[libsigrok.git] / src / analog.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2014 Bert Vermeulen <bert@biot.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <config.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <ctype.h>
#include <libsigrok/libsigrok.h>
#include "libsigrok-internal.h"

/** @cond PRIVATE */
#define LOG_PREFIX "analog"
/** @endcond */

/**
 * @file
 *
 * Handling and converting analog data.
 */

/**
 * @defgroup grp_analog Analog data handling
 *
 * Handling and converting analog data.
 *
 * @{
 */

struct unit_mq_string {
	uint64_t value;
	char *str;
};

/* Please use the same order as in enum sr_unit (libsigrok.h). */
static struct unit_mq_string unit_strings[] = {
	{ SR_UNIT_VOLT, "V" },
	{ SR_UNIT_AMPERE, "A" },
	{ SR_UNIT_OHM, "\xe2\x84\xa6" },
	{ SR_UNIT_FARAD, "F" },
	{ SR_UNIT_KELVIN, "K" },
	{ SR_UNIT_CELSIUS, "\xc2\xb0""C" },
	{ SR_UNIT_FAHRENHEIT, "\xc2\xb0""F" },
	{ SR_UNIT_HERTZ, "Hz" },
	{ SR_UNIT_PERCENTAGE, "%" },
	{ SR_UNIT_BOOLEAN, "" },
	{ SR_UNIT_SECOND, "s" },
	{ SR_UNIT_SIEMENS, "S" },
	{ SR_UNIT_DECIBEL_MW, "dBu" },
	{ SR_UNIT_DECIBEL_VOLT, "dBv" },
	{ SR_UNIT_UNITLESS, "" },
	{ SR_UNIT_DECIBEL_SPL, "dB" },
	{ SR_UNIT_CONCENTRATION, "ppm" },
	{ SR_UNIT_REVOLUTIONS_PER_MINUTE, "RPM" },
	{ SR_UNIT_VOLT_AMPERE, "VA" },
	{ SR_UNIT_WATT, "W" },
	{ SR_UNIT_WATT_HOUR, "Wh" },
	{ SR_UNIT_METER_SECOND, "m/s" },
	{ SR_UNIT_HECTOPASCAL, "hPa" },
	{ SR_UNIT_HUMIDITY_293K, "%rF" },
	{ SR_UNIT_DEGREE, "\xc2\xb0" },
	{ SR_UNIT_HENRY, "H" },
	{ SR_UNIT_GRAM, "g" },
	{ SR_UNIT_CARAT, "ct" },
	{ SR_UNIT_OUNCE, "oz" },
	{ SR_UNIT_TROY_OUNCE, "oz t" },
	{ SR_UNIT_POUND, "lb" },
	{ SR_UNIT_PENNYWEIGHT, "dwt" },
	{ SR_UNIT_GRAIN, "gr" },
	{ SR_UNIT_TAEL, "tael" },
	{ SR_UNIT_MOMME, "momme" },
	{ SR_UNIT_TOLA, "tola" },
	{ SR_UNIT_PIECE, "pcs" },
	ALL_ZERO
};

/* Please use the same order as in enum sr_mqflag (libsigrok.h). */
static struct unit_mq_string mq_strings[] = {
	{ SR_MQFLAG_AC, " AC" },
	{ SR_MQFLAG_DC, " DC" },
	{ SR_MQFLAG_RMS, " RMS" },
	{ SR_MQFLAG_DIODE, " DIODE" },
	{ SR_MQFLAG_HOLD, " HOLD" },
	{ SR_MQFLAG_MAX, " MAX" },
	{ SR_MQFLAG_MIN, " MIN" },
	{ SR_MQFLAG_AUTORANGE, " AUTO" },
	{ SR_MQFLAG_RELATIVE, " REL" },
	{ SR_MQFLAG_SPL_FREQ_WEIGHT_A, "(A)" },
	{ SR_MQFLAG_SPL_FREQ_WEIGHT_C, "(C)" },
	{ SR_MQFLAG_SPL_FREQ_WEIGHT_Z, "(Z)" },
	{ SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT, "(SPL)" },
	{ SR_MQFLAG_SPL_TIME_WEIGHT_S, " S" },
	{ SR_MQFLAG_SPL_TIME_WEIGHT_F, " F" },
	{ SR_MQFLAG_SPL_LAT, " LAT" },
	/* Not a standard function for SLMs, so this is a made-up notation. */
	{ SR_MQFLAG_SPL_PCT_OVER_ALARM, "%oA" },
	{ SR_MQFLAG_DURATION, " DURATION" },
	{ SR_MQFLAG_AVG, " AVG" },
	{ SR_MQFLAG_REFERENCE, " REF" },
	{ SR_MQFLAG_UNSTABLE, " UNSTABLE" },
	ALL_ZERO
};

SR_PRIV int sr_analog_init(struct sr_datafeed_analog2 *analog,
		struct sr_analog_encoding *encoding,
		struct sr_analog_meaning *meaning,
		struct sr_analog_spec *spec,
		int digits)
{
	memset(analog, 0, sizeof(*analog));
	memset(encoding, 0, sizeof(*encoding));
	memset(meaning, 0, sizeof(*meaning));
	memset(spec, 0, sizeof(*spec));

	analog->encoding = encoding;
	analog->meaning = meaning;
	analog->spec = spec;

	encoding->unitsize = sizeof(float);
	encoding->is_float = TRUE;
#ifdef WORDS_BIGENDIAN
	encoding->is_bigendian = TRUE;
#else
	encoding->is_bigendian = FALSE;
#endif
	encoding->digits = digits;
	encoding->is_digits_decimal = TRUE;
	encoding->scale.p = 1;
	encoding->scale.q = 1;
	encoding->offset.p = 0;
	encoding->offset.q = 1;

	spec->spec_digits = digits;

	return SR_OK;
}

SR_API int sr_analog_to_float(const struct sr_datafeed_analog2 *analog,
		float *outbuf)
{
	float offset;
	unsigned int b, i;
	gboolean bigendian;
	unsigned int count = (analog->num_samples
			* g_slist_length(analog->meaning->channels));

#ifdef WORDS_BIGENDIAN
	bigendian = TRUE;
#else
	bigendian = FALSE;
#endif
	if (!analog->encoding->is_float) {
		/* TODO */
		sr_err("Only floating-point encoding supported so far.");
		return SR_ERR;
	}

	if (analog->encoding->unitsize == sizeof(float)
			&& analog->encoding->is_bigendian == bigendian
			&& (analog->encoding->scale.p == analog->encoding->scale.q)
			&& analog->encoding->offset.p / (float)analog->encoding->offset.q == 0) {
		/* The data is already in the right format. */
		memcpy(outbuf, analog->data, count * sizeof(float));
	} else {
		for (i = 0; i < count; i += analog->encoding->unitsize) {
			for (b = 0; b < analog->encoding->unitsize; b++) {
				if (analog->encoding->is_bigendian == bigendian)
					((uint8_t *)outbuf)[i + b] =
						((uint8_t *)analog->data)[i * analog->encoding->unitsize + b];
				else
					((uint8_t *)outbuf)[i + (analog->encoding->unitsize - b)] =
						((uint8_t *)analog->data)[i * analog->encoding->unitsize + b];
			}
			if (analog->encoding->scale.p != analog->encoding->scale.q)
				outbuf[i] = (outbuf[i] * analog->encoding->scale.p) / analog->encoding->scale.q;
			offset = ((float)analog->encoding->offset.p / (float)analog->encoding->offset.q);
			outbuf[i] += offset;
		}
	}

	return SR_OK;
}

/*
 * Convert a floating point value to a string, limited to the given
 * number of decimal digits.
 *
 * @param value The value to convert.
 * @param digits Number of digits after the decimal point to print.
 * @param result Pointer to store result.
 *
 * The string is allocated by the function and must be freed by the caller
 * after use by calling g_free().
 *
 * @retval SR_OK
 *
 * @since 0.4.0
 */
SR_API int sr_analog_float_to_string(float value, int digits, char **result)
{
	int cnt, i;

	/* This produces at least one too many digits */
	*result = g_strdup_printf("%.*f", digits, value);
	for (i = 0, cnt = 0; (*result)[i]; i++) {
		if (isdigit((*result)[i++]))
			cnt++;
		if (cnt == digits) {
			(*result)[i] = 0;
			break;
		}
	}

	return SR_OK;
}

/*
 * Convert the unit/MQ/MQ flags in the analog struct to a string.
 *
 * @param analog Struct containing the unit, MQ and MQ flags.
 * @param result Pointer to store result.
 *
 * The string is allocated by the function and must be freed by the caller
 * after use by calling g_free().
 *
 * @retval SR_OK
 *
 * @since 0.4.0
 */
SR_API int sr_analog_unit_to_string(const struct sr_datafeed_analog2 *analog,
		char **result)
{
	int i;
	GString *buf = g_string_new(NULL);

	for (i = 0; unit_strings[i].value; i++) {
		if (analog->meaning->unit == unit_strings[i].value) {
			g_string_assign(buf, unit_strings[i].str);
			break;
		}
	}

	/* More than one MQ flag may apply. */
	for (i = 0; mq_strings[i].value; i++)
		if (analog->meaning->mqflags & mq_strings[i].value)
			g_string_append(buf, mq_strings[i].str);

	*result = buf->str;
	g_string_free(buf, FALSE);

	return SR_OK;
}

/*
 * Set sr_rational r to the given value.
 *
 * @param p Numerator
 * @param q Denominator
 */
SR_API void sr_rational_set(struct sr_rational *r, int64_t p, uint64_t q)
{
	r->p = p;
	r->q = q;
}

/** @} */
Commit	Line	Data
fb019a0e BV	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2014 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
6ec6c43b	20	#include <config.h>
c2a25ebb BV	21	#include <stdio.h>
c2a25ebb BV	22	#include <stdint.h>
fb019a0e	23	#include <string.h>
c2a25ebb	24	#include <ctype.h>
c1aae900	25	#include <libsigrok/libsigrok.h>
fb019a0e BV	26	#include "libsigrok-internal.h"
fb019a0e BV	27
e00b3f58	28	/** @cond PRIVATE */
fb019a0e	29	#define LOG_PREFIX "analog"
e00b3f58 UH	30	/** @endcond */
	31
	32	/**
	33	* @file
	34	*
	35	* Handling and converting analog data.
	36	*/
	37
	38	/**
	39	* @defgroup grp_analog Analog data handling
	40	*
	41	* Handling and converting analog data.
	42	*
	43	* @{
	44	*/
fb019a0e	45
a5892391 BV	46	struct unit_mq_string {
	47	uint64_t value;
	48	char *str;
	49	};
	50
ca7dbb56	51	/* Please use the same order as in enum sr_unit (libsigrok.h). */
a5892391 BV	52	static struct unit_mq_string unit_strings[] = {
	53	{ SR_UNIT_VOLT, "V" },
	54	{ SR_UNIT_AMPERE, "A" },
	55	{ SR_UNIT_OHM, "\xe2\x84\xa6" },
	56	{ SR_UNIT_FARAD, "F" },
a5892391 BV	57	{ SR_UNIT_KELVIN, "K" },
	58	{ SR_UNIT_CELSIUS, "\xc2\xb0""C" },
	59	{ SR_UNIT_FAHRENHEIT, "\xc2\xb0""F" },
	60	{ SR_UNIT_HERTZ, "Hz" },
	61	{ SR_UNIT_PERCENTAGE, "%" },
f7bcc686	62	{ SR_UNIT_BOOLEAN, "" },
a5892391 BV	63	{ SR_UNIT_SECOND, "s" },
	64	{ SR_UNIT_SIEMENS, "S" },
	65	{ SR_UNIT_DECIBEL_MW, "dBu" },
	66	{ SR_UNIT_DECIBEL_VOLT, "dBv" },
f7bcc686	67	{ SR_UNIT_UNITLESS, "" },
a5892391 BV	68	{ SR_UNIT_DECIBEL_SPL, "dB" },
	69	{ SR_UNIT_CONCENTRATION, "ppm" },
	70	{ SR_UNIT_REVOLUTIONS_PER_MINUTE, "RPM" },
	71	{ SR_UNIT_VOLT_AMPERE, "VA" },
	72	{ SR_UNIT_WATT, "W" },
	73	{ SR_UNIT_WATT_HOUR, "Wh" },
	74	{ SR_UNIT_METER_SECOND, "m/s" },
	75	{ SR_UNIT_HECTOPASCAL, "hPa" },
	76	{ SR_UNIT_HUMIDITY_293K, "%rF" },
	77	{ SR_UNIT_DEGREE, "\xc2\xb0" },
f7bcc686 UH	78	{ SR_UNIT_HENRY, "H" },
	79	{ SR_UNIT_GRAM, "g" },
	80	{ SR_UNIT_CARAT, "ct" },
	81	{ SR_UNIT_OUNCE, "oz" },
	82	{ SR_UNIT_TROY_OUNCE, "oz t" },
	83	{ SR_UNIT_POUND, "lb" },
	84	{ SR_UNIT_PENNYWEIGHT, "dwt" },
	85	{ SR_UNIT_GRAIN, "gr" },
	86	{ SR_UNIT_TAEL, "tael" },
	87	{ SR_UNIT_MOMME, "momme" },
	88	{ SR_UNIT_TOLA, "tola" },
	89	{ SR_UNIT_PIECE, "pcs" },
a5892391 BV	90	ALL_ZERO
	91	};
	92
ca7dbb56	93	/* Please use the same order as in enum sr_mqflag (libsigrok.h). */
a5892391	94	static struct unit_mq_string mq_strings[] = {
a5892391 BV	95	{ SR_MQFLAG_AC, " AC" },
	96	{ SR_MQFLAG_DC, " DC" },
	97	{ SR_MQFLAG_RMS, " RMS" },
	98	{ SR_MQFLAG_DIODE, " DIODE" },
	99	{ SR_MQFLAG_HOLD, " HOLD" },
	100	{ SR_MQFLAG_MAX, " MAX" },
	101	{ SR_MQFLAG_MIN, " MIN" },
	102	{ SR_MQFLAG_AUTORANGE, " AUTO" },
	103	{ SR_MQFLAG_RELATIVE, " REL" },
f7bcc686 UH	104	{ SR_MQFLAG_SPL_FREQ_WEIGHT_A, "(A)" },
	105	{ SR_MQFLAG_SPL_FREQ_WEIGHT_C, "(C)" },
	106	{ SR_MQFLAG_SPL_FREQ_WEIGHT_Z, "(Z)" },
	107	{ SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT, "(SPL)" },
	108	{ SR_MQFLAG_SPL_TIME_WEIGHT_S, " S" },
	109	{ SR_MQFLAG_SPL_TIME_WEIGHT_F, " F" },
	110	{ SR_MQFLAG_SPL_LAT, " LAT" },
	111	/* Not a standard function for SLMs, so this is a made-up notation. */
	112	{ SR_MQFLAG_SPL_PCT_OVER_ALARM, "%oA" },
	113	{ SR_MQFLAG_DURATION, " DURATION" },
a5892391 BV	114	{ SR_MQFLAG_AVG, " AVG" },
a5892391 BV	115	{ SR_MQFLAG_REFERENCE, " REF" },
f7bcc686	116	{ SR_MQFLAG_UNSTABLE, " UNSTABLE" },
a5892391 BV	117	ALL_ZERO
	118	};
	119
41caa319 AJ	120	SR_PRIV int sr_analog_init(struct sr_datafeed_analog2 *analog,
	121	struct sr_analog_encoding *encoding,
	122	struct sr_analog_meaning *meaning,
	123	struct sr_analog_spec *spec,
	124	int digits)
	125	{
	126	memset(analog, 0, sizeof(*analog));
	127	memset(encoding, 0, sizeof(*encoding));
	128	memset(meaning, 0, sizeof(*meaning));
	129	memset(spec, 0, sizeof(*spec));
	130
	131	analog->encoding = encoding;
	132	analog->meaning = meaning;
	133	analog->spec = spec;
	134
	135	encoding->unitsize = sizeof(float);
	136	encoding->is_float = TRUE;
	137	#ifdef WORDS_BIGENDIAN
	138	encoding->is_bigendian = TRUE;
	139	#else
	140	encoding->is_bigendian = FALSE;
	141	#endif
	142	encoding->digits = digits;
	143	encoding->is_digits_decimal = TRUE;
	144	encoding->scale.p = 1;
	145	encoding->scale.q = 1;
	146	encoding->offset.p = 0;
	147	encoding->offset.q = 1;
	148
	149	spec->spec_digits = digits;
	150
	151	return SR_OK;
	152	}
	153
fb019a0e	154	SR_API int sr_analog_to_float(const struct sr_datafeed_analog2 *analog,
4b4fdeea	155	float *outbuf)
fb019a0e BV	156	{
	157	float offset;
	158	unsigned int b, i;
	159	gboolean bigendian;
7d65dd3a ML	160	unsigned int count = (analog->num_samples
7d65dd3a ML	161	* g_slist_length(analog->meaning->channels));
fb019a0e BV	162
	163	#ifdef WORDS_BIGENDIAN
	164	bigendian = TRUE;
	165	#else
	166	bigendian = FALSE;
	167	#endif
	168	if (!analog->encoding->is_float) {
	169	/* TODO */
4b4fdeea	170	sr_err("Only floating-point encoding supported so far.");
fb019a0e BV	171	return SR_ERR;
	172	}
	173
	174	if (analog->encoding->unitsize == sizeof(float)
	175	&& analog->encoding->is_bigendian == bigendian
	176	&& (analog->encoding->scale.p == analog->encoding->scale.q)
4b4fdeea	177	&& analog->encoding->offset.p / (float)analog->encoding->offset.q == 0) {
fb019a0e	178	/* The data is already in the right format. */
7d65dd3a	179	memcpy(outbuf, analog->data, count * sizeof(float));
fb019a0e	180	} else {
7d65dd3a	181	for (i = 0; i < count; i += analog->encoding->unitsize) {
fb019a0e BV	182	for (b = 0; b < analog->encoding->unitsize; b++) {
fb019a0e BV	183	if (analog->encoding->is_bigendian == bigendian)
3e277549 ML	184	((uint8_t *)outbuf)[i + b] =
3e277549 ML	185	((uint8_t )analog->data)[i analog->encoding->unitsize + b];
fb019a0e	186	else
3e277549 ML	187	((uint8_t *)outbuf)[i + (analog->encoding->unitsize - b)] =
3e277549 ML	188	((uint8_t )analog->data)[i analog->encoding->unitsize + b];
fb019a0e BV	189	}
fb019a0e BV	190	if (analog->encoding->scale.p != analog->encoding->scale.q)
4b4fdeea BV	191	outbuf[i] = (outbuf[i] * analog->encoding->scale.p) / analog->encoding->scale.q;
	192	offset = ((float)analog->encoding->offset.p / (float)analog->encoding->offset.q);
	193	outbuf[i] += offset;
fb019a0e BV	194	}
	195	}
	196
	197	return SR_OK;
	198	}
c2a25ebb BV	199
	200	/*
	201	* Convert a floating point value to a string, limited to the given
	202	* number of decimal digits.
	203	*
	204	* @param value The value to convert.
	205	* @param digits Number of digits after the decimal point to print.
a24da9a8 ML	206	* @param result Pointer to store result.
	207	*
	208	* The string is allocated by the function and must be freed by the caller
	209	* after use by calling g_free().
c2a25ebb BV	210	*
	211	* @retval SR_OK
	212	*
	213	* @since 0.4.0
	214	*/
a24da9a8	215	SR_API int sr_analog_float_to_string(float value, int digits, char **result)
c2a25ebb BV	216	{
	217	int cnt, i;
	218
	219	/* This produces at least one too many digits */
a24da9a8	220	result = g_strdup_printf("%.f", digits, value);
a9b2283f BV	221	for (i = 0, cnt = 0; (*result)[i]; i++) {
a9b2283f BV	222	if (isdigit((*result)[i++]))
c2a25ebb BV	223	cnt++;
c2a25ebb BV	224	if (cnt == digits) {
a9b2283f	225	(*result)[i] = 0;
c2a25ebb BV	226	break;
	227	}
	228	}
	229
	230	return SR_OK;
	231	}
	232
a5892391 BV	233	/*
	234	* Convert the unit/MQ/MQ flags in the analog struct to a string.
	235	*
	236	* @param analog Struct containing the unit, MQ and MQ flags.
a24da9a8 ML	237	* @param result Pointer to store result.
	238	*
	239	* The string is allocated by the function and must be freed by the caller
	240	* after use by calling g_free().
a5892391 BV	241	*
	242	* @retval SR_OK
	243	*
	244	* @since 0.4.0
	245	*/
	246	SR_API int sr_analog_unit_to_string(const struct sr_datafeed_analog2 *analog,
a24da9a8	247	char **result)
a5892391	248	{
a24da9a8 ML	249	int i;
a24da9a8 ML	250	GString *buf = g_string_new(NULL);
a5892391	251
a5892391 BV	252	for (i = 0; unit_strings[i].value; i++) {
a5892391 BV	253	if (analog->meaning->unit == unit_strings[i].value) {
a24da9a8	254	g_string_assign(buf, unit_strings[i].str);
a5892391 BV	255	break;
	256	}
	257	}
	258
	259	/* More than one MQ flag may apply. */
a24da9a8 ML	260	for (i = 0; mq_strings[i].value; i++)
	261	if (analog->meaning->mqflags & mq_strings[i].value)
	262	g_string_append(buf, mq_strings[i].str);
	263
	264	*result = buf->str;
	265	g_string_free(buf, FALSE);
a5892391 BV	266
	267	return SR_OK;
	268	}
	269
90cefe0c BV	270	/*
	271	* Set sr_rational r to the given value.
	272	*
	273	* @param p Numerator
	274	* @param q Denominator
	275	*/
53e5d3d1	276	SR_API void sr_rational_set(struct sr_rational *r, int64_t p, uint64_t q)
90cefe0c BV	277	{
	278	r->p = p;
	279	r->q = q;
	280	}
	281
e00b3f58	282	/** @} */