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