[libsigrok.git] / hardware / tekpower-dmm / protocol.c

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
 *
 * 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/>.
 */

#include <glib.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "config.h"
#include "protocol.h"
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <errno.h>


static gboolean lcd14_is_sync_valid(const lcd14_packet *packet)
{
	size_t i;
	/* Check the syncronization nibbles, and make sure they all match */
	for(i = 0; i < LCD14_PACKET_SIZE; i++)
	{
		uint8_t sync = (packet->raw[i] & LCD14_SYNC_MASK) >> 4;
		if(sync != (i+1) )
			return FALSE;
	}
	return TRUE;
}

static gboolean lcd14_is_selection_good(const lcd14_data *data)
{
	int n_postfix = 0;
	int n_type = 0;
	/* Does the packet have more than one multiplier ? */
	if(data->flags & LCD14_NANO)
		n_postfix++;
	if(data->flags & LCD14_MICRO)
		n_postfix++;
	if(data->flags & LCD14_MILLI)
		n_postfix++;
	if(data->flags & LCD14_KILO)
		n_postfix++;
	if(data->flags & LCD14_MEGA)
		n_postfix++;

	if(n_postfix > 1)
		return FALSE;

	/* Does the packet "measure" more than one type of value ?*/
	if(data->flags & LCD14_HZ)
		n_type++;
	if(data->flags & LCD14_OHM)
		n_type++;
	if(data->flags & LCD14_FARAD)
		n_type++;
	if(data->flags & LCD14_AMP)
		n_type++;
	if(data->flags & LCD14_VOLT)
		n_type++;
	if(data->flags & LCD14_DUTY)
		n_type++;
	if(data->flags & LCD14_CELSIUS)
		n_type++;
	/* Do not test for hFE. hFE is not implemented and always '1' */
	if(n_type > 1)
		return FALSE;

	/* Both AC and DC ? */
	if( (data->flags & LCD14_AC) && (data->flags & LCD14_DC) )
		return FALSE;

	/* OK, no duplicates */
	return TRUE;
}

/* We "cook" a raw lcd14_pcaket into a more pallatable form, lcd14_data */
static void lcd14_cook_raw(const lcd14_packet *packet, lcd14_data * data)
{
	size_t i;

	/* Get the digits out */
	for(i = 0; i < 4; i++)
	{
		size_t j = (i << 1) + 1;
		data->digit[i] = ( (packet->raw[j] & ~LCD14_SYNC_MASK) << 4 ) |
				 ( (packet->raw[j+1] & ~LCD14_SYNC_MASK) );
	}

	/* Now extract the flags */
	data->flags = ( (packet->raw[0] & ~LCD14_SYNC_MASK) << 20) |
		      ( (packet->raw[9] & ~LCD14_SYNC_MASK) << 16) |
		      ( (packet->raw[10]& ~LCD14_SYNC_MASK) << 12) |
		      ( (packet->raw[11]& ~LCD14_SYNC_MASK) <<  8) |
		      ( (packet->raw[12]& ~LCD14_SYNC_MASK) <<  4) |
		      ( (packet->raw[13]& ~LCD14_SYNC_MASK) );
}


/* Since the DMM does not identify itslef in any way shape, or form, we really
 * don't know for sure who is sending the data. We must use every possible
 * check to filter out bad packets, especially since detection mechanism depends
 * on how well we can filter out bad packets packets */
SR_PRIV gboolean lcd14_is_packet_valid(const lcd14_packet *packet,
				       lcd14_data *data)
{
	/* Callers not interested in the data, pass NULL */
	lcd14_data placeholder;
	if(data == NULL)
		data = &placeholder;
	/* We start with our syncronization nibbles, then move to more advanced
	 * checks */
	if(!lcd14_is_sync_valid(packet))
		return FALSE;

	lcd14_cook_raw(packet, data);

	if(!lcd14_is_selection_good(data))
		return FALSE;

	/* Made it here, huh? Then this looks to be a valid packet */
	return TRUE;
}

static uint8_t lcd14_to_digit(uint8_t raw_digit)
{
	/* Take out the decimal point, so we can use a simple switch() */
	raw_digit &= ~LCD14_DP_MASK;
	switch(raw_digit)
	{
	case 0x00:
	case LCD14_LCD_0:
		return 0;
	case LCD14_LCD_1:
		return 1;
	case LCD14_LCD_2:
		return 2;
	case LCD14_LCD_3:
		return 3;
	case LCD14_LCD_4:
		return 4;
	case LCD14_LCD_5:
		return 5;
	case LCD14_LCD_6:
		return 6;
	case LCD14_LCD_7:
		return 7;
	case LCD14_LCD_8:
		return 8;
	case LCD14_LCD_9:
		return 9;
	default:
		return LCD14_LCD_INVALID;
	}
}

static double lcdraw_to_double(lcd14_data *data)
{
	/* *********************************************************************
	 * Get a raw floating point value from the data
	 **********************************************************************/
	double rawval;
	double multiplier = 1;
	uint8_t digit;
	gboolean dp_reached = FALSE;
	int i;

	/* We have 4 digits, and we start from the most significant */
	for(i = 0; i < 4; i++)
	{
		uint8_t raw_digit = data->digit[i];
		digit = lcd14_to_digit(raw_digit);
		if(digit == LCD14_LCD_INVALID) {
			rawval = NAN;
			break;
		}
		/* Digit 1 does not have a decimal point. Instead, the decimal
		 * point is used to indicate MAX, so we must avoid testing it */
		if( (i > 0) && (raw_digit & LCD14_DP_MASK) )
			dp_reached = TRUE;
		if(dp_reached) multiplier /= 10;
		rawval = rawval * 10 + digit;
	}
	rawval *= multiplier;
	if(data->digit[0] & LCD14_D0_NEG)
		rawval *= -1;

	/* See if we need to multiply our raw value by anything */
	if(data->flags & LCD14_NANO) {
		rawval *= 1E-9;
	} else if(data->flags & LCD14_MICRO) {
		rawval *= 1E-6;
	} else if(data->flags & LCD14_MILLI) {
		rawval *= 1E-3;
	} else if(data->flags & LCD14_KILO) {
		rawval *= 1E3;
	} else if(data->flags & LCD14_MEGA) {
		rawval *= 1E6;
	}

	return rawval;
}

static void lcd14_handle_packet(lcd14_data *data, struct dev_context *devc)
{
	double rawval = lcdraw_to_double(data);
	/* *********************************************************************
	 * Now see what the value means, and pass that on
	 **********************************************************************/
	struct sr_datafeed_packet packet;
	struct sr_datafeed_analog *analog;

	if( !(analog = g_try_malloc0(sizeof(struct sr_datafeed_analog))) ) {
		sr_err("failed to malloc packet");
		return;
	}
	analog->num_samples = 1;
	if( !(analog->data = g_try_malloc(sizeof(float))) ) {
		sr_err("failed to malloc data");
		g_free(analog);
		return;
	}
	*analog->data = (float)rawval;
	analog->mq = -1;

	/* What does the data mean ? */
	if(data->flags & LCD14_VOLT) {
		analog->mq = SR_MQ_VOLTAGE;
		analog->unit = SR_UNIT_VOLT;
		if(data->flags & LCD14_AC)
			analog->mqflags |= SR_MQFLAG_AC;
		else
			analog->mqflags |= SR_MQFLAG_DC;
	}
	else if(data->flags & LCD14_AMP) {
		analog->mq = SR_MQ_CURRENT;
		analog->unit = SR_UNIT_AMPERE;
		if(data->flags & LCD14_AC)
			analog->mqflags |= SR_MQFLAG_AC;
		else
			analog->mqflags |= SR_MQFLAG_DC;
	}
	else if(data->flags & LCD14_OHM) {
		if(data->flags & LCD14_BEEP)
			analog->mq = SR_MQ_CONTINUITY;
		else
			analog->mq = SR_MQ_RESISTANCE;
		if(!isnan(rawval) )
			analog->unit = SR_UNIT_OHM;
		else {
			analog->unit = SR_UNIT_BOOLEAN;
			*analog->data = FALSE;
		}
	}
	else if(data->flags & LCD14_FARAD) {
		analog->mq = SR_MQ_CAPACITANCE;
		analog->unit = SR_UNIT_FARAD;
	}
	else if(data->flags & LCD14_CELSIUS) {
		analog->mq = SR_MQ_TEMPERATURE;
		/* No Kelvin or Fahrenheit from the deive, just Celsius */
		analog->unit = SR_UNIT_CELSIUS;
	}
	else if(data->flags & LCD14_HZ) {
		analog->mq = SR_MQ_FREQUENCY;
		analog->unit = SR_UNIT_HERTZ;
	}
	else if(data->flags & LCD14_DUTY) {
		analog->mq = SR_MQ_DUTY_CYCLE;
		analog->unit = SR_UNIT_PERCENTAGE;
	}
	else if(data->flags & LCD14_HFE) {
		analog->mq = SR_MQ_GAIN;
		analog->unit = SR_UNIT_UNITLESS;
	}
	else if(data->flags & LCD14_DIODE) {
		analog->mq = SR_MQ_VOLTAGE;
		analog->unit = SR_UNIT_VOLT;
		analog->mqflags |= SR_MQFLAG_DIODE | SR_MQFLAG_DC;
	}
	else {
		sr_warn("unable to identify measurement mode");
	}

	/* What other flags are associated with the data? */
	if(data->flags & LCD14_HOLD) {
		analog->mqflags |= SR_MQFLAG_HOLD;
	}
	if(data->flags & LCD14_AUTO) {
		analog->mqflags |= SR_MQFLAG_AUTORANGE;
	}
	if(data->flags & LCD14_REL) {
		analog->mqflags |= SR_MQFLAG_RELATIVE;
	}

	if (analog->mq != -1) {
		/* Got a measurement. */
		sr_spew("val %f", rawval);
		packet.type = SR_DF_ANALOG;
		packet.payload = analog;
		sr_session_send(devc->cb_data, &packet);
		devc->num_samples++;
	}
	g_free(analog->data);
	g_free(analog);
}

static void handle_new_data(struct dev_context *devc, int fd)
{
	int len;
	size_t i;
	size_t offset = 0;
	/* Try to get as much data as the buffer can hold */
	len = DMM_BUFSIZE - devc->buflen;
	len = serial_read(fd, devc->buf + devc->buflen, len);
	if (len < 1) {
		sr_err("serial port read error!");
		return;
	}
	devc->buflen += len;

	/* Now look for packets in that data */
	while((devc->buflen - offset) >= LCD14_PACKET_SIZE)
	{
		lcd14_packet * packet = (void *)(devc->buf + offset);
		lcd14_data data;
		if( lcd14_is_packet_valid(packet, &data) )
		{
			lcd14_handle_packet(&data, devc);
			offset += LCD14_PACKET_SIZE;
		} else {
			offset++;
		}
	}

	/* If we have any data left, move it to the beginning of our buffer */
	for(i = 0; i < devc->buflen - offset; i++)
		devc->buf[i] = devc->buf[offset + i];
	devc->buflen -= offset;
}

SR_PRIV int lcd14_receive_data(int fd, int revents, void *cb_data)
{
	const struct sr_dev_inst *sdi;
	struct dev_context *devc;

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

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

	if (revents == G_IO_IN)
	{
		/* Serial data arrived. */
		handle_new_data(devc, fd);
	}

	if (devc->num_samples >= devc->limit_samples) {
		sdi->driver->dev_acquisition_stop(sdi, cb_data);
		return TRUE;
	}

	return TRUE;
}
Commit	Line	Data
7dc55d93 AG	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
	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	#include <glib.h>
	21	#include "libsigrok.h"
	22	#include "libsigrok-internal.h"
	23	#include "config.h"
	24	#include "protocol.h"
	25	#include <stdlib.h>
	26	#include <math.h>
	27	#include <string.h>
	28	#include <errno.h>
	29
	30
	31	static gboolean lcd14_is_sync_valid(const lcd14_packet *packet)
	32	{
	33	size_t i;
	34	/* Check the syncronization nibbles, and make sure they all match */
	35	for(i = 0; i < LCD14_PACKET_SIZE; i++)
	36	{
	37	uint8_t sync = (packet->raw[i] & LCD14_SYNC_MASK) >> 4;
	38	if(sync != (i+1) )
	39	return FALSE;
	40	}
	41	return TRUE;
	42	}
	43
	44	static gboolean lcd14_is_selection_good(const lcd14_data *data)
	45	{
	46	int n_postfix = 0;
	47	int n_type = 0;
	48	/* Does the packet have more than one multiplier ? */
	49	if(data->flags & LCD14_NANO)
	50	n_postfix++;
	51	if(data->flags & LCD14_MICRO)
	52	n_postfix++;
	53	if(data->flags & LCD14_MILLI)
	54	n_postfix++;
	55	if(data->flags & LCD14_KILO)
	56	n_postfix++;
	57	if(data->flags & LCD14_MEGA)
	58	n_postfix++;
	59
	60	if(n_postfix > 1)
	61	return FALSE;
	62
	63	/* Does the packet "measure" more than one type of value ?*/
	64	if(data->flags & LCD14_HZ)
65	n_type++;
66	if(data->flags & LCD14_OHM)
67	n_type++;
68	if(data->flags & LCD14_FARAD)
69	n_type++;
70	if(data->flags & LCD14_AMP)
71	n_type++;
72	if(data->flags & LCD14_VOLT)
73	n_type++;
74	if(data->flags & LCD14_DUTY)
75	n_type++;
76	if(data->flags & LCD14_CELSIUS)
77	n_type++;
78	/* Do not test for hFE. hFE is not implemented and always '1' */
79	if(n_type > 1)
80	return FALSE;
81
82	/* Both AC and DC ? */
83	if( (data->flags & LCD14_AC) && (data->flags & LCD14_DC) )
84	return FALSE;
85
86	/* OK, no duplicates */
87	return TRUE;
88	}
89
90	/* We "cook" a raw lcd14_pcaket into a more pallatable form, lcd14_data */
91	static void lcd14_cook_raw(const lcd14_packet packet, lcd14_data data)
92	{
93	size_t i;
94
95	/* Get the digits out */
96	for(i = 0; i < 4; i++)
97	{
98	size_t j = (i << 1) + 1;
99	data->digit[i] = ( (packet->raw[j] & ~LCD14_SYNC_MASK) << 4 ) \|
100	( (packet->raw[j+1] & ~LCD14_SYNC_MASK) );
101	}
102
103	/* Now extract the flags */
104	data->flags = ( (packet->raw[0] & ~LCD14_SYNC_MASK) << 20) \|
105	( (packet->raw[9] & ~LCD14_SYNC_MASK) << 16) \|
106	( (packet->raw[10]& ~LCD14_SYNC_MASK) << 12) \|
107	( (packet->raw[11]& ~LCD14_SYNC_MASK) << 8) \|
108	( (packet->raw[12]& ~LCD14_SYNC_MASK) << 4) \|
109	( (packet->raw[13]& ~LCD14_SYNC_MASK) );
110	}
111
112
113	/* Since the DMM does not identify itslef in any way shape, or form, we really
114	* don't know for sure who is sending the data. We must use every possible
115	* check to filter out bad packets, especially since detection mechanism depends
116	* on how well we can filter out bad packets packets */
117	SR_PRIV gboolean lcd14_is_packet_valid(const lcd14_packet *packet,
118	lcd14_data *data)
119	{
120	/* Callers not interested in the data, pass NULL */
121	lcd14_data placeholder;
122	if(data == NULL)
123	data = &placeholder;
124	/* We start with our syncronization nibbles, then move to more advanced
125	* checks */
126	if(!lcd14_is_sync_valid(packet))
127	return FALSE;
128
129	lcd14_cook_raw(packet, data);
130
131	if(!lcd14_is_selection_good(data))
132	return FALSE;
133
134	/* Made it here, huh? Then this looks to be a valid packet */
135	return TRUE;
136	}
137
138	static uint8_t lcd14_to_digit(uint8_t raw_digit)
139	{
140	/* Take out the decimal point, so we can use a simple switch() */
141	raw_digit &= ~LCD14_DP_MASK;
142	switch(raw_digit)
143	{
144	case 0x00:
145	case LCD14_LCD_0:
146	return 0;
147	case LCD14_LCD_1:
148	return 1;
149	case LCD14_LCD_2:
150	return 2;
151	case LCD14_LCD_3:
152	return 3;
153	case LCD14_LCD_4:
154	return 4;
155	case LCD14_LCD_5:
156	return 5;
157	case LCD14_LCD_6:
158	return 6;
159	case LCD14_LCD_7:
160	return 7;
161	case LCD14_LCD_8:
162	return 8;
163	case LCD14_LCD_9:
164	return 9;
165	default:
166	return LCD14_LCD_INVALID;
167	}
168	}
169
170	static double lcdraw_to_double(lcd14_data *data)
171	{
172	/* *********************************************************************
173	* Get a raw floating point value from the data
174	**********************************************************************/
175	double rawval;
176	double multiplier = 1;
177	uint8_t digit;
178	gboolean dp_reached = FALSE;
179	int i;
180
181	/* We have 4 digits, and we start from the most significant */
182	for(i = 0; i < 4; i++)
183	{
184	uint8_t raw_digit = data->digit[i];
185	digit = lcd14_to_digit(raw_digit);
186	if(digit == LCD14_LCD_INVALID) {
187	rawval = NAN;
188	break;
189	}
190	/* Digit 1 does not have a decimal point. Instead, the decimal
191	* point is used to indicate MAX, so we must avoid testing it */
192	if( (i > 0) && (raw_digit & LCD14_DP_MASK) )
193	dp_reached = TRUE;
194	if(dp_reached) multiplier /= 10;
195	rawval = rawval * 10 + digit;
196	}
197	rawval *= multiplier;
198	if(data->digit[0] & LCD14_D0_NEG)
199	rawval *= -1;
200
201	/* See if we need to multiply our raw value by anything */
202	if(data->flags & LCD14_NANO) {
203	rawval *= 1E-9;
204	} else if(data->flags & LCD14_MICRO) {
205	rawval *= 1E-6;
206	} else if(data->flags & LCD14_MILLI) {
207	rawval *= 1E-3;
208	} else if(data->flags & LCD14_KILO) {
209	rawval *= 1E3;
210	} else if(data->flags & LCD14_MEGA) {
211	rawval *= 1E6;
212	}
213
214	return rawval;
215	}
216
217	static void lcd14_handle_packet(lcd14_data data, struct dev_context devc)
218	{
219	double rawval = lcdraw_to_double(data);
220	/* *********************************************************************
221	* Now see what the value means, and pass that on
222	**********************************************************************/
223	struct sr_datafeed_packet packet;
224	struct sr_datafeed_analog *analog;
225
226	if( !(analog = g_try_malloc0(sizeof(struct sr_datafeed_analog))) ) {
227	sr_err("failed to malloc packet");
228	return;
229	}
230	analog->num_samples = 1;
231	if( !(analog->data = g_try_malloc(sizeof(float))) ) {
232	sr_err("failed to malloc data");
233	g_free(analog);
234	return;
235	}
236	*analog->data = (float)rawval;
237	analog->mq = -1;
238
239	/* What does the data mean ? */
240	if(data->flags & LCD14_VOLT) {
241	analog->mq = SR_MQ_VOLTAGE;
242	analog->unit = SR_UNIT_VOLT;
243	if(data->flags & LCD14_AC)
244	analog->mqflags \|= SR_MQFLAG_AC;
245	else
246	analog->mqflags \|= SR_MQFLAG_DC;
247	}
248	else if(data->flags & LCD14_AMP) {
249	analog->mq = SR_MQ_CURRENT;
250	analog->unit = SR_UNIT_AMPERE;
251	if(data->flags & LCD14_AC)
252	analog->mqflags \|= SR_MQFLAG_AC;
253	else
254	analog->mqflags \|= SR_MQFLAG_DC;
255	}
256	else if(data->flags & LCD14_OHM) {
257	if(data->flags & LCD14_BEEP)
258	analog->mq = SR_MQ_CONTINUITY;
259	else
260	analog->mq = SR_MQ_RESISTANCE;
261	if(!isnan(rawval) )
262	analog->unit = SR_UNIT_OHM;
263	else {
264	analog->unit = SR_UNIT_BOOLEAN;
265	*analog->data = FALSE;
266	}
267	}
268	else if(data->flags & LCD14_FARAD) {
269	analog->mq = SR_MQ_CAPACITANCE;
270	analog->unit = SR_UNIT_FARAD;
271	}
272	else if(data->flags & LCD14_CELSIUS) {
273	analog->mq = SR_MQ_TEMPERATURE;
274	/* No Kelvin or Fahrenheit from the deive, just Celsius */
275	analog->unit = SR_UNIT_CELSIUS;
276	}
277	else if(data->flags & LCD14_HZ) {
278	analog->mq = SR_MQ_FREQUENCY;
279	analog->unit = SR_UNIT_HERTZ;
280	}
281	else if(data->flags & LCD14_DUTY) {
282	analog->mq = SR_MQ_DUTY_CYCLE;
283	analog->unit = SR_UNIT_PERCENTAGE;
284	}
285	else if(data->flags & LCD14_HFE) {
286	analog->mq = SR_MQ_GAIN;
287	analog->unit = SR_UNIT_UNITLESS;
288	}
289	else if(data->flags & LCD14_DIODE) {
290	analog->mq = SR_MQ_VOLTAGE;
291	analog->unit = SR_UNIT_VOLT;
292	analog->mqflags \|= SR_MQFLAG_DIODE \| SR_MQFLAG_DC;
293	}
294	else {
295	sr_warn("unable to identify measurement mode");
296	}
297
298	/* What other flags are associated with the data? */
299	if(data->flags & LCD14_HOLD) {
300	analog->mqflags \|= SR_MQFLAG_HOLD;
301	}
302	if(data->flags & LCD14_AUTO) {
303	analog->mqflags \|= SR_MQFLAG_AUTORANGE;
304	}
305	if(data->flags & LCD14_REL) {
306	analog->mqflags \|= SR_MQFLAG_RELATIVE;
307	}
308
309	if (analog->mq != -1) {
310	/* Got a measurement. */
311	sr_spew("val %f", rawval);
312	packet.type = SR_DF_ANALOG;
313	packet.payload = analog;
314	sr_session_send(devc->cb_data, &packet);
315	devc->num_samples++;
316	}
317	g_free(analog->data);
318	g_free(analog);
319	}
320
321	static void handle_new_data(struct dev_context *devc, int fd)
322	{
323	int len;
324	size_t i;
325	size_t offset = 0;
326	/* Try to get as much data as the buffer can hold */
327	len = DMM_BUFSIZE - devc->buflen;
328	len = serial_read(fd, devc->buf + devc->buflen, len);
329	if (len < 1) {
330	sr_err("serial port read error!");
331	return;
332	}
333	devc->buflen += len;
334
335	/* Now look for packets in that data */
336	while((devc->buflen - offset) >= LCD14_PACKET_SIZE)
337	{
338	lcd14_packet * packet = (void *)(devc->buf + offset);
339	lcd14_data data;
340	if( lcd14_is_packet_valid(packet, &data) )
341	{
342	lcd14_handle_packet(&data, devc);
343	offset += LCD14_PACKET_SIZE;
344	} else {
345	offset++;
346	}
347	}
348
349	/* If we have any data left, move it to the beginning of our buffer */
350	for(i = 0; i < devc->buflen - offset; i++)
351	devc->buf[i] = devc->buf[offset + i];
352	devc->buflen -= offset;
353	}
354
355	SR_PRIV int lcd14_receive_data(int fd, int revents, void *cb_data)
356	{
357	const struct sr_dev_inst *sdi;
358	struct dev_context *devc;
359
360	if (!(sdi = cb_data))
361	return TRUE;
362
363	if (!(devc = sdi->priv))
364	return TRUE;
365
366	if (revents == G_IO_IN)
367	{
368	/* Serial data arrived. */
369	handle_new_data(devc, fd);
370	}
371
372	if (devc->num_samples >= devc->limit_samples) {
373	sdi->driver->dev_acquisition_stop(sdi, cb_data);
374	return TRUE;
375	}
376
377	return TRUE;
378	}