[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 <config.h>
#include "protocol.h"

#define LINE_LENGTH 20

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

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,
			serial_timeout(serial, len)) < 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_analog_encoding encoding;
	struct sr_analog_meaning meaning;
	struct sr_analog_spec spec;
	struct sr_datafeed_packet packet;

	devc = sdi->priv;

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

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

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

	for (pos = 0; pos < LINE_LENGTH; 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;
	/* TODO: Use proper 'digits' value for this device (and its modes). */
	sr_analog_init(&analog, &encoding, &meaning, &spec, 2);

	/*
	 * 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.meaning->mq = SR_MQ_VOLTAGE;
		break;
	case 1:
		analog.meaning->mq = SR_MQ_CURRENT;	/* 2A */
		break;
	case 2:
		analog.meaning->mq = SR_MQ_RESISTANCE;
		break;
	case 3:
		analog.meaning->mq = SR_MQ_CAPACITANCE;
		break;
	case 4:
		analog.meaning->mq = SR_MQ_TEMPERATURE;
		break;
	case 5:
		analog.meaning->mq = SR_MQ_FREQUENCY;
		break;
	case 6:
		analog.meaning->mq = SR_MQ_CURRENT;	/* 10A */
		break;
	case 7:
		analog.meaning->mq = SR_MQ_GAIN;		/* TODO: Scale factor */
		break;
	case 8:
		analog.meaning->mq = SR_MQ_GAIN;		/* Percentage */
		scale /= 100.0;
		break;
	case 9:
		analog.meaning->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.meaning->unit = SR_UNIT_HERTZ;
		break;
	case 1: /* V TRMS, only type 5 */
		analog.meaning->unit = SR_UNIT_VOLT;
		analog.meaning->mqflags |= (SR_MQFLAG_AC | SR_MQFLAG_DC | SR_MQFLAG_RMS);
		break;
	case 2: /* V AC */
		analog.meaning->unit = SR_UNIT_VOLT;
		analog.meaning->mqflags |= SR_MQFLAG_AC;
		if (devc->type >= 3)
			analog.meaning->mqflags |= SR_MQFLAG_RMS;
		break;
	case 3: /* V DC */
		analog.meaning->unit = SR_UNIT_VOLT;
		analog.meaning->mqflags |= SR_MQFLAG_DC;
		break;
	case 4: /* Ohm */
		analog.meaning->unit = SR_UNIT_OHM;
		break;
	case 5: /* Continuity */
		analog.meaning->unit = SR_UNIT_BOOLEAN;
		analog.meaning->mq = SR_MQ_CONTINUITY;
		/* TODO: Continuity handling is a bit odd in libsigrok. */
		break;
	case 6: /* Degree Celsius */
		analog.meaning->unit = SR_UNIT_CELSIUS;
		break;
	case 7: /* Capacity */
		analog.meaning->unit = SR_UNIT_FARAD;
		break;
	case 8: /* Current DC */
		analog.meaning->unit = SR_UNIT_AMPERE;
		analog.meaning->mqflags |= SR_MQFLAG_DC;
		break;
	case 9: /* Current AC */
		analog.meaning->unit = SR_UNIT_AMPERE;
		analog.meaning->mqflags |= SR_MQFLAG_AC;
		if (devc->type >= 3)
			analog.meaning->mqflags |= SR_MQFLAG_RMS;
		break;
	case 0xa: /* Current TRMS, only type 5 */
		analog.meaning->unit = SR_UNIT_AMPERE;
		analog.meaning->mqflags |= (SR_MQFLAG_AC | SR_MQFLAG_DC | SR_MQFLAG_RMS);
		break;
	case 0xb: /* Diode */
		analog.meaning->unit = SR_UNIT_VOLT;
		analog.meaning->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.meaning->mq == SR_MQ_CONTINUITY) {
		if (flags & 0x20)
			value = 1.0; /* Beep */
		else
			value = 0.0;
	}
	/* 0x10: AVG */
	/* 0x08: Diode */
	if (flags & 0x04) /* REL */
		analog.meaning->mqflags |= SR_MQFLAG_RELATIVE;
	/* 0x02: SHIFT	*/
	if (flags & 0x01) /* % */
		analog.meaning->unit = SR_UNIT_PERCENTAGE;

	/* 14, 15 */
	flags = (xgittoint(devc->buf[14]) << 8) | xgittoint(devc->buf[15]);
	if (!(flags & 0x80))	/* MAN: Manual range */
		analog.meaning->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.meaning->mqflags |= SR_MQFLAG_HOLD;
	/* 0x04: LIMIT	*/
	if (flags & 0x02) 	/* MAX */
		analog.meaning->mqflags |= SR_MQFLAG_MAX;
	if (flags & 0x01) 	/* MIN */
		analog.meaning->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 data 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.meaning->unit == SR_UNIT_VOLT)
			analog.meaning->unit = SR_UNIT_DECIBEL_VOLT;
		else
			analog.meaning->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.meaning->channels = sdi->channels;
	analog.num_samples = 1;
	analog.data = &value;

	memset(&packet, 0, sizeof(struct sr_datafeed_packet));
	packet.type = SR_DF_ANALOG;
	packet.payload = &analog;
	sr_session_send(sdi, &packet);

	/* Finish processing. */
	sr_sw_limits_update_samples_read(&devc->limits, 1);
	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;

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