[libsigrok.git] / src / hardware / norma-dmm / protocol.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2013 Matthias Heidbrink <m-sigrok@heidbrink.biz>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/** @file
 *  Norma DM9x0/Siemens B102x DMMs driver.
 *  @internal
 */

#include "protocol.h"

SR_PRIV const struct nmadmm_req nmadmm_requests[] = {
	{ NMADMM_REQ_IDN, "IDN?" },
	{ NMADMM_REQ_IDN, "STATUS?" },
	{ 0, NULL },
};

static int nma_send_req(const struct sr_dev_inst *sdi, int req, char *params)
{
	struct sr_serial_dev_inst *serial;
	struct dev_context *devc;
	char buf[NMADMM_BUFSIZE];
	int len;

	if (!sdi || !(serial = sdi->conn) || !(devc = sdi->priv))
		return SR_ERR_BUG;

	len = snprintf(buf, sizeof(buf), "%s%s\r\n",
		nmadmm_requests[req].req_str, params ? params : "");

	sr_spew("Sending request: '%s'.", buf);

	devc->last_req = req;
	devc->last_req_pending = TRUE;

	if (serial_write_blocking(serial, buf, len, 0) < 0) {
		sr_err("Unable to send request.");
		devc->last_req_pending = FALSE;
		return SR_ERR;
	}

	devc->req_sent_at = g_get_monotonic_time();

	return SR_OK;
}

/**
 * Convert hexadecimal digit to int.
 *
 * @param[in] xgit Hexadecimal digit to convert.
 * @return Int value of xgit (0 on invalid xgit).
 */
SR_PRIV int xgittoint(char xgit)
{
	if ((xgit >= '0') && (xgit <= '9'))
		return xgit - '0';
	xgit = tolower(xgit);
	if ((xgit >= 'a') && (xgit <= 'f'))
		return xgit - 'a';
	return 0;
}

/**
 * Process received line. It consists of 20 hex digits + \\r\\n,
 * e.g. '08100400018100400000'.
 */
static void nma_process_line(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	int pos, flags;
	int vt, range;	/* Measurement value type, range in device format */
	int mmode, devstat;	/* Measuring mode, device status */
	float value;	/* Measured value */
	float scale;	/* Scaling factor depending on range and function */
	struct sr_datafeed_analog analog;
	struct sr_datafeed_packet packet;

	devc = sdi->priv;

	devc->buf[20] = '\0';

	sr_spew("Received line '%s'.", devc->buf);

	/* Check line. */
	if (strlen((const char *)devc->buf) != 20) {
		sr_err("line: Invalid status '%s', must be 20 hex digits.",
		       devc->buf);
		devc->buflen = 0;
		return;
	}

	for (pos = 0; pos < 20; pos++) {
		if (!isxdigit(devc->buf[pos])) {
			sr_err("line: Expected hex digit in '%s' at pos %d!",
				devc->buf, pos);
			devc->buflen = 0;
			return;
		}
	}

	/* Start decoding. */
	value = 0.0;
	scale = 1.0;
	memset(&analog, 0, sizeof(analog));

	/*
	 * The numbers are hex digits, starting from 0.
	 * 0: Keyboard status, currently not interesting.
	 * 1: Central switch status, currently not interesting.
	 * 2: Type of measured value.
	 */
	vt = xgittoint(devc->buf[2]);
	switch (vt) {
	case 0:
		analog.mq = SR_MQ_VOLTAGE;
		break;
	case 1:
		analog.mq = SR_MQ_CURRENT;	/* 2A */
		break;
	case 2:
		analog.mq = SR_MQ_RESISTANCE;
		break;
	case 3:
		analog.mq = SR_MQ_CAPACITANCE;
		break;
	case 4:
		analog.mq = SR_MQ_TEMPERATURE;
		break;
	case 5:
		analog.mq = SR_MQ_FREQUENCY;
		break;
	case 6:
		analog.mq = SR_MQ_CURRENT;	/* 10A */
		break;
	case 7:
		analog.mq = SR_MQ_GAIN;		/* TODO: Scale factor */
		break;
	case 8:
		analog.mq = SR_MQ_GAIN;		/* Percentage */
		scale /= 100.0;
		break;
	case 9:
		analog.mq = SR_MQ_GAIN;		/* dB */
		scale /= 100.0;
		break;
	default:
		sr_err("Unknown value type: 0x%02x.", vt);
		break;
	}

	/* 3: Measurement range for measured value */
	range = xgittoint(devc->buf[3]);
	switch (vt) {
	case 0: /* V */
		scale *= pow(10.0, range - 5);
		break;
	case 1: /* A */
		scale *= pow(10.0, range - 7);
		break;
	case 2: /* Ω */
		scale *= pow(10.0, range - 2);
		break;
	case 3: /* F */
		scale *= pow(10.0, range - 12);
		break;
	case 4: /* °C */
		scale *= pow(10.0, range - 1);
		break;
	case 5: /* Hz */
		scale *= pow(10.0, range - 2);
		break;
	// No default, other value types have fixed display format.
	}

	/* 5: Sign and 1st digit */
	flags = xgittoint(devc->buf[5]);
	value = (flags & 0x03);
	if (flags & 0x04)
		scale *= -1;

	/* 6-9: 2nd-4th digit */
	for (pos = 6; pos < 10; pos++)
		value = value * 10 + xgittoint(devc->buf[pos]);
	value *= scale;

	/* 10: Display counter */
	mmode = xgittoint(devc->buf[10]);
	switch (mmode) {
	case 0: /* Frequency */
		analog.unit = SR_UNIT_HERTZ;
		break;
	case 1: /* V TRMS, only type 5 */
		analog.unit = SR_UNIT_VOLT;
		analog.mqflags |= (SR_MQFLAG_AC | SR_MQFLAG_DC | SR_MQFLAG_RMS);
		break;
	case 2: /* V AC */
		analog.unit = SR_UNIT_VOLT;
		analog.mqflags |= SR_MQFLAG_AC;
		if (devc->type >= 3)
			analog.mqflags |= SR_MQFLAG_RMS;
		break;
	case 3: /* V DC */
		analog.unit = SR_UNIT_VOLT;
		analog.mqflags |= SR_MQFLAG_DC;
		break;
	case 4: /* Ohm */
		analog.unit = SR_UNIT_OHM;
		break;
	case 5: /* Continuity */
		analog.unit = SR_UNIT_BOOLEAN;
		analog.mq = SR_MQ_CONTINUITY;
		/* TODO: Continuity handling is a bit odd in libsigrok. */
		break;
	case 6: /* Degree Celsius */
		analog.unit = SR_UNIT_CELSIUS;
		break;
	case 7: /* Capacity */
		analog.unit = SR_UNIT_FARAD;
		break;
	case 8: /* Current DC */
		analog.unit = SR_UNIT_AMPERE;
		analog.mqflags |= SR_MQFLAG_DC;
		break;
	case 9: /* Current AC */
		analog.unit = SR_UNIT_AMPERE;
		analog.mqflags |= SR_MQFLAG_AC;
		if (devc->type >= 3)
			analog.mqflags |= SR_MQFLAG_RMS;
		break;
	case 0xa: /* Current TRMS, only type 5 */
		analog.unit = SR_UNIT_AMPERE;
		analog.mqflags |= (SR_MQFLAG_AC | SR_MQFLAG_DC | SR_MQFLAG_RMS);
		break;
	case 0xb: /* Diode */
		analog.unit = SR_UNIT_VOLT;
		analog.mqflags |= (SR_MQFLAG_DIODE | SR_MQFLAG_DC);
		break;
	default:
		sr_err("Unknown mmode: 0x%02x.", mmode);
		break;
	}

	/* 11: Device status */
	devstat = xgittoint(devc->buf[11]);

	switch (devstat) {
	case 1: /* Normal measurement */
		break;
	case 2: /* Input loop (limit, reference values) */
		break;
	case 3: /* TRANS/SENS */
		break;
	case 4: /* Error */
		sr_err("Device error. Fuse?"); /* TODO: Really abort? */
		devc->buflen = 0;
		return;	/* Cannot continue. */
	default:
		sr_err("Unknown device status: 0x%02x", devstat);
		break;
	}

	/* 12-19: Flags and display symbols */
	/* 12, 13 */
	flags = (xgittoint(devc->buf[12]) << 8) | xgittoint(devc->buf[13]);
	/* 0x80: PRINT TODO: Stop polling when discovered? */
	/* 0x40: EXTR */
	if (analog.mq == SR_MQ_CONTINUITY) {
		if (flags & 0x20)
			value = 1.0; /* Beep */
		else
			value = 0.0;
	}
	/* 0x10: AVG */
	/* 0x08: Diode */
	if (flags & 0x04) /* REL */
		analog.mqflags |= SR_MQFLAG_RELATIVE;
	/* 0x02: SHIFT	*/
	if (flags & 0x01) /* % */
		analog.unit = SR_UNIT_PERCENTAGE;

	/* 14, 15 */
	flags = (xgittoint(devc->buf[14]) << 8) | xgittoint(devc->buf[15]);
	if (!(flags & 0x80))	/* MAN: Manual range */
		analog.mqflags |= SR_MQFLAG_AUTORANGE;
	if (flags & 0x40) /* LOBATT1: Low battery, measurement still within specs */
		devc->lowbatt = 1;
	/* 0x20: PEAK */
	/* 0x10: COUNT */
	if (flags & 0x08)	/* HOLD */
		analog.mqflags |= SR_MQFLAG_HOLD;
	/* 0x04: LIMIT	*/
	if (flags & 0x02) 	/* MAX */
		analog.mqflags |= SR_MQFLAG_MAX;
	if (flags & 0x01) 	/* MIN */
		analog.mqflags |= SR_MQFLAG_MIN;

	/* 16, 17 */
	flags = (xgittoint(devc->buf[16]) << 8) | xgittoint(devc->buf[17]);
	/* 0xe0: undefined */
	if (flags & 0x10) { /* LOBATT2: Low battery, measurement inaccurate */
		devc->lowbatt = 2;
		sr_warn("Low battery, measurement quality degraded!");
	}
	/* 0x08: SCALED */
	/* 0x04: RATE (=lower resolution, allows higher rata rate up to 10/s. */
	/* 0x02: Current clamp */
	if (flags & 0x01) { /* dB */
		/*
		 * TODO: The Norma has an adjustable dB reference value. If
		 * changed from default, this is not correct.
		 */
		if (analog.unit == SR_UNIT_VOLT)
			analog.unit = SR_UNIT_DECIBEL_VOLT;
		else
			analog.unit = SR_UNIT_UNITLESS;
	}

	/* 18, 19 */
	/* flags = (xgittoint(devc->buf[18]) << 8) | xgittoint(devc->buf[19]); */
	/* 0x80: Undefined. */
	/* 0x40: Remote mode, keyboard locked */
	/* 0x38: Undefined. */
	/* 0x04: MIN > MAX */
	/* 0x02: Measured value < Min */
	/* 0x01: Measured value > Max */

	/* 4: Flags. Evaluating this after setting value! */
	flags = xgittoint(devc->buf[4]);
	if (flags & 0x04) /* Invalid value */
	    value = NAN;
	else if (flags & 0x01) /* Overload */
	    value =  INFINITY;
	if (flags & 0x02) { /* Duplicate value, has been sent before. */
	    sr_spew("Duplicate value, dismissing!");
	    devc->buflen = 0;
	    return;
	}

	sr_spew("range=%d/scale=%f/value=%f", range,
		(double)scale, (double)value);

	/* Finish and send packet. */
	analog.channels = sdi->channels;
	analog.num_samples = 1;
	analog.data = &value;

	memset(&packet, 0, sizeof(packet));
	packet.type = SR_DF_ANALOG;
	packet.payload = &analog;
	sr_session_send(devc->cb_data, &packet);

	/* Finish processing. */
	devc->num_samples++;
	devc->buflen = 0;
}

SR_PRIV int norma_dmm_receive_data(int fd, int revents, void *cb_data)
{
	struct sr_dev_inst *sdi;
	struct dev_context *devc;
	struct sr_serial_dev_inst *serial;
	int len;
	gboolean terminating;
	gdouble elapsed_s;

	(void)fd;

	if (!(sdi = cb_data))
		return TRUE;

	if (!(devc = sdi->priv))
		return TRUE;

	serial = sdi->conn;
	if (revents == G_IO_IN) {
		/* Serial data arrived. */
		while (NMADMM_BUFSIZE - devc->buflen - 1 > 0) {
			len = serial_read_nonblocking(serial, devc->buf + devc->buflen, 1);
			if (len < 1)
				break;
			devc->buflen += len;
			*(devc->buf + devc->buflen) = '\0';
			if (*(devc->buf + devc->buflen - 1) == '\n') {
				/*
				 * TODO: According to specs, should be \r, but
				 * then we'd have to get rid of the \n.
				 */
				devc->last_req_pending = FALSE;
				nma_process_line(sdi);
				break;
			}
		}
	}

	/* If number of samples or time limit reached, stop acquisition. */
	terminating = FALSE;
	if (devc->limit_samples && (devc->num_samples >= devc->limit_samples)) {
		sdi->driver->dev_acquisition_stop(sdi, cb_data);
		terminating = TRUE;
	}

	if (devc->limit_msec) {
		elapsed_s = g_timer_elapsed(devc->elapsed_msec, NULL);
		if ((elapsed_s * 1000) >= devc->limit_msec) {
			sdi->driver->dev_acquisition_stop(sdi, cb_data);
			terminating = TRUE;
		}
	}

	/* Request next package. */
	if (!terminating) {
		if (devc->last_req_pending) {
			gint64 elapsed_us = g_get_monotonic_time() - devc->req_sent_at;
			if (elapsed_us > NMADMM_TIMEOUT_MS * 1000) {/* Timeout! */
				sr_spew("Request timeout!");
				devc->last_req_pending = FALSE;
			}
		}
		if (!devc->last_req_pending) {
			if (nma_send_req(sdi, NMADMM_REQ_STATUS, NULL) != SR_OK)
				return FALSE;
		}
	}

	return TRUE;
}
Commit	Line	Data
	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2013 Matthias Heidbrink <m-sigrok@heidbrink.biz>
	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
	20	/** @file
	21	* Norma DM9x0/Siemens B102x DMMs driver.
	22	* @internal
	23	*/
	24
	25	#include "protocol.h"
	26
	27	SR_PRIV const struct nmadmm_req nmadmm_requests[] = {
	28	{ NMADMM_REQ_IDN, "IDN?" },
	29	{ NMADMM_REQ_IDN, "STATUS?" },
	30	{ 0, NULL },
	31	};
	32
	33	static int nma_send_req(const struct sr_dev_inst sdi, int req, char params)
	34	{
	35	struct sr_serial_dev_inst *serial;
	36	struct dev_context *devc;
	37	char buf[NMADMM_BUFSIZE];
	38	int len;
	39
	40	if (!sdi \|\| !(serial = sdi->conn) \|\| !(devc = sdi->priv))
	41	return SR_ERR_BUG;
	42
	43	len = snprintf(buf, sizeof(buf), "%s%s\r\n",
	44	nmadmm_requests[req].req_str, params ? params : "");
	45
	46	sr_spew("Sending request: '%s'.", buf);
	47
	48	devc->last_req = req;
	49	devc->last_req_pending = TRUE;
	50
	51	if (serial_write_blocking(serial, buf, len, 0) < 0) {
	52	sr_err("Unable to send request.");
	53	devc->last_req_pending = FALSE;
	54	return SR_ERR;
	55	}
	56
	57	devc->req_sent_at = g_get_monotonic_time();
	58
	59	return SR_OK;
	60	}
	61
	62	/**
	63	* Convert hexadecimal digit to int.
	64	*
	65	* @param[in] xgit Hexadecimal digit to convert.
	66	* @return Int value of xgit (0 on invalid xgit).
	67	*/
	68	SR_PRIV int xgittoint(char xgit)
	69	{
	70	if ((xgit >= '0') && (xgit <= '9'))
	71	return xgit - '0';
	72	xgit = tolower(xgit);
	73	if ((xgit >= 'a') && (xgit <= 'f'))
	74	return xgit - 'a';
	75	return 0;
	76	}
	77
	78	/**
	79	* Process received line. It consists of 20 hex digits + \\r\\n,
	80	* e.g. '08100400018100400000'.
	81	*/
	82	static void nma_process_line(const struct sr_dev_inst *sdi)
	83	{
	84	struct dev_context *devc;
	85	int pos, flags;
	86	int vt, range; /* Measurement value type, range in device format */
	87	int mmode, devstat; /* Measuring mode, device status */
	88	float value; /* Measured value */
	89	float scale; /* Scaling factor depending on range and function */
	90	struct sr_datafeed_analog analog;
	91	struct sr_datafeed_packet packet;
	92
	93	devc = sdi->priv;
	94
	95	devc->buf[20] = '\0';
	96
	97	sr_spew("Received line '%s'.", devc->buf);
	98
	99	/* Check line. */
	100	if (strlen((const char *)devc->buf) != 20) {
	101	sr_err("line: Invalid status '%s', must be 20 hex digits.",
	102	devc->buf);
	103	devc->buflen = 0;
	104	return;
	105	}
	106
	107	for (pos = 0; pos < 20; pos++) {
	108	if (!isxdigit(devc->buf[pos])) {
	109	sr_err("line: Expected hex digit in '%s' at pos %d!",
	110	devc->buf, pos);
	111	devc->buflen = 0;
	112	return;
	113	}
	114	}
	115
	116	/* Start decoding. */
	117	value = 0.0;
	118	scale = 1.0;
	119	memset(&analog, 0, sizeof(analog));
	120
	121	/*
	122	* The numbers are hex digits, starting from 0.
	123	* 0: Keyboard status, currently not interesting.
	124	* 1: Central switch status, currently not interesting.
	125	* 2: Type of measured value.
	126	*/
	127	vt = xgittoint(devc->buf[2]);
	128	switch (vt) {
	129	case 0:
	130	analog.mq = SR_MQ_VOLTAGE;
	131	break;
	132	case 1:
	133	analog.mq = SR_MQ_CURRENT; /* 2A */
	134	break;
	135	case 2:
	136	analog.mq = SR_MQ_RESISTANCE;
	137	break;
	138	case 3:
	139	analog.mq = SR_MQ_CAPACITANCE;
	140	break;
	141	case 4:
	142	analog.mq = SR_MQ_TEMPERATURE;
	143	break;
	144	case 5:
	145	analog.mq = SR_MQ_FREQUENCY;
	146	break;
	147	case 6:
	148	analog.mq = SR_MQ_CURRENT; /* 10A */
	149	break;
	150	case 7:
	151	analog.mq = SR_MQ_GAIN; /* TODO: Scale factor */
	152	break;
	153	case 8:
	154	analog.mq = SR_MQ_GAIN; /* Percentage */
	155	scale /= 100.0;
	156	break;
	157	case 9:
	158	analog.mq = SR_MQ_GAIN; /* dB */
	159	scale /= 100.0;
	160	break;
	161	default:
	162	sr_err("Unknown value type: 0x%02x.", vt);
	163	break;
	164	}
	165
	166	/* 3: Measurement range for measured value */
	167	range = xgittoint(devc->buf[3]);
	168	switch (vt) {
	169	case 0: /* V */
	170	scale *= pow(10.0, range - 5);
	171	break;
	172	case 1: /* A */
	173	scale *= pow(10.0, range - 7);
	174	break;
	175	case 2: /* Ω */
	176	scale *= pow(10.0, range - 2);
	177	break;
	178	case 3: /* F */
	179	scale *= pow(10.0, range - 12);
	180	break;
	181	case 4: /* °C */
	182	scale *= pow(10.0, range - 1);
	183	break;
	184	case 5: /* Hz */
	185	scale *= pow(10.0, range - 2);
	186	break;
	187	// No default, other value types have fixed display format.
	188	}
	189
	190	/* 5: Sign and 1st digit */
	191	flags = xgittoint(devc->buf[5]);
	192	value = (flags & 0x03);
	193	if (flags & 0x04)
	194	scale *= -1;
	195
	196	/* 6-9: 2nd-4th digit */
	197	for (pos = 6; pos < 10; pos++)
	198	value = value * 10 + xgittoint(devc->buf[pos]);
	199	value *= scale;
	200
	201	/* 10: Display counter */
	202	mmode = xgittoint(devc->buf[10]);
	203	switch (mmode) {
	204	case 0: /* Frequency */
	205	analog.unit = SR_UNIT_HERTZ;
	206	break;
	207	case 1: /* V TRMS, only type 5 */
	208	analog.unit = SR_UNIT_VOLT;
	209	analog.mqflags \|= (SR_MQFLAG_AC \| SR_MQFLAG_DC \| SR_MQFLAG_RMS);
	210	break;
	211	case 2: /* V AC */
	212	analog.unit = SR_UNIT_VOLT;
	213	analog.mqflags \|= SR_MQFLAG_AC;
	214	if (devc->type >= 3)
	215	analog.mqflags \|= SR_MQFLAG_RMS;
	216	break;
	217	case 3: /* V DC */
	218	analog.unit = SR_UNIT_VOLT;
	219	analog.mqflags \|= SR_MQFLAG_DC;
	220	break;
	221	case 4: /* Ohm */
	222	analog.unit = SR_UNIT_OHM;
	223	break;
	224	case 5: /* Continuity */
	225	analog.unit = SR_UNIT_BOOLEAN;
	226	analog.mq = SR_MQ_CONTINUITY;
	227	/* TODO: Continuity handling is a bit odd in libsigrok. */
	228	break;
	229	case 6: /* Degree Celsius */
	230	analog.unit = SR_UNIT_CELSIUS;
	231	break;
	232	case 7: /* Capacity */
	233	analog.unit = SR_UNIT_FARAD;
	234	break;
	235	case 8: /* Current DC */
	236	analog.unit = SR_UNIT_AMPERE;
	237	analog.mqflags \|= SR_MQFLAG_DC;
	238	break;
	239	case 9: /* Current AC */
	240	analog.unit = SR_UNIT_AMPERE;
	241	analog.mqflags \|= SR_MQFLAG_AC;
	242	if (devc->type >= 3)
	243	analog.mqflags \|= SR_MQFLAG_RMS;
	244	break;
	245	case 0xa: /* Current TRMS, only type 5 */
	246	analog.unit = SR_UNIT_AMPERE;
	247	analog.mqflags \|= (SR_MQFLAG_AC \| SR_MQFLAG_DC \| SR_MQFLAG_RMS);
	248	break;
	249	case 0xb: /* Diode */
	250	analog.unit = SR_UNIT_VOLT;
	251	analog.mqflags \|= (SR_MQFLAG_DIODE \| SR_MQFLAG_DC);
	252	break;
	253	default:
	254	sr_err("Unknown mmode: 0x%02x.", mmode);
	255	break;
	256	}
	257
	258	/* 11: Device status */
	259	devstat = xgittoint(devc->buf[11]);
	260
	261	switch (devstat) {
	262	case 1: /* Normal measurement */
	263	break;
	264	case 2: /* Input loop (limit, reference values) */
	265	break;
	266	case 3: /* TRANS/SENS */
	267	break;
	268	case 4: /* Error */
	269	sr_err("Device error. Fuse?"); /* TODO: Really abort? */
	270	devc->buflen = 0;
	271	return; /* Cannot continue. */
	272	default:
	273	sr_err("Unknown device status: 0x%02x", devstat);
	274	break;
	275	}
	276
	277	/* 12-19: Flags and display symbols */
	278	/* 12, 13 */
	279	flags = (xgittoint(devc->buf[12]) << 8) \| xgittoint(devc->buf[13]);
	280	/* 0x80: PRINT TODO: Stop polling when discovered? */
	281	/* 0x40: EXTR */
	282	if (analog.mq == SR_MQ_CONTINUITY) {
	283	if (flags & 0x20)
	284	value = 1.0; /* Beep */
	285	else
	286	value = 0.0;
	287	}
	288	/* 0x10: AVG */
	289	/* 0x08: Diode */
	290	if (flags & 0x04) /* REL */
	291	analog.mqflags \|= SR_MQFLAG_RELATIVE;
	292	/* 0x02: SHIFT */
	293	if (flags & 0x01) /* % */
	294	analog.unit = SR_UNIT_PERCENTAGE;
	295
	296	/* 14, 15 */
	297	flags = (xgittoint(devc->buf[14]) << 8) \| xgittoint(devc->buf[15]);
	298	if (!(flags & 0x80)) /* MAN: Manual range */
	299	analog.mqflags \|= SR_MQFLAG_AUTORANGE;
	300	if (flags & 0x40) /* LOBATT1: Low battery, measurement still within specs */
	301	devc->lowbatt = 1;
	302	/* 0x20: PEAK */
	303	/* 0x10: COUNT */
	304	if (flags & 0x08) /* HOLD */
	305	analog.mqflags \|= SR_MQFLAG_HOLD;
	306	/* 0x04: LIMIT */
	307	if (flags & 0x02) /* MAX */
	308	analog.mqflags \|= SR_MQFLAG_MAX;
	309	if (flags & 0x01) /* MIN */
	310	analog.mqflags \|= SR_MQFLAG_MIN;
	311
	312	/* 16, 17 */
	313	flags = (xgittoint(devc->buf[16]) << 8) \| xgittoint(devc->buf[17]);
	314	/* 0xe0: undefined */
	315	if (flags & 0x10) { /* LOBATT2: Low battery, measurement inaccurate */
	316	devc->lowbatt = 2;
	317	sr_warn("Low battery, measurement quality degraded!");
	318	}
	319	/* 0x08: SCALED */
	320	/* 0x04: RATE (=lower resolution, allows higher rata rate up to 10/s. */
	321	/* 0x02: Current clamp */
	322	if (flags & 0x01) { /* dB */
	323	/*
	324	* TODO: The Norma has an adjustable dB reference value. If
	325	* changed from default, this is not correct.
	326	*/
	327	if (analog.unit == SR_UNIT_VOLT)
	328	analog.unit = SR_UNIT_DECIBEL_VOLT;
	329	else
	330	analog.unit = SR_UNIT_UNITLESS;
	331	}
	332
	333	/* 18, 19 */
	334	/* flags = (xgittoint(devc->buf[18]) << 8) \| xgittoint(devc->buf[19]); */
	335	/* 0x80: Undefined. */
	336	/* 0x40: Remote mode, keyboard locked */
	337	/* 0x38: Undefined. */
	338	/* 0x04: MIN > MAX */
	339	/* 0x02: Measured value < Min */
	340	/* 0x01: Measured value > Max */
	341
	342	/* 4: Flags. Evaluating this after setting value! */
	343	flags = xgittoint(devc->buf[4]);
	344	if (flags & 0x04) /* Invalid value */
	345	value = NAN;
	346	else if (flags & 0x01) /* Overload */
	347	value = INFINITY;
	348	if (flags & 0x02) { /* Duplicate value, has been sent before. */
	349	sr_spew("Duplicate value, dismissing!");
	350	devc->buflen = 0;
	351	return;
	352	}
	353
	354	sr_spew("range=%d/scale=%f/value=%f", range,
	355	(double)scale, (double)value);
	356
	357	/* Finish and send packet. */
	358	analog.channels = sdi->channels;
	359	analog.num_samples = 1;
	360	analog.data = &value;
	361
	362	memset(&packet, 0, sizeof(packet));
	363	packet.type = SR_DF_ANALOG;
	364	packet.payload = &analog;
	365	sr_session_send(devc->cb_data, &packet);
	366
	367	/* Finish processing. */
	368	devc->num_samples++;
	369	devc->buflen = 0;
	370	}
	371
	372	SR_PRIV int norma_dmm_receive_data(int fd, int revents, void *cb_data)
	373	{
	374	struct sr_dev_inst *sdi;
	375	struct dev_context *devc;
	376	struct sr_serial_dev_inst *serial;
	377	int len;
	378	gboolean terminating;
	379	gdouble elapsed_s;
	380
	381	(void)fd;
	382
	383	if (!(sdi = cb_data))
	384	return TRUE;
	385
	386	if (!(devc = sdi->priv))
	387	return TRUE;
	388
	389	serial = sdi->conn;
	390	if (revents == G_IO_IN) {
	391	/* Serial data arrived. */
	392	while (NMADMM_BUFSIZE - devc->buflen - 1 > 0) {
	393	len = serial_read_nonblocking(serial, devc->buf + devc->buflen, 1);
	394	if (len < 1)
	395	break;
	396	devc->buflen += len;
	397	*(devc->buf + devc->buflen) = '\0';
	398	if (*(devc->buf + devc->buflen - 1) == '\n') {
	399	/*
	400	* TODO: According to specs, should be \r, but
	401	* then we'd have to get rid of the \n.
	402	*/
	403	devc->last_req_pending = FALSE;
	404	nma_process_line(sdi);
	405	break;
	406	}
	407	}
	408	}
	409
	410	/* If number of samples or time limit reached, stop acquisition. */
	411	terminating = FALSE;
	412	if (devc->limit_samples && (devc->num_samples >= devc->limit_samples)) {
	413	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	414	terminating = TRUE;
	415	}
	416
	417	if (devc->limit_msec) {
	418	elapsed_s = g_timer_elapsed(devc->elapsed_msec, NULL);
	419	if ((elapsed_s * 1000) >= devc->limit_msec) {
	420	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	421	terminating = TRUE;
	422	}
	423	}
	424
	425	/* Request next package. */
	426	if (!terminating) {
	427	if (devc->last_req_pending) {
	428	gint64 elapsed_us = g_get_monotonic_time() - devc->req_sent_at;
	429	if (elapsed_us > NMADMM_TIMEOUT_MS * 1000) {/* Timeout! */
	430	sr_spew("Request timeout!");
	431	devc->last_req_pending = FALSE;
	432	}
	433	}
	434	if (!devc->last_req_pending) {
	435	if (nma_send_req(sdi, NMADMM_REQ_STATUS, NULL) != SR_OK)
	436	return FALSE;
	437	}
	438	}
	439
	440	return TRUE;
	441	}