[libsigrok.git] / hardware / appa-55ii / protocol.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2013 Aurelien Jacobs <aurel@gnuage.org>
 *
 * 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 <string.h>
#include <math.h>
#include "protocol.h"

typedef enum {
    LIVE_DATA    = 0x00,
    LOG_METADATA = 0x11,
    LOG_DATA     = 0x14,
    LOG_START    = 0x18,
    LOG_END      = 0x19,
} packet_type;

static gboolean appa_55ii_checksum(const uint8_t *buf)
{
	int i, size, checksum;

	size = buf[3] + 4;
	checksum = 0;
	for (i = 0; i < size; i++)
		checksum += buf[i];

	return buf[size] == (checksum & 0xFF);
}

SR_PRIV gboolean appa_55ii_packet_valid(const uint8_t *buf)
{
	if (buf[0] == 0x55 && buf[1] == 0x55 && buf[3] <= 32
			&& appa_55ii_checksum(buf))
		return TRUE;

	return FALSE;
}

static uint64_t appa_55ii_flags(const uint8_t *buf)
{
	uint8_t disp_mode;
	uint64_t flags;

	disp_mode = buf[4 + 13];
	flags = 0;
	if ((disp_mode & 0xF0) == 0x20)
		flags |= SR_MQFLAG_HOLD;
	if ((disp_mode & 0x0C) == 0x04)
		flags |= SR_MQFLAG_MAX;
	if ((disp_mode & 0x0C) == 0x08)
		flags |= SR_MQFLAG_MIN;
	if ((disp_mode & 0x0C) == 0x0C)
		flags |= SR_MQFLAG_AVG;

	return flags;
}

static float appa_55ii_temp(const uint8_t *buf, int ch)
{
	const uint8_t *ptr;
	int16_t temp;
	uint8_t flags;

	ptr = buf + 4 + 14 + 3 * ch;
	temp = RL16(ptr);
	flags = ptr[2];

	if (flags & 0x60)
		return INFINITY;
	else if (flags & 1)
		return (float)temp / 10;
	else
		return (float)temp;
}

static void appa_55ii_live_data(struct sr_dev_inst *sdi, const uint8_t *buf)
{
	struct dev_context *devc;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_analog analog;
	struct sr_channel *ch;
	float values[APPA_55II_NUM_PROBES], *val_ptr;
	int i;

	devc = sdi->priv;

	if (devc->data_source != DATA_SOURCE_LIVE)
		return;

	val_ptr = values;
	memset(&analog, 0, sizeof(analog));
	analog.num_samples = 1;
	analog.mq = SR_MQ_TEMPERATURE;
	analog.unit = SR_UNIT_CELSIUS;
	analog.mqflags = appa_55ii_flags(buf);
	analog.data = values;

	for (i = 0; i < APPA_55II_NUM_PROBES; i++) {
		ch = g_slist_nth_data(sdi->channels, i);
		if (!ch->enabled)
			continue;
		analog.channels = g_slist_append(analog.channels, ch);
		*val_ptr++ = appa_55ii_temp(buf, i);
	}

	packet.type = SR_DF_ANALOG;
	packet.payload = &analog;
	sr_session_send(devc->session_cb_data, &packet);
	g_slist_free(analog.channels);

	devc->num_samples++;
}

static void appa_55ii_log_metadata(struct sr_dev_inst *sdi, const uint8_t *buf)
{
	struct dev_context *devc;

	devc = sdi->priv;
	devc->num_log_records = (buf[5] << 8) + buf[4];
}

static void appa_55ii_log_data_parse(struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_analog analog;
	struct sr_channel *ch;
	float values[APPA_55II_NUM_PROBES], *val_ptr;
	const uint8_t *buf;
	int16_t temp;
	int offset, i;

	devc = sdi->priv;
	offset = 0;

	while (devc->log_buf_len >= 20 && devc->num_log_records > 0) {
		buf = devc->log_buf + offset;
		val_ptr = values;

		/* FIXME: Timestamp should be sent in the packet. */
		sr_dbg("Timestamp: %02d:%02d:%02d", buf[2], buf[3], buf[4]);

		memset(&analog, 0, sizeof(analog));
		analog.num_samples = 1;
		analog.mq = SR_MQ_TEMPERATURE;
		analog.unit = SR_UNIT_CELSIUS;
		analog.data = values;

		for (i = 0; i < APPA_55II_NUM_PROBES; i++) {
			temp = RL16(buf + 12 + 2 * i);
			ch = g_slist_nth_data(sdi->channels, i);
			if (!ch->enabled)
				continue;
			analog.channels = g_slist_append(analog.channels, ch);
			*val_ptr++ = temp == 0x7FFF ? INFINITY : (float)temp / 10;
		}

		packet.type = SR_DF_ANALOG;
		packet.payload = &analog;
		sr_session_send(devc->session_cb_data, &packet);
		g_slist_free(analog.channels);

		devc->num_samples++;
		devc->log_buf_len -= 20;
		offset += 20;
		devc->num_log_records--;
	}

	memmove(devc->log_buf, devc->log_buf + offset, devc->log_buf_len);
}

static void appa_55ii_log_data(struct sr_dev_inst *sdi, const uint8_t *buf)
{
	struct dev_context *devc;
	const uint8_t *ptr;
	unsigned int size;
	int s;

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

	ptr = buf + 4;
	size = buf[3];
	while (size > 0) {
		s = MIN(size, sizeof(devc->log_buf) - devc->log_buf_len);
		memcpy(devc->log_buf + devc->log_buf_len, ptr, s);
		devc->log_buf_len += s;
		size -= s;
		ptr += s;

		appa_55ii_log_data_parse(sdi);
	}
}

static void appa_55ii_log_end(struct sr_dev_inst *sdi)
{
	struct dev_context *devc;

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

	sdi->driver->dev_acquisition_stop(sdi, devc->session_cb_data);
}

static const uint8_t *appa_55ii_parse_data(struct sr_dev_inst *sdi,
		const uint8_t *buf, int len)
{
	if (len < 5)
		/* Need more data. */
		return NULL;

	if (buf[0] != 0x55 || buf[1] != 0x55)
		/* Try to re-synchronize on a packet start. */
		return buf + 1;

	if (len < 5 + buf[3])
		/* Need more data. */
		return NULL;

	if (!appa_55ii_checksum(buf))
		/* Skip broken packet. */
		return buf + 4 + buf[3] + 1;

	switch ((packet_type)buf[2]) {
	case LIVE_DATA:
		appa_55ii_live_data(sdi, buf);
		break;
	case LOG_METADATA:
		appa_55ii_log_metadata(sdi, buf);
		break;
	case LOG_DATA:
		appa_55ii_log_data(sdi, buf);
		break;
	case LOG_START:
		break;
	case LOG_END:
		appa_55ii_log_end(sdi);
		break;
	default:
		sr_warn("Invalid packet type: 0x%02x.", buf[2]);
		break;
	}

	return buf + 4 + buf[3] + 1;
}

SR_PRIV int appa_55ii_receive_data(int fd, int revents, void *cb_data)
{
	struct sr_dev_inst *sdi;
	struct dev_context *devc;
	struct sr_serial_dev_inst *serial;
	int64_t time;
	const uint8_t *ptr, *next_ptr, *end_ptr;
	int len;

	(void)fd;

	if (!(sdi = cb_data) || !(devc = sdi->priv) || revents != G_IO_IN)
		return TRUE;
	serial = sdi->conn;

	/* Try to get as much data as the buffer can hold. */
	len = sizeof(devc->buf) - devc->buf_len;
	len = serial_read(serial, devc->buf + devc->buf_len, len);
	if (len < 1) {
		sr_err("Serial port read error: %d.", len);
		return FALSE;
	}
	devc->buf_len += len;

	/* Now look for packets in that data. */
	ptr = devc->buf;
	end_ptr = ptr + devc->buf_len;
	while ((next_ptr = appa_55ii_parse_data(sdi, ptr, end_ptr - ptr)))
		ptr = next_ptr;

	/* If we have any data left, move it to the beginning of our buffer. */
	memmove(devc->buf, ptr, end_ptr - ptr);
	devc->buf_len -= ptr - devc->buf;

	/* If buffer is full and no valid packet was found, wipe buffer. */
	if (devc->buf_len >= sizeof(devc->buf)) {
		devc->buf_len = 0;
		return FALSE;
	}

	if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
		sr_info("Requested number of samples reached.");
		sdi->driver->dev_acquisition_stop(sdi, devc->session_cb_data);
		return TRUE;
	}

	if (devc->limit_msec) {
		time = (g_get_monotonic_time() - devc->start_time) / 1000;
		if (time > (int64_t)devc->limit_msec) {
			sr_info("Requested time limit reached.");
			sdi->driver->dev_acquisition_stop(sdi,
					devc->session_cb_data);
			return TRUE;
		}
	}

	return TRUE;
}
Commit	Line	Data
5e7a8e57 AJ	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2013 Aurelien Jacobs <aurel@gnuage.org>
	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
81a9ab72 AJ	20	#include <string.h>
81a9ab72 AJ	21	#include <math.h>
5e7a8e57 AJ	22	#include "protocol.h"
5e7a8e57 AJ	23
81a9ab72 AJ	24	typedef enum {
	25	LIVE_DATA = 0x00,
	26	LOG_METADATA = 0x11,
	27	LOG_DATA = 0x14,
	28	LOG_START = 0x18,
	29	LOG_END = 0x19,
9ee78f23	30	} packet_type;
81a9ab72 AJ	31
	32	static gboolean appa_55ii_checksum(const uint8_t *buf)
	33	{
7574e58c BV	34	int i, size, checksum;
	35
	36	size = buf[3] + 4;
	37	checksum = 0;
	38	for (i = 0; i < size; i++)
81a9ab72	39	checksum += buf[i];
7574e58c	40
81a9ab72 AJ	41	return buf[size] == (checksum & 0xFF);
	42	}
	43
	44	SR_PRIV gboolean appa_55ii_packet_valid(const uint8_t *buf)
	45	{
	46	if (buf[0] == 0x55 && buf[1] == 0x55 && buf[3] <= 32
7574e58c	47	&& appa_55ii_checksum(buf))
81a9ab72	48	return TRUE;
7574e58c	49
81a9ab72 AJ	50	return FALSE;
	51	}
	52
	53	static uint64_t appa_55ii_flags(const uint8_t *buf)
	54	{
7574e58c BV	55	uint8_t disp_mode;
	56	uint64_t flags;
	57
	58	disp_mode = buf[4 + 13];
	59	flags = 0;
	60	if ((disp_mode & 0xF0) == 0x20)
	61	flags \|= SR_MQFLAG_HOLD;
	62	if ((disp_mode & 0x0C) == 0x04)
	63	flags \|= SR_MQFLAG_MAX;
	64	if ((disp_mode & 0x0C) == 0x08)
	65	flags \|= SR_MQFLAG_MIN;
	66	if ((disp_mode & 0x0C) == 0x0C)
	67	flags \|= SR_MQFLAG_AVG;
81a9ab72 AJ	68
	69	return flags;
	70	}
	71
ba7dd8bb	72	static float appa_55ii_temp(const uint8_t *buf, int ch)
81a9ab72	73	{
7574e58c BV	74	const uint8_t *ptr;
	75	int16_t temp;
	76	uint8_t flags;
	77
ba7dd8bb	78	ptr = buf + 4 + 14 + 3 * ch;
7574e58c BV	79	temp = RL16(ptr);
	80	flags = ptr[2];
	81
	82	if (flags & 0x60)
	83	return INFINITY;
	84	else if (flags & 1)
	85	return (float)temp / 10;
	86	else
	87	return (float)temp;
81a9ab72 AJ	88	}
	89
	90	static void appa_55ii_live_data(struct sr_dev_inst sdi, const uint8_t buf)
	91	{
76b4d4f4	92	struct dev_context *devc;
81a9ab72	93	struct sr_datafeed_packet packet;
7574e58c	94	struct sr_datafeed_analog analog;
ba7dd8bb	95	struct sr_channel *ch;
7574e58c	96	float values[APPA_55II_NUM_PROBES], *val_ptr;
81a9ab72 AJ	97	int i;
81a9ab72 AJ	98
76b4d4f4 UH	99	devc = sdi->priv;
76b4d4f4 UH	100
81a9ab72 AJ	101	if (devc->data_source != DATA_SOURCE_LIVE)
	102	return;
	103
7574e58c BV	104	val_ptr = values;
7574e58c BV	105	memset(&analog, 0, sizeof(analog));
81a9ab72 AJ	106	analog.num_samples = 1;
	107	analog.mq = SR_MQ_TEMPERATURE;
	108	analog.unit = SR_UNIT_CELSIUS;
	109	analog.mqflags = appa_55ii_flags(buf);
	110	analog.data = values;
	111
7574e58c	112	for (i = 0; i < APPA_55II_NUM_PROBES; i++) {
ba7dd8bb UH	113	ch = g_slist_nth_data(sdi->channels, i);
ba7dd8bb UH	114	if (!ch->enabled)
81a9ab72	115	continue;
ba7dd8bb	116	analog.channels = g_slist_append(analog.channels, ch);
81a9ab72 AJ	117	*val_ptr++ = appa_55ii_temp(buf, i);
	118	}
	119
	120	packet.type = SR_DF_ANALOG;
	121	packet.payload = &analog;
	122	sr_session_send(devc->session_cb_data, &packet);
ba7dd8bb	123	g_slist_free(analog.channels);
81a9ab72 AJ	124
	125	devc->num_samples++;
	126	}
	127
	128	static void appa_55ii_log_metadata(struct sr_dev_inst sdi, const uint8_t buf)
	129	{
7574e58c BV	130	struct dev_context *devc;
	131
	132	devc = sdi->priv;
81a9ab72 AJ	133	devc->num_log_records = (buf[5] << 8) + buf[4];
	134	}
	135
	136	static void appa_55ii_log_data_parse(struct sr_dev_inst *sdi)
	137	{
7574e58c BV	138	struct dev_context *devc;
7574e58c BV	139	struct sr_datafeed_packet packet;
76b4d4f4	140	struct sr_datafeed_analog analog;
ba7dd8bb	141	struct sr_channel *ch;
7574e58c BV	142	float values[APPA_55II_NUM_PROBES], *val_ptr;
	143	const uint8_t *buf;
	144	int16_t temp;
	145	int offset, i;
	146
	147	devc = sdi->priv;
	148	offset = 0;
81a9ab72 AJ	149
81a9ab72 AJ	150	while (devc->log_buf_len >= 20 && devc->num_log_records > 0) {
7574e58c BV	151	buf = devc->log_buf + offset;
7574e58c BV	152	val_ptr = values;
81a9ab72	153
76b4d4f4	154	/* FIXME: Timestamp should be sent in the packet. */
81a9ab72 AJ	155	sr_dbg("Timestamp: %02d:%02d:%02d", buf[2], buf[3], buf[4]);
81a9ab72 AJ	156
7574e58c	157	memset(&analog, 0, sizeof(analog));
81a9ab72 AJ	158	analog.num_samples = 1;
	159	analog.mq = SR_MQ_TEMPERATURE;
	160	analog.unit = SR_UNIT_CELSIUS;
	161	analog.data = values;
	162
7574e58c BV	163	for (i = 0; i < APPA_55II_NUM_PROBES; i++) {
7574e58c BV	164	temp = RL16(buf + 12 + 2 * i);
ba7dd8bb UH	165	ch = g_slist_nth_data(sdi->channels, i);
ba7dd8bb UH	166	if (!ch->enabled)
81a9ab72	167	continue;
ba7dd8bb	168	analog.channels = g_slist_append(analog.channels, ch);
81a9ab72 AJ	169	*val_ptr++ = temp == 0x7FFF ? INFINITY : (float)temp / 10;
	170	}
	171
	172	packet.type = SR_DF_ANALOG;
	173	packet.payload = &analog;
	174	sr_session_send(devc->session_cb_data, &packet);
ba7dd8bb	175	g_slist_free(analog.channels);
81a9ab72 AJ	176
	177	devc->num_samples++;
	178	devc->log_buf_len -= 20;
	179	offset += 20;
	180	devc->num_log_records--;
	181	}
	182
	183	memmove(devc->log_buf, devc->log_buf + offset, devc->log_buf_len);
	184	}
	185
	186	static void appa_55ii_log_data(struct sr_dev_inst sdi, const uint8_t buf)
	187	{
7574e58c BV	188	struct dev_context *devc;
	189	const uint8_t *ptr;
	190	unsigned int size;
	191	int s;
81a9ab72	192
7574e58c	193	devc = sdi->priv;
81a9ab72 AJ	194	if (devc->data_source != DATA_SOURCE_MEMORY)
	195	return;
	196
76b4d4f4	197	ptr = buf + 4;
7574e58c	198	size = buf[3];
81a9ab72	199	while (size > 0) {
7574e58c	200	s = MIN(size, sizeof(devc->log_buf) - devc->log_buf_len);
81a9ab72 AJ	201	memcpy(devc->log_buf + devc->log_buf_len, ptr, s);
	202	devc->log_buf_len += s;
	203	size -= s;
	204	ptr += s;
	205
	206	appa_55ii_log_data_parse(sdi);
	207	}
	208	}
	209
	210	static void appa_55ii_log_end(struct sr_dev_inst *sdi)
	211	{
7574e58c	212	struct dev_context *devc;
81a9ab72	213
7574e58c	214	devc = sdi->priv;
81a9ab72 AJ	215	if (devc->data_source != DATA_SOURCE_MEMORY)
	216	return;
	217
	218	sdi->driver->dev_acquisition_stop(sdi, devc->session_cb_data);
	219	}
	220
	221	static const uint8_t appa_55ii_parse_data(struct sr_dev_inst sdi,
7574e58c	222	const uint8_t *buf, int len)
81a9ab72 AJ	223	{
81a9ab72 AJ	224	if (len < 5)
7574e58c BV	225	/* Need more data. */
7574e58c BV	226	return NULL;
81a9ab72 AJ	227
81a9ab72 AJ	228	if (buf[0] != 0x55 \|\| buf[1] != 0x55)
7574e58c BV	229	/* Try to re-synchronize on a packet start. */
7574e58c BV	230	return buf + 1;
81a9ab72	231
7574e58c BV	232	if (len < 5 + buf[3])
	233	/* Need more data. */
	234	return NULL;
81a9ab72 AJ	235
81a9ab72 AJ	236	if (!appa_55ii_checksum(buf))
7574e58c BV	237	/* Skip broken packet. */
7574e58c BV	238	return buf + 4 + buf[3] + 1;
81a9ab72	239
9ee78f23	240	switch ((packet_type)buf[2]) {
7574e58c BV	241	case LIVE_DATA:
	242	appa_55ii_live_data(sdi, buf);
	243	break;
	244	case LOG_METADATA:
	245	appa_55ii_log_metadata(sdi, buf);
	246	break;
	247	case LOG_DATA:
	248	appa_55ii_log_data(sdi, buf);
	249	break;
	250	case LOG_START:
	251	break;
	252	case LOG_END:
	253	appa_55ii_log_end(sdi);
	254	break;
76b4d4f4 UH	255	default:
	256	sr_warn("Invalid packet type: 0x%02x.", buf[2]);
	257	break;
81a9ab72 AJ	258	}
	259
	260	return buf + 4 + buf[3] + 1;
	261	}
	262
5e7a8e57 AJ	263	SR_PRIV int appa_55ii_receive_data(int fd, int revents, void *cb_data)
5e7a8e57 AJ	264	{
81a9ab72	265	struct sr_dev_inst *sdi;
5e7a8e57	266	struct dev_context *devc;
81a9ab72	267	struct sr_serial_dev_inst *serial;
7574e58c	268	int64_t time;
81a9ab72 AJ	269	const uint8_t ptr, next_ptr, *end_ptr;
81a9ab72 AJ	270	int len;
5e7a8e57 AJ	271
	272	(void)fd;
	273
81a9ab72	274	if (!(sdi = cb_data) \|\| !(devc = sdi->priv) \|\| revents != G_IO_IN)
5e7a8e57	275	return TRUE;
81a9ab72 AJ	276	serial = sdi->conn;
	277
	278	/* Try to get as much data as the buffer can hold. */
	279	len = sizeof(devc->buf) - devc->buf_len;
	280	len = serial_read(serial, devc->buf + devc->buf_len, len);
	281	if (len < 1) {
	282	sr_err("Serial port read error: %d.", len);
	283	return FALSE;
	284	}
	285	devc->buf_len += len;
	286
	287	/* Now look for packets in that data. */
	288	ptr = devc->buf;
	289	end_ptr = ptr + devc->buf_len;
	290	while ((next_ptr = appa_55ii_parse_data(sdi, ptr, end_ptr - ptr)))
	291	ptr = next_ptr;
5e7a8e57	292
81a9ab72 AJ	293	/* If we have any data left, move it to the beginning of our buffer. */
	294	memmove(devc->buf, ptr, end_ptr - ptr);
	295	devc->buf_len -= ptr - devc->buf;
	296
	297	/* If buffer is full and no valid packet was found, wipe buffer. */
	298	if (devc->buf_len >= sizeof(devc->buf)) {
	299	devc->buf_len = 0;
	300	return FALSE;
	301	}
	302
	303	if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
	304	sr_info("Requested number of samples reached.");
	305	sdi->driver->dev_acquisition_stop(sdi, devc->session_cb_data);
5e7a8e57	306	return TRUE;
81a9ab72	307	}
5e7a8e57	308
81a9ab72	309	if (devc->limit_msec) {
7574e58c	310	time = (g_get_monotonic_time() - devc->start_time) / 1000;
81a9ab72 AJ	311	if (time > (int64_t)devc->limit_msec) {
81a9ab72 AJ	312	sr_info("Requested time limit reached.");
76b4d4f4 UH	313	sdi->driver->dev_acquisition_stop(sdi,
76b4d4f4 UH	314	devc->session_cb_data);
81a9ab72 AJ	315	return TRUE;
81a9ab72 AJ	316	}
5e7a8e57 AJ	317	}
	318
	319	return TRUE;
	320	}