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