2 * This file is part of the libsigrok project.
4 * Copyright (C) 2013 Matthias Heidbrink <m-sigrok@heidbrink.biz>
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.
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.
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/>.
23 /* Serial communication parameters for Metrahit 1x/2x with 'RS232' adaptor */
24 #define SERIALCOMM_1X_RS232 "8228/6n1/dtr=1/rts=1/flow=0" /* =8192, closer with divider */
25 #define SERIALCOMM_2X_RS232 "9600/6n1/dtr=1/rts=1/flow=0"
26 #define VENDOR_GMC "Gossen Metrawatt"
28 SR_PRIV struct sr_dev_driver gmc_mh_1x_2x_rs232_driver_info;
30 static const int32_t hwopts[] = {
35 static const int32_t hwcaps[] = {
37 SR_CONF_LIMIT_SAMPLES,
42 static int init_1x_2x_rs232(struct sr_context *sr_ctx)
44 return std_init(sr_ctx, &gmc_mh_1x_2x_rs232_driver_info, LOG_PREFIX);
48 * Read single byte from serial port.
50 * @retval -1 Timeout or error.
53 static int read_byte(struct sr_serial_dev_inst *serial, gint64 timeout)
59 rc = serial_read(serial, &result, 1);
61 sr_spew("read: 0x%02x/%d", result, result);
64 if (g_get_monotonic_time() > timeout)
71 * Try to detect GMC 1x/2x multimeter model in send mode for max. 1 second.
73 * @param serial Configured, open serial port.
75 * @retval NULL Detection failed.
76 * @retval other Model code.
78 static enum model scan_model_sm(struct sr_serial_dev_inst *serial)
80 int byte, bytecnt, cnt;
84 model = SR_METRAHIT_NONE;
85 timeout_us = g_get_monotonic_time() + 1 * 1000 * 1000;
88 * Try to find message consisting of device code and several
89 * (at least 4) data bytes.
91 for (bytecnt = 0; bytecnt < 100; bytecnt++) {
92 byte = read_byte(serial, timeout_us);
93 if ((byte == -1) || (timeout_us < g_get_monotonic_time()))
95 if ((byte & MSGID_MASK) == MSGID_INF) {
96 if (!(model = sr_gmc_decode_model_sm(byte & MSGC_MASK)))
98 /* Now expect (at least) 4 data bytes. */
99 for (cnt = 0; cnt < 4; cnt++) {
100 byte = read_byte(serial, timeout_us);
102 ((byte & MSGID_MASK) != MSGID_DATA))
104 model = SR_METRAHIT_NONE;
117 * Scan for Metrahit 1x and Metrahit 2x in send mode using Gossen Metrawatt
120 * The older 1x models use 8192 baud and the newer 2x 9600 baud.
121 * The DMM usually sends up to about 20 messages per second. However, depending
122 * on configuration and measurement mode the intervals can be much larger and
123 * then the detection might not work.
125 static GSList *scan_1x_2x_rs232(GSList *options)
127 struct sr_dev_inst *sdi;
128 struct drv_context *drvc;
129 struct dev_context *devc;
130 struct sr_config *src;
131 struct sr_probe *probe;
132 struct sr_serial_dev_inst *serial;
134 const char *conn, *serialcomm;
136 gboolean serialcomm_given;
140 drvc = (&gmc_mh_1x_2x_rs232_driver_info)->priv;
141 drvc->instances = NULL;
142 conn = serialcomm = NULL;
143 model = SR_METRAHIT_NONE;
144 serialcomm_given = FALSE;
146 sr_spew("scan_1x_2x_rs232() called!");
148 for (l = options; l; l = l->next) {
152 conn = g_variant_get_string(src->data, NULL);
154 case SR_CONF_SERIALCOMM:
155 serialcomm = g_variant_get_string(src->data, NULL);
156 serialcomm_given = TRUE;
163 serialcomm = SERIALCOMM_2X_RS232;
165 if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
168 if (serial_open(serial, SERIAL_RDWR | SERIAL_NONBLOCK) != SR_OK) {
169 sr_serial_dev_inst_free(serial);
173 serial_flush(serial);
175 model = scan_model_sm(serial);
178 * If detection failed and no user-supplied parameters,
179 * try second baud rate.
181 if ((model == SR_METRAHIT_NONE) && !serialcomm_given) {
182 serialcomm = SERIALCOMM_1X_RS232;
183 g_free(serial->serialcomm);
184 serial->serialcomm = g_strdup(serialcomm);
185 if (serial_set_paramstr(serial, serialcomm) == SR_OK) {
186 serial_flush(serial);
187 model = scan_model_sm(serial);
191 if (model != SR_METRAHIT_NONE) {
192 sr_spew("%s %s detected!", VENDOR_GMC, sr_gmc_model_str(model));
193 if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, VENDOR_GMC,
194 sr_gmc_model_str(model), "")))
196 if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
197 sr_err("Device context malloc failed.");
201 devc->limit_samples = 0;
202 devc->limit_msec = 0;
203 devc->num_samples = 0;
204 devc->elapsed_msec = g_timer_new();
205 devc->settings_ok = FALSE;
209 sdi->driver = &gmc_mh_1x_2x_rs232_driver_info;
210 if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
212 sdi->probes = g_slist_append(sdi->probes, probe);
213 drvc->instances = g_slist_append(drvc->instances, sdi);
214 devices = g_slist_append(devices, sdi);
220 static GSList *dev_list_1x_2x_rs232(void)
222 return ((struct drv_context *)(gmc_mh_1x_2x_rs232_driver_info.priv))
226 static int dev_clear_1x_2x_rs232(void)
228 return std_dev_clear(&gmc_mh_1x_2x_rs232_driver_info, NULL);
231 static int dev_close(struct sr_dev_inst *sdi)
233 struct dev_context *devc;
235 std_serial_dev_close(sdi);
237 sdi->status = SR_ST_INACTIVE;
239 /* Free dynamically allocated resources. */
240 if ((devc = sdi->priv) && devc->elapsed_msec) {
241 g_timer_destroy(devc->elapsed_msec);
242 devc->elapsed_msec = NULL;
243 devc->model = SR_METRAHIT_NONE;
249 static int cleanup_sm_rs232(void)
251 return dev_clear_1x_2x_rs232();
255 static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi,
256 const struct sr_probe_group *probe_group)
274 static int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi,
275 const struct sr_probe_group *probe_group)
277 struct dev_context *devc;
281 if (sdi->status != SR_ST_ACTIVE)
282 return SR_ERR_DEV_CLOSED;
284 if (!(devc = sdi->priv)) {
285 sr_err("sdi->priv was NULL.");
290 case SR_CONF_LIMIT_MSEC:
291 if (g_variant_get_uint64(data) == 0) {
292 sr_err("LIMIT_MSEC can't be 0.");
295 devc->limit_msec = g_variant_get_uint64(data);
296 sr_dbg("Setting time limit to %" PRIu64 "ms.",
299 case SR_CONF_LIMIT_SAMPLES:
300 devc->limit_samples = g_variant_get_uint64(data);
301 sr_dbg("Setting sample limit to %" PRIu64 ".",
302 devc->limit_samples);
311 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi,
312 const struct sr_probe_group *probe_group)
317 case SR_CONF_SCAN_OPTIONS:
318 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
319 hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
321 case SR_CONF_DEVICE_OPTIONS:
322 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
323 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
332 static int dev_acq_start_1x_2x_rs232(const struct sr_dev_inst *sdi,
335 struct dev_context *devc;
336 struct sr_serial_dev_inst *serial;
338 if (!sdi || !cb_data || !(devc = sdi->priv))
341 if (sdi->status != SR_ST_ACTIVE)
342 return SR_ERR_DEV_CLOSED;
344 devc->cb_data = cb_data;
345 devc->settings_ok = FALSE;
348 /* Send header packet to the session bus. */
349 std_session_send_df_header(cb_data, LOG_PREFIX);
351 /* Start timer, if required. */
352 if (devc->limit_msec)
353 g_timer_start(devc->elapsed_msec);
355 /* Poll every 40ms, or whenever some data comes in. */
357 serial_source_add(serial, G_IO_IN, 40, gmc_mh_1x_2x_receive_data,
363 static int dev_acq_stop(struct sr_dev_inst *sdi, void *cb_data)
365 struct dev_context *devc;
367 /* Stop timer, if required. */
368 if (sdi && (devc = sdi->priv) && devc->limit_msec)
369 g_timer_stop(devc->elapsed_msec);
371 return std_serial_dev_acquisition_stop(sdi, cb_data, dev_close,
372 sdi->conn, LOG_PREFIX);
375 SR_PRIV struct sr_dev_driver gmc_mh_1x_2x_rs232_driver_info = {
376 .name = "gmc-mh-1x-2x-rs232",
378 "Gossen Metrawatt Metrahit 1x/2x DMMs, 'RS232' Interface",
380 .init = init_1x_2x_rs232,
381 .cleanup = cleanup_sm_rs232,
382 .scan = scan_1x_2x_rs232,
383 .dev_list = dev_list_1x_2x_rs232,
384 .dev_clear = dev_clear_1x_2x_rs232,
385 .config_get = config_get,
386 .config_set = config_set,
387 .config_list = config_list,
388 .dev_open = std_serial_dev_open,
389 .dev_close = dev_close,
390 .dev_acquisition_start = dev_acq_start_1x_2x_rs232,
391 .dev_acquisition_stop = dev_acq_stop,