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daa39012 AJ |
1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2015 Aurelien Jacobs <aurel@gnuage.org> | |
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> |
daa39012 AJ |
21 | #include <glib.h> |
22 | #include <string.h> | |
c1aae900 | 23 | #include <libsigrok/libsigrok.h> |
f54ebe0c | 24 | #include "libsigrok-internal.h" |
daa39012 AJ |
25 | |
26 | #define LOG_PREFIX "modbus" | |
27 | ||
4c938fc2 AJ |
28 | SR_PRIV extern const struct sr_modbus_dev_inst modbus_serial_rtu_dev; |
29 | ||
daa39012 | 30 | static const struct sr_modbus_dev_inst *modbus_devs[] = { |
1df81f4b | 31 | #ifdef HAVE_SERIAL_COMM |
d9251a2c | 32 | &modbus_serial_rtu_dev, /* Must be last as it matches any resource. */ |
4c938fc2 | 33 | #endif |
daa39012 AJ |
34 | }; |
35 | ||
52fb2d44 WS |
36 | static const unsigned int modbus_devs_size = ARRAY_SIZE(modbus_devs); |
37 | ||
daa39012 | 38 | static struct sr_dev_inst *sr_modbus_scan_resource(const char *resource, |
f54ebe0c UH |
39 | const char *serialcomm, int modbusaddr, |
40 | struct sr_dev_inst *(*probe_device)(struct sr_modbus_dev_inst *modbus)) | |
daa39012 AJ |
41 | { |
42 | struct sr_modbus_dev_inst *modbus; | |
43 | struct sr_dev_inst *sdi; | |
44 | ||
45 | if (!(modbus = modbus_dev_inst_new(resource, serialcomm, modbusaddr))) | |
46 | return NULL; | |
47 | ||
48 | if (sr_modbus_open(modbus) != SR_OK) { | |
ae1827f5 | 49 | sr_info("Couldn't open Modbus device."); |
daa39012 AJ |
50 | sr_modbus_free(modbus); |
51 | return NULL; | |
52 | }; | |
53 | ||
1d657f47 | 54 | sdi = probe_device(modbus); |
daa39012 AJ |
55 | |
56 | sr_modbus_close(modbus); | |
f54ebe0c | 57 | |
1d657f47 | 58 | if (!sdi) |
59 | sr_modbus_free(modbus); | |
60 | ||
61 | return sdi; | |
daa39012 AJ |
62 | } |
63 | ||
64 | /** | |
ae1827f5 | 65 | * Scan for Modbus devices which match a probing function. |
daa39012 | 66 | * |
f54ebe0c UH |
67 | * @param drvc The driver context doing the scan. |
68 | * @param options The scan options to find devies. | |
69 | * @param probe_device The callback function that will be called for each | |
70 | * found device to validate whether this device matches | |
71 | * what we are scanning for. | |
daa39012 | 72 | * |
f54ebe0c | 73 | * @return A list of the devices found or NULL if no devices were found. |
daa39012 AJ |
74 | */ |
75 | SR_PRIV GSList *sr_modbus_scan(struct drv_context *drvc, GSList *options, | |
f54ebe0c | 76 | struct sr_dev_inst *(*probe_device)(struct sr_modbus_dev_inst *modbus)) |
daa39012 AJ |
77 | { |
78 | GSList *resources, *l, *devices; | |
79 | struct sr_dev_inst *sdi; | |
80 | const char *resource = NULL; | |
81 | const char *serialcomm = NULL; | |
82 | int modbusaddr = 1; | |
83 | gchar **res; | |
f54ebe0c | 84 | unsigned int i; |
daa39012 AJ |
85 | |
86 | for (l = options; l; l = l->next) { | |
87 | struct sr_config *src = l->data; | |
88 | switch (src->key) { | |
89 | case SR_CONF_CONN: | |
90 | resource = g_variant_get_string(src->data, NULL); | |
91 | break; | |
92 | case SR_CONF_SERIALCOMM: | |
93 | serialcomm = g_variant_get_string(src->data, NULL); | |
94 | break; | |
95 | case SR_CONF_MODBUSADDR: | |
96 | modbusaddr = g_variant_get_uint64(src->data); | |
97 | break; | |
98 | } | |
99 | } | |
100 | ||
101 | devices = NULL; | |
52fb2d44 | 102 | for (i = 0; i < modbus_devs_size; i++) { |
daa39012 AJ |
103 | if ((resource && strcmp(resource, modbus_devs[i]->prefix)) |
104 | || !modbus_devs[i]->scan) | |
105 | continue; | |
106 | resources = modbus_devs[i]->scan(modbusaddr); | |
107 | for (l = resources; l; l = l->next) { | |
108 | res = g_strsplit(l->data, ":", 2); | |
109 | if (res[0] && (sdi = sr_modbus_scan_resource(res[0], | |
f54ebe0c UH |
110 | serialcomm ? serialcomm : res[1], |
111 | modbusaddr, probe_device))) { | |
daa39012 AJ |
112 | devices = g_slist_append(devices, sdi); |
113 | sdi->connection_id = g_strdup(l->data); | |
114 | } | |
115 | g_strfreev(res); | |
116 | } | |
117 | g_slist_free_full(resources, g_free); | |
118 | } | |
119 | ||
120 | if (!devices && resource) { | |
121 | sdi = sr_modbus_scan_resource(resource, serialcomm, modbusaddr, | |
122 | probe_device); | |
123 | if (sdi) | |
124 | devices = g_slist_append(NULL, sdi); | |
125 | } | |
126 | ||
127 | /* Tack a copy of the newly found devices onto the driver list. */ | |
128 | if (devices) | |
129 | drvc->instances = g_slist_concat(drvc->instances, g_slist_copy(devices)); | |
130 | ||
131 | return devices; | |
132 | } | |
133 | ||
134 | /** | |
ae1827f5 | 135 | * Allocate and initialize a struct for a Modbus device instance. |
daa39012 | 136 | * |
f54ebe0c UH |
137 | * @param resource The resource description string. |
138 | * @param serialcomm Additionnal parameters for serial port resources. | |
daa39012 | 139 | * |
f54ebe0c | 140 | * @return The allocated sr_modbus_dev_inst structure or NULL on failure. |
daa39012 AJ |
141 | */ |
142 | SR_PRIV struct sr_modbus_dev_inst *modbus_dev_inst_new(const char *resource, | |
143 | const char *serialcomm, int modbusaddr) | |
144 | { | |
145 | struct sr_modbus_dev_inst *modbus = NULL; | |
146 | const struct sr_modbus_dev_inst *modbus_dev; | |
147 | gchar **params; | |
f54ebe0c | 148 | unsigned int i; |
daa39012 | 149 | |
52fb2d44 | 150 | for (i = 0; i < modbus_devs_size; i++) { |
daa39012 AJ |
151 | modbus_dev = modbus_devs[i]; |
152 | if (!strncmp(resource, modbus_dev->prefix, strlen(modbus_dev->prefix))) { | |
153 | sr_dbg("Opening %s device %s.", modbus_dev->name, resource); | |
154 | modbus = g_malloc(sizeof(*modbus)); | |
155 | *modbus = *modbus_dev; | |
156 | modbus->priv = g_malloc0(modbus->priv_size); | |
157 | modbus->read_timeout_ms = 1000; | |
158 | params = g_strsplit(resource, "/", 0); | |
159 | if (modbus->dev_inst_new(modbus->priv, resource, | |
160 | params, serialcomm, modbusaddr) != SR_OK) { | |
161 | sr_modbus_free(modbus); | |
162 | modbus = NULL; | |
163 | } | |
164 | g_strfreev(params); | |
165 | break; | |
166 | } | |
167 | } | |
168 | ||
169 | return modbus; | |
170 | } | |
171 | ||
172 | /** | |
ae1827f5 | 173 | * Open the specified Modbus device. |
daa39012 | 174 | * |
ae1827f5 | 175 | * @param modbus Previously initialized Modbus device structure. |
daa39012 AJ |
176 | * |
177 | * @return SR_OK on success, SR_ERR on failure. | |
178 | */ | |
179 | SR_PRIV int sr_modbus_open(struct sr_modbus_dev_inst *modbus) | |
180 | { | |
181 | return modbus->open(modbus->priv); | |
182 | } | |
183 | ||
184 | /** | |
ae1827f5 | 185 | * Add an event source for a Modbus device. |
daa39012 AJ |
186 | * |
187 | * @param session The session to add the event source to. | |
ae1827f5 | 188 | * @param modbus Previously initialized Modbus device structure. |
daa39012 AJ |
189 | * @param events Events to check for. |
190 | * @param timeout Max time to wait before the callback is called, ignored if 0. | |
191 | * @param cb Callback function to add. Must not be NULL. | |
192 | * @param cb_data Data for the callback function. Can be NULL. | |
193 | * | |
194 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or | |
195 | * SR_ERR_MALLOC upon memory allocation errors. | |
196 | */ | |
197 | SR_PRIV int sr_modbus_source_add(struct sr_session *session, | |
198 | struct sr_modbus_dev_inst *modbus, int events, int timeout, | |
199 | sr_receive_data_callback cb, void *cb_data) | |
200 | { | |
201 | return modbus->source_add(session, modbus->priv, events, timeout, cb, cb_data); | |
202 | } | |
203 | ||
204 | /** | |
ae1827f5 | 205 | * Remove event source for a Modbus device. |
daa39012 AJ |
206 | * |
207 | * @param session The session to remove the event source from. | |
ae1827f5 | 208 | * @param modbus Previously initialized Modbus device structure. |
daa39012 AJ |
209 | * |
210 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or | |
211 | * SR_ERR_MALLOC upon memory allocation errors, SR_ERR_BUG upon | |
212 | * internal errors. | |
213 | */ | |
214 | SR_PRIV int sr_modbus_source_remove(struct sr_session *session, | |
215 | struct sr_modbus_dev_inst *modbus) | |
216 | { | |
217 | return modbus->source_remove(session, modbus->priv); | |
218 | } | |
219 | ||
220 | /** | |
ae1827f5 | 221 | * Send a Modbus command. |
daa39012 | 222 | * |
ae1827f5 UH |
223 | * @param modbus Previously initialized Modbus device structure. |
224 | * @param request Buffer containing the Modbus command to send. | |
f54ebe0c | 225 | * @param request_size The size of the request buffer. |
daa39012 AJ |
226 | * |
227 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or | |
228 | * SR_ERR on failure. | |
229 | */ | |
230 | SR_PRIV int sr_modbus_request(struct sr_modbus_dev_inst *modbus, | |
231 | uint8_t *request, int request_size) | |
232 | { | |
233 | if (!request || request_size < 1) | |
234 | return SR_ERR_ARG; | |
235 | ||
236 | return modbus->send(modbus->priv, request, request_size); | |
237 | } | |
238 | ||
239 | /** | |
ae1827f5 | 240 | * Receive a Modbus reply. |
daa39012 | 241 | * |
ae1827f5 UH |
242 | * @param modbus Previously initialized Modbus device structure. |
243 | * @param reply Buffer to store the received Modbus reply. | |
f54ebe0c | 244 | * @param reply_size The size of the reply buffer. |
daa39012 AJ |
245 | * |
246 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or | |
247 | * SR_ERR on failure. | |
248 | */ | |
249 | SR_PRIV int sr_modbus_reply(struct sr_modbus_dev_inst *modbus, | |
250 | uint8_t *reply, int reply_size) | |
251 | { | |
252 | int len, ret; | |
253 | gint64 laststart; | |
254 | unsigned int elapsed_ms; | |
255 | ||
256 | if (!reply || reply_size < 2) | |
257 | return SR_ERR_ARG; | |
258 | ||
259 | laststart = g_get_monotonic_time(); | |
260 | ||
261 | ret = modbus->read_begin(modbus->priv, reply); | |
262 | if (ret != SR_OK) | |
263 | return ret; | |
264 | if (*reply & 0x80) | |
265 | reply_size = 2; | |
266 | ||
267 | reply++; | |
268 | reply_size--; | |
269 | ||
270 | while (reply_size > 0) { | |
271 | len = modbus->read_data(modbus->priv, reply, reply_size); | |
272 | if (len < 0) { | |
ae1827f5 | 273 | sr_err("Incompletely read Modbus response."); |
daa39012 AJ |
274 | return SR_ERR; |
275 | } else if (len > 0) { | |
276 | laststart = g_get_monotonic_time(); | |
277 | } | |
278 | reply += len; | |
279 | reply_size -= len; | |
280 | elapsed_ms = (g_get_monotonic_time() - laststart) / 1000; | |
281 | if (elapsed_ms >= modbus->read_timeout_ms) { | |
ae1827f5 | 282 | sr_err("Timed out waiting for Modbus response."); |
daa39012 AJ |
283 | return SR_ERR; |
284 | } | |
285 | } | |
286 | ||
287 | ret = modbus->read_end(modbus->priv); | |
288 | if (ret != SR_OK) | |
289 | return ret; | |
290 | ||
291 | return SR_OK; | |
292 | } | |
293 | ||
294 | /** | |
ae1827f5 | 295 | * Send a Modbus command and receive the corresponding reply. |
daa39012 | 296 | * |
ae1827f5 UH |
297 | * @param modbus Previously initialized Modbus device structure. |
298 | * @param request Buffer containing the Modbus command to send. | |
f54ebe0c | 299 | * @param request_size The size of the request buffer. |
ae1827f5 | 300 | * @param reply Buffer to store the received Modbus reply. |
f54ebe0c | 301 | * @param reply_size The size of the reply buffer. |
daa39012 AJ |
302 | * |
303 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or | |
304 | * SR_ERR on failure. | |
305 | */ | |
306 | SR_PRIV int sr_modbus_request_reply(struct sr_modbus_dev_inst *modbus, | |
307 | uint8_t *request, int request_size, uint8_t *reply, int reply_size) | |
308 | { | |
309 | int ret; | |
310 | ret = sr_modbus_request(modbus, request, request_size); | |
311 | if (ret != SR_OK) | |
312 | return ret; | |
313 | return sr_modbus_reply(modbus, reply, reply_size); | |
314 | } | |
315 | ||
316 | enum { | |
f54ebe0c UH |
317 | MODBUS_READ_COILS = 0x01, |
318 | MODBUS_READ_HOLDING_REGISTERS = 0x03, | |
319 | MODBUS_WRITE_COIL = 0x05, | |
daa39012 AJ |
320 | MODBUS_WRITE_MULTIPLE_REGISTERS = 0x10, |
321 | }; | |
322 | ||
323 | static int sr_modbus_error_check(const uint8_t *reply) | |
324 | { | |
325 | const char *function = "UNKNOWN"; | |
326 | const char *error = NULL; | |
327 | char buf[8]; | |
328 | ||
329 | if (!(reply[0] & 0x80)) | |
330 | return FALSE; | |
331 | ||
332 | switch (reply[0] & ~0x80) { | |
333 | case MODBUS_READ_COILS: | |
f54ebe0c UH |
334 | function = "MODBUS_READ_COILS"; |
335 | break; | |
daa39012 | 336 | case MODBUS_READ_HOLDING_REGISTERS: |
f54ebe0c UH |
337 | function = "READ_HOLDING_REGISTERS"; |
338 | break; | |
daa39012 | 339 | case MODBUS_WRITE_COIL: |
f54ebe0c UH |
340 | function = "WRITE_COIL"; |
341 | break; | |
daa39012 | 342 | case MODBUS_WRITE_MULTIPLE_REGISTERS: |
f54ebe0c UH |
343 | function = "WRITE_MULTIPLE_REGISTERS"; |
344 | break; | |
daa39012 AJ |
345 | } |
346 | ||
347 | switch (reply[1]) { | |
348 | case 0x01: | |
f54ebe0c UH |
349 | error = "ILLEGAL FUNCTION"; |
350 | break; | |
daa39012 | 351 | case 0x02: |
f54ebe0c UH |
352 | error = "ILLEGAL DATA ADDRESS"; |
353 | break; | |
daa39012 | 354 | case 0x03: |
f54ebe0c UH |
355 | error = "ILLEGAL DATA VALUE"; |
356 | break; | |
daa39012 | 357 | case 0x04: |
f54ebe0c UH |
358 | error = "SLAVE DEVICE FAILURE"; |
359 | break; | |
daa39012 | 360 | case 0x05: |
f54ebe0c UH |
361 | error = "ACKNOWLEDGE"; |
362 | break; | |
daa39012 | 363 | case 0x06: |
f54ebe0c UH |
364 | error = "SLAVE DEVICE BUSY"; |
365 | break; | |
daa39012 | 366 | case 0x08: |
f54ebe0c UH |
367 | error = "MEMORY PARITY ERROR"; |
368 | break; | |
daa39012 | 369 | case 0x0A: |
f54ebe0c UH |
370 | error = "GATEWAY PATH UNAVAILABLE"; |
371 | break; | |
daa39012 | 372 | case 0x0B: |
f54ebe0c UH |
373 | error = "GATEWAY TARGET DEVICE FAILED TO RESPOND"; |
374 | break; | |
daa39012 AJ |
375 | } |
376 | if (!error) { | |
377 | snprintf(buf, sizeof(buf), "0x%X", reply[1]); | |
378 | error = buf; | |
379 | } | |
380 | ||
381 | sr_err("%s error executing %s function.", error, function); | |
f54ebe0c | 382 | |
daa39012 AJ |
383 | return TRUE; |
384 | } | |
385 | ||
386 | /** | |
ae1827f5 | 387 | * Send a Modbus read coils command and receive the corresponding coils values. |
daa39012 | 388 | * |
ae1827f5 UH |
389 | * @param modbus Previously initialized Modbus device structure. |
390 | * @param address The Modbus address of the first coil to read, or -1 to read | |
f54ebe0c UH |
391 | * the reply of a previouly sent read coils command. |
392 | * @param nb_coils The number of coils to read. | |
393 | * @param coils Buffer to store all the received coils values (1 bit per coil), | |
daa39012 AJ |
394 | * or NULL to send the read coil command without reading the reply. |
395 | * | |
396 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, | |
397 | * SR_ERR_DATA upon invalid data, or SR_ERR on failure. | |
398 | */ | |
399 | SR_PRIV int sr_modbus_read_coils(struct sr_modbus_dev_inst *modbus, | |
400 | int address, int nb_coils, uint8_t *coils) | |
401 | { | |
402 | uint8_t request[5], reply[2 + (nb_coils + 7) / 8]; | |
403 | int ret; | |
404 | ||
405 | if (address < -1 || address > 0xFFFF || nb_coils < 1 || nb_coils > 2000) | |
406 | return SR_ERR_ARG; | |
407 | ||
f54ebe0c UH |
408 | W8(request + 0, MODBUS_READ_COILS); |
409 | WB16(request + 1, address); | |
410 | WB16(request + 3, nb_coils); | |
daa39012 AJ |
411 | |
412 | if (address >= 0) { | |
413 | ret = sr_modbus_request(modbus, request, sizeof(request)); | |
414 | if (ret != SR_OK) | |
415 | return ret; | |
416 | } | |
417 | ||
418 | if (coils) { | |
419 | ret = sr_modbus_reply(modbus, reply, sizeof(reply)); | |
420 | if (ret != SR_OK) | |
421 | return ret; | |
422 | if (sr_modbus_error_check(reply)) | |
423 | return SR_ERR_DATA; | |
f54ebe0c | 424 | if (reply[0] != request[0] || R8(reply + 1) != (uint8_t)((nb_coils + 7) / 8)) |
daa39012 | 425 | return SR_ERR_DATA; |
f54ebe0c | 426 | memcpy(coils, reply + 2, (nb_coils + 7) / 8); |
daa39012 AJ |
427 | } |
428 | ||
429 | return SR_OK; | |
430 | } | |
431 | ||
432 | /** | |
ae1827f5 | 433 | * Send a Modbus read holding registers command and receive the corresponding |
daa39012 AJ |
434 | * registers values. |
435 | * | |
ae1827f5 UH |
436 | * @param modbus Previously initialized Modbus device structure. |
437 | * @param address The Modbus address of the first register to read, or -1 to | |
f54ebe0c UH |
438 | * read the reply of a previouly sent read registers command. |
439 | * @param nb_registers The number of registers to read. | |
440 | * @param registers Buffer to store all the received registers values, | |
daa39012 AJ |
441 | * or NULL to send the read holding registers command |
442 | * without reading the reply. | |
443 | * | |
444 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, | |
445 | * SR_ERR_DATA upon invalid data, or SR_ERR on failure. | |
446 | */ | |
447 | SR_PRIV int sr_modbus_read_holding_registers(struct sr_modbus_dev_inst *modbus, | |
448 | int address, int nb_registers, uint16_t *registers) | |
449 | { | |
f54ebe0c | 450 | uint8_t request[5], reply[2 + (2 * nb_registers)]; |
daa39012 AJ |
451 | int ret; |
452 | ||
453 | if (address < -1 || address > 0xFFFF | |
454 | || nb_registers < 1 || nb_registers > 125) | |
455 | return SR_ERR_ARG; | |
456 | ||
f54ebe0c UH |
457 | W8(request + 0, MODBUS_READ_HOLDING_REGISTERS); |
458 | WB16(request + 1, address); | |
459 | WB16(request + 3, nb_registers); | |
daa39012 AJ |
460 | |
461 | if (address >= 0) { | |
462 | ret = sr_modbus_request(modbus, request, sizeof(request)); | |
463 | if (ret != SR_OK) | |
464 | return ret; | |
465 | } | |
466 | ||
467 | if (registers) { | |
468 | ret = sr_modbus_reply(modbus, reply, sizeof(reply)); | |
469 | if (ret != SR_OK) | |
470 | return ret; | |
471 | if (sr_modbus_error_check(reply)) | |
472 | return SR_ERR_DATA; | |
f54ebe0c | 473 | if (reply[0] != request[0] || R8(reply + 1) != (uint8_t)(2 * nb_registers)) |
daa39012 | 474 | return SR_ERR_DATA; |
f54ebe0c | 475 | memcpy(registers, reply + 2, 2 * nb_registers); |
daa39012 AJ |
476 | } |
477 | ||
478 | return SR_OK; | |
479 | } | |
480 | ||
481 | /** | |
ae1827f5 | 482 | * Send a Modbus write coil command. |
daa39012 | 483 | * |
ae1827f5 UH |
484 | * @param modbus Previously initialized Modbus device structure. |
485 | * @param address The Modbus address of the coil to write. | |
f54ebe0c | 486 | * @param value The new value to assign to this coil. |
daa39012 AJ |
487 | * |
488 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, | |
489 | * SR_ERR_DATA upon invalid data, or SR_ERR on failure. | |
490 | */ | |
491 | SR_PRIV int sr_modbus_write_coil(struct sr_modbus_dev_inst *modbus, | |
492 | int address, int value) | |
493 | { | |
494 | uint8_t request[5], reply[5]; | |
495 | int ret; | |
496 | ||
497 | if (address < 0 || address > 0xFFFF) | |
498 | return SR_ERR_ARG; | |
499 | ||
f54ebe0c UH |
500 | W8(request + 0, MODBUS_WRITE_COIL); |
501 | WB16(request + 1, address); | |
502 | WB16(request + 3, value ? 0xFF00 : 0); | |
daa39012 AJ |
503 | |
504 | ret = sr_modbus_request_reply(modbus, request, sizeof(request), | |
f54ebe0c | 505 | reply, sizeof(reply)); |
daa39012 AJ |
506 | if (ret != SR_OK) |
507 | return ret; | |
508 | if (sr_modbus_error_check(reply)) | |
509 | return SR_ERR_DATA; | |
510 | if (memcmp(request, reply, sizeof(reply))) | |
511 | return SR_ERR_DATA; | |
f54ebe0c | 512 | |
daa39012 AJ |
513 | return SR_OK; |
514 | } | |
515 | ||
516 | /** | |
ae1827f5 | 517 | * Send a Modbus write multiple registers command. |
daa39012 | 518 | * |
ae1827f5 UH |
519 | * @param modbus Previously initialized Modbus device structure. |
520 | * @param address The Modbus address of the first register to write. | |
f54ebe0c UH |
521 | * @param nb_registers The number of registers to write. |
522 | * @param registers Buffer holding all the registers values to write. | |
daa39012 AJ |
523 | * |
524 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, | |
525 | * SR_ERR_DATA upon invalid data, or SR_ERR on failure. | |
526 | */ | |
527 | SR_PRIV int sr_modbus_write_multiple_registers(struct sr_modbus_dev_inst*modbus, | |
528 | int address, int nb_registers, uint16_t *registers) | |
529 | { | |
f54ebe0c | 530 | uint8_t request[6 + (2 * nb_registers)], reply[5]; |
daa39012 AJ |
531 | int ret; |
532 | ||
533 | if (address < 0 || address > 0xFFFF | |
534 | || nb_registers < 1 || nb_registers > 123 || !registers) | |
535 | return SR_ERR_ARG; | |
536 | ||
f54ebe0c UH |
537 | W8(request + 0, MODBUS_WRITE_MULTIPLE_REGISTERS); |
538 | WB16(request + 1, address); | |
539 | WB16(request + 3, nb_registers); | |
540 | W8(request + 5, 2 * nb_registers); | |
541 | memcpy(request + 6, registers, 2 * nb_registers); | |
daa39012 AJ |
542 | |
543 | ret = sr_modbus_request_reply(modbus, request, sizeof(request), | |
f54ebe0c | 544 | reply, sizeof(reply)); |
daa39012 AJ |
545 | if (ret != SR_OK) |
546 | return ret; | |
547 | if (sr_modbus_error_check(reply)) | |
548 | return SR_ERR_DATA; | |
549 | if (memcmp(request, reply, sizeof(reply))) | |
550 | return SR_ERR_DATA; | |
f54ebe0c | 551 | |
daa39012 AJ |
552 | return SR_OK; |
553 | } | |
554 | ||
555 | /** | |
ae1827f5 | 556 | * Close Modbus device. |
daa39012 | 557 | * |
ae1827f5 | 558 | * @param modbus Previously initialized Modbus device structure. |
daa39012 AJ |
559 | * |
560 | * @return SR_OK on success, SR_ERR on failure. | |
561 | */ | |
562 | SR_PRIV int sr_modbus_close(struct sr_modbus_dev_inst *modbus) | |
563 | { | |
564 | return modbus->close(modbus->priv); | |
565 | } | |
566 | ||
567 | /** | |
ae1827f5 | 568 | * Free Modbus device. |
daa39012 | 569 | * |
ae1827f5 | 570 | * @param modbus Previously initialized Modbus device structure. |
daa39012 AJ |
571 | * |
572 | * @return SR_OK on success, SR_ERR on failure. | |
573 | */ | |
574 | SR_PRIV void sr_modbus_free(struct sr_modbus_dev_inst *modbus) | |
575 | { | |
576 | modbus->free(modbus->priv); | |
577 | g_free(modbus->priv); | |
578 | g_free(modbus); | |
579 | } |