer_size(comedi_t *it, unsigned int subdev, unsigned int max_size);
165 // returns number of bytes in buffer waiting to be read by user
166 int comedi_get_buffer_contents(comedi_t *it, unsigned int subdev);
167 // marks 'bytes' number of bytes in buffer as read by user, returns number of bytes left to be read
168 int comedi_mark_buffer_read(comedi_t *it, unsigned int subdev, unsigned int bytes);
169 // returns offset in bytes from beginning of buffer for first unread data point in buffer
170 int comedi_get_buffer_offset(comedi_t *it, unsigned int subdev);