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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 | ||
20 | #include <config.h> | |
21 | #include <stdio.h> | |
22 | #include <stdint.h> | |
23 | #include <string.h> | |
24 | #include <ctype.h> | |
25 | #include <libsigrok/libsigrok.h> | |
26 | #include "libsigrok-internal.h" | |
27 | ||
28 | /** @cond PRIVATE */ | |
29 | #define LOG_PREFIX "analog" | |
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 | */ | |
45 | ||
46 | struct unit_mq_string { | |
47 | uint64_t value; | |
48 | char *str; | |
49 | }; | |
50 | ||
51 | /* Please use the same order as in enum sr_unit (libsigrok.h). */ | |
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" }, | |
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, "%" }, | |
62 | { SR_UNIT_BOOLEAN, "" }, | |
63 | { SR_UNIT_SECOND, "s" }, | |
64 | { SR_UNIT_SIEMENS, "S" }, | |
65 | { SR_UNIT_DECIBEL_MW, "dBu" }, | |
66 | { SR_UNIT_DECIBEL_VOLT, "dBv" }, | |
67 | { SR_UNIT_UNITLESS, "" }, | |
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" }, | |
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" }, | |
90 | ALL_ZERO | |
91 | }; | |
92 | ||
93 | /* Please use the same order as in enum sr_mqflag (libsigrok.h). */ | |
94 | static struct unit_mq_string mq_strings[] = { | |
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" }, | |
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" }, | |
114 | { SR_MQFLAG_AVG, " AVG" }, | |
115 | { SR_MQFLAG_REFERENCE, " REF" }, | |
116 | { SR_MQFLAG_UNSTABLE, " UNSTABLE" }, | |
117 | ALL_ZERO | |
118 | }; | |
119 | ||
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 | ||
154 | SR_API int sr_analog_to_float(const struct sr_datafeed_analog2 *analog, | |
155 | float *outbuf) | |
156 | { | |
157 | float offset; | |
158 | unsigned int b, i; | |
159 | gboolean bigendian; | |
160 | unsigned int count = (analog->num_samples | |
161 | * g_slist_length(analog->meaning->channels)); | |
162 | ||
163 | #ifdef WORDS_BIGENDIAN | |
164 | bigendian = TRUE; | |
165 | #else | |
166 | bigendian = FALSE; | |
167 | #endif | |
168 | if (!analog->encoding->is_float) { | |
169 | /* TODO */ | |
170 | sr_err("Only floating-point encoding supported so far."); | |
171 | return SR_ERR; | |
172 | } | |
173 | ||
174 | if (analog->encoding->unitsize == sizeof(float) | |
175 | && analog->encoding->is_bigendian == bigendian | |
176 | && analog->encoding->scale.p == 1 | |
177 | && analog->encoding->scale.q == 1 | |
178 | && analog->encoding->offset.p / (float)analog->encoding->offset.q == 0) { | |
179 | /* The data is already in the right format. */ | |
180 | memcpy(outbuf, analog->data, count * sizeof(float)); | |
181 | } else { | |
182 | for (i = 0; i < count; i += analog->encoding->unitsize) { | |
183 | for (b = 0; b < analog->encoding->unitsize; b++) { | |
184 | if (analog->encoding->is_bigendian == bigendian) | |
185 | ((uint8_t *)outbuf)[i + b] = | |
186 | ((uint8_t *)analog->data)[i * analog->encoding->unitsize + b]; | |
187 | else | |
188 | ((uint8_t *)outbuf)[i + (analog->encoding->unitsize - b)] = | |
189 | ((uint8_t *)analog->data)[i * analog->encoding->unitsize + b]; | |
190 | } | |
191 | if (analog->encoding->scale.p != 1 | |
192 | || analog->encoding->scale.q != 1) | |
193 | outbuf[i] = (outbuf[i] * analog->encoding->scale.p) / analog->encoding->scale.q; | |
194 | offset = ((float)analog->encoding->offset.p / (float)analog->encoding->offset.q); | |
195 | outbuf[i] += offset; | |
196 | } | |
197 | } | |
198 | ||
199 | return SR_OK; | |
200 | } | |
201 | ||
202 | /* | |
203 | * Convert a floating point value to a string, limited to the given | |
204 | * number of decimal digits. | |
205 | * | |
206 | * @param value The value to convert. | |
207 | * @param digits Number of digits after the decimal point to print. | |
208 | * @param result Pointer to store result. | |
209 | * | |
210 | * The string is allocated by the function and must be freed by the caller | |
211 | * after use by calling g_free(). | |
212 | * | |
213 | * @retval SR_OK | |
214 | * | |
215 | * @since 0.4.0 | |
216 | */ | |
217 | SR_API int sr_analog_float_to_string(float value, int digits, char **result) | |
218 | { | |
219 | int cnt, i; | |
220 | ||
221 | /* This produces at least one too many digits */ | |
222 | *result = g_strdup_printf("%.*f", digits, value); | |
223 | for (i = 0, cnt = 0; (*result)[i]; i++) { | |
224 | if (isdigit((*result)[i++])) | |
225 | cnt++; | |
226 | if (cnt == digits) { | |
227 | (*result)[i] = 0; | |
228 | break; | |
229 | } | |
230 | } | |
231 | ||
232 | return SR_OK; | |
233 | } | |
234 | ||
235 | /* | |
236 | * Convert the unit/MQ/MQ flags in the analog struct to a string. | |
237 | * | |
238 | * @param analog Struct containing the unit, MQ and MQ flags. | |
239 | * @param result Pointer to store result. | |
240 | * | |
241 | * The string is allocated by the function and must be freed by the caller | |
242 | * after use by calling g_free(). | |
243 | * | |
244 | * @retval SR_OK | |
245 | * | |
246 | * @since 0.4.0 | |
247 | */ | |
248 | SR_API int sr_analog_unit_to_string(const struct sr_datafeed_analog2 *analog, | |
249 | char **result) | |
250 | { | |
251 | int i; | |
252 | GString *buf = g_string_new(NULL); | |
253 | ||
254 | for (i = 0; unit_strings[i].value; i++) { | |
255 | if (analog->meaning->unit == unit_strings[i].value) { | |
256 | g_string_assign(buf, unit_strings[i].str); | |
257 | break; | |
258 | } | |
259 | } | |
260 | ||
261 | /* More than one MQ flag may apply. */ | |
262 | for (i = 0; mq_strings[i].value; i++) | |
263 | if (analog->meaning->mqflags & mq_strings[i].value) | |
264 | g_string_append(buf, mq_strings[i].str); | |
265 | ||
266 | *result = buf->str; | |
267 | g_string_free(buf, FALSE); | |
268 | ||
269 | return SR_OK; | |
270 | } | |
271 | ||
272 | /* | |
273 | * Set sr_rational r to the given value. | |
274 | * | |
275 | * @param p Numerator | |
276 | * @param q Denominator | |
277 | */ | |
278 | SR_API void sr_rational_set(struct sr_rational *r, int64_t p, uint64_t q) | |
279 | { | |
280 | r->p = p; | |
281 | r->q = q; | |
282 | } | |
283 | ||
284 | /** @} */ |