[libsigrok.git] / hardware / cem-dt-885x / protocol.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2013 Bert Vermeulen <bert@biot.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 <string.h>
#include "protocol.h"

/* Length of expected payload for each token. */
static int token_payloads[][2] = {
	{ TOKEN_WEIGHT_TIME_FAST, 0 },
	{ TOKEN_WEIGHT_TIME_SLOW, 0 },
	{ TOKEN_HOLD_MAX, 0 },
	{ TOKEN_HOLD_MIN, 0 },
	{ TOKEN_TIME, 3 },
	{ TOKEN_MEAS_RANGE_OVER, 0 },
	{ TOKEN_MEAS_RANGE_UNDER, 0 },
	{ TOKEN_STORE_FULL, 0 },
	{ TOKEN_RECORDING_ON, 0 },
	{ TOKEN_MEAS_WAS_READOUT, 1 },
	{ TOKEN_MEAS_WAS_BARGRAPH, 0 },
	{ TOKEN_MEASUREMENT, 2 },
	{ TOKEN_HOLD_NONE, 0 },
	{ TOKEN_BATTERY_LOW, 0 },
	{ TOKEN_MEAS_RANGE_OK, 0 },
	{ TOKEN_STORE_OK, 0 },
	{ TOKEN_RECORDING_OFF, 0 },
	{ TOKEN_WEIGHT_FREQ_A, 1 },
	{ TOKEN_WEIGHT_FREQ_C, 1 },
	{ TOKEN_BATTERY_OK, 0 },
	{ TOKEN_MEAS_RANGE_30_80, 0 },
	{ TOKEN_MEAS_RANGE_30_130, 0 },
	{ TOKEN_MEAS_RANGE_50_100, 0 },
	{ TOKEN_MEAS_RANGE_80_130, 0 },
};

static int find_token_payload_len(unsigned char c)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(token_payloads); i++) {
		if (token_payloads[i][0] == c)
			return token_payloads[i][1];
	}

	return -1;
}

/* Process measurement or setting (0xa5 command). */
static void process_mset(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_analog analog;
	GString *dbg;
	float fvalue;
	int i;

	devc = sdi->priv;
	if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
		dbg = g_string_sized_new(128);
		g_string_printf(dbg, "got command 0x%.2x token 0x%.2x",
				devc->cmd, devc->token);
		if (devc->buf_len) {
			g_string_append_printf(dbg, " payload");
			for (i = 0; i < devc->buf_len; i++)
				g_string_append_printf(dbg, " %.2x", devc->buf[i]);
		}
		sr_spew("%s", dbg->str);
		g_string_free(dbg, TRUE);
	}

	switch(devc->token) {
	case TOKEN_WEIGHT_TIME_FAST:
		devc->cur_mqflags |= SR_MQFLAG_SPL_TIME_WEIGHT_F;
		devc->cur_mqflags &= ~SR_MQFLAG_SPL_TIME_WEIGHT_S;
		break;
	case TOKEN_WEIGHT_TIME_SLOW:
		devc->cur_mqflags |= SR_MQFLAG_SPL_TIME_WEIGHT_S;
		devc->cur_mqflags &= ~SR_MQFLAG_SPL_TIME_WEIGHT_F;
		break;
	case TOKEN_WEIGHT_FREQ_A:
		devc->cur_mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_A;
		devc->cur_mqflags &= ~SR_MQFLAG_SPL_FREQ_WEIGHT_C;
		break;
	case TOKEN_WEIGHT_FREQ_C:
		devc->cur_mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_C;
		devc->cur_mqflags &= ~SR_MQFLAG_SPL_FREQ_WEIGHT_A;
		break;
	case TOKEN_HOLD_MAX:
		devc->cur_mqflags |= SR_MQFLAG_HOLD | SR_MQFLAG_MAX;
		devc->cur_mqflags &= ~SR_MQFLAG_MIN;
		break;
	case TOKEN_HOLD_MIN:
		devc->cur_mqflags |= SR_MQFLAG_HOLD | SR_MQFLAG_MIN;
		devc->cur_mqflags &= ~SR_MQFLAG_MAX;
		break;
	case TOKEN_HOLD_NONE:
		devc->cur_mqflags &= ~(SR_MQFLAG_MAX | SR_MQFLAG_MIN | SR_MQFLAG_HOLD);
		break;
	case TOKEN_MEASUREMENT:
		fvalue = ((devc->buf[0] & 0xf0) >> 4) * 100;
		fvalue += (devc->buf[0] & 0x0f) * 10;
		fvalue += ((devc->buf[1] & 0xf0) >> 4);
		fvalue += (devc->buf[1] & 0x0f) / 10.0;
		devc->last_spl = fvalue;
		break;
	case TOKEN_MEAS_WAS_READOUT:
	case TOKEN_MEAS_WAS_BARGRAPH:
		if (devc->cur_mqflags & (SR_MQFLAG_MAX | SR_MQFLAG_MIN)) {
			if (devc->token == TOKEN_MEAS_WAS_BARGRAPH) {
				/* The device still sends bargraph measurements even
				 * when in max/min hold mode. Suppress them here, unless
				 * they're readout values. This duplicates the behavior
				 * of the device display exactly. */
				break;
			}
		}
		memset(&analog, 0, sizeof(struct sr_datafeed_analog));
		analog.mq = SR_MQ_SOUND_PRESSURE_LEVEL;
		analog.mqflags = devc->cur_mqflags;
		analog.unit = SR_UNIT_DECIBEL_SPL;
		analog.probes = sdi->probes;
		analog.num_samples = 1;
		analog.data = &devc->last_spl;
		packet.type = SR_DF_ANALOG;
		packet.payload = &analog;
		sr_session_send(devc->cb_data, &packet);

		devc->num_samples++;
		if (devc->limit_samples && devc->num_samples >= devc->limit_samples)
			sdi->driver->dev_acquisition_stop((struct sr_dev_inst *)sdi,
					devc->cb_data);
		break;
	case TOKEN_RECORDING_ON:
		devc->recording = TRUE;
		break;
	case TOKEN_RECORDING_OFF:
		devc->recording = FALSE;
		break;
	case TOKEN_TIME:
	case TOKEN_STORE_OK:
	case TOKEN_STORE_FULL:
	case TOKEN_BATTERY_OK:
	case TOKEN_BATTERY_LOW:
	case TOKEN_MEAS_RANGE_OK:
	case TOKEN_MEAS_RANGE_OVER:
	case TOKEN_MEAS_RANGE_UNDER:
	case TOKEN_MEAS_RANGE_30_80:
	case TOKEN_MEAS_RANGE_30_130:
	case TOKEN_MEAS_RANGE_50_100:
	case TOKEN_MEAS_RANGE_80_130:
		/* Not useful, or not expressable in sigrok. */
		break;
	}

}

static void process_byte(const struct sr_dev_inst *sdi, const unsigned char c,
		int handle_packets)
{
	struct dev_context *devc;
	gint64 cur_time;
	int len;

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

	if (c == 0xff) {
		/* Device is in hold mode */
		devc->cur_mqflags |= SR_MQFLAG_HOLD;

		if (devc->hold_last_sent == 0) {
			/* First hold notification. */
			devc->hold_last_sent = g_get_monotonic_time();
			/* When the device leaves hold mode, it starts from scratch. */
			devc->state = ST_INIT;
		} else {
			cur_time = g_get_monotonic_time();
			if (cur_time - devc->hold_last_sent > HOLD_REPEAT_INTERVAL) {
				/* Force the last measurement out again. */
				devc->cmd = 0xa5;
				devc->token = TOKEN_MEAS_WAS_READOUT;
				if (handle_packets)
					process_mset(sdi);
				devc->hold_last_sent = cur_time;
			}
		}

		return;
	}
	devc->cur_mqflags &= ~SR_MQFLAG_HOLD;
	devc->hold_last_sent = 0;

	if (devc->state == ST_INIT) {
		if (c == 0xa5) {
			devc->cmd = c;
			devc->token = 0x00;
			devc->state = ST_GET_TOKEN;
		} else if (c == 0xbb) {
			devc->cmd = c;
			devc->buf_len = 0;
			devc->state = ST_GET_LOG;
		}
	} else if (devc->state == ST_GET_TOKEN) {
		devc->token = c;
		devc->buf_len = 0;
		len = find_token_payload_len(devc->token);
		if (len == -1 || len > 0) {
			devc->buf_len = 0;
			devc->state = ST_GET_DATA;
		} else {
			if (handle_packets)
				process_mset(sdi);
			devc->state = ST_INIT;
		}
	} else if (devc->state == ST_GET_DATA) {
		len = find_token_payload_len(devc->token);
		if (len == -1) {
			/* We don't know this token. */
			sr_dbg("Unknown 0xa5 token 0x%.2x", devc->token);
			if (c == 0xa5 || c == 0xbb) {
				/* Looks like a new command however. */
				if (handle_packets)
					process_mset(sdi);
				devc->state = ST_INIT;
			} else {
				devc->buf[devc->buf_len++] = c;
				if (devc->buf_len > BUF_SIZE) {
					/* Shouldn't happen, ignore. */
					devc->state = ST_INIT;
				}
			}
		} else {
			devc->buf[devc->buf_len++] = c;
			if (devc->buf_len == len) {
				if (handle_packets)
					process_mset(sdi);
				devc->state = ST_INIT;
			} else if (devc->buf_len > BUF_SIZE) {
				/* Shouldn't happen, ignore. */
				devc->state = ST_INIT;
			}
		}
	} else if (devc->state == ST_GET_LOG) {
	}

}

SR_PRIV int cem_dt_885x_receive_data(int fd, int revents, void *cb_data)
{
	const struct sr_dev_inst *sdi;
	struct sr_serial_dev_inst *serial;
	unsigned char c;

	(void)fd;

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

	serial = sdi->conn;
	if (revents == G_IO_IN) {
		if (serial_read(serial, &c, 1) != 1)
			return TRUE;
		process_byte(sdi, c, TRUE);
	}

	return TRUE;
}


static int wait_for_token(const struct sr_dev_inst *sdi, char *tokens, int timeout)
{
	struct dev_context *devc;
	struct sr_serial_dev_inst *serial;
	gint64 start_time;
	int i;
	unsigned char c;

	serial = sdi->conn;
	devc = sdi->priv;
	devc->state = ST_INIT;
	start_time = g_get_monotonic_time() / 1000;
	while (TRUE) {
		if (serial_read(serial, &c, 1) != 1)
			/* Device might have gone away. */
			return SR_ERR;
		process_byte(sdi, c, FALSE);
		if (devc->state != ST_INIT)
			/* Wait for a whole packet to get processed. */
			continue;
		for (i = 0; tokens[i] != -1; i++) {
			if (devc->token == tokens[i]) {
				sr_spew("wait_for_token: got token 0x%.2x", devc->token);
				return SR_OK;
			}
		}
		if (timeout && g_get_monotonic_time() / 1000 - start_time > timeout)
			return SR_ERR_TIMEOUT;
	}

	return SR_OK;
}

/* cmd is the command to send, tokens are the tokens that denote the state
 * which the command affects. The first token is the desired state. */
SR_PRIV int cem_dt_885x_toggle(const struct sr_dev_inst *sdi, uint8_t cmd, char *tokens)
{
	struct dev_context *devc;
	struct sr_serial_dev_inst *serial;

	serial = sdi->conn;
	devc = sdi->priv;

	/* The device doesn't respond to commands very well. The
	 * only thing to do is wait for the token that will confirm
	 * whether the command worked or not, and resend if needed. */
	while (TRUE) {
		if (serial_write(serial, (const void *)&cmd, 1) != 1)
			return SR_ERR;
		/* Notifications are sent at 2Hz minimum */
		if (wait_for_token(sdi, tokens, 510) == SR_ERR)
			return SR_ERR;
		if (devc->token == tokens[0])
			/* It worked. */
			break;
	}

	return SR_OK;
}

SR_PRIV gboolean cem_dt_885x_recording_get(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	char tokens[5];

	devc = sdi->priv;

	if (devc->recording == -1) {
		/* Didn't pick up device state yet. */
		tokens[0] = TOKEN_RECORDING_ON;
		tokens[1] = TOKEN_RECORDING_OFF;
		tokens[2] = -1;
		if (wait_for_token(sdi, tokens, 0) != SR_OK)
			return SR_ERR;
	}

	return devc->token == TOKEN_RECORDING_ON;
}

SR_PRIV int cem_dt_885x_recording_set(const struct sr_dev_inst *sdi, gboolean start)
{
	struct dev_context *devc;
	int ret;
	char tokens[5];

	devc = sdi->priv;

	/* The toggle below needs the desired state in first position. */
	if (start) {
		tokens[0] = TOKEN_RECORDING_ON;
		tokens[1] = TOKEN_RECORDING_OFF;
	} else {
		tokens[0] = TOKEN_RECORDING_OFF;
		tokens[1] = TOKEN_RECORDING_ON;
	}
	tokens[2] = -1;

	if (devc->recording == -1) {
		/* Didn't pick up device state yet. */
		if (wait_for_token(sdi, tokens, 0) != SR_OK)
			return SR_ERR;
		if (devc->token == tokens[0])
			/* Nothing to do. */
			return SR_OK;
	} else if (devc->recording == start)
		/* Nothing to do. */
		return SR_OK;

	ret = cem_dt_885x_toggle(sdi, CMD_TOGGLE_RECORDING, tokens);

	return ret;
}
Commit	Line	Data
8fa9368e BV	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2013 Bert Vermeulen <bert@biot.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
e37c4b39	20	#include <string.h>
8fa9368e BV	21	#include "protocol.h"
8fa9368e BV	22
e37c4b39 BV	23	/* Length of expected payload for each token. */
	24	static int token_payloads[][2] = {
	25	{ TOKEN_WEIGHT_TIME_FAST, 0 },
	26	{ TOKEN_WEIGHT_TIME_SLOW, 0 },
	27	{ TOKEN_HOLD_MAX, 0 },
	28	{ TOKEN_HOLD_MIN, 0 },
	29	{ TOKEN_TIME, 3 },
	30	{ TOKEN_MEAS_RANGE_OVER, 0 },
	31	{ TOKEN_MEAS_RANGE_UNDER, 0 },
	32	{ TOKEN_STORE_FULL, 0 },
	33	{ TOKEN_RECORDING_ON, 0 },
	34	{ TOKEN_MEAS_WAS_READOUT, 1 },
	35	{ TOKEN_MEAS_WAS_BARGRAPH, 0 },
	36	{ TOKEN_MEASUREMENT, 2 },
	37	{ TOKEN_HOLD_NONE, 0 },
	38	{ TOKEN_BATTERY_LOW, 0 },
	39	{ TOKEN_MEAS_RANGE_OK, 0 },
	40	{ TOKEN_STORE_OK, 0 },
	41	{ TOKEN_RECORDING_OFF, 0 },
	42	{ TOKEN_WEIGHT_FREQ_A, 1 },
	43	{ TOKEN_WEIGHT_FREQ_C, 1 },
	44	{ TOKEN_BATTERY_OK, 0 },
	45	{ TOKEN_MEAS_RANGE_30_80, 0 },
	46	{ TOKEN_MEAS_RANGE_30_130, 0 },
	47	{ TOKEN_MEAS_RANGE_50_100, 0 },
	48	{ TOKEN_MEAS_RANGE_80_130, 0 },
	49	};
	50
	51	static int find_token_payload_len(unsigned char c)
8fa9368e	52	{
e37c4b39	53	unsigned int i;
8fa9368e	54
e37c4b39 BV	55	for (i = 0; i < ARRAY_SIZE(token_payloads); i++) {
	56	if (token_payloads[i][0] == c)
	57	return token_payloads[i][1];
	58	}
	59
	60	return -1;
	61	}
	62
	63	/* Process measurement or setting (0xa5 command). */
	64	static void process_mset(const struct sr_dev_inst *sdi)
	65	{
8fa9368e	66	struct dev_context *devc;
e37c4b39 BV	67	struct sr_datafeed_packet packet;
	68	struct sr_datafeed_analog analog;
	69	GString *dbg;
	70	float fvalue;
	71	int i;
8fa9368e	72
e37c4b39 BV	73	devc = sdi->priv;
	74	if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
	75	dbg = g_string_sized_new(128);
	76	g_string_printf(dbg, "got command 0x%.2x token 0x%.2x",
	77	devc->cmd, devc->token);
	78	if (devc->buf_len) {
	79	g_string_append_printf(dbg, " payload");
	80	for (i = 0; i < devc->buf_len; i++)
	81	g_string_append_printf(dbg, " %.2x", devc->buf[i]);
	82	}
	83	sr_spew("%s", dbg->str);
	84	g_string_free(dbg, TRUE);
	85	}
	86
	87	switch(devc->token) {
	88	case TOKEN_WEIGHT_TIME_FAST:
	89	devc->cur_mqflags \|= SR_MQFLAG_SPL_TIME_WEIGHT_F;
	90	devc->cur_mqflags &= ~SR_MQFLAG_SPL_TIME_WEIGHT_S;
	91	break;
	92	case TOKEN_WEIGHT_TIME_SLOW:
	93	devc->cur_mqflags \|= SR_MQFLAG_SPL_TIME_WEIGHT_S;
	94	devc->cur_mqflags &= ~SR_MQFLAG_SPL_TIME_WEIGHT_F;
	95	break;
	96	case TOKEN_WEIGHT_FREQ_A:
	97	devc->cur_mqflags \|= SR_MQFLAG_SPL_FREQ_WEIGHT_A;
	98	devc->cur_mqflags &= ~SR_MQFLAG_SPL_FREQ_WEIGHT_C;
	99	break;
	100	case TOKEN_WEIGHT_FREQ_C:
	101	devc->cur_mqflags \|= SR_MQFLAG_SPL_FREQ_WEIGHT_C;
	102	devc->cur_mqflags &= ~SR_MQFLAG_SPL_FREQ_WEIGHT_A;
	103	break;
	104	case TOKEN_HOLD_MAX:
	105	devc->cur_mqflags \|= SR_MQFLAG_HOLD \| SR_MQFLAG_MAX;
	106	devc->cur_mqflags &= ~SR_MQFLAG_MIN;
	107	break;
	108	case TOKEN_HOLD_MIN:
	109	devc->cur_mqflags \|= SR_MQFLAG_HOLD \| SR_MQFLAG_MIN;
	110	devc->cur_mqflags &= ~SR_MQFLAG_MAX;
	111	break;
	112	case TOKEN_HOLD_NONE:
	113	devc->cur_mqflags &= ~(SR_MQFLAG_MAX \| SR_MQFLAG_MIN \| SR_MQFLAG_HOLD);
	114	break;
	115	case TOKEN_MEASUREMENT:
	116	fvalue = ((devc->buf[0] & 0xf0) >> 4) * 100;
	117	fvalue += (devc->buf[0] & 0x0f) * 10;
	118	fvalue += ((devc->buf[1] & 0xf0) >> 4);
	119	fvalue += (devc->buf[1] & 0x0f) / 10.0;
bc114328 BV	120	devc->last_spl = fvalue;
	121	break;
	122	case TOKEN_MEAS_WAS_READOUT:
	123	case TOKEN_MEAS_WAS_BARGRAPH:
	124	if (devc->cur_mqflags & (SR_MQFLAG_MAX \| SR_MQFLAG_MIN)) {
	125	if (devc->token == TOKEN_MEAS_WAS_BARGRAPH) {
	126	/* The device still sends bargraph measurements even
	127	* when in max/min hold mode. Suppress them here, unless
	128	* they're readout values. This duplicates the behavior
	129	* of the device display exactly. */
	130	break;
	131	}
	132	}
e37c4b39 BV	133	memset(&analog, 0, sizeof(struct sr_datafeed_analog));
	134	analog.mq = SR_MQ_SOUND_PRESSURE_LEVEL;
	135	analog.mqflags = devc->cur_mqflags;
	136	analog.unit = SR_UNIT_DECIBEL_SPL;
	137	analog.probes = sdi->probes;
	138	analog.num_samples = 1;
bc114328	139	analog.data = &devc->last_spl;
e37c4b39 BV	140	packet.type = SR_DF_ANALOG;
	141	packet.payload = &analog;
	142	sr_session_send(devc->cb_data, &packet);
	143
	144	devc->num_samples++;
	145	if (devc->limit_samples && devc->num_samples >= devc->limit_samples)
	146	sdi->driver->dev_acquisition_stop((struct sr_dev_inst *)sdi,
	147	devc->cb_data);
	148	break;
e1af0e85 BV	149	case TOKEN_RECORDING_ON:
	150	devc->recording = TRUE;
	151	break;
	152	case TOKEN_RECORDING_OFF:
	153	devc->recording = FALSE;
	154	break;
e37c4b39 BV	155	case TOKEN_TIME:
	156	case TOKEN_STORE_OK:
	157	case TOKEN_STORE_FULL:
e37c4b39 BV	158	case TOKEN_BATTERY_OK:
	159	case TOKEN_BATTERY_LOW:
	160	case TOKEN_MEAS_RANGE_OK:
	161	case TOKEN_MEAS_RANGE_OVER:
	162	case TOKEN_MEAS_RANGE_UNDER:
	163	case TOKEN_MEAS_RANGE_30_80:
	164	case TOKEN_MEAS_RANGE_30_130:
	165	case TOKEN_MEAS_RANGE_50_100:
	166	case TOKEN_MEAS_RANGE_80_130:
	167	/* Not useful, or not expressable in sigrok. */
	168	break;
	169	}
	170
	171	}
	172
e1af0e85 BV	173	static void process_byte(const struct sr_dev_inst *sdi, const unsigned char c,
e1af0e85 BV	174	int handle_packets)
e37c4b39 BV	175	{
e37c4b39 BV	176	struct dev_context *devc;
14cf708f	177	gint64 cur_time;
e37c4b39	178	int len;
8fa9368e BV	179
8fa9368e BV	180	if (!(devc = sdi->priv))
e37c4b39 BV	181	return;
	182
	183	if (c == 0xff) {
	184	/* Device is in hold mode */
	185	devc->cur_mqflags \|= SR_MQFLAG_HOLD;
	186
14cf708f BV	187	if (devc->hold_last_sent == 0) {
	188	/* First hold notification. */
	189	devc->hold_last_sent = g_get_monotonic_time();
	190	/* When the device leaves hold mode, it starts from scratch. */
	191	devc->state = ST_INIT;
	192	} else {
	193	cur_time = g_get_monotonic_time();
	194	if (cur_time - devc->hold_last_sent > HOLD_REPEAT_INTERVAL) {
	195	/* Force the last measurement out again. */
	196	devc->cmd = 0xa5;
	197	devc->token = TOKEN_MEAS_WAS_READOUT;
e1af0e85 BV	198	if (handle_packets)
e1af0e85 BV	199	process_mset(sdi);
14cf708f BV	200	devc->hold_last_sent = cur_time;
	201	}
	202	}
e37c4b39	203
e37c4b39 BV	204	return;
	205	}
	206	devc->cur_mqflags &= ~SR_MQFLAG_HOLD;
14cf708f	207	devc->hold_last_sent = 0;
e37c4b39 BV	208
	209	if (devc->state == ST_INIT) {
	210	if (c == 0xa5) {
	211	devc->cmd = c;
	212	devc->token = 0x00;
	213	devc->state = ST_GET_TOKEN;
	214	} else if (c == 0xbb) {
	215	devc->cmd = c;
	216	devc->buf_len = 0;
	217	devc->state = ST_GET_LOG;
	218	}
	219	} else if (devc->state == ST_GET_TOKEN) {
	220	devc->token = c;
	221	devc->buf_len = 0;
	222	len = find_token_payload_len(devc->token);
	223	if (len == -1 \|\| len > 0) {
	224	devc->buf_len = 0;
	225	devc->state = ST_GET_DATA;
	226	} else {
e1af0e85 BV	227	if (handle_packets)
e1af0e85 BV	228	process_mset(sdi);
e37c4b39 BV	229	devc->state = ST_INIT;
	230	}
	231	} else if (devc->state == ST_GET_DATA) {
	232	len = find_token_payload_len(devc->token);
	233	if (len == -1) {
	234	/* We don't know this token. */
	235	sr_dbg("Unknown 0xa5 token 0x%.2x", devc->token);
	236	if (c == 0xa5 \|\| c == 0xbb) {
	237	/* Looks like a new command however. */
e1af0e85 BV	238	if (handle_packets)
e1af0e85 BV	239	process_mset(sdi);
e37c4b39 BV	240	devc->state = ST_INIT;
	241	} else {
	242	devc->buf[devc->buf_len++] = c;
	243	if (devc->buf_len > BUF_SIZE) {
	244	/* Shouldn't happen, ignore. */
	245	devc->state = ST_INIT;
	246	}
	247	}
	248	} else {
	249	devc->buf[devc->buf_len++] = c;
	250	if (devc->buf_len == len) {
e1af0e85 BV	251	if (handle_packets)
e1af0e85 BV	252	process_mset(sdi);
e37c4b39 BV	253	devc->state = ST_INIT;
	254	} else if (devc->buf_len > BUF_SIZE) {
	255	/* Shouldn't happen, ignore. */
	256	devc->state = ST_INIT;
	257	}
	258	}
	259	} else if (devc->state == ST_GET_LOG) {
	260	}
	261
	262	}
	263
	264	SR_PRIV int cem_dt_885x_receive_data(int fd, int revents, void *cb_data)
	265	{
	266	const struct sr_dev_inst *sdi;
	267	struct sr_serial_dev_inst *serial;
	268	unsigned char c;
	269
	270	(void)fd;
	271
	272	if (!(sdi = cb_data))
8fa9368e BV	273	return TRUE;
8fa9368e BV	274
e37c4b39	275	serial = sdi->conn;
8fa9368e	276	if (revents == G_IO_IN) {
e37c4b39 BV	277	if (serial_read(serial, &c, 1) != 1)
e37c4b39 BV	278	return TRUE;
e1af0e85	279	process_byte(sdi, c, TRUE);
8fa9368e BV	280	}
	281
	282	return TRUE;
	283	}
e1af0e85 BV	284
	285
	286	static int wait_for_token(const struct sr_dev_inst sdi, char tokens, int timeout)
	287	{
	288	struct dev_context *devc;
	289	struct sr_serial_dev_inst *serial;
	290	gint64 start_time;
	291	int i;
	292	unsigned char c;
	293
	294	serial = sdi->conn;
	295	devc = sdi->priv;
	296	devc->state = ST_INIT;
	297	start_time = g_get_monotonic_time() / 1000;
	298	while (TRUE) {
	299	if (serial_read(serial, &c, 1) != 1)
	300	/* Device might have gone away. */
	301	return SR_ERR;
	302	process_byte(sdi, c, FALSE);
	303	if (devc->state != ST_INIT)
	304	/* Wait for a whole packet to get processed. */
	305	continue;
	306	for (i = 0; tokens[i] != -1; i++) {
	307	if (devc->token == tokens[i]) {
	308	sr_spew("wait_for_token: got token 0x%.2x", devc->token);
	309	return SR_OK;
	310	}
	311	}
	312	if (timeout && g_get_monotonic_time() / 1000 - start_time > timeout)
	313	return SR_ERR_TIMEOUT;
	314	}
	315
	316	return SR_OK;
	317	}
	318
	319	/* cmd is the command to send, tokens are the tokens that denote the state
	320	* which the command affects. The first token is the desired state. */
	321	SR_PRIV int cem_dt_885x_toggle(const struct sr_dev_inst sdi, uint8_t cmd, char tokens)
	322	{
	323	struct dev_context *devc;
	324	struct sr_serial_dev_inst *serial;
	325
	326	serial = sdi->conn;
	327	devc = sdi->priv;
	328
	329	/* The device doesn't respond to commands very well. The
	330	* only thing to do is wait for the token that will confirm
	331	* whether the command worked or not, and resend if needed. */
	332	while (TRUE) {
	333	if (serial_write(serial, (const void *)&cmd, 1) != 1)
	334	return SR_ERR;
	335	/* Notifications are sent at 2Hz minimum */
	336	if (wait_for_token(sdi, tokens, 510) == SR_ERR)
	337	return SR_ERR;
	338	if (devc->token == tokens[0])
	339	/* It worked. */
	340	break;
	341	}
	342
	343	return SR_OK;
	344	}
	345
	346	SR_PRIV gboolean cem_dt_885x_recording_get(const struct sr_dev_inst *sdi)
	347	{
348	struct dev_context *devc;
349	char tokens[5];
350
351	devc = sdi->priv;
352
353	if (devc->recording == -1) {
354	/* Didn't pick up device state yet. */
355	tokens[0] = TOKEN_RECORDING_ON;
356	tokens[1] = TOKEN_RECORDING_OFF;
357	tokens[2] = -1;
358	if (wait_for_token(sdi, tokens, 0) != SR_OK)
359	return SR_ERR;
360	}
361
362	return devc->token == TOKEN_RECORDING_ON;
363	}
364
365	SR_PRIV int cem_dt_885x_recording_set(const struct sr_dev_inst *sdi, gboolean start)
366	{
367	struct dev_context *devc;
368	int ret;
369	char tokens[5];
370
371	devc = sdi->priv;
372
373	/* The toggle below needs the desired state in first position. */
374	if (start) {
375	tokens[0] = TOKEN_RECORDING_ON;
376	tokens[1] = TOKEN_RECORDING_OFF;
377	} else {
378	tokens[0] = TOKEN_RECORDING_OFF;
379	tokens[1] = TOKEN_RECORDING_ON;
380	}
381	tokens[2] = -1;
382
383	if (devc->recording == -1) {
384	/* Didn't pick up device state yet. */
385	if (wait_for_token(sdi, tokens, 0) != SR_OK)
386	return SR_ERR;
387	if (devc->token == tokens[0])
388	/* Nothing to do. */
389	return SR_OK;
390	} else if (devc->recording == start)
391	/* Nothing to do. */
392	return SR_OK;
393
394	ret = cem_dt_885x_toggle(sdi, CMD_TOGGLE_RECORDING, tokens);
395
396	return ret;
397	}