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gmc_mh_1x_2x: Completed driver for Metrahit 1x/2x 

This driver supports devices with “RS232“ interface (Metrahit 16I,
18S, Siemens B1105 tested, 29S incomplete).
This commit is contained in:
Matthias Heidbrink 2013-11-21 15:47:09 +01:00 committed by Bert Vermeulen
parent 367983a744
commit f57924179d
3 changed files with 1279 additions and 65 deletions
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332
hardware/gmc-mh-1x-2x/api.c
View File

@ -17,48 +17,215 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include "protocol.h"
SR_PRIV struct sr_dev_driver gmc_mh_1x_2x_rs232_driver_info;
static struct sr_dev_driver *di = &gmc_mh_1x_2x_rs232_driver_info;
/* Serial communication parameters for Metrahit 1x/2x with 'RS232' adaptor */
#define SERIALCOMM_1X_RS232 "8228/6n1/dtr=1/rts=1/flow=0" /* =8192, closer with divider */
#define SERIALCOMM_2X_RS232 "9600/6n1/dtr=1/rts=1/flow=0"
#define VENDOR_GMC "Gossen Metrawatt"
static int init(struct sr_context *sr_ctx)
SR_PRIV struct sr_dev_driver gmc_mh_1x_2x_rs232_driver_info;
static const int32_t hwopts[] = {
SR_CONF_CONN,
SR_CONF_SERIALCOMM,
};
static const int32_t hwcaps[] = {
SR_CONF_MULTIMETER,
SR_CONF_LIMIT_SAMPLES,
SR_CONF_LIMIT_MSEC,
SR_CONF_CONTINUOUS,
};
/** Driver init function */
static int init_1x_2x_rs232(struct sr_context *sr_ctx)
{
return std_init(sr_ctx, di, LOG_PREFIX);
return std_init(sr_ctx, &gmc_mh_1x_2x_rs232_driver_info, LOG_PREFIX);
}
static GSList *scan(GSList *options)
{
struct drv_context *drvc;
GSList *devices;
(void)options;
/** Read single byte from serial port.
* \retval -1 Timeout or error.
* \retval other Byte.
*/
static int read_byte(struct sr_serial_dev_inst *serial, gint64 timeout)
{
guint8 result = 0;
int rc = 0;
for (;;) {
rc = serial_read(serial, &result, 1);
if (rc == 1) {
sr_spew("read: 0x%02x/%d", result, result);
return result;
}
if (g_get_monotonic_time() > timeout)
return -1;
g_usleep(2000);
}
}
/** Try to detect GMC 1x/2x multimeter model in send mode for max. 1 second.
* \param serial Configured, open serial port.
*
* \retval NULL Detection failed.
* \retval other Model code.
*/
static enum model scan_model_sm(struct sr_serial_dev_inst *serial)
{
int byte, bytecnt, cnt;
enum model model;
gint64 timeout_us;
model = SR_METRAHIT_NONE;
timeout_us = g_get_monotonic_time() + 1*1000*1000;
/* Try to find message consisting of device code and several
* (at least 4) data bytes. */
for (bytecnt = 0; bytecnt < 100; bytecnt++) {
byte = read_byte(serial, timeout_us);
if ((byte == -1) || (timeout_us < g_get_monotonic_time()))
break;
if ((byte & MSGID_MASK) == MSGID_INF) {
if (!(model = sr_gmc_decode_model_sm(byte & MSGC_MASK)))
break;
/* Now expect (at least) 4 data bytes */
for (cnt = 0; cnt < 4; cnt++) {
byte = read_byte(serial, timeout_us);
if ((byte == -1) ||
((byte & MSGID_MASK) != MSGID_DATA))
{
model = SR_METRAHIT_NONE;
bytecnt = 100;
break;
}
}
break;
}
}
return model;
}
/** Scan for Metrahit 1x and Metrahit 2x in send mode using Gossen Metrawatt
* 'RS232' interface. The older 1x models use 8192 and the newer 2x 9600 baud.
* The DMM usually sends up to about 20 messages per second. However, depending
* on configuration and measurement mode the intervals can be much larger and
* then the detection might not work.
*/
static GSList *scan_1x_2x_rs232(GSList *options)
{
struct sr_dev_inst *sdi;
struct drv_context *drvc;
struct dev_context *devc;
struct sr_config *src;
struct sr_probe *probe;
struct sr_serial_dev_inst *serial;
GSList *l, *devices;
const char *conn, *serialcomm;
enum model model;
gboolean serialcomm_given;
int cnt;
devices = NULL;
drvc = di->priv;
drvc = (&gmc_mh_1x_2x_rs232_driver_info)->priv;
drvc->instances = NULL;
conn = serialcomm = NULL;
model = SR_METRAHIT_NONE;
serialcomm_given = FALSE;
/* TODO: scan for devices, either based on a SR_CONF_CONN option
* or on a USB scan. */
sr_spew("scan_1x_2x_rs232() called!");
for (l = options; l; l = l->next) {
src = l->data;
switch (src->key) {
case SR_CONF_CONN:
conn = g_variant_get_string(src->data, NULL);
break;
case SR_CONF_SERIALCOMM:
serialcomm = g_variant_get_string(src->data, NULL);
serialcomm_given = TRUE;
break;
}
}
if (!conn)
return NULL;
if (!serialcomm)
serialcomm = SERIALCOMM_2X_RS232;
if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
return NULL;
if (serial_open(serial, SERIAL_RDWR | SERIAL_NONBLOCK) != SR_OK) {
sr_serial_dev_inst_free(serial);
return NULL;
}
serial_flush(serial);
model = scan_model_sm(serial);
/* If detection failed and no user-supplied parameters,
* try second baud rate. */
if ((model == SR_METRAHIT_NONE) && !serialcomm_given) {
serialcomm = SERIALCOMM_1X_RS232;
g_free(serial->serialcomm);
serial->serialcomm = g_strdup(serialcomm);
if (serial_set_paramstr(serial, serialcomm) == SR_OK) {
serial_flush(serial);
model = scan_model_sm(serial);
}
}
if (model != SR_METRAHIT_NONE) {
sr_spew("%s %s detected!", VENDOR_GMC, sr_gmc_model_str(model));
if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, VENDOR_GMC,
sr_gmc_model_str(model), "")))
return NULL;
if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
sr_err("Device context malloc failed.");
return NULL;
}
devc->model = model;
devc->limit_samples = 0;
devc->limit_msec = 0;
devc->num_samples = 0;
devc->elapsed_msec = g_timer_new();
devc->settings_ok = FALSE;
sdi->conn = serial;
sdi->priv = devc;
sdi->driver = &gmc_mh_1x_2x_rs232_driver_info;
if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
return NULL;
sdi->probes = g_slist_append(sdi->probes, probe);
drvc->instances = g_slist_append(drvc->instances, sdi);
devices = g_slist_append(devices, sdi);
}
return devices;
}
static GSList *dev_list(void)
/** Driver device list function */
static GSList *dev_list_1x_2x_rs232(void)
{
return ((struct drv_context *)(di->priv))->instances;
return ((struct drv_context *)(gmc_mh_1x_2x_rs232_driver_info.priv))
->instances;
}
static int dev_clear(void)
static int dev_clear_1x_2x_rs232(void)
{
return std_dev_clear(di, NULL);
return std_dev_clear(&gmc_mh_1x_2x_rs232_driver_info, NULL);
}
static int dev_open(struct sr_dev_inst *sdi)
{
(void)sdi;
/* TODO: get handle from sdi->conn and open it. */
struct sr_serial_dev_inst *serial = sdi->conn;
if (serial_open(serial, SERIAL_RDWR | SERIAL_NONBLOCK) != SR_OK)
return SR_ERR;
sdi->status = SR_ST_ACTIVE;
@ -67,24 +234,33 @@ static int dev_open(struct sr_dev_inst *sdi)
static int dev_close(struct sr_dev_inst *sdi)
{
(void)sdi;
struct sr_serial_dev_inst *serial;
struct dev_context *devc;
/* TODO: get handle from sdi->conn and close it. */
serial = sdi->conn;
if (serial && serial->fd != -1) {
serial_close(serial);
sdi->status = SR_ST_INACTIVE;
}
sdi->status = SR_ST_INACTIVE;
/* Free dynamically allocated resources. */
if ((devc = sdi->priv) && devc->elapsed_msec) {
g_timer_destroy(devc->elapsed_msec);
devc->elapsed_msec = NULL;
devc->model = SR_METRAHIT_NONE;
}
return SR_OK;
}
static int cleanup(void)
static int cleanup_sm_rs232(void)
{
dev_clear();
/* TODO: free other driver resources, if any. */
return SR_OK;
return dev_clear_1x_2x_rs232();
}
/** TODO */
static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi,
const struct sr_probe_group *probe_group)
{
@ -107,68 +283,102 @@ static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi,
static int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi,
const struct sr_probe_group *probe_group)
{
int ret;
struct dev_context *devc;
(void)data;
(void)probe_group;
if (sdi->status != SR_ST_ACTIVE)
return SR_ERR_DEV_CLOSED;
ret = SR_OK;
switch (key) {
/* TODO */
default:
ret = SR_ERR_NA;
if (!(devc = sdi->priv)) {
sr_err("sdi->priv was NULL.");
return SR_ERR_BUG;
}
return ret;
switch (key) {
case SR_CONF_LIMIT_MSEC:
if (g_variant_get_uint64(data) == 0) {
sr_err("LIMIT_MSEC can't be 0.");
return SR_ERR;
}
devc->limit_msec = g_variant_get_uint64(data);
sr_dbg("Setting time limit to %" PRIu64 "ms.",
devc->limit_msec);
break;
case SR_CONF_LIMIT_SAMPLES:
devc->limit_samples = g_variant_get_uint64(data);
sr_dbg("Setting sample limit to %" PRIu64 ".",
devc->limit_samples);
break;
default:
return SR_ERR_NA;
}
return SR_OK;
}
static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi,
const struct sr_probe_group *probe_group)
{
int ret;
(void)sdi;
(void)data;
(void)probe_group;
ret = SR_OK;
switch (key) {
/* TODO */
case SR_CONF_SCAN_OPTIONS:
*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
break;
case SR_CONF_DEVICE_OPTIONS:
*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
break;
default:
return SR_ERR_NA;
}
return ret;
return SR_OK;
}
static int dev_acquisition_start(const struct sr_dev_inst *sdi,
static int dev_acq_start_1x_2x_rs232(const struct sr_dev_inst *sdi,
void *cb_data)
{
(void)sdi;
(void)cb_data;
struct dev_context *devc;
struct sr_serial_dev_inst *serial;
if (!sdi || !cb_data || !(devc = sdi->priv))
return SR_ERR_BUG;
if (sdi->status != SR_ST_ACTIVE)
return SR_ERR_DEV_CLOSED;
/* TODO: configure hardware, reset acquisition state, set up
* callbacks and send header packet. */
devc->cb_data = cb_data;
devc->settings_ok = FALSE;
devc->buflen = 0;
/* Send header packet to the session bus. */
std_session_send_df_header(cb_data, LOG_PREFIX);
/* Start timer, if required. */
if (devc->limit_msec)
g_timer_start(devc->elapsed_msec);
/* Poll every 40ms, or whenever some data comes in. */
serial = sdi->conn;
sr_source_add(serial->fd, G_IO_IN, 40, gmc_mh_1x_2x_receive_data,
(void *)sdi);
return SR_OK;
}
static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
static int dev_acq_stop(struct sr_dev_inst *sdi, void *cb_data)
{
(void)cb_data;
struct dev_context *devc;
if (sdi->status != SR_ST_ACTIVE)
return SR_ERR_DEV_CLOSED;
/* Stop timer, if required. */
if (sdi && (devc = sdi->priv) && devc->limit_msec)
g_timer_stop(devc->elapsed_msec);
/* TODO: stop acquisition. */
return SR_OK;
return std_dev_acquisition_stop_serial(sdi, cb_data, dev_close,
sdi->conn, LOG_PREFIX);
}
SR_PRIV struct sr_dev_driver gmc_mh_1x_2x_rs232_driver_info = {
@ -176,17 +386,17 @@ SR_PRIV struct sr_dev_driver gmc_mh_1x_2x_rs232_driver_info = {
.longname =
"Gossen Metrawatt Metrahit 1x/2x DMMs, 'RS232' Interface",
.api_version = 1,
.init = init,
.cleanup = cleanup,
.scan = scan,
.dev_list = dev_list,
.dev_clear = dev_clear,
.init = init_1x_2x_rs232,
.cleanup = cleanup_sm_rs232,
.scan = scan_1x_2x_rs232,
.dev_list = dev_list_1x_2x_rs232,
.dev_clear = dev_clear_1x_2x_rs232,
.config_get = config_get,
.config_set = config_set,
.config_list = config_list,
.dev_open = dev_open,
.dev_close = dev_close,
.dev_acquisition_start = dev_acquisition_start,
.dev_acquisition_stop = dev_acquisition_stop,
.dev_acquisition_start = dev_acq_start_1x_2x_rs232,
.dev_acquisition_stop = dev_acq_stop,
.priv = NULL,
};

927
hardware/gmc-mh-1x-2x/protocol.c
View File

@ -17,12 +17,762 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <math.h>
#include <string.h>
#include "protocol.h"
/** Set or clear flags in devc->mqflags. */
static void setmqf(struct dev_context *devc, uint64_t flags, gboolean set)
{
if (set)
devc->mqflags |= flags;
else
devc->mqflags &= ~flags;
}
/** Decode current type and measured value, Metrahit 12-16.
*/
static void decode_ctmv_16(guchar ctmv, struct dev_context *devc)
{
devc->mq = 0;
devc->unit = 0;
devc->mqflags = 0;
switch (ctmv) {
case 0x00: /* 0000 - */
break;
case 0x01: /* 0001 mV DC */
devc->scale1000 = -1; /* Fall through */
case 0x02: /* 0010 V DC */
case 0x03: /* 0011 V AC+DC */
case 0x04: /* 0100 V AC */
devc->mq = SR_MQ_VOLTAGE;
devc->unit = SR_UNIT_VOLT;
if (ctmv <= 0x03)
devc->mqflags |= SR_MQFLAG_DC;
if (ctmv >= 0x03) {
devc->mqflags |= SR_MQFLAG_AC;
if (devc->model >= SR_METRAHIT_16S)
devc->mqflags |= SR_MQFLAG_RMS;
}
break;
case 0x05: /* 0101 Hz (15S/16S only) */
case 0x06: /* 0110 kHz (15S/16S only) */
devc->mq = SR_MQ_FREQUENCY;
devc->unit = SR_UNIT_HERTZ;
if (ctmv == 0x06)
devc->scale1000 = 1;
break;
case 0x07: /* 0111 % (15S/16S only) */
devc->mq = SR_MQ_DUTY_CYCLE;
devc->unit = SR_UNIT_PERCENTAGE;
break;
case 0x08: /* 1000 Diode */
devc->mq = SR_MQ_VOLTAGE;
devc->unit = SR_UNIT_VOLT;
devc->mqflags |= SR_MQFLAG_DIODE;
break;
case 0x09: /* 1001 Ohm, °C */
case 0x0a: /* 1010 kOhm */
case 0x0b: /* 1011 MOhm */
devc->mq = SR_MQ_RESISTANCE; /* Changed to temp. later if req.*/
devc->unit = SR_UNIT_OHM;
devc->scale1000 = ctmv - 0x09;
break;
case 0x0c: /* 1100 nF (15S/16S only) */
case 0x0d: /* 1101 µF (15S/16S only) */
devc->mq = SR_MQ_CAPACITANCE;
devc->unit = SR_UNIT_FARAD;
if (ctmv == 0x0c)
devc->scale1000 = -3;
else
devc->scale1000 = -2;
break;
case 0x0e: /* mA, µA */
devc->scale1000 = -1; /* Fall through. */
case 0x0f: /* A */
devc->mq = SR_MQ_CURRENT;
devc->unit = SR_UNIT_AMPERE;
if (devc->model == SR_METRAHIT_16S)
devc->mqflags |= SR_MQFLAG_RMS;
/* 16I A only with clamp, RMS questionable. */
break;
}
}
/** Decode range/sign/acdc byte special chars (Metrahit 12-16).
* \param[in] spc Special characters 1 and 2 (s1 | (s2<<4)).
*/
static void decode_rs_16(guchar rs, struct dev_context *devc)
{
sr_spew("decode_rs_16(%d) scale = %f", rs, devc->scale);
if (rs & 0x08) /* Sign */
devc->scale *= -1.0;
if (devc->mq == SR_MQ_CURRENT) {
if (rs & 0x04) /* Current is AC */
devc->mqflags |= SR_MQFLAG_AC;
else
devc->mqflags |= SR_MQFLAG_DC;
}
switch (rs & 0x03) {
case 0:
if (devc->mq == SR_MQ_VOLTAGE) /* V */
devc->scale *= 0.1;
else if (devc->mq == SR_MQ_CURRENT) /* 000.0 µA */
devc->scale *= 0.0000001; /* Untested! */
else if (devc->mq == SR_MQ_RESISTANCE) {
if (devc->buflen >= 10) {
/* °C with 10 byte msg type, otherwise GOhm. */
devc->mq = SR_MQ_TEMPERATURE;
devc->unit = SR_UNIT_CELSIUS;
devc->scale *= 0.01;
}
else if ((devc->scale1000 == 2)) {
/* 16I Iso 500/1000V 3 GOhm */
devc->scale *= 0.1;
}
}
break;
case 1:
devc->scale *= 0.0001;
break;
case 2:
devc->scale *= 0.001;
break;
case 3:
devc->scale *= 0.01;
break;
}
}
/** Decode special chars, Metrahit 12-16.
* \param[in] spc Special characters 1 and 2 (s1 | (s2<<4)).
*/
static void decode_spc_16(guchar spc, struct dev_context *devc)
{
/* xxxx1xxx ON */
/* TODO: What does that mean? Power on? The 16I sets this. */
/* xxxxx1xx BEEP */
/* xxxxxx1x Low battery */
/* xxxxxxx1 FUSE */
/* 1xxxxxxx MIN */
setmqf(devc, SR_MQFLAG_MIN, spc & 0x80);
/* x1xxxxxx MAN */
setmqf(devc, SR_MQFLAG_AUTORANGE, !(spc & 0x40));
/* xx1xxxxx DATA */
setmqf(devc, SR_MQFLAG_HOLD, spc & 0x20);
/* xxx1xxxx MAX */
setmqf(devc, SR_MQFLAG_MAX, spc & 0x10);
}
/** Decode current type and measured value, Metrahit 18.
*/
static void decode_ctmv_18(guchar ctmv, struct dev_context *devc)
{
devc->mq = 0;
devc->unit = 0;
devc->mqflags = 0;
switch (ctmv) {
case 0x00: /* 0000 - */
break;
case 0x01: /* 0001 V AC */
case 0x02: /* 0010 V AC+DC */
case 0x03: /* 0011 V DC */
devc->mq = SR_MQ_VOLTAGE;
devc->unit = SR_UNIT_VOLT;
if (ctmv <= 0x02)
devc->mqflags |= (SR_MQFLAG_AC | SR_MQFLAG_RMS);
if (ctmv >= 0x02)
devc->mqflags |= SR_MQFLAG_DC;
break;
case 0x04: /* 0100 Ohm/Ohm with buzzer */
devc->mq = SR_MQ_RESISTANCE;
devc->unit = SR_UNIT_OHM;
break;
case 0x05: /* 0101 Diode/Diode with buzzer*/
devc->mq = SR_MQ_VOLTAGE;
devc->unit = SR_UNIT_VOLT;
devc->mqflags |= SR_MQFLAG_DIODE;
break;
case 0x06: /* 0110 °C */
devc->mq = SR_MQ_TEMPERATURE;
devc->unit = SR_UNIT_CELSIUS;
break;
case 0x07: /* 0111 F */
devc->mq = SR_MQ_CAPACITANCE;
devc->unit = SR_UNIT_FARAD;
break;
case 0x08: /* 1000 mA DC */
case 0x09: /* 1001 A DC */
case 0x0a: /* 1010 mA AC+DC */
case 0x0b: /* 1011 A AC+DC */
devc->mq = SR_MQ_CURRENT;
devc->unit = SR_UNIT_AMPERE;
devc->mqflags |= SR_MQFLAG_DC;
if (ctmv >= 0x0a)
devc->mqflags |= (SR_MQFLAG_AC | SR_MQFLAG_RMS);
if ((ctmv == 0x08) || (ctmv == 0x0a))
devc->scale1000 = -1;
break;
case 0x0c: /* 1100 Hz */
devc->mq = SR_MQ_FREQUENCY;
devc->unit = SR_UNIT_HERTZ;
break;
case 0x0d: /* 1101 dB */
devc->mq = SR_MQ_VOLTAGE;
devc->unit = SR_UNIT_DECIBEL_VOLT;
devc->mqflags |= SR_MQFLAG_AC; /* dB available for AC only */
break;
case 0x0e: /* 1110 Events AC, Events AC+DC. Actually delivers just
* current voltage via IR, nothing more. */
devc->mq = SR_MQ_VOLTAGE;
devc->unit = SR_UNIT_VOLT;
devc->mqflags |= SR_MQFLAG_AC | SR_MQFLAG_DC | SR_MQFLAG_RMS;
break;
case 0x0f: /* 1111 Clock */
devc->mq = SR_MQ_TIME;
devc->unit = SR_UNIT_SECOND;
devc->mqflags |= SR_MQFLAG_DURATION;
break;
}
}
/** Decode range/sign/acdc byte special chars, Metrahit 18.
* \param[in] rs Rance/sign byte
*/
static void decode_rs_18(guchar rs, struct dev_context *devc)
{
int range;
/* Sign */
if (((devc->scale > 0) && (rs & 0x08)) ||
((devc->scale < 0) && !(rs & 0x08)))
devc->scale *= -1.0;
/* Range */
range = rs & 0x07;
switch (devc->mq) {
case SR_MQ_VOLTAGE:
if (devc->unit == SR_UNIT_DECIBEL_VOLT) {
devc->scale *= pow(10.0, -2);
/* When entering relative mode, the device switches
* from 10 byte to 6 byte msg format. Unfortunately
* it switches back to 10 byte when the second value
* is measured, so that's not sufficient to
* identify relative mode.
*/
}
else if (devc->vmains_29S)
devc->scale *= pow(10.0, range - 2);
else
devc->scale *= pow(10.0, range - 5);
break;
case SR_MQ_CURRENT:
if (devc->scale1000 == -1)
devc->scale *= pow(10.0, range - 5);
else
devc->scale *= pow(10.0, range - 4);
break;
case SR_MQ_RESISTANCE:
devc->scale *= pow(10.0, range - 2);
break;
case SR_MQ_FREQUENCY:
devc->scale *= pow(10.0, range - 3);
break;
case SR_MQ_TEMPERATURE:
devc->scale *= pow(10.0, range - 2);
break;
case SR_MQ_CAPACITANCE:
devc->scale *= pow(10.0, range - 14);
break;
/* TODO: 29S Mains measurements. */
}
}
/** Decode special chars, Metrahit 18.
* \param[in] spc Special characters 1 and 2 (s1 | (s2<<4)).
*/
static void decode_spc_18(guchar spc, struct dev_context *devc)
{
/* xxxx1xxx ZERO */
/* xxxxx1xx BEEP */
/* xxxxxx1x Low battery */
/* xxxxxxx1 Fuse */
if (devc->mq == SR_MQ_TIME) {
/* xxx1xxxx Clock running: 1; stop: 0 */
sr_spew("Clock running: %d", spc >> 4);
}
else {
/* 1xxxxxxx MAN */
setmqf(devc, SR_MQFLAG_AUTORANGE, !(spc & 0x80));
/* x1xxxxxx MIN */
setmqf(devc, SR_MQFLAG_MIN, spc & 0x40);
/* xx1xxxxx MAX */
setmqf(devc, SR_MQFLAG_MAX, spc & 0x20);
/* xxx1xxxx DATA */
setmqf(devc, SR_MQFLAG_HOLD, spc & 0x10);
}
}
/** Decode current type and measured value, Metrahit 2x.
* \param[in] ctmv Current type and measured value (v1 | (v2<<4)).
*/
static void decode_ctmv_2x(guchar ctmv, struct dev_context *devc)
{
if ((ctmv > 0x1c) || (!devc)) {
sr_err("decode_ct_mv_2x(%d): invalid param(s)!", ctmv);
return;
}
devc->mq = 0;
devc->unit = 0;
devc->mqflags = 0;
switch (ctmv) {
/* 00000 unused */
case 0x01: /* 00001 V DC */
case 0x02: /* 00010 V AC+DC */
case 0x03: /* 00011 V AC */
devc->mq = SR_MQ_VOLTAGE;
devc->unit = SR_UNIT_VOLT;
if (ctmv <= 0x02)
devc->mqflags |= SR_MQFLAG_DC;
if (ctmv >= 0x02) {
devc->mqflags |= SR_MQFLAG_AC;
if (devc->model >= SR_METRAHIT_24S)
devc->model |= SR_MQFLAG_RMS;
}
break;
case 0x04: /* 00100 mA DC */
case 0x05: /* 00101 mA AC+DC */
devc->scale1000 = -1;
case 0x06: /* 00110 A DC */
case 0x07: /* 00111 A AC+DC */
devc->mq = SR_MQ_CURRENT;
devc->unit = SR_UNIT_AMPERE;
devc->mqflags |= SR_MQFLAG_DC;
if ((ctmv == 0x05) || (ctmv == 0x07)) {
devc->mqflags |= SR_MQFLAG_AC;
if (devc->model >= SR_METRAHIT_24S)
devc->mqflags |= SR_MQFLAG_RMS;
}
break;
case 0x08: /* 01000 Ohm */
devc->mq = SR_MQ_RESISTANCE;
devc->unit = SR_UNIT_OHM;
break;
case 0x09: /* 01001 F */
devc->mq = SR_MQ_CAPACITANCE;
devc->unit = SR_UNIT_FARAD;
devc->scale *= 0.1;
break;
case 0x0a: /* 01010 dB */
devc->mq = SR_MQ_VOLTAGE;
devc->unit = SR_UNIT_DECIBEL_VOLT;
devc->mqflags |= SR_MQFLAG_AC;
break;
case 0x0b: /* 01011 Hz U ACDC */
case 0x0c: /* 01100 Hz U AC */
devc->mq = SR_MQ_FREQUENCY;
devc->unit = SR_UNIT_HERTZ;
devc->mqflags |= SR_MQFLAG_AC;
if (ctmv <= 0x0b)
devc->mqflags |= SR_MQFLAG_DC;
break;
case 0x0d: /* 01101 W on power, mA range (29S only) */
case 0x0e: /* 01110 W on power, A range (29S only) */
/* TODO: Differences between Send Mode and bidir protocol here */
devc->mq = SR_MQ_POWER;
devc->unit = SR_UNIT_WATT;
break;
case 0x0f: /* 01111 Diode */
case 0x10: /* 10000 Diode with buzzer (actually cont. with voltage) */
devc->unit = SR_UNIT_VOLT;
if (ctmv == 0x0f) {
devc->mq = SR_MQ_VOLTAGE;
devc->mqflags |= SR_MQFLAG_DIODE;
devc->scale *= 0.1;
}
else {
devc->mq = SR_MQ_CONTINUITY;
devc->scale *= 0.00001;
}
devc->unit = SR_UNIT_VOLT;
break;
case 0x11: /* 10001 Ohm with buzzer */
devc->mq = SR_MQ_CONTINUITY;
devc->unit = SR_UNIT_OHM;
devc->scale1000 = -1;
break;
case 0x12: /* 10010 Temperature */
devc->mq = SR_MQ_TEMPERATURE;
devc->unit = SR_UNIT_CELSIUS;
/* This can be Fahrenheit. That is detected by range=4 later. */
break;
/* 0x13 10011, 0x14 10100 unsed */
case 0x15: /* 10101 Press (29S only) */
/* TODO: What does that mean? Possibly phase shift?
Then we need a unit/flag for it. */
devc->mq = SR_MQ_GAIN;
devc->unit = SR_UNIT_PERCENTAGE;
break;
case 0x16: /* 10110 Pulse W (29S only) */
/* TODO: Own unit and flag for this! */
devc->mq = SR_MQ_POWER;
devc->unit = SR_UNIT_WATT;
break;
case 0x17: /* 10111 TRMS V on mains (29S only) */
devc->mq = SR_MQ_VOLTAGE;
devc->unit = SR_UNIT_VOLT;
devc->mqflags |= (SR_MQFLAG_AC | SR_MQFLAG_RMS);
devc->vmains_29S = TRUE;
break;
case 0x18: /* 11000 Counter (zero crossings of a signal) */
devc->mq = SR_MQ_VOLTAGE;
devc->unit = SR_UNIT_UNITLESS;
break;
case 0x19: /* 11001 Events U ACDC */
case 0x1a: /* 11010 Events U AC */
/* TODO: No unit or flags for this yet! */
devc->mq = SR_MQ_VOLTAGE;
devc->unit = SR_UNIT_UNITLESS;
devc->mqflags |= SR_MQFLAG_AC;
if (ctmv <= 0x19)
devc->mqflags |= SR_MQFLAG_DC;
break;
case 0x1b: /* 11011 pulse on mains (29S only) */
/* TODO: No unit or flags for this yet! */
devc->mq = SR_MQ_VOLTAGE;
devc->unit = SR_UNIT_UNITLESS;
devc->mqflags |= SR_MQFLAG_AC;
break;
case 0x1c: /* 11100 dropout on mains (29S only) */
/* TODO: No unit or flags for this yet! */
devc->mq = SR_MQ_VOLTAGE;
devc->unit = SR_UNIT_UNITLESS;
devc->mqflags |= SR_MQFLAG_AC;
break;
default:
sr_err("decode_ctmv_2x(%d, ...): Unknown ctmv!");
}
}
/** Decode range/sign/acdc byte special chars, Metrahit 2x.
* \param[in] rs Rance/sign byte
*/
static void decode_rs_2x(guchar rs, struct dev_context *devc)
{
int range;
/* Sign */
if (((devc->scale > 0) && (rs & 0x08)) ||
((devc->scale < 0) && !(rs & 0x08)))
devc->scale *= -1.0;
/* Range */
range = rs & 0x07;
switch (devc->mq) {
case SR_MQ_VOLTAGE:
if (devc->unit == SR_UNIT_DECIBEL_VOLT) {
devc->scale *= pow(10.0, -3);
}
else if (devc->vmains_29S)
devc->scale *= pow(10.0, range - 2);
else if(devc->mqflags & SR_MQFLAG_AC)
devc->scale *= pow(10.0, range - 6);
else /* "Undocumented feature": Between AC and DC
scaling differs by 1. */
devc->scale *= pow(10.0, range - 5);
break;
case SR_MQ_CURRENT:
if (devc->scale1000 == -1)
devc->scale *= pow(10.0, range - 5);
else
devc->scale *= pow(10.0, range - 4);
break;
case SR_MQ_RESISTANCE:
devc->scale *= pow(10.0, range - 3);
break;
case SR_MQ_FREQUENCY:
devc->scale *= pow(10.0, range - 3);
break;
case SR_MQ_TEMPERATURE:
if (range == 4) { /* Indicator for °F */
devc->unit = SR_UNIT_FAHRENHEIT;
}
devc->scale *= pow(10.0, - 2);
break;
case SR_MQ_CAPACITANCE:
devc->scale *= pow(10.0, range - 13);
break;
/* TODO: 29S Mains measurements. */
}
}
/** Decode special chars (Metrahit 2x).
* \param[in] spc Special characters 1 and 2 (s1 | (s2<<4)).
*/
static void decode_spc_2x(guchar spc, struct dev_context *devc)
{
/* xxxxxxx1 Fuse */
/* xxxxxx1x Low battery */
/* xxxxx1xx BEEP */
/* xxxx1xxx ZERO */
/* xxx1xxxx DATA */
setmqf(devc, SR_MQFLAG_HOLD, spc & 0x10);
/* x11xxxxx unused */
/* 1xxxxxxx MAN */
setmqf(devc, SR_MQFLAG_AUTORANGE, !(spc & 0x80));
}
/** Clean range and sign. */
static void clean_rs_v(struct dev_context *devc)
{
devc->value = 0.0;
devc->scale = 1.0;
}
/** Clean current type, measured variable, range and sign. */
static void clean_ctmv_rs_v(struct dev_context *devc)
{
devc->mq = 0;
devc->unit = 0;
devc->mqflags = 0;
devc->scale1000 = 0;
devc->vmains_29S = FALSE;
clean_rs_v(devc);
}
/** Send prepared value. */
static void send_value(struct sr_dev_inst *sdi)
{
struct dev_context *devc;
struct sr_datafeed_analog analog;
struct sr_datafeed_packet packet;
devc = sdi->priv;
memset(&analog, 0, sizeof(analog));
analog.probes = sdi->probes;
analog.num_samples = 1;
analog.mq = devc->mq;
analog.unit = devc->unit;
analog.mqflags = devc->mqflags;
analog.data = &devc->value;
memset(&packet, 0, sizeof(packet));
packet.type = SR_DF_ANALOG;
packet.payload = &analog;
sr_session_send(devc->cb_data, &packet);
devc->num_samples++;
}
/** Process 6-byte data message, Metrahit 1x/2x. */
static void process_msg_dta_6(struct sr_dev_inst *sdi)
{
struct dev_context *devc;
int cnt;
guchar dgt;
devc = sdi->priv;
clean_rs_v(devc);
/* Byte 0, range and sign */
if (devc->model <= SR_METRAHIT_16X) {
decode_rs_16(bc(devc->buf[0]), devc);
}
else if (devc->model < SR_METRAHIT_2X){
decode_rs_18(bc(devc->buf[0]), devc);
} else {
decode_rs_2x(bc(devc->buf[0]), devc);
}
/* Bytes 1-5, digits (ls first). */
for (cnt = 0; cnt < 5; cnt++) {
dgt = bc(devc->buf[1 + cnt]);
if (dgt >= 10) {
/* 10 Overload; on model <= 16X also 11 possible. */
devc->value = NAN;
devc->scale = 1.0;
break;
}
devc->value += pow(10.0, cnt) * dgt;
}
sr_spew("process_msg_dta_6() value=%f scale=%f scalet=%d",
devc->value, devc->scale, devc->scale1000);
if (devc->value != NAN)
devc->value *= devc->scale * pow(1000.0, devc->scale1000);
/* Create and send packet. */
send_value(sdi);
}
/** Process 5-byte info message, Metrahit 1x/2x. */
static void process_msg_inf_5(struct sr_dev_inst *sdi)
{
struct dev_context *devc;
enum model model;
devc = sdi->priv;
clean_ctmv_rs_v(devc);
/* Process byte 0 */
model = sr_gmc_decode_model_sm(bc(devc->buf[0]));
if (model != devc->model) {
sr_warn("Model mismatch in data: Detected %s, now %s",
sr_gmc_model_str(devc->model),
sr_gmc_model_str(model));
}
/* Process bytes 1-4 */
if (devc->model <= SR_METRAHIT_16X) {
decode_ctmv_16(bc(devc->buf[1]), devc);
decode_spc_16(bc(devc->buf[2]) | (bc(devc->buf[3]) << 4), devc);
decode_rs_16(bc(devc->buf[4]), devc);
}
else if (devc->model <= SR_METRAHIT_18S) {
decode_ctmv_18(bc(devc->buf[1]), devc);
decode_spc_18(bc(devc->buf[2]) | (bc(devc->buf[3]) << 4), devc);
decode_rs_18(bc(devc->buf[4]), devc);
}
else { /* Must be Metrahit 2x */
decode_ctmv_2x(bc(devc->buf[1]), devc);
decode_spc_2x(bc(devc->buf[2]) | (bc(devc->buf[3]) << 4), devc);
decode_rs_2x(bc(devc->buf[4]), devc);
}
}
/** Process 10-byte info/data message, Metrahit 15+. */
static void process_msg_inf_10(struct sr_dev_inst *sdi)
{
struct dev_context *devc;
int cnt;
guchar dgt;
devc = sdi->priv;
process_msg_inf_5(sdi);
/* Now decode numbers */
for (cnt = 0; cnt < 5; cnt++) {
dgt = bc(devc->buf[5 + cnt]);
if (dgt >= 10) { /* Overload */
devc->value = NAN;
devc->scale = 1.0;
break;
}
devc->value += pow(10.0, cnt) * dgt;
}
sr_spew("process_msg_inf_10() value=%f scale=%f scalet=%d",
devc->value, devc->scale, devc->scale1000);
if (devc->value != NAN)
devc->value *= devc->scale * pow(1000.0, devc->scale1000);
/* Create and send packet. */
send_value(sdi);
}
/** Decode send interval (Metrahit 2x only). */
static const char* decode_send_interval(guchar si)
{
switch (si) {
case 0x00: return "0.05";
case 0x01: return "0.1";
case 0x02: return "0.2";
case 0x03: return "0.5";
case 0x04: return "00:01";
case 0x05: return "00:02";
case 0x06: return "00:05";
case 0x07: return "00:10";
case 0x08: return "00:20";
case 0x09: return "00:30";
case 0x0a: return "01:00";
case 0x0b: return "02:00";
case 0x0c: return "05:00";
case 0x0d: return "10:00";
case 0x0e: return "----";
case 0x0f: return "data";
default: return "Unknown value";
}
}
/** Process 13-byte info/data message, Metrahit 2x. */
static void process_msg_inf_13(struct sr_dev_inst *sdi)
{
struct dev_context *devc;
enum model model;
int cnt;
guchar dgt;
devc = sdi->priv;
clean_ctmv_rs_v(devc);
/* Byte 0, model. */
model = sr_gmc_decode_model_sm(bc(devc->buf[0]));
if (model != devc->model) {
sr_warn("Model mismatch in data: Detected %s, now %s",
sr_gmc_model_str(devc->model),
sr_gmc_model_str(model));
}
/* Bytes 1-4, 11. */
decode_ctmv_2x(bc(devc->buf[1]) | (bc(devc->buf[11]) << 4), devc);
decode_spc_2x(bc(devc->buf[2]) | (bc(devc->buf[3]) << 4), devc);
decode_rs_2x(bc(devc->buf[4]), devc);
/* Bytes 5-10, digits (ls first). */
for (cnt = 0; cnt < 6; cnt++) {
dgt = bc(devc->buf[5 + cnt]);
if (dgt == 10) { /* Overload */
devc->value = NAN;
devc->scale = 1.0;
break;
}
devc->value += pow(10.0, cnt) * dgt;
}
sr_spew("process_msg_inf_13() value=%f scale=%f scale1000=%d mq=%d "
"unit=%d mqflags=0x%02llx", devc->value, devc->scale,
devc->scale1000, devc->mq, devc->unit, devc->mqflags);
if (devc->value != NAN)
devc->value *= devc->scale * pow(1000.0, devc->scale1000);
/* Byte 12, Send Interval */
sr_spew("Send interval: %s", decode_send_interval(bc(devc->buf[12])));
/* Create and send packet. */
send_value(sdi);
}
SR_PRIV int gmc_mh_1x_2x_receive_data(int fd, int revents, void *cb_data)
{
const struct sr_dev_inst *sdi;
struct sr_dev_inst *sdi;
struct dev_context *devc;
struct sr_serial_dev_inst *serial;
unsigned char buf, msgt;
int len;
(void)fd;
@ -32,9 +782,180 @@ SR_PRIV int gmc_mh_1x_2x_receive_data(int fd, int revents, void *cb_data)
if (!(devc = sdi->priv))
return TRUE;
if (revents == G_IO_IN) {
/* TODO */
serial = sdi->conn;
if (revents == G_IO_IN) { /* Serial data arrived. */
while (GMC_BUFSIZE - devc->buflen - 1 > 0) {
len = serial_read(serial, devc->buf + devc->buflen, 1);
if (len < 1)
break;
buf = *(devc->buf + devc->buflen);
sr_spew("read 0x%02x/%d/%d", buf, buf, buf & MSGC_MASK);
devc->buflen += len;
if (!devc->settings_ok) {
/* If no device type/settings record processed
* yet, wait for one. */
if ((devc->buf[0] & MSGID_MASK) != MSGID_INF) {
devc->buflen = 0;
continue;
}
devc->settings_ok = TRUE;
}
msgt = devc->buf[0] & MSGID_MASK;
switch (msgt) {
case MSGID_INF:
if (devc->buflen == 13) {
process_msg_inf_13(sdi);
devc->buflen = 0;
continue;
}
else if ((devc->buflen == 10) &&
(devc->model <= SR_METRAHIT_18S)) {
process_msg_inf_10(sdi);
devc->buflen = 0;
continue;
}
else if ((devc->buflen >= 5) &&
(devc->buf[devc->buflen-1] &
MSGID_MASK) != MSGID_DATA) {
/* Char just received is beginning
* of next message */
process_msg_inf_5(sdi);
devc->buf[0] =devc->buf[devc->buflen-1];
devc->buflen = 1;
continue;
}
break;
case MSGID_DTA:
case MSGID_D10:
if (devc->buflen == 6) {
process_msg_dta_6(sdi);
devc->buflen = 0;
}
break;
case MSGID_DATA:
sr_err("Comm error, unexpected data byte!");
devc->buflen = 0;
break;
}
}
}
/* If number of samples or time limit reached, stop aquisition. */
if (devc->limit_samples && (devc->num_samples >= devc->limit_samples)) {
sdi->driver->dev_acquisition_stop(sdi, cb_data);
}
if (devc->limit_msec) {
gdouble elapsed_s = g_timer_elapsed(devc->elapsed_msec, NULL);
if ((elapsed_s * 1000) >= devc->limit_msec) {
sdi->driver->dev_acquisition_stop(sdi, cb_data);
}
}
return TRUE;
}
/** Decode model in "send mode" */
SR_PRIV int sr_gmc_decode_model_sm(guchar mcode)
{
if (mcode > 0xf) {
sr_err("decode_model(%d): Model code 0..15 expected!", mcode);
return SR_METRAHIT_NONE;
}
switch(mcode) {
case 0x04: /* 0100b */
return SR_METRAHIT_12S;
case 0x08: /* 1000b */
return SR_METRAHIT_13S14A;
case 0x09: /* 1001b */
return SR_METRAHIT_14S;
case 0x0A: /* 1010b */
return SR_METRAHIT_15S;
case 0x0B: /* 1011b */
return SR_METRAHIT_16S;
case 0x06: /* 0110b (undocumented by GMC!) */
return SR_METRAHIT_16I;
case 0x0D: /* 1101b */
return SR_METRAHIT_18S;
case 0x02: /* 0010b */
return SR_METRAHIT_22SM;
case 0x03: /* 0011b */
return SR_METRAHIT_23S;
case 0x0f: /* 1111b */
return SR_METRAHIT_24S;
case 0x05: /* 0101b */
return SR_METRAHIT_25SM;
case 0x01: /* 0001b */
return SR_METRAHIT_26S;
case 0x0c: /* 1100b */
return SR_METRAHIT_28S;
case 0x0e: /* 1110b */
return SR_METRAHIT_29S;
default:
sr_err("Unknown model code %d!", mcode);
return SR_METRAHIT_NONE;
}
}
/** Decode model in bidirectional mode.
\param[in] mcode Model code.
\return Model code
*/
SR_PRIV int sr_gmc_decode_model_bidi(guchar mcode)
{
switch(mcode) {
case 2: return SR_METRAHIT_22SM;
case 3: return SR_METRAHIT_23S;
case 4: return SR_METRAHIT_24S;
case 5: return SR_METRAHIT_25SM;
case 1: return SR_METRAHIT_26S;
case 12: return SR_METRAHIT_28S;
case 14: return SR_METRAHIT_29S;
default:
sr_err("Unknown model code %d!", mcode);
return SR_METRAHIT_NONE;
}
}
SR_PRIV const char* sr_gmc_model_str(enum model mcode)
{
switch (mcode) {
case SR_METRAHIT_NONE:
return "-uninitialized model variable-";
case SR_METRAHIT_12S:
return "METRAHit 12S";
case SR_METRAHIT_13S14A:
return "METRAHit 13S/14A";
case SR_METRAHIT_14S:
return "METRAHit 14S";
case SR_METRAHIT_15S:
return "METRAHit 15S";
case SR_METRAHIT_16S:
return "METRAHit 16S";
case SR_METRAHIT_16I:
return "METRAHit 16I";
case SR_METRAHIT_18S:
return "METRAHit 18S";
case SR_METRAHIT_22SM:
return "METRAHit 22S/M";
case SR_METRAHIT_23S:
return "METRAHit 23S";
case SR_METRAHIT_24S:
return "METRAHit 24S";
case SR_METRAHIT_25SM:
return "METRAHit 25S/M";
case SR_METRAHIT_26S:
return "METRAHit 26S";
case SR_METRAHIT_28S:
return "METRAHit 28S";
case SR_METRAHIT_29S:
return "METRAHit 29S";
default:
return "Unknown model code";
}
}

85
hardware/gmc-mh-1x-2x/protocol.h
View File

@ -34,16 +34,99 @@
#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
#define GMC_BUFSIZE 266
/** Message ID bits 4, 5 */
#define MSGID_MASK 0x30 /**< Mask to get message ID bits */
#define MSGID_INF 0x00 /**< Start of message with device info */
#define MSGID_D10 0x10 /**< Start of data message, non-displayed intermediate */
#define MSGID_DTA 0x20 /**< Start of data message, displayed, averaged */
#define MSGID_DATA 0x30 /**< Data byte in message */
#define MSGC_MASK 0x0f /**< Mask to get message byte contents */
#define MSGSRC_MASK 0xc0 /**< Mask to get bits related to message source */
#define bc(x) (x & MSGC_MASK) /**< Get contents from a byte */
#define MASK_6BITS 0x3f /**< Mask lower six bits. */
/** Internal multimeter model codes. In opposite to the multimeter models from
* protocol (see decode_model()), these codes allow working with ranges.
*/
enum model {
SR_METRAHIT_NONE = 0, /**< Value for uninitialized variable */
SR_METRAHIT_12S = 12,
SR_METRAHIT_13S14A = 13,
SR_METRAHIT_14S = 14,
SR_METRAHIT_15S = 15,
SR_METRAHIT_16S = 16,
SR_METRAHIT_16I = 17,
SR_METRAHIT_16X = SR_METRAHIT_16I, /**< All Metrahit 16 */
/* A Metrahit 17 exists, but seems not to have an IR interface. */
SR_METRAHIT_18S = 18,
SR_METRAHIT_2X = 20, /**< For model type comparisons */
SR_METRAHIT_22SM = 22,
SR_METRAHIT_23S = 23,
SR_METRAHIT_24S = 24,
SR_METRAHIT_25SM = 25,
SR_METRAHIT_26S = 26,
SR_METRAHIT_28S = 28,
SR_METRAHIT_29S = 29,
};
/** Convert GMC model code in send mode to sigrok-internal one. */
SR_PRIV int sr_gmc_decode_model_sm(guchar mcode);
/** Convert GMC model code in bidirectional mode to sigrok-internal one.
\param[in] mcode Model code.
\return Model code
*/
SR_PRIV int sr_gmc_decode_model_bidi(guchar mcode);
/** Create 14-bytes (42 byte) message used in bidirectional mode.
* \param[in] addr Target address. 0..15, 0=Broadcast.
* \param[in] func Function code.
* \param[in] params Further parameters, &char[9]. Unused bytes must be 0.
* \param[out] buf &guchar[42] Output buffer (3*14).
*
*/
void create_msg_14(guchar addr, guchar func, guchar* params, guchar* buf);
/** Get model string from sigrok-internal model code.
*/
SR_PRIV const char* sr_gmc_model_str(enum model mcode);
/** Private, per-device-instance driver context. */
struct dev_context {
/* Model-specific information */
enum model model; /**< Model code. */
/* Acquisition settings */
uint64_t limit_samples; /**< Target number of samples */
uint64_t limit_msec; /**< Target sampling time */
/* Opaque pointer passed in by frontend. */
void *cb_data;
/* Operational state */
gboolean settings_ok; /**< Settings msg received yet. */
int msg_type; /**< Message type (MSGID_INF, ...). */
int msg_len; /**< Message lengh (valid when msg, curr. type known).*/
int mq; /**< Measured quantity */
int unit; /**< Measured unit */
uint64_t mqflags; /**< Measured quantity flags */
float value; /**< Measured value */
float scale; /**< Scale for value. */
int8_t scale1000; /**< Additional scale factor 1000^x. */
gboolean vmains_29S; /**< Measured ctmv is V mains (29S only). */
/* Temporary state across callbacks */
uint64_t num_samples; /**< Current #samples for limit_samples */
GTimer* elapsed_msec; /**< Used for sampling with limit_msec */
unsigned char buf[GMC_BUFSIZE]; /**< Buffer for read callback */
int buflen; /**< Data len in buf */
};
SR_PRIV int gmc_mh_1x_2x_receive_data(int fd, int revents, void *cb_data);