libsigrok  0.4.0
sigrok hardware access and backend library
hwdriver.c
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1 /*
2  * This file is part of the libsigrok project.
3  *
4  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
5  *
6  * This program is free software: you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation, either version 3 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program. If not, see <http://www.gnu.org/licenses/>.
18  */
19 
20 #include <config.h>
21 #include <stdlib.h>
22 #include <stdio.h>
23 #include <sys/types.h>
24 #include <dirent.h>
25 #include <string.h>
26 #include <glib.h>
27 #include <libsigrok/libsigrok.h>
28 #include "libsigrok-internal.h"
29 
30 /** @cond PRIVATE */
31 #define LOG_PREFIX "hwdriver"
32 /** @endcond */
33 
34 /**
35  * @file
36  *
37  * Hardware driver handling in libsigrok.
38  */
39 
40 /**
41  * @defgroup grp_driver Hardware drivers
42  *
43  * Hardware driver handling in libsigrok.
44  *
45  * @{
46  */
47 
48 /* Please use the same order/grouping as in enum sr_configkey (libsigrok.h). */
49 static struct sr_key_info sr_key_info_config[] = {
50  /* Device classes */
51  {SR_CONF_LOGIC_ANALYZER, SR_T_STRING, NULL, "Logic analyzer", NULL},
52  {SR_CONF_OSCILLOSCOPE, SR_T_STRING, NULL, "Oscilloscope", NULL},
53  {SR_CONF_MULTIMETER, SR_T_STRING, NULL, "Multimeter", NULL},
54  {SR_CONF_DEMO_DEV, SR_T_STRING, NULL, "Demo device", NULL},
55  {SR_CONF_SOUNDLEVELMETER, SR_T_STRING, NULL, "Sound level meter", NULL},
56  {SR_CONF_THERMOMETER, SR_T_STRING, NULL, "Thermometer", NULL},
57  {SR_CONF_HYGROMETER, SR_T_STRING, NULL, "Hygrometer", NULL},
58  {SR_CONF_ENERGYMETER, SR_T_STRING, NULL, "Energy meter", NULL},
59  {SR_CONF_DEMODULATOR, SR_T_STRING, NULL, "Demodulator", NULL},
60  {SR_CONF_POWER_SUPPLY, SR_T_STRING, NULL, "Power supply", NULL},
61  {SR_CONF_LCRMETER, SR_T_STRING, NULL, "LCR meter", NULL},
62  {SR_CONF_ELECTRONIC_LOAD, SR_T_STRING, NULL, "Electronic load", NULL},
63  {SR_CONF_SCALE, SR_T_STRING, NULL, "Scale", NULL},
64 
65  /* Driver scan options */
66  {SR_CONF_CONN, SR_T_STRING, "conn",
67  "Connection", NULL},
68  {SR_CONF_SERIALCOMM, SR_T_STRING, "serialcomm",
69  "Serial communication", NULL},
70  {SR_CONF_MODBUSADDR, SR_T_UINT64, "modbusaddr",
71  "Modbus slave address", NULL},
72 
73  /* Device (or channel group) configuration */
74  {SR_CONF_SAMPLERATE, SR_T_UINT64, "samplerate",
75  "Sample rate", NULL},
76  {SR_CONF_CAPTURE_RATIO, SR_T_UINT64, "captureratio",
77  "Pre-trigger capture ratio", NULL},
78  {SR_CONF_PATTERN_MODE, SR_T_STRING, "pattern",
79  "Pattern", NULL},
80  {SR_CONF_RLE, SR_T_BOOL, "rle",
81  "Run length encoding", NULL},
82  {SR_CONF_TRIGGER_SLOPE, SR_T_STRING, "triggerslope",
83  "Trigger slope", NULL},
84  {SR_CONF_AVERAGING, SR_T_BOOL, "averaging",
85  "Averaging", NULL},
86  {SR_CONF_AVG_SAMPLES, SR_T_UINT64, "avg_samples",
87  "Number of samples to average over", NULL},
88  {SR_CONF_TRIGGER_SOURCE, SR_T_STRING, "triggersource",
89  "Trigger source", NULL},
90  {SR_CONF_HORIZ_TRIGGERPOS, SR_T_FLOAT, "horiz_triggerpos",
91  "Horizontal trigger position", NULL},
92  {SR_CONF_BUFFERSIZE, SR_T_UINT64, "buffersize",
93  "Buffer size", NULL},
95  "Time base", NULL},
96  {SR_CONF_FILTER, SR_T_BOOL, "filter",
97  "Filter", NULL},
99  "Volts/div", NULL},
100  {SR_CONF_COUPLING, SR_T_STRING, "coupling",
101  "Coupling", NULL},
102  {SR_CONF_TRIGGER_MATCH, SR_T_INT32, "triggermatch",
103  "Trigger matches", NULL},
104  {SR_CONF_SAMPLE_INTERVAL, SR_T_UINT64, "sample_interval",
105  "Sample interval", NULL},
106  {SR_CONF_NUM_HDIV, SR_T_INT32, "num_hdiv",
107  "Number of horizontal divisions", NULL},
108  {SR_CONF_NUM_VDIV, SR_T_INT32, "num_vdiv",
109  "Number of vertical divisions", NULL},
110  {SR_CONF_SPL_WEIGHT_FREQ, SR_T_STRING, "spl_weight_freq",
111  "Sound pressure level frequency weighting", NULL},
112  {SR_CONF_SPL_WEIGHT_TIME, SR_T_STRING, "spl_weight_time",
113  "Sound pressure level time weighting", NULL},
115  "Sound pressure level measurement range", NULL},
116  {SR_CONF_HOLD_MAX, SR_T_BOOL, "hold_max",
117  "Hold max", NULL},
118  {SR_CONF_HOLD_MIN, SR_T_BOOL, "hold_min",
119  "Hold min", NULL},
120  {SR_CONF_VOLTAGE_THRESHOLD, SR_T_DOUBLE_RANGE, "voltage_threshold",
121  "Voltage threshold", NULL },
122  {SR_CONF_EXTERNAL_CLOCK, SR_T_BOOL, "external_clock",
123  "External clock mode", NULL},
124  {SR_CONF_SWAP, SR_T_BOOL, "swap",
125  "Swap channel order", NULL},
126  {SR_CONF_CENTER_FREQUENCY, SR_T_UINT64, "center_frequency",
127  "Center frequency", NULL},
128  {SR_CONF_NUM_LOGIC_CHANNELS, SR_T_INT32, "logic_channels",
129  "Number of logic channels", NULL},
130  {SR_CONF_NUM_ANALOG_CHANNELS, SR_T_INT32, "analog_channels",
131  "Number of analog channels", NULL},
132  {SR_CONF_VOLTAGE, SR_T_FLOAT, "voltage",
133  "Current voltage", NULL},
134  {SR_CONF_VOLTAGE_TARGET, SR_T_FLOAT, "voltage_target",
135  "Voltage target", NULL},
136  {SR_CONF_CURRENT, SR_T_FLOAT, "current",
137  "Current current", NULL},
138  {SR_CONF_CURRENT_LIMIT, SR_T_FLOAT, "current_limit",
139  "Current limit", NULL},
140  {SR_CONF_ENABLED, SR_T_BOOL, "enabled",
141  "Channel enabled", NULL},
142  {SR_CONF_CHANNEL_CONFIG, SR_T_STRING, "channel_config",
143  "Channel modes", NULL},
145  "Over-voltage protection enabled", NULL},
147  "Over-voltage protection active", NULL},
149  "Over-voltage protection threshold", NULL},
151  "Over-current protection enabled", NULL},
153  "Over-current protection active", NULL},
155  "Over-current protection threshold", NULL},
156  {SR_CONF_CLOCK_EDGE, SR_T_STRING, "clock_edge",
157  "Clock edge", NULL},
158  {SR_CONF_AMPLITUDE, SR_T_FLOAT, "amplitude",
159  "Amplitude", NULL},
160  {SR_CONF_REGULATION, SR_T_STRING, "regulation",
161  "Channel regulation", NULL},
163  "Over-temperature protection", NULL},
164  {SR_CONF_OUTPUT_FREQUENCY, SR_T_FLOAT, "output_frequency",
165  "Output frequency", NULL},
166  {SR_CONF_OUTPUT_FREQUENCY_TARGET, SR_T_FLOAT, "output_frequency_target",
167  "Output frequency target", NULL},
168  {SR_CONF_MEASURED_QUANTITY, SR_T_MQ, "measured_quantity",
169  "Measured quantity", NULL},
170  {SR_CONF_EQUIV_CIRCUIT_MODEL, SR_T_STRING, "equiv_circuit_model",
171  "Equivalent circuit model", NULL},
173  "Over-temperature protection active", NULL},
174 
175  /* Special stuff */
176  {SR_CONF_SESSIONFILE, SR_T_STRING, "sessionfile",
177  "Session file", NULL},
178  {SR_CONF_CAPTUREFILE, SR_T_STRING, "capturefile",
179  "Capture file", NULL},
180  {SR_CONF_CAPTURE_UNITSIZE, SR_T_UINT64, "capture_unitsize",
181  "Capture unitsize", NULL},
182  {SR_CONF_POWER_OFF, SR_T_BOOL, "power_off",
183  "Power off", NULL},
184  {SR_CONF_DATA_SOURCE, SR_T_STRING, "data_source",
185  "Data source", NULL},
186  {SR_CONF_PROBE_FACTOR, SR_T_UINT64, "probe_factor",
187  "Probe factor", NULL},
188 
189  /* Acquisition modes, sample limiting */
190  {SR_CONF_LIMIT_MSEC, SR_T_UINT64, "limit_time",
191  "Time limit", NULL},
192  {SR_CONF_LIMIT_SAMPLES, SR_T_UINT64, "limit_samples",
193  "Sample limit", NULL},
194  {SR_CONF_LIMIT_FRAMES, SR_T_UINT64, "limit_frames",
195  "Frame limit", NULL},
196  {SR_CONF_CONTINUOUS, SR_T_UINT64, "continuous",
197  "Continuous sampling", NULL},
198  {SR_CONF_DATALOG, SR_T_BOOL, "datalog",
199  "Datalog", NULL},
200  {SR_CONF_DEVICE_MODE, SR_T_STRING, "device_mode",
201  "Device mode", NULL},
202  {SR_CONF_TEST_MODE, SR_T_STRING, "test_mode",
203  "Test mode", NULL},
204 
205  ALL_ZERO
206 };
207 
208 /* Please use the same order as in enum sr_mq (libsigrok.h). */
209 static struct sr_key_info sr_key_info_mq[] = {
210  {SR_MQ_VOLTAGE, 0, "voltage", "Voltage", NULL},
211  {SR_MQ_CURRENT, 0, "current", "Current", NULL},
212  {SR_MQ_RESISTANCE, 0, "resistance", "Resistance", NULL},
213  {SR_MQ_CAPACITANCE, 0, "capacitance", "Capacitance", NULL},
214  {SR_MQ_TEMPERATURE, 0, "temperature", "Temperature", NULL},
215  {SR_MQ_FREQUENCY, 0, "frequency", "Frequency", NULL},
216  {SR_MQ_DUTY_CYCLE, 0, "duty_cycle", "Duty cycle", NULL},
217  {SR_MQ_CONTINUITY, 0, "continuity", "Continuity", NULL},
218  {SR_MQ_PULSE_WIDTH, 0, "pulse_width", "Pulse width", NULL},
219  {SR_MQ_CONDUCTANCE, 0, "conductance", "Conductance", NULL},
220  {SR_MQ_POWER, 0, "power", "Power", NULL},
221  {SR_MQ_GAIN, 0, "gain", "Gain", NULL},
222  {SR_MQ_SOUND_PRESSURE_LEVEL, 0, "spl", "Sound pressure level", NULL},
223  {SR_MQ_CARBON_MONOXIDE, 0, "co", "Carbon monoxide", NULL},
224  {SR_MQ_RELATIVE_HUMIDITY, 0, "rh", "Relative humidity", NULL},
225  {SR_MQ_TIME, 0, "time", "Time", NULL},
226  {SR_MQ_WIND_SPEED, 0, "wind_speed", "Wind speed", NULL},
227  {SR_MQ_PRESSURE, 0, "pressure", "Pressure", NULL},
228  {SR_MQ_PARALLEL_INDUCTANCE, 0, "parallel_inductance", "Parallel inductance", NULL},
229  {SR_MQ_PARALLEL_CAPACITANCE, 0, "parallel_capacitance", "Parallel capacitance", NULL},
230  {SR_MQ_PARALLEL_RESISTANCE, 0, "parallel_resistance", "Parallel resistance", NULL},
231  {SR_MQ_SERIES_INDUCTANCE, 0, "series_inductance", "Series inductance", NULL},
232  {SR_MQ_SERIES_CAPACITANCE, 0, "series_capacitance", "Series capacitance", NULL},
233  {SR_MQ_SERIES_RESISTANCE, 0, "series_resistance", "Series resistance", NULL},
234  {SR_MQ_DISSIPATION_FACTOR, 0, "dissipation_factor", "Dissipation factor", NULL},
235  {SR_MQ_QUALITY_FACTOR, 0, "quality_factor", "Quality factor", NULL},
236  {SR_MQ_PHASE_ANGLE, 0, "phase_angle", "Phase angle", NULL},
237  {SR_MQ_DIFFERENCE, 0, "difference", "Difference", NULL},
238  {SR_MQ_COUNT, 0, "count", "Count", NULL},
239  {SR_MQ_POWER_FACTOR, 0, "power_factor", "Power factor", NULL},
240  {SR_MQ_APPARENT_POWER, 0, "apparent_power", "Apparent power", NULL},
241  {SR_MQ_MASS, 0, "mass", "Mass", NULL},
242  ALL_ZERO
243 };
244 
245 /* Please use the same order as in enum sr_mqflag (libsigrok.h). */
246 static struct sr_key_info sr_key_info_mqflag[] = {
247  {SR_MQFLAG_AC, 0, "ac", "AC", NULL},
248  {SR_MQFLAG_DC, 0, "dc", "DC", NULL},
249  {SR_MQFLAG_RMS, 0, "rms", "RMS", NULL},
250  {SR_MQFLAG_DIODE, 0, "diode", "Diode", NULL},
251  {SR_MQFLAG_HOLD, 0, "hold", "Hold", NULL},
252  {SR_MQFLAG_MAX, 0, "max", "Max", NULL},
253  {SR_MQFLAG_MIN, 0, "min", "Min", NULL},
254  {SR_MQFLAG_AUTORANGE, 0, "auto_range", "Auto range", NULL},
255  {SR_MQFLAG_RELATIVE, 0, "relative", "Relative", NULL},
256  {SR_MQFLAG_SPL_FREQ_WEIGHT_A, 0, "spl_freq_weight_a",
257  "Frequency weighted (A)", NULL},
258  {SR_MQFLAG_SPL_FREQ_WEIGHT_C, 0, "spl_freq_weight_c",
259  "Frequency weighted (C)", NULL},
260  {SR_MQFLAG_SPL_FREQ_WEIGHT_Z, 0, "spl_freq_weight_z",
261  "Frequency weighted (Z)", NULL},
262  {SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT, 0, "spl_freq_weight_flat",
263  "Frequency weighted (flat)", NULL},
264  {SR_MQFLAG_SPL_TIME_WEIGHT_S, 0, "spl_time_weight_s",
265  "Time weighted (S)", NULL},
266  {SR_MQFLAG_SPL_TIME_WEIGHT_F, 0, "spl_time_weight_f",
267  "Time weighted (F)", NULL},
268  {SR_MQFLAG_SPL_LAT, 0, "spl_time_average", "Time-averaged (LEQ)", NULL},
269  {SR_MQFLAG_SPL_PCT_OVER_ALARM, 0, "spl_pct_over_alarm",
270  "Percentage over alarm", NULL},
271  {SR_MQFLAG_DURATION, 0, "duration", "Duration", NULL},
272  {SR_MQFLAG_AVG, 0, "average", "Average", NULL},
273  {SR_MQFLAG_REFERENCE, 0, "reference", "Reference", NULL},
274  {SR_MQFLAG_UNSTABLE, 0, "unstable", "Unstable", NULL},
275  ALL_ZERO
276 };
277 
278 /* This must handle all the keys from enum sr_datatype (libsigrok.h). */
279 SR_PRIV const GVariantType *sr_variant_type_get(int datatype)
280 {
281  switch (datatype) {
282  case SR_T_INT32:
283  return G_VARIANT_TYPE_INT32;
284  case SR_T_UINT64:
285  return G_VARIANT_TYPE_UINT64;
286  case SR_T_STRING:
287  return G_VARIANT_TYPE_STRING;
288  case SR_T_BOOL:
289  return G_VARIANT_TYPE_BOOLEAN;
290  case SR_T_FLOAT:
291  return G_VARIANT_TYPE_DOUBLE;
293  case SR_T_RATIONAL_VOLT:
294  case SR_T_UINT64_RANGE:
295  case SR_T_DOUBLE_RANGE:
296  return G_VARIANT_TYPE_TUPLE;
297  case SR_T_KEYVALUE:
298  return G_VARIANT_TYPE_DICTIONARY;
299  case SR_T_MQ:
300  return G_VARIANT_TYPE_TUPLE;
301  default:
302  return NULL;
303  }
304 }
305 
306 SR_PRIV int sr_variant_type_check(uint32_t key, GVariant *value)
307 {
308  const struct sr_key_info *info;
309  const GVariantType *type, *expected;
310  char *expected_string, *type_string;
311 
312  info = sr_key_info_get(SR_KEY_CONFIG, key);
313  if (!info)
314  return SR_OK;
315 
316  expected = sr_variant_type_get(info->datatype);
317  type = g_variant_get_type(value);
318  if (!g_variant_type_equal(type, expected)
319  && !g_variant_type_is_subtype_of(type, expected)) {
320  expected_string = g_variant_type_dup_string(expected);
321  type_string = g_variant_type_dup_string(type);
322  sr_err("Wrong variant type for key '%s': expected '%s', got '%s'",
323  info->name, expected_string, type_string);
324  g_free(expected_string);
325  g_free(type_string);
326  return SR_ERR_ARG;
327  }
328 
329  return SR_OK;
330 }
331 
332 /**
333  * Return the list of supported hardware drivers.
334  *
335  * @param[in] ctx Pointer to a libsigrok context struct. Must not be NULL.
336  *
337  * @retval NULL The ctx argument was NULL, or there are no supported drivers.
338  * @retval Other Pointer to the NULL-terminated list of hardware drivers.
339  * The user should NOT g_free() this list, sr_exit() will do that.
340  *
341  * @since 0.4.0
342  */
343 SR_API struct sr_dev_driver **sr_driver_list(const struct sr_context *ctx)
344 {
345  if (!ctx)
346  return NULL;
347 
348  return ctx->driver_list;
349 }
350 
351 /**
352  * Initialize a hardware driver.
353  *
354  * This usually involves memory allocations and variable initializations
355  * within the driver, but _not_ scanning for attached devices.
356  * The API call sr_driver_scan() is used for that.
357  *
358  * @param ctx A libsigrok context object allocated by a previous call to
359  * sr_init(). Must not be NULL.
360  * @param driver The driver to initialize. This must be a pointer to one of
361  * the entries returned by sr_driver_list(). Must not be NULL.
362  *
363  * @retval SR_OK Success
364  * @retval SR_ERR_ARG Invalid parameter(s).
365  * @retval SR_ERR_BUG Internal errors.
366  * @retval other Another negative error code upon other errors.
367  *
368  * @since 0.2.0
369  */
370 SR_API int sr_driver_init(struct sr_context *ctx, struct sr_dev_driver *driver)
371 {
372  int ret;
373 
374  if (!ctx) {
375  sr_err("Invalid libsigrok context, can't initialize.");
376  return SR_ERR_ARG;
377  }
378 
379  if (!driver) {
380  sr_err("Invalid driver, can't initialize.");
381  return SR_ERR_ARG;
382  }
383 
384  sr_spew("Initializing driver '%s'.", driver->name);
385  if ((ret = driver->init(driver, ctx)) < 0)
386  sr_err("Failed to initialize the driver: %d.", ret);
387 
388  return ret;
389 }
390 
391 /**
392  * Enumerate scan options supported by this driver.
393  *
394  * Before calling sr_driver_scan_options_list(), the user must have previously
395  * initialized the driver by calling sr_driver_init().
396  *
397  * @param driver The driver to enumerate options for. This must be a pointer
398  * to one of the entries returned by sr_driver_list(). Must not
399  * be NULL.
400  *
401  * @return A GArray * of uint32_t entries, or NULL on invalid arguments. Each
402  * entry is a configuration key that is supported as a scan option.
403  * The array must be freed by the caller using g_array_free().
404  *
405  * @since 0.4.0
406  */
407 SR_API GArray *sr_driver_scan_options_list(const struct sr_dev_driver *driver)
408 {
409  GVariant *gvar;
410  const uint32_t *opts;
411  gsize num_opts;
412  GArray *result;
413 
414  if (sr_config_list(driver, NULL, NULL, SR_CONF_SCAN_OPTIONS, &gvar) != SR_OK)
415  return NULL;
416 
417  opts = g_variant_get_fixed_array(gvar, &num_opts, sizeof(uint32_t));
418 
419  result = g_array_sized_new(FALSE, FALSE, sizeof(uint32_t), num_opts);
420 
421  g_array_insert_vals(result, 0, opts, num_opts);
422 
423  g_variant_unref(gvar);
424 
425  return result;
426 }
427 
428 static int check_options(struct sr_dev_driver *driver, GSList *options,
429  uint32_t optlist_key, struct sr_dev_inst *sdi,
430  struct sr_channel_group *cg)
431 {
432  struct sr_config *src;
433  const struct sr_key_info *srci;
434  GVariant *gvar_opts;
435  GSList *l;
436  const uint32_t *opts;
437  gsize num_opts, i;
438  int ret;
439 
440  if (sr_config_list(driver, sdi, cg, optlist_key, &gvar_opts) != SR_OK) {
441  /* Driver publishes no options for this optlist. */
442  return SR_ERR;
443  }
444 
445  ret = SR_OK;
446  opts = g_variant_get_fixed_array(gvar_opts, &num_opts, sizeof(uint32_t));
447  for (l = options; l; l = l->next) {
448  src = l->data;
449  for (i = 0; i < num_opts; i++) {
450  if (opts[i] == src->key)
451  break;
452  }
453  if (i == num_opts) {
454  if (!(srci = sr_key_info_get(SR_KEY_CONFIG, src->key)))
455  /* Shouldn't happen. */
456  sr_err("Invalid option %d.", src->key);
457  else
458  sr_err("Invalid option '%s'.", srci->id);
459  ret = SR_ERR_ARG;
460  break;
461  }
462  if (sr_variant_type_check(src->key, src->data) != SR_OK) {
463  ret = SR_ERR_ARG;
464  break;
465  }
466  }
467  g_variant_unref(gvar_opts);
468 
469  return ret;
470 }
471 
472 /**
473  * Tell a hardware driver to scan for devices.
474  *
475  * In addition to the detection, the devices that are found are also
476  * initialized automatically. On some devices, this involves a firmware upload,
477  * or other such measures.
478  *
479  * The order in which the system is scanned for devices is not specified. The
480  * caller should not assume or rely on any specific order.
481  *
482  * Before calling sr_driver_scan(), the user must have previously initialized
483  * the driver by calling sr_driver_init().
484  *
485  * @param driver The driver that should scan. This must be a pointer to one of
486  * the entries returned by sr_driver_list(). Must not be NULL.
487  * @param options A list of 'struct sr_hwopt' options to pass to the driver's
488  * scanner. Can be NULL/empty.
489  *
490  * @return A GSList * of 'struct sr_dev_inst', or NULL if no devices were
491  * found (or errors were encountered). This list must be freed by the
492  * caller using g_slist_free(), but without freeing the data pointed
493  * to in the list.
494  *
495  * @since 0.2.0
496  */
497 SR_API GSList *sr_driver_scan(struct sr_dev_driver *driver, GSList *options)
498 {
499  GSList *l;
500 
501  if (!driver) {
502  sr_err("Invalid driver, can't scan for devices.");
503  return NULL;
504  }
505 
506  if (!driver->context) {
507  sr_err("Driver not initialized, can't scan for devices.");
508  return NULL;
509  }
510 
511  if (options) {
512  if (check_options(driver, options, SR_CONF_SCAN_OPTIONS, NULL, NULL) != SR_OK)
513  return NULL;
514  }
515 
516  l = driver->scan(driver, options);
517 
518  sr_spew("Scan of '%s' found %d devices.", driver->name,
519  g_slist_length(l));
520 
521  return l;
522 }
523 
524 /**
525  * Call driver cleanup function for all drivers.
526  *
527  * @param[in] ctx Pointer to a libsigrok context struct. Must not be NULL.
528  *
529  * @private
530  */
531 SR_PRIV void sr_hw_cleanup_all(const struct sr_context *ctx)
532 {
533  int i;
534  struct sr_dev_driver **drivers;
535 
536  if (!ctx)
537  return;
538 
539  drivers = sr_driver_list(ctx);
540  for (i = 0; drivers[i]; i++) {
541  if (drivers[i]->cleanup)
542  drivers[i]->cleanup(drivers[i]);
543  drivers[i]->context = NULL;
544  }
545 }
546 
547 /** Allocate struct sr_config.
548  * A floating reference can be passed in for data.
549  * @private
550  */
551 SR_PRIV struct sr_config *sr_config_new(uint32_t key, GVariant *data)
552 {
553  struct sr_config *src;
554 
555  src = g_malloc0(sizeof(struct sr_config));
556  src->key = key;
557  src->data = g_variant_ref_sink(data);
558 
559  return src;
560 }
561 
562 /** Free struct sr_config.
563  * @private
564  */
565 SR_PRIV void sr_config_free(struct sr_config *src)
566 {
567 
568  if (!src || !src->data) {
569  sr_err("%s: invalid data!", __func__);
570  return;
571  }
572 
573  g_variant_unref(src->data);
574  g_free(src);
575 
576 }
577 
578 static void log_key(const struct sr_dev_inst *sdi,
579  const struct sr_channel_group *cg, uint32_t key, int op, GVariant *data)
580 {
581  const char *opstr;
582  const struct sr_key_info *srci;
583 
584  /* Don't log SR_CONF_DEVICE_OPTIONS, it's verbose and not too useful. */
585  if (key == SR_CONF_DEVICE_OPTIONS)
586  return;
587 
588  opstr = op == SR_CONF_GET ? "get" : op == SR_CONF_SET ? "set" : "list";
589  srci = sr_key_info_get(SR_KEY_CONFIG, key);
590 
591  sr_spew("sr_config_%s(): key %d (%s) sdi %p cg %s -> %s", opstr, key,
592  srci ? srci->id : "NULL", sdi, cg ? cg->name : "NULL",
593  data ? g_variant_print(data, TRUE) : "NULL");
594 }
595 
596 static int check_key(const struct sr_dev_driver *driver,
597  const struct sr_dev_inst *sdi, const struct sr_channel_group *cg,
598  uint32_t key, int op, GVariant *data)
599 {
600  const struct sr_key_info *srci;
601  gsize num_opts, i;
602  GVariant *gvar_opts;
603  const uint32_t *opts;
604  uint32_t pub_opt;
605  const char *suffix;
606  const char *opstr;
607 
608  if (sdi && cg)
609  suffix = " for this device and channel group";
610  else if (sdi)
611  suffix = " for this device";
612  else
613  suffix = "";
614 
615  if (!(srci = sr_key_info_get(SR_KEY_CONFIG, key))) {
616  sr_err("Invalid key %d.", key);
617  return SR_ERR_ARG;
618  }
619  opstr = op == SR_CONF_GET ? "get" : op == SR_CONF_SET ? "set" : "list";
620 
621  switch (key) {
622  case SR_CONF_LIMIT_MSEC:
624  case SR_CONF_SAMPLERATE:
625  /* Setting any of these to 0 is not useful. */
626  if (op != SR_CONF_SET || !data)
627  break;
628  if (g_variant_get_uint64(data) == 0) {
629  sr_err("Cannot set '%s' to 0.", srci->id);
630  return SR_ERR_ARG;
631  }
632  break;
633  }
634 
635  if (sr_config_list(driver, sdi, cg, SR_CONF_DEVICE_OPTIONS, &gvar_opts) != SR_OK) {
636  /* Driver publishes no options. */
637  sr_err("No options available%s.", suffix);
638  return SR_ERR_ARG;
639  }
640  opts = g_variant_get_fixed_array(gvar_opts, &num_opts, sizeof(uint32_t));
641  pub_opt = 0;
642  for (i = 0; i < num_opts; i++) {
643  if ((opts[i] & SR_CONF_MASK) == key) {
644  pub_opt = opts[i];
645  break;
646  }
647  }
648  g_variant_unref(gvar_opts);
649  if (!pub_opt) {
650  sr_err("Option '%s' not available%s.", srci->id, suffix);
651  return SR_ERR_ARG;
652  }
653 
654  if (!(pub_opt & op)) {
655  sr_err("Option '%s' not available to %s%s.", srci->id, opstr, suffix);
656  return SR_ERR_ARG;
657  }
658 
659  return SR_OK;
660 }
661 
662 /**
663  * Query value of a configuration key at the given driver or device instance.
664  *
665  * @param[in] driver The sr_dev_driver struct to query.
666  * @param[in] sdi (optional) If the key is specific to a device, this must
667  * contain a pointer to the struct sr_dev_inst to be checked.
668  * Otherwise it must be NULL.
669  * @param[in] cg The channel group on the device for which to list the
670  * values, or NULL.
671  * @param[in] key The configuration key (SR_CONF_*).
672  * @param[in,out] data Pointer to a GVariant where the value will be stored.
673  * Must not be NULL. The caller is given ownership of the GVariant
674  * and must thus decrease the refcount after use. However if
675  * this function returns an error code, the field should be
676  * considered unused, and should not be unreferenced.
677  *
678  * @retval SR_OK Success.
679  * @retval SR_ERR Error.
680  * @retval SR_ERR_ARG The driver doesn't know that key, but this is not to be
681  * interpreted as an error by the caller; merely as an indication
682  * that it's not applicable.
683  *
684  * @since 0.3.0
685  */
686 SR_API int sr_config_get(const struct sr_dev_driver *driver,
687  const struct sr_dev_inst *sdi,
688  const struct sr_channel_group *cg,
689  uint32_t key, GVariant **data)
690 {
691  int ret;
692 
693  if (!driver || !data)
694  return SR_ERR;
695 
696  if (!driver->config_get)
697  return SR_ERR_ARG;
698 
699  if (check_key(driver, sdi, cg, key, SR_CONF_GET, NULL) != SR_OK)
700  return SR_ERR_ARG;
701 
702  if ((ret = driver->config_get(key, data, sdi, cg)) == SR_OK) {
703  log_key(sdi, cg, key, SR_CONF_GET, *data);
704  /* Got a floating reference from the driver. Sink it here,
705  * caller will need to unref when done with it. */
706  g_variant_ref_sink(*data);
707  }
708 
709  return ret;
710 }
711 
712 /**
713  * Set value of a configuration key in a device instance.
714  *
715  * @param[in] sdi The device instance.
716  * @param[in] cg The channel group on the device for which to list the
717  * values, or NULL.
718  * @param[in] key The configuration key (SR_CONF_*).
719  * @param data The new value for the key, as a GVariant with GVariantType
720  * appropriate to that key. A floating reference can be passed
721  * in; its refcount will be sunk and unreferenced after use.
722  *
723  * @retval SR_OK Success.
724  * @retval SR_ERR Error.
725  * @retval SR_ERR_ARG The driver doesn't know that key, but this is not to be
726  * interpreted as an error by the caller; merely as an indication
727  * that it's not applicable.
728  *
729  * @since 0.3.0
730  */
731 SR_API int sr_config_set(const struct sr_dev_inst *sdi,
732  const struct sr_channel_group *cg,
733  uint32_t key, GVariant *data)
734 {
735  int ret;
736 
737  g_variant_ref_sink(data);
738 
739  if (!sdi || !sdi->driver || !data)
740  ret = SR_ERR;
741  else if (!sdi->driver->config_set)
742  ret = SR_ERR_ARG;
743  else if (check_key(sdi->driver, sdi, cg, key, SR_CONF_SET, data) != SR_OK)
744  return SR_ERR_ARG;
745  else if ((ret = sr_variant_type_check(key, data)) == SR_OK) {
746  log_key(sdi, cg, key, SR_CONF_SET, data);
747  ret = sdi->driver->config_set(key, data, sdi, cg);
748  }
749 
750  g_variant_unref(data);
751 
752  return ret;
753 }
754 
755 /**
756  * Apply configuration settings to the device hardware.
757  *
758  * @param sdi The device instance.
759  *
760  * @return SR_OK upon success or SR_ERR in case of error.
761  *
762  * @since 0.3.0
763  */
764 SR_API int sr_config_commit(const struct sr_dev_inst *sdi)
765 {
766  int ret;
767 
768  if (!sdi || !sdi->driver)
769  ret = SR_ERR;
770  else if (!sdi->driver->config_commit)
771  ret = SR_OK;
772  else
773  ret = sdi->driver->config_commit(sdi);
774 
775  return ret;
776 }
777 
778 /**
779  * List all possible values for a configuration key.
780  *
781  * @param[in] driver The sr_dev_driver struct to query.
782  * @param[in] sdi (optional) If the key is specific to a device, this must
783  * contain a pointer to the struct sr_dev_inst to be checked.
784  * @param[in] cg The channel group on the device for which to list the
785  * values, or NULL.
786  * @param[in] key The configuration key (SR_CONF_*).
787  * @param[in,out] data A pointer to a GVariant where the list will be stored.
788  * The caller is given ownership of the GVariant and must thus
789  * unref the GVariant after use. However if this function
790  * returns an error code, the field should be considered
791  * unused, and should not be unreferenced.
792  *
793  * @retval SR_OK Success.
794  * @retval SR_ERR Error.
795  * @retval SR_ERR_ARG The driver doesn't know that key, but this is not to be
796  * interpreted as an error by the caller; merely as an indication
797  * that it's not applicable.
798  *
799  * @since 0.3.0
800  */
801 SR_API int sr_config_list(const struct sr_dev_driver *driver,
802  const struct sr_dev_inst *sdi,
803  const struct sr_channel_group *cg,
804  uint32_t key, GVariant **data)
805 {
806  int ret;
807 
808  if (!driver || !data)
809  return SR_ERR;
810  else if (!driver->config_list)
811  return SR_ERR_ARG;
812  else if (key != SR_CONF_SCAN_OPTIONS && key != SR_CONF_DEVICE_OPTIONS) {
813  if (check_key(driver, sdi, cg, key, SR_CONF_LIST, NULL) != SR_OK)
814  return SR_ERR_ARG;
815  }
816  if ((ret = driver->config_list(key, data, sdi, cg)) == SR_OK) {
817  log_key(sdi, cg, key, SR_CONF_LIST, *data);
818  g_variant_ref_sink(*data);
819  }
820 
821  return ret;
822 }
823 
824 static struct sr_key_info *get_keytable(int keytype)
825 {
826  struct sr_key_info *table;
827 
828  switch (keytype) {
829  case SR_KEY_CONFIG:
830  table = sr_key_info_config;
831  break;
832  case SR_KEY_MQ:
833  table = sr_key_info_mq;
834  break;
835  case SR_KEY_MQFLAGS:
836  table = sr_key_info_mqflag;
837  break;
838  default:
839  sr_err("Invalid keytype %d", keytype);
840  return NULL;
841  }
842 
843  return table;
844 }
845 
846 /**
847  * Get information about a key, by key.
848  *
849  * @param[in] keytype The namespace the key is in.
850  * @param[in] key The key to find.
851  *
852  * @return A pointer to a struct sr_key_info, or NULL if the key
853  * was not found.
854  *
855  * @since 0.3.0
856  */
857 SR_API const struct sr_key_info *sr_key_info_get(int keytype, uint32_t key)
858 {
859  struct sr_key_info *table;
860  int i;
861 
862  if (!(table = get_keytable(keytype)))
863  return NULL;
864 
865  for (i = 0; table[i].key; i++) {
866  if (table[i].key == key)
867  return &table[i];
868  }
869 
870  return NULL;
871 }
872 
873 /**
874  * Get information about a key, by name.
875  *
876  * @param[in] keytype The namespace the key is in.
877  * @param[in] keyid The key id string.
878  *
879  * @return A pointer to a struct sr_key_info, or NULL if the key
880  * was not found.
881  *
882  * @since 0.2.0
883  */
884 SR_API const struct sr_key_info *sr_key_info_name_get(int keytype, const char *keyid)
885 {
886  struct sr_key_info *table;
887  int i;
888 
889  if (!(table = get_keytable(keytype)))
890  return NULL;
891 
892  for (i = 0; table[i].key; i++) {
893  if (!table[i].id)
894  continue;
895  if (!strcmp(table[i].id, keyid))
896  return &table[i];
897  }
898 
899  return NULL;
900 }
901 
902 /** @} */
Sound pressure level is Z-weighted (i.e.
Definition: libsigrok.h:362
GSList * sr_driver_scan(struct sr_dev_driver *driver, GSList *options)
Tell a hardware driver to scan for devices.
Definition: hwdriver.c:497
Over-temperature protection (OTP)
Definition: libsigrok.h:962
int sr_config_get(const struct sr_dev_driver *driver, const struct sr_dev_inst *sdi, const struct sr_channel_group *cg, uint32_t key, GVariant **data)
Query value of a configuration key at the given driver or device instance.
Definition: hwdriver.c:686
Logic low-high threshold range.
Definition: libsigrok.h:830
char * name
Name of the channel group.
Definition: libsigrok.h:620
Over-voltage protection (OVP) feature.
Definition: libsigrok.h:906
Difference from reference value.
Definition: libsigrok.h:227
Device is in autoranging mode.
Definition: libsigrok.h:351
Over-temperature protection (OTP) active.
Definition: libsigrok.h:977
Value is voltage drop across a diode, or NAN.
Definition: libsigrok.h:343
The public libsigrok header file to be used by frontends.
SR_PRIV const GVariantType * sr_variant_type_get(int datatype)
Definition: hwdriver.c:279
Sound pressure level measurement range.
Definition: libsigrok.h:821
Device driver data.
Definition: libsigrok.h:1090
Electrical power, usually in W, or dBm.
Definition: libsigrok.h:192
Logarithmic representation of sound pressure relative to a reference value.
Definition: libsigrok.h:197
Self test mode.
Definition: libsigrok.h:1049
The device supports specifying a capturefile to inject.
Definition: libsigrok.h:987
Sound pressure level frequency weighting.
Definition: libsigrok.h:815
GSList *(* scan)(struct sr_dev_driver *driver, GSList *options)
Scan for devices.
Definition: libsigrok.h:1109
Voltage measurement is alternating current (AC).
Definition: libsigrok.h:337
The device supports setting a pre/post-trigger capture ratio.
Definition: libsigrok.h:761
Power off the device.
Definition: libsigrok.h:993
Horizontal trigger position.
Definition: libsigrok.h:785
The device supports specifying the capturefile unit size.
Definition: libsigrok.h:990
Trigger matches.
Definition: libsigrok.h:803
Number of horizontal divisions, as related to SR_CONF_TIMEBASE.
Definition: libsigrok.h:809
Trigger source.
Definition: libsigrok.h:782
The device can measure energy consumption.
Definition: libsigrok.h:691
Over-current protection (OCP) active.
Definition: libsigrok.h:938
Choice of clock edge for external clock ("r" or "f").
Definition: libsigrok.h:949
Unstable value (hasn't settled yet).
Definition: libsigrok.h:385
Dissipation factor.
Definition: libsigrok.h:221
Count.
Definition: libsigrok.h:229
The device supports setting its sample interval, in ms.
Definition: libsigrok.h:806
Generic/unspecified error.
Definition: libsigrok.h:68
Output frequency target in Hz.
Definition: libsigrok.h:968
Device is in "hold" mode (repeating the last measurement).
Definition: libsigrok.h:345
Time is duration (as opposed to epoch, ...).
Definition: libsigrok.h:379
The device has internal storage, into which data is logged.
Definition: libsigrok.h:1043
Sound pressure level is A-weighted in the frequency domain, according to IEC 61672:2003.
Definition: libsigrok.h:356
Parallel inductance (LCR meter model).
Definition: libsigrok.h:209
The device supports setting the number of logic channels.
Definition: libsigrok.h:848
The device supports setting the number of analog channels.
Definition: libsigrok.h:851
The device supports setting a sample number limit (how many samples should be acquired).
Definition: libsigrok.h:1026
The device supports run-length encoding (RLE).
Definition: libsigrok.h:767
const char * id
Short, lowercase ID string, e.g.
Definition: libsigrok.h:648
This is a true RMS measurement.
Definition: libsigrok.h:341
The device can act as an LCR meter.
Definition: libsigrok.h:700
Equivalent circuit model.
Definition: libsigrok.h:974
Channel regulation get: "CV", "CC" or "UR", denoting constant voltage, constant current or unregulate...
Definition: libsigrok.h:959
Min hold mode.
Definition: libsigrok.h:827
The device supports continuous sampling.
Definition: libsigrok.h:1039
const char * name
Full capitalized name, e.g.
Definition: libsigrok.h:650
Number of vertical divisions, as related to SR_CONF_VDIV.
Definition: libsigrok.h:812
int sr_config_set(const struct sr_dev_inst *sdi, const struct sr_channel_group *cg, uint32_t key, GVariant *data)
Set value of a configuration key in a device instance.
Definition: hwdriver.c:731
uint32_t key
Config key like SR_CONF_CONN, MQ value like SR_MQ_VOLTAGE, etc.
Definition: libsigrok.h:644
Carbon monoxide level.
Definition: libsigrok.h:199
The device can act as a multimeter.
Definition: libsigrok.h:676
Sound pressure level measurement is F-weighted (125ms) in the time domain.
Definition: libsigrok.h:371
The device supports using an external clock.
Definition: libsigrok.h:833
Structure for groups of channels that have common properties.
Definition: libsigrok.h:618
Channel configuration.
Definition: libsigrok.h:898
#define SR_API
Definition: libsigrok.h:121
No error.
Definition: libsigrok.h:67
Mass.
Definition: libsigrok.h:235
The device can act as logic analyzer.
Definition: libsigrok.h:670
The device can act as a signal demodulator.
Definition: libsigrok.h:694
int(* config_get)(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
Query value of a configuration key in driver or given device instance.
Definition: libsigrok.h:1120
Amplitude of a source without strictly-defined MQ.
Definition: libsigrok.h:952
The device can act as a scale.
Definition: libsigrok.h:706
Continuity test.
Definition: libsigrok.h:188
The device supports setting a sample time limit (how long the sample acquisition should run...
Definition: libsigrok.h:1020
Over-voltage protection (OVP) active.
Definition: libsigrok.h:914
Data source for acquisition.
Definition: libsigrok.h:1007
The device supports averaging.
Definition: libsigrok.h:773
Modbus slave address specification.
Definition: libsigrok.h:751
Over-current protection (OCP) threshold.
Definition: libsigrok.h:946
Sound pressure level is time-averaged (LAT), also known as Equivalent Continuous A-weighted Sound Lev...
Definition: libsigrok.h:374
The device supports swapping channels.
Definition: libsigrok.h:839
Pressure.
Definition: libsigrok.h:207
Buffer size.
Definition: libsigrok.h:788
Sound pressure level is C-weighted in the frequency domain, according to IEC 61672:2003.
Definition: libsigrok.h:359
const char * name
Driver name.
Definition: libsigrok.h:1093
GVariant * data
Key-specific data.
Definition: libsigrok.h:632
Quality factor.
Definition: libsigrok.h:223
Sound pressure level time weighting.
Definition: libsigrok.h:818
Voltage measurement is direct current (DC).
Definition: libsigrok.h:339
The device can act as a sound level meter.
Definition: libsigrok.h:682
Filter.
Definition: libsigrok.h:794
Coupling.
Definition: libsigrok.h:800
The device supports setting trigger slope.
Definition: libsigrok.h:770
The device is a demo device.
Definition: libsigrok.h:679
Device is in "min" mode, only updating upon a new min value.
Definition: libsigrok.h:349
Sound pressure level represented as a percentage of measurements that were over a preset alarm level...
Definition: libsigrok.h:377
const struct sr_key_info * sr_key_info_name_get(int keytype, const char *keyid)
Get information about a key, by name.
Definition: hwdriver.c:884
GArray * sr_driver_scan_options_list(const struct sr_dev_driver *driver)
Enumerate scan options supported by this driver.
Definition: hwdriver.c:407
Output frequency in Hz.
Definition: libsigrok.h:965
Current voltage.
Definition: libsigrok.h:858
SR_PRIV int sr_variant_type_check(uint32_t key, GVariant *value)
Definition: hwdriver.c:306
Specification on how to connect to a device.
Definition: libsigrok.h:722
The device supports setting a pattern (pattern generator mode).
Definition: libsigrok.h:764
Current limit.
Definition: libsigrok.h:881
The device supports setting a probe factor.
Definition: libsigrok.h:1010
The device can act as a programmable power supply.
Definition: libsigrok.h:697
Enabling/disabling channel.
Definition: libsigrok.h:889
Over-voltage protection (OVP) threshold.
Definition: libsigrok.h:922
Time base.
Definition: libsigrok.h:791
Center frequency.
Definition: libsigrok.h:845
Value can be read.
Definition: libsigrok.h:658
Possible values can be enumerated.
Definition: libsigrok.h:662
const struct sr_key_info * sr_key_info_get(int keytype, uint32_t key)
Get information about a key, by key.
Definition: hwdriver.c:857
Wind speed.
Definition: libsigrok.h:205
Time.
Definition: libsigrok.h:203
Parallel resistance (LCR meter model).
Definition: libsigrok.h:213
Series resistance (LCR meter model).
Definition: libsigrok.h:219
int(* cleanup)(const struct sr_dev_driver *driver)
Called before driver is unloaded.
Definition: libsigrok.h:1102
Parallel capacitance (LCR meter model).
Definition: libsigrok.h:211
The device can measure humidity.
Definition: libsigrok.h:688
Device is in "max" mode, only updating upon a new max value.
Definition: libsigrok.h:347
Device is in relative mode.
Definition: libsigrok.h:353
int sr_driver_init(struct sr_context *ctx, struct sr_dev_driver *driver)
Initialize a hardware driver.
Definition: hwdriver.c:370
The device supports setting a frame limit (how many frames should be acquired).
Definition: libsigrok.h:1032
The device can act as an electronic load.
Definition: libsigrok.h:703
int sr_config_commit(const struct sr_dev_inst *sdi)
Apply configuration settings to the device hardware.
Definition: hwdriver.c:764
The device supports setting its samplerate, in Hz.
Definition: libsigrok.h:758
Value can be written.
Definition: libsigrok.h:660
Current current.
Definition: libsigrok.h:873
Opaque structure representing a libsigrok context.
Session filename.
Definition: libsigrok.h:984
int sr_config_list(const struct sr_dev_driver *driver, const struct sr_dev_inst *sdi, const struct sr_channel_group *cg, uint32_t key, GVariant **data)
List all possible values for a configuration key.
Definition: hwdriver.c:801
int(* init)(struct sr_dev_driver *driver, struct sr_context *sr_ctx)
Called when driver is loaded, e.g.
Definition: libsigrok.h:1099
Phase angle.
Definition: libsigrok.h:225
Maximum target voltage.
Definition: libsigrok.h:866
Reference value shown.
Definition: libsigrok.h:383
Sound pressure level is not weighted in the frequency domain, albeit without standards-defined low an...
Definition: libsigrok.h:365
Device is in "avg" mode, averaging upon each new value.
Definition: libsigrok.h:381
Device mode for multi-function devices.
Definition: libsigrok.h:1046
int datatype
Data type like SR_T_STRING, etc if applicable.
Definition: libsigrok.h:646
The device can measure temperature.
Definition: libsigrok.h:685
void * context
Device driver context, considered private.
Definition: libsigrok.h:1156
Serial communication specification, in the form:
Definition: libsigrok.h:743
Apparent power.
Definition: libsigrok.h:233
struct sr_dev_driver ** sr_driver_list(const struct sr_context *ctx)
Return the list of supported hardware drivers.
Definition: hwdriver.c:343
uint32_t key
Config key like SR_CONF_CONN, etc.
Definition: libsigrok.h:630
The device can act as an oscilloscope.
Definition: libsigrok.h:673
Measured quantity.
Definition: libsigrok.h:971
Information about a key.
Definition: libsigrok.h:642
Series inductance (LCR meter model).
Definition: libsigrok.h:215
Max hold mode.
Definition: libsigrok.h:824
int(* config_list)(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
List all possible values for a configuration key in a device instance.
Definition: libsigrok.h:1138
Series capacitance (LCR meter model).
Definition: libsigrok.h:217
Sound pressure level measurement is S-weighted (1s) in the time domain.
Definition: libsigrok.h:368
Duty cycle, e.g.
Definition: libsigrok.h:186
Gain (a transistor's gain, or hFE, for example).
Definition: libsigrok.h:194
The device supports setting number of samples to be averaged over.
Definition: libsigrok.h:779
#define SR_PRIV
Definition: libsigrok.h:128
Over-current protection (OCP) feature.
Definition: libsigrok.h:930
Power factor.
Definition: libsigrok.h:231
Function argument error.
Definition: libsigrok.h:70
Volts/div.
Definition: libsigrok.h:797
Used for setting or getting value of a config item.
Definition: libsigrok.h:628