[libsigrok.git] / src / hardware / openbench-logic-sniffer / 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 <config.h>
#include "protocol.h"

SR_PRIV int send_shortcommand(struct sr_serial_dev_inst *serial,
		uint8_t command)
{
	char buf[1];

	sr_dbg("Sending cmd 0x%.2x.", command);
	buf[0] = command;
	if (serial_write_blocking(serial, buf, 1, serial_timeout(serial, 1)) != 1)
		return SR_ERR;

	if (serial_drain(serial) != 0)
		return SR_ERR;

	return SR_OK;
}

SR_PRIV int send_longcommand(struct sr_serial_dev_inst *serial,
		uint8_t command, uint8_t *data)
{
	char buf[5];

	sr_dbg("Sending cmd 0x%.2x data 0x%.2x%.2x%.2x%.2x.", command,
			data[0], data[1], data[2], data[3]);
	buf[0] = command;
	buf[1] = data[0];
	buf[2] = data[1];
	buf[3] = data[2];
	buf[4] = data[3];
	if (serial_write_blocking(serial, buf, 5, serial_timeout(serial, 1)) != 5)
		return SR_ERR;

	if (serial_drain(serial) != 0)
		return SR_ERR;

	return SR_OK;
}

SR_PRIV int ols_send_reset(struct sr_serial_dev_inst *serial)
{
	unsigned int i;

	for (i = 0; i < 5; i++) {
		if (send_shortcommand(serial, CMD_RESET) != SR_OK)
			return SR_ERR;
	}

	return SR_OK;
}

/* Configures the channel mask based on which channels are enabled. */
SR_PRIV void ols_channel_mask(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	struct sr_channel *channel;
	const GSList *l;

	devc = sdi->priv;

	devc->channel_mask = 0;
	for (l = sdi->channels; l; l = l->next) {
		channel = l->data;
		if (channel->enabled)
			devc->channel_mask |= 1 << channel->index;
	}
}

SR_PRIV int ols_convert_trigger(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	struct sr_trigger *trigger;
	struct sr_trigger_stage *stage;
	struct sr_trigger_match *match;
	const GSList *l, *m;
	int i;

	devc = sdi->priv;

	devc->num_stages = 0;
	for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
		devc->trigger_mask[i] = 0;
		devc->trigger_value[i] = 0;
	}

	if (!(trigger = sr_session_trigger_get(sdi->session)))
		return SR_OK;

	devc->num_stages = g_slist_length(trigger->stages);
	if (devc->num_stages > NUM_TRIGGER_STAGES) {
		sr_err("This device only supports %d trigger stages.",
				NUM_TRIGGER_STAGES);
		return SR_ERR;
	}

	for (l = trigger->stages; l; l = l->next) {
		stage = l->data;
		for (m = stage->matches; m; m = m->next) {
			match = m->data;
			if (!match->channel->enabled)
				/* Ignore disabled channels with a trigger. */
				continue;
			devc->trigger_mask[stage->stage] |= 1 << match->channel->index;
			if (match->match == SR_TRIGGER_ONE)
				devc->trigger_value[stage->stage] |= 1 << match->channel->index;
		}
	}

	return SR_OK;
}

SR_PRIV struct dev_context *ols_dev_new(void)
{
	struct dev_context *devc;

	devc = g_malloc0(sizeof(struct dev_context));

	/* Device-specific settings */
	devc->max_samples = devc->max_samplerate = devc->protocol_version = 0;

	/* Acquisition settings */
	devc->limit_samples = devc->capture_ratio = 0;
	devc->trigger_at = -1;
	devc->flag_reg = 0;

	return devc;
}

SR_PRIV struct sr_dev_inst *get_metadata(struct sr_serial_dev_inst *serial)
{
	struct sr_dev_inst *sdi;
	struct dev_context *devc;
	uint32_t tmp_int, ui;
	uint8_t key, type, token;
	int delay_ms;
	GString *tmp_str, *devname, *version;
	guchar tmp_c;

	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	sdi->status = SR_ST_INACTIVE;
	devc = ols_dev_new();
	sdi->priv = devc;

	devname = g_string_new("");
	version = g_string_new("");

	key = 0xff;
	while (key) {
		delay_ms = serial_timeout(serial, 1);
		if (serial_read_blocking(serial, &key, 1, delay_ms) != 1)
			break;
		if (key == 0x00) {
			sr_dbg("Got metadata key 0x00, metadata ends.");
			break;
		}
		type = key >> 5;
		token = key & 0x1f;
		switch (type) {
		case 0:
			/* NULL-terminated string */
			tmp_str = g_string_new("");
			delay_ms = serial_timeout(serial, 1);
			while (serial_read_blocking(serial, &tmp_c, 1, delay_ms) == 1 && tmp_c != '\0')
				g_string_append_c(tmp_str, tmp_c);
			sr_dbg("Got metadata key 0x%.2x value '%s'.",
			       key, tmp_str->str);
			switch (token) {
			case 0x01:
				/* Device name */
				devname = g_string_append(devname, tmp_str->str);
				break;
			case 0x02:
				/* FPGA firmware version */
				if (version->len)
					g_string_append(version, ", ");
				g_string_append(version, "FPGA version ");
				g_string_append(version, tmp_str->str);
				break;
			case 0x03:
				/* Ancillary version */
				if (version->len)
					g_string_append(version, ", ");
				g_string_append(version, "Ancillary version ");
				g_string_append(version, tmp_str->str);
				break;
			default:
				sr_info("ols: unknown token 0x%.2x: '%s'",
					token, tmp_str->str);
				break;
			}
			g_string_free(tmp_str, TRUE);
			break;
		case 1:
			/* 32-bit unsigned integer */
			delay_ms = serial_timeout(serial, 4);
			if (serial_read_blocking(serial, &tmp_int, 4, delay_ms) != 4)
				break;
			tmp_int = RB32(&tmp_int);
			sr_dbg("Got metadata key 0x%.2x value 0x%.8x.",
			       key, tmp_int);
			switch (token) {
			case 0x00:
				/* Number of usable channels */
				for (ui = 0; ui < tmp_int; ui++)
					sr_channel_new(sdi, ui, SR_CHANNEL_LOGIC, TRUE,
							ols_channel_names[ui]);
				break;
			case 0x01:
				/* Amount of sample memory available (bytes) */
				devc->max_samples = tmp_int;
				break;
			case 0x02:
				/* Amount of dynamic memory available (bytes) */
				/* what is this for? */
				break;
			case 0x03:
				/* Maximum sample rate (Hz) */
				devc->max_samplerate = tmp_int;
				break;
			case 0x04:
				/* protocol version */
				devc->protocol_version = tmp_int;
				break;
			default:
				sr_info("Unknown token 0x%.2x: 0x%.8x.",
					token, tmp_int);
				break;
			}
			break;
		case 2:
			/* 8-bit unsigned integer */
			delay_ms = serial_timeout(serial, 1);
			if (serial_read_blocking(serial, &tmp_c, 1, delay_ms) != 1)
				break;
			sr_dbg("Got metadata key 0x%.2x value 0x%.2x.",
			       key, tmp_c);
			switch (token) {
			case 0x00:
				/* Number of usable channels */
				for (ui = 0; ui < tmp_c; ui++)
					sr_channel_new(sdi, ui, SR_CHANNEL_LOGIC, TRUE,
							ols_channel_names[ui]);
				break;
			case 0x01:
				/* protocol version */
				devc->protocol_version = tmp_c;
				break;
			default:
				sr_info("Unknown token 0x%.2x: 0x%.2x.",
					token, tmp_c);
				break;
			}
			break;
		default:
			/* unknown type */
			break;
		}
	}

	sdi->model = devname->str;
	sdi->version = version->str;
	g_string_free(devname, FALSE);
	g_string_free(version, FALSE);

	return sdi;
}

SR_PRIV int ols_set_samplerate(const struct sr_dev_inst *sdi,
		const uint64_t samplerate)
{
	struct dev_context *devc;

	devc = sdi->priv;
	if (devc->max_samplerate && samplerate > devc->max_samplerate)
		return SR_ERR_SAMPLERATE;

	if (samplerate > CLOCK_RATE) {
		sr_info("Enabling demux mode.");
		devc->flag_reg |= FLAG_DEMUX;
		devc->flag_reg &= ~FLAG_FILTER;
		devc->max_channels = NUM_CHANNELS / 2;
		devc->cur_samplerate_divider = (CLOCK_RATE * 2 / samplerate) - 1;
	} else {
		sr_info("Disabling demux mode.");
		devc->flag_reg &= ~FLAG_DEMUX;
		devc->flag_reg |= FLAG_FILTER;
		devc->max_channels = NUM_CHANNELS;
		devc->cur_samplerate_divider = (CLOCK_RATE / samplerate) - 1;
	}

	/* Calculate actual samplerate used and complain if it is different
	 * from the requested.
	 */
	devc->cur_samplerate = CLOCK_RATE / (devc->cur_samplerate_divider + 1);
	if (devc->flag_reg & FLAG_DEMUX)
		devc->cur_samplerate *= 2;
	if (devc->cur_samplerate != samplerate)
		sr_info("Can't match samplerate %" PRIu64 ", using %"
		       PRIu64 ".", samplerate, devc->cur_samplerate);

	return SR_OK;
}

SR_PRIV void abort_acquisition(const struct sr_dev_inst *sdi)
{
	struct sr_serial_dev_inst *serial;

	serial = sdi->conn;
	serial_source_remove(sdi->session, serial);

	std_session_send_df_end(sdi);
}

SR_PRIV int ols_receive_data(int fd, int revents, void *cb_data)
{
	struct dev_context *devc;
	struct sr_dev_inst *sdi;
	struct sr_serial_dev_inst *serial;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_logic logic;
	uint32_t sample;
	int num_ols_changrp, offset, j;
	unsigned int i;
	unsigned char byte;

	(void)fd;

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

	if (devc->num_transfers == 0 && revents == 0) {
		/* Ignore timeouts as long as we haven't received anything */
		return TRUE;
	}

	if (devc->num_transfers++ == 0) {
		devc->raw_sample_buf = g_try_malloc(devc->limit_samples * 4);
		if (!devc->raw_sample_buf) {
			sr_err("Sample buffer malloc failed.");
			return FALSE;
		}
		/* fill with 1010... for debugging */
		memset(devc->raw_sample_buf, 0x82, devc->limit_samples * 4);
	}

	num_ols_changrp = 0;
	for (i = 0x20; i > 0x02; i >>= 1) {
		if ((devc->flag_reg & i) == 0) {
			num_ols_changrp++;
		}
	}

	if (revents == G_IO_IN && devc->num_samples < devc->limit_samples) {
		if (serial_read_nonblocking(serial, &byte, 1) != 1)
			return FALSE;
		devc->cnt_bytes++;

		/* Ignore it if we've read enough. */
		if (devc->num_samples >= devc->limit_samples)
			return TRUE;

		devc->sample[devc->num_bytes++] = byte;
		sr_spew("Received byte 0x%.2x.", byte);
		if (devc->num_bytes == num_ols_changrp) {
			devc->cnt_samples++;
			devc->cnt_samples_rle++;
			/*
			 * Got a full sample. Convert from the OLS's little-endian
			 * sample to the local format.
			 */
			sample = devc->sample[0] | (devc->sample[1] << 8) \
					| (devc->sample[2] << 16) | (devc->sample[3] << 24);
			sr_dbg("Received sample 0x%.*x.", devc->num_bytes * 2, sample);
			if (devc->flag_reg & FLAG_RLE) {
				/*
				 * In RLE mode the high bit of the sample is the
				 * "count" flag, meaning this sample is the number
				 * of times the previous sample occurred.
				 */
				if (devc->sample[devc->num_bytes - 1] & 0x80) {
					/* Clear the high bit. */
					sample &= ~(0x80 << (devc->num_bytes - 1) * 8);
					devc->rle_count = sample;
					devc->cnt_samples_rle += devc->rle_count;
					sr_dbg("RLE count: %u.", devc->rle_count);
					devc->num_bytes = 0;
					return TRUE;
				}
			}
			devc->num_samples += devc->rle_count + 1;
			if (devc->num_samples > devc->limit_samples) {
				/* Save us from overrunning the buffer. */
				devc->rle_count -= devc->num_samples - devc->limit_samples;
				devc->num_samples = devc->limit_samples;
			}

			if (num_ols_changrp < 4) {
				/*
				 * Some channel groups may have been turned
				 * off, to speed up transfer between the
				 * hardware and the PC. Expand that here before
				 * submitting it over the session bus --
				 * whatever is listening on the bus will be
				 * expecting a full 32-bit sample, based on
				 * the number of channels.
				 */
				j = 0;
				memset(devc->tmp_sample, 0, 4);
				for (i = 0; i < 4; i++) {
					if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
						/*
						 * This channel group was
						 * enabled, copy from received
						 * sample.
						 */
						devc->tmp_sample[i] = devc->sample[j++];
					} else if (devc->flag_reg & FLAG_DEMUX && (i > 2)) {
						/* group 2 & 3 get added to 0 & 1 */
						devc->tmp_sample[i - 2] = devc->sample[j++];
					}
				}
				memcpy(devc->sample, devc->tmp_sample, 4);
				sr_spew("Expanded sample: 0x%.8x.", sample);
			}

			/*
			 * the OLS sends its sample buffer backwards.
			 * store it in reverse order here, so we can dump
			 * this on the session bus later.
			 */
			offset = (devc->limit_samples - devc->num_samples) * 4;
			for (i = 0; i <= devc->rle_count; i++) {
				memcpy(devc->raw_sample_buf + offset + (i * 4),
				       devc->sample, 4);
			}
			memset(devc->sample, 0, 4);
			devc->num_bytes = 0;
			devc->rle_count = 0;
		}
	} else {
		/*
		 * This is the main loop telling us a timeout was reached, or
		 * we've acquired all the samples we asked for -- we're done.
		 * Send the (properly-ordered) buffer to the frontend.
		 */
		sr_dbg("Received %d bytes, %d samples, %d decompressed samples.",
				devc->cnt_bytes, devc->cnt_samples,
				devc->cnt_samples_rle);
		if (devc->trigger_at != -1) {
			/*
			 * A trigger was set up, so we need to tell the frontend
			 * about it.
			 */
			if (devc->trigger_at > 0) {
				/* There are pre-trigger samples, send those first. */
				packet.type = SR_DF_LOGIC;
				packet.payload = &logic;
				logic.length = devc->trigger_at * 4;
				logic.unitsize = 4;
				logic.data = devc->raw_sample_buf +
					(devc->limit_samples - devc->num_samples) * 4;
				sr_session_send(sdi, &packet);
			}

			/* Send the trigger. */
			packet.type = SR_DF_TRIGGER;
			sr_session_send(sdi, &packet);

			/* Send post-trigger samples. */
			packet.type = SR_DF_LOGIC;
			packet.payload = &logic;
			logic.length = (devc->num_samples * 4) - (devc->trigger_at * 4);
			logic.unitsize = 4;
			logic.data = devc->raw_sample_buf + devc->trigger_at * 4 +
				(devc->limit_samples - devc->num_samples) * 4;
			sr_session_send(sdi, &packet);
		} else {
			/* no trigger was used */
			packet.type = SR_DF_LOGIC;
			packet.payload = &logic;
			logic.length = devc->num_samples * 4;
			logic.unitsize = 4;
			logic.data = devc->raw_sample_buf +
				(devc->limit_samples - devc->num_samples) * 4;
			sr_session_send(sdi, &packet);
		}
		g_free(devc->raw_sample_buf);

		serial_flush(serial);
		abort_acquisition(sdi);
	}

	return TRUE;
}
Commit	Line	Data
0aba65da	1	/*
50985c20	2	* This file is part of the libsigrok project.
0aba65da	3	*
13d8e03c	4	* Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
0aba65da UH	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
6ec6c43b	20	#include <config.h>
515ab088	21	#include "protocol.h"
0aba65da	22
0aba65da UH	23	SR_PRIV int send_shortcommand(struct sr_serial_dev_inst *serial,
	24	uint8_t command)
	25	{
	26	char buf[1];
	27
	28	sr_dbg("Sending cmd 0x%.2x.", command);
	29	buf[0] = command;
f4d3a4fb	30	if (serial_write_blocking(serial, buf, 1, serial_timeout(serial, 1)) != 1)
0aba65da UH	31	return SR_ERR;
0aba65da UH	32
bce75f94 UJ	33	if (serial_drain(serial) != 0)
	34	return SR_ERR;
	35
0aba65da UH	36	return SR_OK;
	37	}
	38
	39	SR_PRIV int send_longcommand(struct sr_serial_dev_inst *serial,
016e72f3	40	uint8_t command, uint8_t *data)
0aba65da UH	41	{
	42	char buf[5];
	43
016e72f3 BV	44	sr_dbg("Sending cmd 0x%.2x data 0x%.2x%.2x%.2x%.2x.", command,
016e72f3 BV	45	data[0], data[1], data[2], data[3]);
0aba65da	46	buf[0] = command;
016e72f3 BV	47	buf[1] = data[0];
	48	buf[2] = data[1];
	49	buf[3] = data[2];
	50	buf[4] = data[3];
f4d3a4fb	51	if (serial_write_blocking(serial, buf, 5, serial_timeout(serial, 1)) != 5)
0aba65da UH	52	return SR_ERR;
0aba65da UH	53
bce75f94 UJ	54	if (serial_drain(serial) != 0)
	55	return SR_ERR;
	56
0aba65da UH	57	return SR_OK;
	58	}
	59
244995a2 GGM	60	SR_PRIV int ols_send_reset(struct sr_serial_dev_inst *serial)
	61	{
	62	unsigned int i;
	63
	64	for (i = 0; i < 5; i++) {
	65	if (send_shortcommand(serial, CMD_RESET) != SR_OK)
	66	return SR_ERR;
	67	}
	68
	69	return SR_OK;
	70	}
	71
91fd0f72 BV	72	/* Configures the channel mask based on which channels are enabled. */
91fd0f72 BV	73	SR_PRIV void ols_channel_mask(const struct sr_dev_inst *sdi)
0aba65da UH	74	{
0aba65da UH	75	struct dev_context *devc;
91fd0f72	76	struct sr_channel *channel;
0aba65da	77	const GSList *l;
0aba65da UH	78
	79	devc = sdi->priv;
	80
ba7dd8bb	81	devc->channel_mask = 0;
91fd0f72 BV	82	for (l = sdi->channels; l; l = l->next) {
	83	channel = l->data;
	84	if (channel->enabled)
	85	devc->channel_mask \|= 1 << channel->index;
	86	}
	87	}
	88
	89	SR_PRIV int ols_convert_trigger(const struct sr_dev_inst *sdi)
	90	{
	91	struct dev_context *devc;
	92	struct sr_trigger *trigger;
	93	struct sr_trigger_stage *stage;
	94	struct sr_trigger_match *match;
	95	const GSList l, m;
	96	int i;
	97
	98	devc = sdi->priv;
	99
	100	devc->num_stages = 0;
0aba65da UH	101	for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
	102	devc->trigger_mask[i] = 0;
	103	devc->trigger_value[i] = 0;
	104	}
	105
0812c40e	106	if (!(trigger = sr_session_trigger_get(sdi->session)))
91fd0f72	107	return SR_OK;
0aba65da	108
91fd0f72 BV	109	devc->num_stages = g_slist_length(trigger->stages);
	110	if (devc->num_stages > NUM_TRIGGER_STAGES) {
	111	sr_err("This device only supports %d trigger stages.",
	112	NUM_TRIGGER_STAGES);
	113	return SR_ERR;
	114	}
b1de0407	115
91fd0f72 BV	116	for (l = trigger->stages; l; l = l->next) {
	117	stage = l->data;
	118	for (m = stage->matches; m; m = m->next) {
	119	match = m->data;
	120	if (!match->channel->enabled)
	121	/* Ignore disabled channels with a trigger. */
	122	continue;
	123	devc->trigger_mask[stage->stage] \|= 1 << match->channel->index;
	124	if (match->match == SR_TRIGGER_ONE)
	125	devc->trigger_value[stage->stage] \|= 1 << match->channel->index;
0aba65da	126	}
0aba65da UH	127	}
	128
	129	return SR_OK;
	130	}
	131
0aba65da UH	132	SR_PRIV struct dev_context *ols_dev_new(void)
	133	{
	134	struct dev_context *devc;
	135
f57d8ffe	136	devc = g_malloc0(sizeof(struct dev_context));
0aba65da	137
bf256783 BV	138	/* Device-specific settings */
	139	devc->max_samples = devc->max_samplerate = devc->protocol_version = 0;
	140
	141	/* Acquisition settings */
	142	devc->limit_samples = devc->capture_ratio = 0;
0aba65da	143	devc->trigger_at = -1;
bf256783 BV	144	devc->flag_reg = 0;
bf256783 BV	145
0aba65da UH	146	return devc;
	147	}
	148
	149	SR_PRIV struct sr_dev_inst get_metadata(struct sr_serial_dev_inst serial)
	150	{
	151	struct sr_dev_inst *sdi;
	152	struct dev_context *devc;
0aba65da UH	153	uint32_t tmp_int, ui;
0aba65da UH	154	uint8_t key, type, token;
f4d3a4fb	155	int delay_ms;
0aba65da UH	156	GString tmp_str, devname, *version;
	157	guchar tmp_c;
	158
aac29cc1	159	sdi = g_malloc0(sizeof(struct sr_dev_inst));
0af636be	160	sdi->status = SR_ST_INACTIVE;
0aba65da UH	161	devc = ols_dev_new();
	162	sdi->priv = devc;
	163
	164	devname = g_string_new("");
	165	version = g_string_new("");
	166
	167	key = 0xff;
	168	while (key) {
f4d3a4fb BV	169	delay_ms = serial_timeout(serial, 1);
f4d3a4fb BV	170	if (serial_read_blocking(serial, &key, 1, delay_ms) != 1)
0aba65da	171	break;
625763e2 BV	172	if (key == 0x00) {
	173	sr_dbg("Got metadata key 0x00, metadata ends.");
	174	break;
	175	}
0aba65da UH	176	type = key >> 5;
	177	token = key & 0x1f;
	178	switch (type) {
	179	case 0:
	180	/* NULL-terminated string */
	181	tmp_str = g_string_new("");
f4d3a4fb BV	182	delay_ms = serial_timeout(serial, 1);
f4d3a4fb BV	183	while (serial_read_blocking(serial, &tmp_c, 1, delay_ms) == 1 && tmp_c != '\0')
0aba65da UH	184	g_string_append_c(tmp_str, tmp_c);
	185	sr_dbg("Got metadata key 0x%.2x value '%s'.",
	186	key, tmp_str->str);
	187	switch (token) {
	188	case 0x01:
	189	/* Device name */
	190	devname = g_string_append(devname, tmp_str->str);
	191	break;
	192	case 0x02:
	193	/* FPGA firmware version */
	194	if (version->len)
	195	g_string_append(version, ", ");
	196	g_string_append(version, "FPGA version ");
	197	g_string_append(version, tmp_str->str);
	198	break;
	199	case 0x03:
	200	/* Ancillary version */
	201	if (version->len)
	202	g_string_append(version, ", ");
	203	g_string_append(version, "Ancillary version ");
	204	g_string_append(version, tmp_str->str);
	205	break;
	206	default:
	207	sr_info("ols: unknown token 0x%.2x: '%s'",
	208	token, tmp_str->str);
	209	break;
	210	}
	211	g_string_free(tmp_str, TRUE);
	212	break;
	213	case 1:
	214	/* 32-bit unsigned integer */
f4d3a4fb BV	215	delay_ms = serial_timeout(serial, 4);
f4d3a4fb BV	216	if (serial_read_blocking(serial, &tmp_int, 4, delay_ms) != 4)
0aba65da	217	break;
016e72f3	218	tmp_int = RB32(&tmp_int);
0aba65da UH	219	sr_dbg("Got metadata key 0x%.2x value 0x%.8x.",
	220	key, tmp_int);
	221	switch (token) {
	222	case 0x00:
ba7dd8bb	223	/* Number of usable channels */
5e23fcab ML	224	for (ui = 0; ui < tmp_int; ui++)
5e23fcab ML	225	sr_channel_new(sdi, ui, SR_CHANNEL_LOGIC, TRUE,
c368e6f3	226	ols_channel_names[ui]);
0aba65da UH	227	break;
	228	case 0x01:
	229	/* Amount of sample memory available (bytes) */
	230	devc->max_samples = tmp_int;
	231	break;
	232	case 0x02:
	233	/* Amount of dynamic memory available (bytes) */
	234	/* what is this for? */
	235	break;
	236	case 0x03:
f3f19d11	237	/* Maximum sample rate (Hz) */
0aba65da UH	238	devc->max_samplerate = tmp_int;
	239	break;
	240	case 0x04:
	241	/* protocol version */
	242	devc->protocol_version = tmp_int;
	243	break;
	244	default:
	245	sr_info("Unknown token 0x%.2x: 0x%.8x.",
	246	token, tmp_int);
	247	break;
	248	}
	249	break;
	250	case 2:
	251	/* 8-bit unsigned integer */
f4d3a4fb BV	252	delay_ms = serial_timeout(serial, 1);
f4d3a4fb BV	253	if (serial_read_blocking(serial, &tmp_c, 1, delay_ms) != 1)
0aba65da UH	254	break;
	255	sr_dbg("Got metadata key 0x%.2x value 0x%.2x.",
	256	key, tmp_c);
	257	switch (token) {
	258	case 0x00:
ba7dd8bb	259	/* Number of usable channels */
5e23fcab ML	260	for (ui = 0; ui < tmp_c; ui++)
5e23fcab ML	261	sr_channel_new(sdi, ui, SR_CHANNEL_LOGIC, TRUE,
c368e6f3	262	ols_channel_names[ui]);
0aba65da UH	263	break;
	264	case 0x01:
	265	/* protocol version */
	266	devc->protocol_version = tmp_c;
	267	break;
	268	default:
	269	sr_info("Unknown token 0x%.2x: 0x%.2x.",
	270	token, tmp_c);
	271	break;
	272	}
	273	break;
	274	default:
	275	/* unknown type */
	276	break;
	277	}
	278	}
	279
	280	sdi->model = devname->str;
	281	sdi->version = version->str;
	282	g_string_free(devname, FALSE);
	283	g_string_free(version, FALSE);
	284
	285	return sdi;
	286	}
	287
	288	SR_PRIV int ols_set_samplerate(const struct sr_dev_inst *sdi,
e46aa4f6	289	const uint64_t samplerate)
0aba65da UH	290	{
	291	struct dev_context *devc;
	292
	293	devc = sdi->priv;
e46aa4f6	294	if (devc->max_samplerate && samplerate > devc->max_samplerate)
0aba65da UH	295	return SR_ERR_SAMPLERATE;
	296
	297	if (samplerate > CLOCK_RATE) {
6ebe0039	298	sr_info("Enabling demux mode.");
0aba65da	299	devc->flag_reg \|= FLAG_DEMUX;
6ebe0039	300	devc->flag_reg &= ~FLAG_FILTER;
3f239f08	301	devc->max_channels = NUM_CHANNELS / 2;
0aba65da UH	302	devc->cur_samplerate_divider = (CLOCK_RATE * 2 / samplerate) - 1;
0aba65da UH	303	} else {
6ebe0039	304	sr_info("Disabling demux mode.");
0aba65da	305	devc->flag_reg &= ~FLAG_DEMUX;
6a53bde6	306	devc->flag_reg \|= FLAG_FILTER;
3f239f08	307	devc->max_channels = NUM_CHANNELS;
0aba65da UH	308	devc->cur_samplerate_divider = (CLOCK_RATE / samplerate) - 1;
	309	}
	310
	311	/* Calculate actual samplerate used and complain if it is different
	312	* from the requested.
	313	*/
	314	devc->cur_samplerate = CLOCK_RATE / (devc->cur_samplerate_divider + 1);
	315	if (devc->flag_reg & FLAG_DEMUX)
	316	devc->cur_samplerate *= 2;
	317	if (devc->cur_samplerate != samplerate)
e46aa4f6	318	sr_info("Can't match samplerate %" PRIu64 ", using %"
0aba65da UH	319	PRIu64 ".", samplerate, devc->cur_samplerate);
	320
	321	return SR_OK;
	322	}
	323
	324	SR_PRIV void abort_acquisition(const struct sr_dev_inst *sdi)
	325	{
459a0f26	326	struct sr_serial_dev_inst *serial;
0aba65da	327
459a0f26	328	serial = sdi->conn;
102f1239	329	serial_source_remove(sdi->session, serial);
0aba65da	330
bee2b016	331	std_session_send_df_end(sdi);
0aba65da UH	332	}
	333
	334	SR_PRIV int ols_receive_data(int fd, int revents, void *cb_data)
	335	{
459a0f26	336	struct dev_context *devc;
625763e2	337	struct sr_dev_inst *sdi;
459a0f26	338	struct sr_serial_dev_inst *serial;
0aba65da UH	339	struct sr_datafeed_packet packet;
0aba65da UH	340	struct sr_datafeed_logic logic;
fe9ac252	341	uint32_t sample;
91fd0f72	342	int num_ols_changrp, offset, j;
b1de0407	343	unsigned int i;
0aba65da	344	unsigned char byte;
625763e2 BV	345
	346	(void)fd;
	347
	348	sdi = cb_data;
	349	serial = sdi->conn;
	350	devc = sdi->priv;
0aba65da	351
8105e829 DE	352	if (devc->num_transfers == 0 && revents == 0) {
	353	/* Ignore timeouts as long as we haven't received anything */
	354	return TRUE;
	355	}
	356
0aba65da	357	if (devc->num_transfers++ == 0) {
0aba65da UH	358	devc->raw_sample_buf = g_try_malloc(devc->limit_samples * 4);
	359	if (!devc->raw_sample_buf) {
	360	sr_err("Sample buffer malloc failed.");
	361	return FALSE;
	362	}
	363	/* fill with 1010... for debugging */
	364	memset(devc->raw_sample_buf, 0x82, devc->limit_samples * 4);
	365	}
	366
91fd0f72	367	num_ols_changrp = 0;
be15c51e	368	for (i = 0x20; i > 0x02; i >>= 1) {
f51acd69	369	if ((devc->flag_reg & i) == 0) {
91fd0f72	370	num_ols_changrp++;
f51acd69	371	}
0aba65da UH	372	}
0aba65da UH	373
faf72024	374	if (revents == G_IO_IN && devc->num_samples < devc->limit_samples) {
9f5d4c3c	375	if (serial_read_nonblocking(serial, &byte, 1) != 1)
0aba65da	376	return FALSE;
625763e2	377	devc->cnt_bytes++;
0aba65da UH	378
	379	/* Ignore it if we've read enough. */
	380	if (devc->num_samples >= devc->limit_samples)
	381	return TRUE;
	382
	383	devc->sample[devc->num_bytes++] = byte;
6d16fdfb	384	sr_spew("Received byte 0x%.2x.", byte);
91fd0f72	385	if (devc->num_bytes == num_ols_changrp) {
625763e2 BV	386	devc->cnt_samples++;
	387	devc->cnt_samples_rle++;
	388	/*
	389	* Got a full sample. Convert from the OLS's little-endian
	390	* sample to the local format.
	391	*/
fe9ac252 BV	392	sample = devc->sample[0] \| (devc->sample[1] << 8) \
fe9ac252 BV	393	\| (devc->sample[2] << 16) \| (devc->sample[3] << 24);
625763e2	394	sr_dbg("Received sample 0x%.x.", devc->num_bytes 2, sample);
0aba65da UH	395	if (devc->flag_reg & FLAG_RLE) {
0aba65da UH	396	/*
00d04d3b BV	397	* In RLE mode the high bit of the sample is the
	398	* "count" flag, meaning this sample is the number
	399	* of times the previous sample occurred.
0aba65da UH	400	*/
0aba65da UH	401	if (devc->sample[devc->num_bytes - 1] & 0x80) {
00d04d3b BV	402	/* Clear the high bit. */
00d04d3b BV	403	sample &= ~(0x80 << (devc->num_bytes - 1) * 8);
fe9ac252	404	devc->rle_count = sample;
625763e2	405	devc->cnt_samples_rle += devc->rle_count;
00d04d3b	406	sr_dbg("RLE count: %u.", devc->rle_count);
0aba65da UH	407	devc->num_bytes = 0;
	408	return TRUE;
	409	}
	410	}
	411	devc->num_samples += devc->rle_count + 1;
	412	if (devc->num_samples > devc->limit_samples) {
	413	/* Save us from overrunning the buffer. */
	414	devc->rle_count -= devc->num_samples - devc->limit_samples;
	415	devc->num_samples = devc->limit_samples;
	416	}
	417
91fd0f72	418	if (num_ols_changrp < 4) {
0aba65da UH	419	/*
	420	* Some channel groups may have been turned
	421	* off, to speed up transfer between the
	422	* hardware and the PC. Expand that here before
	423	* submitting it over the session bus --
	424	* whatever is listening on the bus will be
	425	* expecting a full 32-bit sample, based on
ba7dd8bb	426	* the number of channels.
0aba65da UH	427	*/
	428	j = 0;
	429	memset(devc->tmp_sample, 0, 4);
	430	for (i = 0; i < 4; i++) {
	431	if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
	432	/*
	433	* This channel group was
	434	* enabled, copy from received
	435	* sample.
	436	*/
	437	devc->tmp_sample[i] = devc->sample[j++];
f51acd69	438	} else if (devc->flag_reg & FLAG_DEMUX && (i > 2)) {
b1de0407	439	/* group 2 & 3 get added to 0 & 1 */
f51acd69	440	devc->tmp_sample[i - 2] = devc->sample[j++];
0aba65da UH	441	}
	442	}
	443	memcpy(devc->sample, devc->tmp_sample, 4);
625763e2	444	sr_spew("Expanded sample: 0x%.8x.", sample);
0aba65da UH	445	}
0aba65da UH	446
625763e2 BV	447	/*
625763e2 BV	448	* the OLS sends its sample buffer backwards.
0aba65da UH	449	* store it in reverse order here, so we can dump
	450	* this on the session bus later.
	451	*/
	452	offset = (devc->limit_samples - devc->num_samples) * 4;
	453	for (i = 0; i <= devc->rle_count; i++) {
	454	memcpy(devc->raw_sample_buf + offset + (i * 4),
	455	devc->sample, 4);
	456	}
	457	memset(devc->sample, 0, 4);
	458	devc->num_bytes = 0;
	459	devc->rle_count = 0;
	460	}
	461	} else {
	462	/*
	463	* This is the main loop telling us a timeout was reached, or
	464	* we've acquired all the samples we asked for -- we're done.
	465	* Send the (properly-ordered) buffer to the frontend.
	466	*/
625763e2 BV	467	sr_dbg("Received %d bytes, %d samples, %d decompressed samples.",
	468	devc->cnt_bytes, devc->cnt_samples,
	469	devc->cnt_samples_rle);
0aba65da	470	if (devc->trigger_at != -1) {
625763e2 BV	471	/*
625763e2 BV	472	* A trigger was set up, so we need to tell the frontend
0aba65da UH	473	* about it.
	474	*/
	475	if (devc->trigger_at > 0) {
625763e2	476	/* There are pre-trigger samples, send those first. */
0aba65da UH	477	packet.type = SR_DF_LOGIC;
	478	packet.payload = &logic;
	479	logic.length = devc->trigger_at * 4;
	480	logic.unitsize = 4;
	481	logic.data = devc->raw_sample_buf +
	482	(devc->limit_samples - devc->num_samples) * 4;
695dc859	483	sr_session_send(sdi, &packet);
0aba65da UH	484	}
0aba65da UH	485
625763e2	486	/* Send the trigger. */
0aba65da	487	packet.type = SR_DF_TRIGGER;
695dc859	488	sr_session_send(sdi, &packet);
0aba65da	489
625763e2	490	/* Send post-trigger samples. */
0aba65da UH	491	packet.type = SR_DF_LOGIC;
	492	packet.payload = &logic;
	493	logic.length = (devc->num_samples * 4) - (devc->trigger_at * 4);
	494	logic.unitsize = 4;
	495	logic.data = devc->raw_sample_buf + devc->trigger_at * 4 +
	496	(devc->limit_samples - devc->num_samples) * 4;
695dc859	497	sr_session_send(sdi, &packet);
0aba65da UH	498	} else {
	499	/* no trigger was used */
	500	packet.type = SR_DF_LOGIC;
	501	packet.payload = &logic;
	502	logic.length = devc->num_samples * 4;
	503	logic.unitsize = 4;
	504	logic.data = devc->raw_sample_buf +
	505	(devc->limit_samples - devc->num_samples) * 4;
695dc859	506	sr_session_send(sdi, &packet);
0aba65da UH	507	}
	508	g_free(devc->raw_sample_buf);
	509
459a0f26	510	serial_flush(serial);
0aba65da	511	abort_acquisition(sdi);
0aba65da UH	512	}
	513
	514	return TRUE;
	515	}