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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de> | |
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 2 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, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | /* | |
22 | * Fortune Semiconductor FS9922-DMM3/FS9922-DMM4 protocol parser. | |
23 | */ | |
24 | ||
25 | #include <string.h> | |
26 | #include <ctype.h> | |
27 | #include <math.h> | |
28 | #include <glib.h> | |
29 | #include "libsigrok.h" | |
30 | #include "libsigrok-internal.h" | |
31 | ||
32 | /* Message logging helpers with driver-specific prefix string. */ | |
33 | #define DRIVER_LOG_DOMAIN "fs9922: " | |
34 | #define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args) | |
35 | #define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args) | |
36 | #define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args) | |
37 | #define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args) | |
38 | #define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args) | |
39 | #define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args) | |
40 | ||
41 | static gboolean flags_valid(const struct fs9922_info *info) | |
42 | { | |
43 | int count; | |
44 | ||
45 | /* Does the packet have more than one multiplier? */ | |
46 | count = 0; | |
47 | count += (info->is_nano) ? 1 : 0; | |
48 | count += (info->is_micro) ? 1 : 0; | |
49 | count += (info->is_milli) ? 1 : 0; | |
50 | count += (info->is_kilo) ? 1 : 0; | |
51 | count += (info->is_mega) ? 1 : 0; | |
52 | if (count > 1) { | |
53 | sr_err("More than one multiplier detected in packet."); | |
54 | return FALSE; | |
55 | } | |
56 | ||
57 | /* Does the packet "measure" more than one type of value? */ | |
58 | count = 0; | |
59 | count += (info->is_diode) ? 1 : 0; | |
60 | count += (info->is_percent) ? 1 : 0; | |
61 | count += (info->is_volt) ? 1 : 0; | |
62 | count += (info->is_ampere) ? 1 : 0; | |
63 | count += (info->is_ohm) ? 1 : 0; | |
64 | count += (info->is_hfe) ? 1 : 0; | |
65 | count += (info->is_hertz) ? 1 : 0; | |
66 | count += (info->is_farad) ? 1 : 0; | |
67 | count += (info->is_celsius) ? 1 : 0; | |
68 | count += (info->is_fahrenheit) ? 1 : 0; | |
69 | if (count > 1) { | |
70 | sr_err("More than one measurement type detected in packet."); | |
71 | return FALSE; | |
72 | } | |
73 | ||
74 | /* Both AC and DC set? */ | |
75 | if (info->is_ac && info->is_dc) { | |
76 | sr_err("Both AC and DC flags detected in packet."); | |
77 | return FALSE; | |
78 | } | |
79 | ||
80 | /* Both Celsius and Fahrenheit set? */ | |
81 | if (info->is_celsius && info->is_fahrenheit) { | |
82 | sr_err("Both Celsius and Fahrenheit flags detected in packet."); | |
83 | return FALSE; | |
84 | } | |
85 | ||
86 | return TRUE; | |
87 | } | |
88 | ||
89 | static int parse_value(const uint8_t *buf, float *result) | |
90 | { | |
91 | int sign, intval; | |
92 | float floatval; | |
93 | ||
94 | /* Byte 0: Sign ('+' or '-') */ | |
95 | if (buf[0] == '+') { | |
96 | sign = 1; | |
97 | } else if (buf[0] == '-') { | |
98 | sign = -1; | |
99 | } else { | |
100 | sr_err("Invalid sign byte: 0x%02x.", buf[0]); | |
101 | return SR_ERR; | |
102 | } | |
103 | ||
104 | /* | |
105 | * Bytes 1-4: Value (4 decimal digits) | |
106 | * | |
107 | * Over limit: "0.L" on the display, "?0:?" as protocol "digits". | |
108 | */ | |
109 | if (buf[1] == '?' && buf[2] == '0' && buf[3] == ':' && buf[4] == '?') { | |
110 | sr_spew("Over limit."); | |
111 | *result = INFINITY; | |
112 | return SR_OK; | |
113 | } else if (!isdigit(buf[1]) || !isdigit(buf[2]) || | |
114 | !isdigit(buf[3]) || !isdigit(buf[4])) { | |
115 | sr_err("Value contained invalid digits: %02x %02x %02x %02x (" | |
116 | "%c %c %c %c).", buf[1], buf[2], buf[3], buf[4]); | |
117 | return SR_ERR; | |
118 | } | |
119 | intval = 0; | |
120 | intval += (buf[1] - '0') * 1000; | |
121 | intval += (buf[2] - '0') * 100; | |
122 | intval += (buf[3] - '0') * 10; | |
123 | intval += (buf[4] - '0') * 1; | |
124 | ||
125 | floatval = (float)intval; | |
126 | ||
127 | /* Byte 5: Always ' ' (space, 0x20) */ | |
128 | ||
129 | /* | |
130 | * Byte 6: Decimal point position ('0', '1', '2', or '4') | |
131 | * | |
132 | * Note: The Fortune Semiconductor FS9922-DMM3/4 datasheets both have | |
133 | * an error/typo here. They claim that the values '0'/'1'/'2'/'3' are | |
134 | * used, but '0'/'1'/'2'/'4' is actually correct. | |
135 | */ | |
136 | if (buf[6] != '0' && buf[6] != '1' && buf[6] != '2' && buf[6] != '4') { | |
137 | sr_err("Invalid decimal point value: 0x%02x.", buf[6]); | |
138 | return SR_ERR; | |
139 | } | |
140 | if (buf[6] == '0') | |
141 | floatval /= 1; | |
142 | else if (buf[6] == '1') | |
143 | floatval /= 1000; | |
144 | else if (buf[6] == '2') | |
145 | floatval /= 100; | |
146 | else if (buf[6] == '4') | |
147 | floatval /= 10; | |
148 | ||
149 | /* Apply sign. */ | |
150 | floatval *= sign; | |
151 | ||
152 | sr_spew("The display value is %f.", floatval); | |
153 | ||
154 | *result = floatval; | |
155 | ||
156 | return SR_OK; | |
157 | } | |
158 | ||
159 | static void parse_flags(const uint8_t *buf, struct fs9922_info *info) | |
160 | { | |
161 | /* Z1/Z2/Z3/Z4 are bits for user-defined LCD symbols (on/off). */ | |
162 | ||
163 | /* Byte 7 */ | |
164 | /* Bit 7: Always 0 */ | |
165 | /* Bit 6: Always 0 */ | |
166 | info->is_auto = (buf[7] & (1 << 5)) != 0; | |
167 | info->is_dc = (buf[7] & (1 << 4)) != 0; | |
168 | info->is_ac = (buf[7] & (1 << 3)) != 0; | |
169 | info->is_rel = (buf[7] & (1 << 2)) != 0; | |
170 | info->is_hold = (buf[7] & (1 << 1)) != 0; | |
171 | info->is_bpn = (buf[7] & (1 << 0)) != 0; /* Bargraph shown */ | |
172 | ||
173 | /* Byte 8 */ | |
174 | info->is_z1 = (buf[8] & (1 << 7)) != 0; /* User symbol 1 */ | |
175 | info->is_z2 = (buf[8] & (1 << 6)) != 0; /* User symbol 2 */ | |
176 | info->is_max = (buf[8] & (1 << 5)) != 0; | |
177 | info->is_min = (buf[8] & (1 << 4)) != 0; | |
178 | info->is_apo = (buf[8] & (1 << 3)) != 0; /* Auto-poweroff on */ | |
179 | info->is_bat = (buf[8] & (1 << 2)) != 0; /* Battery low */ | |
180 | info->is_nano = (buf[8] & (1 << 1)) != 0; | |
181 | info->is_z3 = (buf[8] & (1 << 0)) != 0; /* User symbol 3 */ | |
182 | ||
183 | /* Byte 9 */ | |
184 | info->is_micro = (buf[9] & (1 << 7)) != 0; | |
185 | info->is_milli = (buf[9] & (1 << 6)) != 0; | |
186 | info->is_kilo = (buf[9] & (1 << 5)) != 0; | |
187 | info->is_mega = (buf[9] & (1 << 4)) != 0; | |
188 | info->is_beep = (buf[9] & (1 << 3)) != 0; | |
189 | info->is_diode = (buf[9] & (1 << 2)) != 0; | |
190 | info->is_percent = (buf[9] & (1 << 1)) != 0; | |
191 | info->is_z4 = (buf[8] & (1 << 0)) != 0; /* User symbol 4 */ | |
192 | ||
193 | /* Byte 10 */ | |
194 | info->is_volt = (buf[10] & (1 << 7)) != 0; | |
195 | info->is_ampere = (buf[10] & (1 << 6)) != 0; | |
196 | info->is_ohm = (buf[10] & (1 << 5)) != 0; | |
197 | info->is_hfe = (buf[10] & (1 << 4)) != 0; | |
198 | info->is_hertz = (buf[10] & (1 << 3)) != 0; | |
199 | info->is_farad = (buf[10] & (1 << 2)) != 0; | |
200 | info->is_celsius = (buf[10] & (1 << 1)) != 0; /* Only FS9922-DMM4 */ | |
201 | info->is_fahrenheit = (buf[10] & (1 << 0)) != 0; /* Only FS9922-DMM4 */ | |
202 | ||
203 | /* | |
204 | * Byte 11: Bar graph | |
205 | * | |
206 | * Bit 7 contains the sign of the bargraph number (if the bit is set, | |
207 | * the number is negative), bits 6..0 contain the actual number. | |
208 | * Valid range: 0-40 (FS9922-DMM3), 0-60 (FS9922-DMM4). | |
209 | * | |
210 | * Upon "over limit" the bargraph value is 1 count above the highest | |
211 | * valid number (i.e. 41 or 61, depending on chip). | |
212 | */ | |
213 | if (info->is_bpn) { | |
214 | info->bargraph_sign = ((buf[11] & (1 << 7)) != 0) ? -1 : 1; | |
215 | info->bargraph_value = (buf[11] & 0x7f); | |
216 | info->bargraph_value *= info->bargraph_sign; | |
217 | } | |
218 | ||
219 | /* Byte 12: Always '\r' (carriage return, 0x0d, 13) */ | |
220 | ||
221 | /* Byte 13: Always '\n' (newline, 0x0a, 10) */ | |
222 | } | |
223 | ||
224 | static void handle_flags(struct sr_datafeed_analog *analog, float *floatval, | |
225 | const struct fs9922_info *info) | |
226 | { | |
227 | /* Factors */ | |
228 | if (info->is_nano) | |
229 | *floatval /= 1000000000; | |
230 | if (info->is_micro) | |
231 | *floatval /= 1000000; | |
232 | if (info->is_milli) | |
233 | *floatval /= 1000; | |
234 | if (info->is_kilo) | |
235 | *floatval *= 1000; | |
236 | if (info->is_mega) | |
237 | *floatval *= 1000000; | |
238 | ||
239 | /* Measurement modes */ | |
240 | if (info->is_volt) { | |
241 | analog->mq = SR_MQ_VOLTAGE; | |
242 | analog->unit = SR_UNIT_VOLT; | |
243 | } | |
244 | if (info->is_ampere) { | |
245 | analog->mq = SR_MQ_CURRENT; | |
246 | analog->unit = SR_UNIT_AMPERE; | |
247 | } | |
248 | if (info->is_ohm) { | |
249 | analog->mq = SR_MQ_RESISTANCE; | |
250 | analog->unit = SR_UNIT_OHM; | |
251 | } | |
252 | if (info->is_hfe) { | |
253 | analog->mq = SR_MQ_GAIN; | |
254 | analog->unit = SR_UNIT_UNITLESS; | |
255 | } | |
256 | if (info->is_hertz) { | |
257 | analog->mq = SR_MQ_FREQUENCY; | |
258 | analog->unit = SR_UNIT_HERTZ; | |
259 | } | |
260 | if (info->is_farad) { | |
261 | analog->mq = SR_MQ_CAPACITANCE; | |
262 | analog->unit = SR_UNIT_FARAD; | |
263 | } | |
264 | if (info->is_celsius) { | |
265 | analog->mq = SR_MQ_TEMPERATURE; | |
266 | analog->unit = SR_UNIT_CELSIUS; | |
267 | } | |
268 | if (info->is_fahrenheit) { | |
269 | analog->mq = SR_MQ_TEMPERATURE; | |
270 | analog->unit = SR_UNIT_FAHRENHEIT; | |
271 | } | |
272 | if (info->is_beep) { | |
273 | analog->mq = SR_MQ_CONTINUITY; | |
274 | analog->unit = SR_UNIT_BOOLEAN; | |
275 | *floatval = (*floatval < 0.0) ? 0.0 : 1.0; | |
276 | } | |
277 | if (info->is_diode) { | |
278 | analog->mq = SR_MQ_VOLTAGE; | |
279 | analog->unit = SR_UNIT_VOLT; | |
280 | } | |
281 | if (info->is_percent) { | |
282 | analog->mq = SR_MQ_DUTY_CYCLE; | |
283 | analog->unit = SR_UNIT_PERCENTAGE; | |
284 | } | |
285 | ||
286 | /* Measurement related flags */ | |
287 | if (info->is_ac) | |
288 | analog->mqflags |= SR_MQFLAG_AC; | |
289 | if (info->is_dc) | |
290 | analog->mqflags |= SR_MQFLAG_DC; | |
291 | if (info->is_auto) | |
292 | analog->mqflags |= SR_MQFLAG_AUTORANGE; | |
293 | if (info->is_hold) | |
294 | analog->mqflags |= SR_MQFLAG_HOLD; | |
295 | if (info->is_max) | |
296 | analog->mqflags |= SR_MQFLAG_MAX; | |
297 | if (info->is_min) | |
298 | analog->mqflags |= SR_MQFLAG_MIN; | |
299 | if (info->is_rel) | |
300 | analog->mqflags |= SR_MQFLAG_RELATIVE; | |
301 | ||
302 | /* Other flags */ | |
303 | if (info->is_apo) | |
304 | sr_spew("Automatic power-off function is active."); | |
305 | if (info->is_bat) | |
306 | sr_spew("Battery is low."); | |
307 | if (info->is_z1) | |
308 | sr_spew("User-defined LCD symbol 1 is active."); | |
309 | if (info->is_z2) | |
310 | sr_spew("User-defined LCD symbol 2 is active."); | |
311 | if (info->is_z3) | |
312 | sr_spew("User-defined LCD symbol 3 is active."); | |
313 | if (info->is_z4) | |
314 | sr_spew("User-defined LCD symbol 4 is active."); | |
315 | if (info->is_bpn) | |
316 | sr_spew("The bargraph value is %d.", info->bargraph_value); | |
317 | else | |
318 | sr_spew("The bargraph is not active."); | |
319 | ||
320 | } | |
321 | ||
322 | SR_PRIV gboolean sr_fs9922_packet_valid(const uint8_t *buf) | |
323 | { | |
324 | struct fs9922_info info; | |
325 | ||
326 | /* Byte 0: Sign (must be '+' or '-') */ | |
327 | if (buf[0] != '+' && buf[0] != '-') | |
328 | return FALSE; | |
329 | ||
330 | /* Byte 12: Always '\r' (carriage return, 0x0d, 13) */ | |
331 | /* Byte 13: Always '\n' (newline, 0x0a, 10) */ | |
332 | if (buf[12] != '\r' || buf[13] != '\n') | |
333 | return FALSE; | |
334 | ||
335 | parse_flags(buf, &info); | |
336 | ||
337 | return flags_valid(&info); | |
338 | } | |
339 | ||
340 | /** | |
341 | * Parse a protocol packet. | |
342 | * | |
343 | * @param buf Buffer containing the protocol packet. Must not be NULL. | |
344 | * @param floatval Pointer to a float variable. That variable will contain the | |
345 | * result value upon parsing success. Must not be NULL. | |
346 | * @param analog Pointer to a struct sr_datafeed_analog. The struct will be | |
347 | * filled with data according to the protocol packet. | |
348 | * Must not be NULL. | |
349 | * @param info Pointer to a struct fs9922_info. The struct will be filled | |
350 | * with data according to the protocol packet. Must not be NULL. | |
351 | * | |
352 | * @return SR_OK upon success, SR_ERR upon failure. Upon errors, the | |
353 | * 'analog' variable contents are undefined and should not be used. | |
354 | */ | |
355 | SR_PRIV int sr_fs9922_parse(const uint8_t *buf, float *floatval, | |
356 | struct sr_datafeed_analog *analog, void *info) | |
357 | { | |
358 | int ret; | |
359 | struct fs9922_info *info_local; | |
360 | ||
361 | info_local = (struct fs9922_info *)info; | |
362 | ||
363 | if ((ret = parse_value(buf, floatval)) != SR_OK) { | |
364 | sr_err("Error parsing value: %d.", ret); | |
365 | return ret; | |
366 | } | |
367 | ||
368 | parse_flags(buf, info_local); | |
369 | handle_flags(analog, floatval, info_local); | |
370 | ||
371 | return SR_OK; | |
372 | } |