[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"

#define LINE_LENGTH 20

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[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;
	memset(&analog, 0, sizeof(struct sr_datafeed_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 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.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(struct sr_datafeed_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	#define LINE_LENGTH 20
	28
	29	SR_PRIV const struct nmadmm_req nmadmm_requests[] = {
	30	{ NMADMM_REQ_IDN, "IDN?" },
	31	{ NMADMM_REQ_IDN, "STATUS?" },
	32	{ 0, NULL },
	33	};
	34
	35	static int nma_send_req(const struct sr_dev_inst sdi, int req, char params)
	36	{
	37	struct sr_serial_dev_inst *serial;
	38	struct dev_context *devc;
	39	char buf[NMADMM_BUFSIZE];
	40	int len;
	41
	42	if (!sdi \|\| !(serial = sdi->conn) \|\| !(devc = sdi->priv))
	43	return SR_ERR_BUG;
	44
	45	len = snprintf(buf, sizeof(buf), "%s%s\r\n",
	46	nmadmm_requests[req].req_str, params ? params : "");
	47
	48	sr_spew("Sending request: '%s'.", buf);
	49
	50	devc->last_req = req;
	51	devc->last_req_pending = TRUE;
	52
	53	if (serial_write_blocking(serial, buf, len, 0) < 0) {
	54	sr_err("Unable to send request.");
	55	devc->last_req_pending = FALSE;
	56	return SR_ERR;
	57	}
	58
	59	devc->req_sent_at = g_get_monotonic_time();
	60
	61	return SR_OK;
	62	}
	63
	64	/**
	65	* Convert hexadecimal digit to int.
	66	*
	67	* @param[in] xgit Hexadecimal digit to convert.
	68	* @return Int value of xgit (0 on invalid xgit).
	69	*/
	70	SR_PRIV int xgittoint(char xgit)
	71	{
	72	if ((xgit >= '0') && (xgit <= '9'))
	73	return xgit - '0';
	74	xgit = tolower(xgit);
	75	if ((xgit >= 'a') && (xgit <= 'f'))
	76	return xgit - 'a';
	77	return 0;
	78	}
	79
	80	/**
	81	* Process received line. It consists of 20 hex digits + \\r\\n,
	82	* e.g. '08100400018100400000'.
	83	*/
	84	static void nma_process_line(const struct sr_dev_inst *sdi)
	85	{
	86	struct dev_context *devc;
	87	int pos, flags;
	88	int vt, range; /* Measurement value type, range in device format */
	89	int mmode, devstat; /* Measuring mode, device status */
	90	float value; /* Measured value */
	91	float scale; /* Scaling factor depending on range and function */
	92	struct sr_datafeed_analog analog;
	93	struct sr_datafeed_packet packet;
	94
	95	devc = sdi->priv;
	96
	97	devc->buf[LINE_LENGTH] = '\0';
	98
	99	sr_spew("Received line '%s'.", devc->buf);
	100
	101	/* Check line. */
	102	if (strlen((const char *)devc->buf) != LINE_LENGTH) {
	103	sr_err("line: Invalid status '%s', must be 20 hex digits.",
	104	devc->buf);
	105	devc->buflen = 0;
	106	return;
	107	}
	108
	109	for (pos = 0; pos < LINE_LENGTH; pos++) {
	110	if (!isxdigit(devc->buf[pos])) {
	111	sr_err("line: Expected hex digit in '%s' at pos %d!",
	112	devc->buf, pos);
	113	devc->buflen = 0;
	114	return;
	115	}
	116	}
	117
	118	/* Start decoding. */
	119	value = 0.0;
	120	scale = 1.0;
	121	memset(&analog, 0, sizeof(struct sr_datafeed_analog));
	122
	123	/*
	124	* The numbers are hex digits, starting from 0.
	125	* 0: Keyboard status, currently not interesting.
	126	* 1: Central switch status, currently not interesting.
	127	* 2: Type of measured value.
	128	*/
	129	vt = xgittoint(devc->buf[2]);
	130	switch (vt) {
	131	case 0:
	132	analog.mq = SR_MQ_VOLTAGE;
	133	break;
	134	case 1:
	135	analog.mq = SR_MQ_CURRENT; /* 2A */
	136	break;
	137	case 2:
	138	analog.mq = SR_MQ_RESISTANCE;
	139	break;
	140	case 3:
	141	analog.mq = SR_MQ_CAPACITANCE;
	142	break;
	143	case 4:
	144	analog.mq = SR_MQ_TEMPERATURE;
	145	break;
	146	case 5:
	147	analog.mq = SR_MQ_FREQUENCY;
	148	break;
	149	case 6:
	150	analog.mq = SR_MQ_CURRENT; /* 10A */
	151	break;
	152	case 7:
	153	analog.mq = SR_MQ_GAIN; /* TODO: Scale factor */
	154	break;
	155	case 8:
	156	analog.mq = SR_MQ_GAIN; /* Percentage */
	157	scale /= 100.0;
	158	break;
	159	case 9:
	160	analog.mq = SR_MQ_GAIN; /* dB */
	161	scale /= 100.0;
	162	break;
	163	default:
	164	sr_err("Unknown value type: 0x%02x.", vt);
	165	break;
	166	}
	167
	168	/* 3: Measurement range for measured value */
	169	range = xgittoint(devc->buf[3]);
	170	switch (vt) {
	171	case 0: /* V */
	172	scale *= pow(10.0, range - 5);
	173	break;
	174	case 1: /* A */
	175	scale *= pow(10.0, range - 7);
	176	break;
	177	case 2: /* Ω */
	178	scale *= pow(10.0, range - 2);
	179	break;
	180	case 3: /* F */
	181	scale *= pow(10.0, range - 12);
	182	break;
	183	case 4: /* °C */
	184	scale *= pow(10.0, range - 1);
	185	break;
	186	case 5: /* Hz */
	187	scale *= pow(10.0, range - 2);
	188	break;
	189	// No default, other value types have fixed display format.
	190	}
	191
	192	/* 5: Sign and 1st digit */
	193	flags = xgittoint(devc->buf[5]);
	194	value = (flags & 0x03);
	195	if (flags & 0x04)
	196	scale *= -1;
	197
	198	/* 6-9: 2nd-4th digit */
	199	for (pos = 6; pos < 10; pos++)
	200	value = value * 10 + xgittoint(devc->buf[pos]);
	201	value *= scale;
	202
	203	/* 10: Display counter */
	204	mmode = xgittoint(devc->buf[10]);
	205	switch (mmode) {
	206	case 0: /* Frequency */
	207	analog.unit = SR_UNIT_HERTZ;
	208	break;
	209	case 1: /* V TRMS, only type 5 */
	210	analog.unit = SR_UNIT_VOLT;
	211	analog.mqflags \|= (SR_MQFLAG_AC \| SR_MQFLAG_DC \| SR_MQFLAG_RMS);
	212	break;
	213	case 2: /* V AC */
	214	analog.unit = SR_UNIT_VOLT;
	215	analog.mqflags \|= SR_MQFLAG_AC;
	216	if (devc->type >= 3)
	217	analog.mqflags \|= SR_MQFLAG_RMS;
	218	break;
	219	case 3: /* V DC */
	220	analog.unit = SR_UNIT_VOLT;
	221	analog.mqflags \|= SR_MQFLAG_DC;
	222	break;
	223	case 4: /* Ohm */
	224	analog.unit = SR_UNIT_OHM;
	225	break;
	226	case 5: /* Continuity */
	227	analog.unit = SR_UNIT_BOOLEAN;
	228	analog.mq = SR_MQ_CONTINUITY;
	229	/* TODO: Continuity handling is a bit odd in libsigrok. */
	230	break;
	231	case 6: /* Degree Celsius */
	232	analog.unit = SR_UNIT_CELSIUS;
	233	break;
	234	case 7: /* Capacity */
	235	analog.unit = SR_UNIT_FARAD;
	236	break;
	237	case 8: /* Current DC */
	238	analog.unit = SR_UNIT_AMPERE;
	239	analog.mqflags \|= SR_MQFLAG_DC;
	240	break;
	241	case 9: /* Current AC */
	242	analog.unit = SR_UNIT_AMPERE;
	243	analog.mqflags \|= SR_MQFLAG_AC;
	244	if (devc->type >= 3)
	245	analog.mqflags \|= SR_MQFLAG_RMS;
	246	break;
	247	case 0xa: /* Current TRMS, only type 5 */
	248	analog.unit = SR_UNIT_AMPERE;
	249	analog.mqflags \|= (SR_MQFLAG_AC \| SR_MQFLAG_DC \| SR_MQFLAG_RMS);
	250	break;
	251	case 0xb: /* Diode */
	252	analog.unit = SR_UNIT_VOLT;
	253	analog.mqflags \|= (SR_MQFLAG_DIODE \| SR_MQFLAG_DC);
	254	break;
	255	default:
	256	sr_err("Unknown mmode: 0x%02x.", mmode);
	257	break;
	258	}
	259
	260	/* 11: Device status */
	261	devstat = xgittoint(devc->buf[11]);
	262
	263	switch (devstat) {
	264	case 1: /* Normal measurement */
	265	break;
	266	case 2: /* Input loop (limit, reference values) */
	267	break;
	268	case 3: /* TRANS/SENS */
	269	break;
	270	case 4: /* Error */
	271	sr_err("Device error. Fuse?"); /* TODO: Really abort? */
	272	devc->buflen = 0;
	273	return; /* Cannot continue. */
	274	default:
	275	sr_err("Unknown device status: 0x%02x", devstat);
	276	break;
	277	}
	278
	279	/* 12-19: Flags and display symbols */
	280	/* 12, 13 */
	281	flags = (xgittoint(devc->buf[12]) << 8) \| xgittoint(devc->buf[13]);
	282	/* 0x80: PRINT TODO: Stop polling when discovered? */
	283	/* 0x40: EXTR */
	284	if (analog.mq == SR_MQ_CONTINUITY) {
	285	if (flags & 0x20)
	286	value = 1.0; /* Beep */
	287	else
	288	value = 0.0;
	289	}
	290	/* 0x10: AVG */
	291	/* 0x08: Diode */
	292	if (flags & 0x04) /* REL */
	293	analog.mqflags \|= SR_MQFLAG_RELATIVE;
	294	/* 0x02: SHIFT */
	295	if (flags & 0x01) /* % */
	296	analog.unit = SR_UNIT_PERCENTAGE;
	297
	298	/* 14, 15 */
	299	flags = (xgittoint(devc->buf[14]) << 8) \| xgittoint(devc->buf[15]);
	300	if (!(flags & 0x80)) /* MAN: Manual range */
	301	analog.mqflags \|= SR_MQFLAG_AUTORANGE;
	302	if (flags & 0x40) /* LOBATT1: Low battery, measurement still within specs */
	303	devc->lowbatt = 1;
	304	/* 0x20: PEAK */
	305	/* 0x10: COUNT */
	306	if (flags & 0x08) /* HOLD */
	307	analog.mqflags \|= SR_MQFLAG_HOLD;
	308	/* 0x04: LIMIT */
	309	if (flags & 0x02) /* MAX */
	310	analog.mqflags \|= SR_MQFLAG_MAX;
	311	if (flags & 0x01) /* MIN */
	312	analog.mqflags \|= SR_MQFLAG_MIN;
	313
	314	/* 16, 17 */
	315	flags = (xgittoint(devc->buf[16]) << 8) \| xgittoint(devc->buf[17]);
	316	/* 0xe0: undefined */
	317	if (flags & 0x10) { /* LOBATT2: Low battery, measurement inaccurate */
	318	devc->lowbatt = 2;
	319	sr_warn("Low battery, measurement quality degraded!");
	320	}
	321	/* 0x08: SCALED */
	322	/* 0x04: RATE (=lower resolution, allows higher data rate up to 10/s. */
	323	/* 0x02: Current clamp */
	324	if (flags & 0x01) { /* dB */
	325	/*
	326	* TODO: The Norma has an adjustable dB reference value. If
	327	* changed from default, this is not correct.
	328	*/
	329	if (analog.unit == SR_UNIT_VOLT)
	330	analog.unit = SR_UNIT_DECIBEL_VOLT;
	331	else
	332	analog.unit = SR_UNIT_UNITLESS;
	333	}
	334
	335	/* 18, 19 */
	336	/* flags = (xgittoint(devc->buf[18]) << 8) \| xgittoint(devc->buf[19]); */
	337	/* 0x80: Undefined. */
	338	/* 0x40: Remote mode, keyboard locked */
	339	/* 0x38: Undefined. */
	340	/* 0x04: MIN > MAX */
	341	/* 0x02: Measured value < Min */
	342	/* 0x01: Measured value > Max */
	343
	344	/* 4: Flags. Evaluating this after setting value! */
	345	flags = xgittoint(devc->buf[4]);
	346	if (flags & 0x04) /* Invalid value */
	347	value = NAN;
	348	else if (flags & 0x01) /* Overload */
	349	value = INFINITY;
	350	if (flags & 0x02) { /* Duplicate value, has been sent before. */
	351	sr_spew("Duplicate value, dismissing!");
	352	devc->buflen = 0;
	353	return;
	354	}
	355
	356	sr_spew("range=%d/scale=%f/value=%f", range,
	357	(double)scale, (double)value);
	358
	359	/* Finish and send packet. */
	360	analog.channels = sdi->channels;
	361	analog.num_samples = 1;
	362	analog.data = &value;
	363
	364	memset(&packet, 0, sizeof(struct sr_datafeed_packet));
	365	packet.type = SR_DF_ANALOG;
	366	packet.payload = &analog;
	367	sr_session_send(devc->cb_data, &packet);
	368
	369	/* Finish processing. */
	370	devc->num_samples++;
	371	devc->buflen = 0;
	372	}
	373
	374	SR_PRIV int norma_dmm_receive_data(int fd, int revents, void *cb_data)
	375	{
	376	struct sr_dev_inst *sdi;
	377	struct dev_context *devc;
	378	struct sr_serial_dev_inst *serial;
	379	int len;
	380	gboolean terminating;
	381	gdouble elapsed_s;
	382
	383	(void)fd;
	384
	385	if (!(sdi = cb_data))
	386	return TRUE;
	387
	388	if (!(devc = sdi->priv))
	389	return TRUE;
	390
	391	serial = sdi->conn;
	392	if (revents == G_IO_IN) {
	393	/* Serial data arrived. */
	394	while (NMADMM_BUFSIZE - devc->buflen - 1 > 0) {
	395	len = serial_read_nonblocking(serial, devc->buf + devc->buflen, 1);
	396	if (len < 1)
	397	break;
	398	devc->buflen += len;
	399	*(devc->buf + devc->buflen) = '\0';
	400	if (*(devc->buf + devc->buflen - 1) == '\n') {
	401	/*
	402	* TODO: According to specs, should be \r, but
	403	* then we'd have to get rid of the \n.
	404	*/
	405	devc->last_req_pending = FALSE;
	406	nma_process_line(sdi);
	407	break;
	408	}
	409	}
	410	}
	411
	412	/* If number of samples or time limit reached, stop acquisition. */
	413	terminating = FALSE;
	414	if (devc->limit_samples && (devc->num_samples >= devc->limit_samples)) {
	415	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	416	terminating = TRUE;
	417	}
	418
	419	if (devc->limit_msec) {
	420	elapsed_s = g_timer_elapsed(devc->elapsed_msec, NULL);
	421	if ((elapsed_s * 1000) >= devc->limit_msec) {
	422	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	423	terminating = TRUE;
	424	}
	425	}
	426
	427	/* Request next package. */
	428	if (!terminating) {
	429	if (devc->last_req_pending) {
	430	gint64 elapsed_us = g_get_monotonic_time() - devc->req_sent_at;
	431	if (elapsed_us > NMADMM_TIMEOUT_MS * 1000) {/* Timeout! */
	432	sr_spew("Request timeout!");
	433	devc->last_req_pending = FALSE;
	434	}
	435	}
	436	if (!devc->last_req_pending) {
	437	if (nma_send_req(sdi, NMADMM_REQ_STATUS, NULL) != SR_OK)
	438	return FALSE;
	439	}
	440	}
	441
	442	return TRUE;
	443	}