[libsigrok.git] / src / hardware / pipistrello-ols / 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"

extern SR_PRIV struct sr_dev_driver p_ols_driver_info;

SR_PRIV int write_shortcommand(struct dev_context *devc, uint8_t command)
{
	uint8_t buf[1];
	int bytes_written;

	sr_dbg("Sending cmd 0x%.2x.", command);
	buf[0] = command;
	bytes_written = ftdi_write_data(devc->ftdic, buf, 1);
	if (bytes_written < 0) {
		sr_err("Failed to write FTDI data (%d): %s.",
		       bytes_written, ftdi_get_error_string(devc->ftdic));
		return SR_ERR;
	} else if (bytes_written != 1) {
		sr_err("FTDI write error, only %d/%d bytes written: %s.",
		       bytes_written, 1, ftdi_get_error_string(devc->ftdic));
		return SR_ERR;
	}

	return SR_OK;
}

SR_PRIV int write_longcommand(struct dev_context *devc, uint8_t command, uint8_t *data)
{
	uint8_t buf[5];
	int bytes_written;

	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];
	bytes_written = ftdi_write_data(devc->ftdic, buf, 5);
	if (bytes_written < 0) {
		sr_err("Failed to write FTDI data (%d): %s.",
		       bytes_written, ftdi_get_error_string(devc->ftdic));
		return SR_ERR;
	} else if (bytes_written != 5) {
		sr_err("FTDI write error, only %d/%d bytes written: %s.",
		       bytes_written, 1, ftdi_get_error_string(devc->ftdic));
		return SR_ERR;
	}

	return SR_OK;
}

SR_PRIV int p_ols_open(struct dev_context *devc)
{
	int ret;

	/* Note: Caller checks devc and devc->ftdic. */

	/* Select interface B, otherwise communication will fail. */
	ret = ftdi_set_interface(devc->ftdic, INTERFACE_B);
	if (ret < 0) {
		sr_err("Failed to set FTDI interface B (%d): %s", ret,
		       ftdi_get_error_string(devc->ftdic));
		return SR_ERR;
	}
	sr_dbg("FTDI chip interface B set successfully.");

	/* Check for the device and temporarily open it. */
	ret = ftdi_usb_open_desc(devc->ftdic, USB_VENDOR_ID, USB_DEVICE_ID,
				 USB_IPRODUCT, NULL);
	if (ret < 0) {
		/* Log errors, except for -3 ("device not found"). */
		if (ret != -3)
			sr_err("Failed to open device (%d): %s", ret,
			       ftdi_get_error_string(devc->ftdic));
		return SR_ERR;
	}
	sr_dbg("FTDI device opened successfully.");

	/* Purge RX/TX buffers in the FTDI chip. */
	if ((ret = ftdi_usb_purge_buffers(devc->ftdic)) < 0) {
		sr_err("Failed to purge FTDI RX/TX buffers (%d): %s.",
		       ret, ftdi_get_error_string(devc->ftdic));
		goto err_open_close_ftdic;
	}
	sr_dbg("FTDI chip buffers purged successfully.");

	/* Reset the FTDI bitmode. */
	ret = ftdi_set_bitmode(devc->ftdic, 0xff, BITMODE_RESET);
	if (ret < 0) {
		sr_err("Failed to reset the FTDI chip bitmode (%d): %s.",
		       ret, ftdi_get_error_string(devc->ftdic));
		goto err_open_close_ftdic;
	}
	sr_dbg("FTDI chip bitmode reset successfully.");

	/* Set the FTDI latency timer to 16. */
	ret = ftdi_set_latency_timer(devc->ftdic, 16);
	if (ret < 0) {
		sr_err("Failed to set FTDI latency timer (%d): %s.",
		       ret, ftdi_get_error_string(devc->ftdic));
		goto err_open_close_ftdic;
	}
	sr_dbg("FTDI chip latency timer set successfully.");

	/* Set the FTDI read data chunk size to 64kB. */
	ret = ftdi_read_data_set_chunksize(devc->ftdic, 64 * 1024);
	if (ret < 0) {
		sr_err("Failed to set FTDI read data chunk size (%d): %s.",
		       ret, ftdi_get_error_string(devc->ftdic));
		goto err_open_close_ftdic;
	}
	sr_dbg("FTDI chip read data chunk size set successfully.");
	
	return SR_OK;

err_open_close_ftdic:
	ftdi_usb_close(devc->ftdic);
	return SR_ERR;
}

SR_PRIV int p_ols_close(struct dev_context *devc)
{
	int ret;

	/* Note: Caller checks devc and devc->ftdic. */

	if ((ret = ftdi_usb_close(devc->ftdic)) < 0) {
		sr_err("Failed to close FTDI device (%d): %s.",
		       ret, ftdi_get_error_string(devc->ftdic));
		return SR_ERR;
	}

	return SR_OK;
}

/* Configures the channel mask based on which channels are enabled. */
SR_PRIV void pols_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 pols_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;
		devc->trigger_edge[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 || match->match == SR_TRIGGER_RISING)
				devc->trigger_value[stage->stage] |= 1 << match->channel->index;
			if (match->match == SR_TRIGGER_RISING || match->match == SR_TRIGGER_FALLING)
				devc->trigger_edge[stage->stage] |= 1 << match->channel->index;
		}
	}

	return SR_OK;
}

SR_PRIV struct sr_dev_inst *p_ols_get_metadata(uint8_t *buf, int bytes_read, struct dev_context *devc)
{
	struct sr_dev_inst *sdi;
	uint32_t tmp_int, ui;
	uint8_t key, type, token;
	GString *tmp_str, *devname, *version;
	guchar tmp_c;
	int index, i;

	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	sdi->status = SR_ST_INACTIVE;
	sdi->driver = &p_ols_driver_info;
	sdi->priv = devc;

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

	index = 0;
	while (index < bytes_read) {
		key = buf[index++];
		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("");
			while ((index < bytes_read) && ((tmp_c = buf[index++]) != '\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("Unknown token 0x%.2x: '%s'",
					token, tmp_str->str);
				break;
			}
			g_string_free(tmp_str, TRUE);
			break;
		case 1:
			/* 32-bit unsigned integer */
			tmp_int = 0;
			for (i = 0; i < 4; i++) {
				tmp_int = (tmp_int << 8) | buf[index++];
			}
			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,
							p_ols_channel_names[ui]);
				break;
			case 0x01:
				/* Amount of sample memory available (bytes) */
				devc->max_samplebytes = 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 */
			tmp_c = buf[index++];
			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,
							p_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 p_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 int p_ols_receive_data(int fd, int revents, void *cb_data)
{
	struct dev_context *devc;
	struct sr_dev_inst *sdi;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_logic logic;
	uint32_t sample;
	int num_channels, offset, j;
	int bytes_read, index;
	unsigned int i;
	unsigned char byte;

	(void)fd;
	(void)revents;

	sdi = cb_data;
	devc = sdi->priv;

	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);
	}

	if ((devc->num_samples < devc->limit_samples) && (devc->cnt_samples < devc->max_samples)) {

		num_channels = 0;
		for (i = NUM_CHANNELS; i > 0x02; i /= 2) {
			if ((devc->flag_reg & i) == 0) {
				num_channels++;
			}
		}

		/* Get a block of data. */
		bytes_read = ftdi_read_data(devc->ftdic, devc->ftdi_buf, FTDI_BUF_SIZE);
		if (bytes_read < 0) {
			sr_err("Failed to read FTDI data (%d): %s.",
			       bytes_read, ftdi_get_error_string(devc->ftdic));
			sdi->driver->dev_acquisition_stop(sdi, sdi);
			return FALSE;
		}
		if (bytes_read == 0) {
			sr_spew("Received 0 bytes, nothing to do.");
			return TRUE;
		}

		sr_dbg("Received %d bytes", bytes_read);

		index = 0;
		while (index < bytes_read) {
			byte = devc->ftdi_buf[index++];
			devc->cnt_bytes++;

			devc->sample[devc->num_bytes++] = byte;
			sr_spew("Received byte 0x%.2x.", byte);

			if ((devc->flag_reg & FLAG_DEMUX) && (devc->flag_reg & FLAG_RLE)) {
				/* RLE in demux mode must be processed differently 
				* since in this case the RLE encoder is operating on pairs of samples.
				*/
				if (devc->num_bytes == num_channels * 2) {
					devc->cnt_samples += 2;
					devc->cnt_samples_rle += 2;
					/*
					 * Got a sample pair. 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_spew("Received sample pair 0x%.*x.", devc->num_bytes * 2, sample);

					/*
					 * In RLE mode the high bit of the sample pair is the
					 * "count" flag, meaning this sample pair is the number
					 * of times the previous sample pair 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 * 2;
						sr_dbg("RLE count: %u.", devc->rle_count * 2);
						devc->num_bytes = 0;
						continue;
					}
					devc->num_samples += (devc->rle_count + 1) * 2;
					if (devc->num_samples > devc->limit_samples) {
						/* Save us from overrunning the buffer. */
						devc->rle_count -= (devc->num_samples - devc->limit_samples) / 2;
						devc->num_samples = devc->limit_samples;
						index = bytes_read;
					}

					/*
					 * 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;
					/* expand first sample */
					memset(devc->tmp_sample, 0, 4);
					for (i = 0; i < 2; 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++];
						} 
					}
					/* Clear out the most significant bit of the sample */
					devc->tmp_sample[devc->num_bytes - 1] &= 0x7f;
					sr_spew("Expanded sample 1: 0x%.2x%.2x%.2x%.2x.",
						devc->tmp_sample[3], devc->tmp_sample[2],
						devc->tmp_sample[1], devc->tmp_sample[0]);

					/* expand second sample */
					memset(devc->tmp_sample2, 0, 4);
					for (i = 0; i < 2; i++) {
						if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
							/*
							 * This channel group was
							 * enabled, copy from received
							 * sample.
							 */
							devc->tmp_sample2[i] = devc->sample[j++];
						} 
					}
					/* Clear out the most significant bit of the sample */
					devc->tmp_sample2[devc->num_bytes - 1] &= 0x7f;
					sr_spew("Expanded sample 2: 0x%.2x%.2x%.2x%.2x.",
						devc->tmp_sample2[3], devc->tmp_sample2[2],
						devc->tmp_sample2[1], devc->tmp_sample2[0]);

					/*
					 * 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 * 8),
									 devc->tmp_sample2, 4);
						memcpy(devc->raw_sample_buf + offset + (4 + (i * 8)),
									 devc->tmp_sample, 4);
					}
					memset(devc->sample, 0, 4);
					devc->num_bytes = 0;
					devc->rle_count = 0;
				}
			}
			else {
				if (devc->num_bytes == num_channels) {
					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_spew("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;
							continue;
						}
					}
					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;
						index = bytes_read;
					}

					if (num_channels < 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++];
							} 
						}
						memcpy(devc->sample, devc->tmp_sample, 4);
						sr_spew("Expanded sample: 0x%.8x.", sample);
					}

					/*
					 * Pipistrello 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;
				}
			}
		}
		return TRUE;
	} else {
		do {
			bytes_read = ftdi_read_data(devc->ftdic, devc->ftdi_buf, FTDI_BUF_SIZE);
		} while (bytes_read > 0);

		/*
		 * 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(cb_data, &packet);
			}

			/* Send the trigger. */
			packet.type = SR_DF_TRIGGER;
			sr_session_send(cb_data, &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(cb_data, &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(cb_data, &packet);
		}
		g_free(devc->raw_sample_buf);

		sdi->driver->dev_acquisition_stop(sdi, cb_data);
	}

	return TRUE;
}
Commit	Line	Data
4bd80e12	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
6ec6c43b	20	#include <config.h>
4bd80e12	21	#include "protocol.h"
	22
	23	extern SR_PRIV struct sr_dev_driver p_ols_driver_info;
4bd80e12	24
	25	SR_PRIV int write_shortcommand(struct dev_context *devc, uint8_t command)
	26	{
	27	uint8_t buf[1];
	28	int bytes_written;
	29
	30	sr_dbg("Sending cmd 0x%.2x.", command);
	31	buf[0] = command;
	32	bytes_written = ftdi_write_data(devc->ftdic, buf, 1);
	33	if (bytes_written < 0) {
	34	sr_err("Failed to write FTDI data (%d): %s.",
	35	bytes_written, ftdi_get_error_string(devc->ftdic));
	36	return SR_ERR;
	37	} else if (bytes_written != 1) {
	38	sr_err("FTDI write error, only %d/%d bytes written: %s.",
	39	bytes_written, 1, ftdi_get_error_string(devc->ftdic));
	40	return SR_ERR;
	41	}
	42
	43	return SR_OK;
	44	}
	45
	46	SR_PRIV int write_longcommand(struct dev_context devc, uint8_t command, uint8_t data)
	47	{
	48	uint8_t buf[5];
	49	int bytes_written;
	50
	51	sr_dbg("Sending cmd 0x%.2x data 0x%.2x%.2x%.2x%.2x.", command,
	52	data[0], data[1], data[2], data[3]);
	53	buf[0] = command;
	54	buf[1] = data[0];
	55	buf[2] = data[1];
	56	buf[3] = data[2];
	57	buf[4] = data[3];
	58	bytes_written = ftdi_write_data(devc->ftdic, buf, 5);
	59	if (bytes_written < 0) {
	60	sr_err("Failed to write FTDI data (%d): %s.",
	61	bytes_written, ftdi_get_error_string(devc->ftdic));
	62	return SR_ERR;
	63	} else if (bytes_written != 5) {
	64	sr_err("FTDI write error, only %d/%d bytes written: %s.",
	65	bytes_written, 1, ftdi_get_error_string(devc->ftdic));
	66	return SR_ERR;
	67	}
	68
	69	return SR_OK;
	70	}
	71
	72	SR_PRIV int p_ols_open(struct dev_context *devc)
	73	{
	74	int ret;
	75
	76	/* Note: Caller checks devc and devc->ftdic. */
	77
	78	/* Select interface B, otherwise communication will fail. */
	79	ret = ftdi_set_interface(devc->ftdic, INTERFACE_B);
	80	if (ret < 0) {
	81	sr_err("Failed to set FTDI interface B (%d): %s", ret,
	82	ftdi_get_error_string(devc->ftdic));
	83	return SR_ERR;
	84	}
	85	sr_dbg("FTDI chip interface B set successfully.");
	86
	87	/* Check for the device and temporarily open it. */
88	ret = ftdi_usb_open_desc(devc->ftdic, USB_VENDOR_ID, USB_DEVICE_ID,
89	USB_IPRODUCT, NULL);
90	if (ret < 0) {
91	/* Log errors, except for -3 ("device not found"). */
92	if (ret != -3)
93	sr_err("Failed to open device (%d): %s", ret,
94	ftdi_get_error_string(devc->ftdic));
95	return SR_ERR;
96	}
97	sr_dbg("FTDI device opened successfully.");
98
99	/* Purge RX/TX buffers in the FTDI chip. */
100	if ((ret = ftdi_usb_purge_buffers(devc->ftdic)) < 0) {
101	sr_err("Failed to purge FTDI RX/TX buffers (%d): %s.",
102	ret, ftdi_get_error_string(devc->ftdic));
103	goto err_open_close_ftdic;
104	}
105	sr_dbg("FTDI chip buffers purged successfully.");
106
107	/* Reset the FTDI bitmode. */
108	ret = ftdi_set_bitmode(devc->ftdic, 0xff, BITMODE_RESET);
109	if (ret < 0) {
110	sr_err("Failed to reset the FTDI chip bitmode (%d): %s.",
111	ret, ftdi_get_error_string(devc->ftdic));
112	goto err_open_close_ftdic;
113	}
114	sr_dbg("FTDI chip bitmode reset successfully.");
115
116	/* Set the FTDI latency timer to 16. */
117	ret = ftdi_set_latency_timer(devc->ftdic, 16);
118	if (ret < 0) {
119	sr_err("Failed to set FTDI latency timer (%d): %s.",
120	ret, ftdi_get_error_string(devc->ftdic));
121	goto err_open_close_ftdic;
122	}
123	sr_dbg("FTDI chip latency timer set successfully.");
124
125	/* Set the FTDI read data chunk size to 64kB. */
126	ret = ftdi_read_data_set_chunksize(devc->ftdic, 64 * 1024);
127	if (ret < 0) {
128	sr_err("Failed to set FTDI read data chunk size (%d): %s.",
129	ret, ftdi_get_error_string(devc->ftdic));
130	goto err_open_close_ftdic;
131	}
132	sr_dbg("FTDI chip read data chunk size set successfully.");
133
134	return SR_OK;
135
136	err_open_close_ftdic:
1f9bcd0f	137	ftdi_usb_close(devc->ftdic);
4bd80e12	138	return SR_ERR;
	139	}
	140
	141	SR_PRIV int p_ols_close(struct dev_context *devc)
	142	{
	143	int ret;
	144
	145	/* Note: Caller checks devc and devc->ftdic. */
	146
	147	if ((ret = ftdi_usb_close(devc->ftdic)) < 0) {
	148	sr_err("Failed to close FTDI device (%d): %s.",
	149	ret, ftdi_get_error_string(devc->ftdic));
	150	return SR_ERR;
	151	}
	152
	153	return SR_OK;
	154	}
	155
acc885c7 BV	156	/* Configures the channel mask based on which channels are enabled. */
acc885c7 BV	157	SR_PRIV void pols_channel_mask(const struct sr_dev_inst *sdi)
4bd80e12	158	{
4bd80e12	159	struct dev_context *devc;
acc885c7	160	struct sr_channel *channel;
4bd80e12	161	const GSList *l;
4bd80e12	162
	163	devc = sdi->priv;
	164
	165	devc->channel_mask = 0;
acc885c7 BV	166	for (l = sdi->channels; l; l = l->next) {
	167	channel = l->data;
	168	if (channel->enabled)
	169	devc->channel_mask \|= 1 << channel->index;
	170	}
	171	}
	172
	173	SR_PRIV int pols_convert_trigger(const struct sr_dev_inst *sdi)
	174	{
	175	struct dev_context *devc;
	176	struct sr_trigger *trigger;
	177	struct sr_trigger_stage *stage;
	178	struct sr_trigger_match *match;
	179	const GSList l, m;
	180	int i;
	181
	182	devc = sdi->priv;
	183
	184	devc->num_stages = 0;
4bd80e12	185	for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
	186	devc->trigger_mask[i] = 0;
	187	devc->trigger_value[i] = 0;
1e0de846	188	devc->trigger_edge[i] = 0;
4bd80e12	189	}
4bd80e12	190
acc885c7 BV	191	if (!(trigger = sr_session_trigger_get(sdi->session)))
acc885c7 BV	192	return SR_OK;
4bd80e12	193
acc885c7 BV	194	devc->num_stages = g_slist_length(trigger->stages);
	195	if (devc->num_stages > NUM_TRIGGER_STAGES) {
	196	sr_err("This device only supports %d trigger stages.",
	197	NUM_TRIGGER_STAGES);
	198	return SR_ERR;
	199	}
4bd80e12	200
acc885c7 BV	201	for (l = trigger->stages; l; l = l->next) {
	202	stage = l->data;
	203	for (m = stage->matches; m; m = m->next) {
	204	match = m->data;
	205	if (!match->channel->enabled)
	206	/* Ignore disabled channels with a trigger. */
	207	continue;
	208	devc->trigger_mask[stage->stage] \|= 1 << match->channel->index;
	209	if (match->match == SR_TRIGGER_ONE \|\| match->match == SR_TRIGGER_RISING)
	210	devc->trigger_value[stage->stage] \|= 1 << match->channel->index;
	211	if (match->match == SR_TRIGGER_RISING \|\| match->match == SR_TRIGGER_FALLING)
	212	devc->trigger_edge[stage->stage] \|= 1 << match->channel->index;
4bd80e12	213	}
4bd80e12	214	}
	215
	216	return SR_OK;
	217	}
	218
	219	SR_PRIV struct sr_dev_inst p_ols_get_metadata(uint8_t buf, int bytes_read, struct dev_context *devc)
	220	{
	221	struct sr_dev_inst *sdi;
4bd80e12	222	uint32_t tmp_int, ui;
	223	uint8_t key, type, token;
	224	GString tmp_str, devname, *version;
	225	guchar tmp_c;
	226	int index, i;
	227
aac29cc1	228	sdi = g_malloc0(sizeof(struct sr_dev_inst));
0af636be	229	sdi->status = SR_ST_INACTIVE;
4f840ce9	230	sdi->driver = &p_ols_driver_info;
4bd80e12	231	sdi->priv = devc;
	232
	233	devname = g_string_new("");
	234	version = g_string_new("");
	235
	236	index = 0;
	237	while (index < bytes_read) {
	238	key = buf[index++];
	239	if (key == 0x00) {
	240	sr_dbg("Got metadata key 0x00, metadata ends.");
	241	break;
	242	}
	243	type = key >> 5;
	244	token = key & 0x1f;
	245	switch (type) {
	246	case 0:
	247	/* NULL-terminated string */
	248	tmp_str = g_string_new("");
	249	while ((index < bytes_read) && ((tmp_c = buf[index++]) != '\0'))
	250	g_string_append_c(tmp_str, tmp_c);
	251	sr_dbg("Got metadata key 0x%.2x value '%s'.",
	252	key, tmp_str->str);
	253	switch (token) {
	254	case 0x01:
	255	/* Device name */
	256	devname = g_string_append(devname, tmp_str->str);
	257	break;
	258	case 0x02:
	259	/* FPGA firmware version */
	260	if (version->len)
	261	g_string_append(version, ", ");
	262	g_string_append(version, "FPGA version ");
	263	g_string_append(version, tmp_str->str);
	264	break;
	265	case 0x03:
	266	/* Ancillary version */
	267	if (version->len)
	268	g_string_append(version, ", ");
	269	g_string_append(version, "Ancillary version ");
	270	g_string_append(version, tmp_str->str);
	271	break;
	272	default:
	273	sr_info("Unknown token 0x%.2x: '%s'",
	274	token, tmp_str->str);
	275	break;
	276	}
	277	g_string_free(tmp_str, TRUE);
	278	break;
	279	case 1:
	280	/* 32-bit unsigned integer */
	281	tmp_int = 0;
	282	for (i = 0; i < 4; i++) {
	283	tmp_int = (tmp_int << 8) \| buf[index++];
	284	}
	285	sr_dbg("Got metadata key 0x%.2x value 0x%.8x.",
	286	key, tmp_int);
	287	switch (token) {
	288	case 0x00:
	289	/* Number of usable channels */
5e23fcab ML	290	for (ui = 0; ui < tmp_int; ui++)
5e23fcab ML	291	sr_channel_new(sdi, ui, SR_CHANNEL_LOGIC, TRUE,
c368e6f3	292	p_ols_channel_names[ui]);
4bd80e12	293	break;
	294	case 0x01:
	295	/* Amount of sample memory available (bytes) */
b94cff40	296	devc->max_samplebytes = tmp_int;
4bd80e12	297	break;
	298	case 0x02:
	299	/* Amount of dynamic memory available (bytes) */
	300	/* what is this for? */
	301	break;
	302	case 0x03:
f3f19d11	303	/* Maximum sample rate (Hz) */
4bd80e12	304	devc->max_samplerate = tmp_int;
	305	break;
	306	case 0x04:
	307	/* protocol version */
	308	devc->protocol_version = tmp_int;
	309	break;
	310	default:
	311	sr_info("Unknown token 0x%.2x: 0x%.8x.",
	312	token, tmp_int);
	313	break;
	314	}
	315	break;
	316	case 2:
	317	/* 8-bit unsigned integer */
	318	tmp_c = buf[index++];
	319	sr_dbg("Got metadata key 0x%.2x value 0x%.2x.",
	320	key, tmp_c);
	321	switch (token) {
	322	case 0x00:
	323	/* Number of usable channels */
5e23fcab ML	324	for (ui = 0; ui < tmp_c; ui++)
5e23fcab ML	325	sr_channel_new(sdi, ui, SR_CHANNEL_LOGIC, TRUE,
c368e6f3	326	p_ols_channel_names[ui]);
4bd80e12	327	break;
	328	case 0x01:
	329	/* protocol version */
	330	devc->protocol_version = tmp_c;
	331	break;
	332	default:
	333	sr_info("Unknown token 0x%.2x: 0x%.2x.",
	334	token, tmp_c);
	335	break;
	336	}
	337	break;
	338	default:
	339	/* unknown type */
	340	break;
	341	}
	342	}
	343
	344	sdi->model = devname->str;
	345	sdi->version = version->str;
	346	g_string_free(devname, FALSE);
	347	g_string_free(version, FALSE);
	348
	349	return sdi;
	350	}
	351
	352	SR_PRIV int p_ols_set_samplerate(const struct sr_dev_inst *sdi,
	353	const uint64_t samplerate)
	354	{
	355	struct dev_context *devc;
	356
	357	devc = sdi->priv;
	358	if (devc->max_samplerate && samplerate > devc->max_samplerate)
	359	return SR_ERR_SAMPLERATE;
	360
	361	if (samplerate > CLOCK_RATE) {
	362	sr_info("Enabling demux mode.");
	363	devc->flag_reg \|= FLAG_DEMUX;
	364	devc->flag_reg &= ~FLAG_FILTER;
	365	devc->max_channels = NUM_CHANNELS / 2;
	366	devc->cur_samplerate_divider = (CLOCK_RATE * 2 / samplerate) - 1;
	367	} else {
	368	sr_info("Disabling demux mode.");
	369	devc->flag_reg &= ~FLAG_DEMUX;
	370	devc->flag_reg \|= FLAG_FILTER;
	371	devc->max_channels = NUM_CHANNELS;
	372	devc->cur_samplerate_divider = (CLOCK_RATE / samplerate) - 1;
	373	}
	374
	375	/* Calculate actual samplerate used and complain if it is different
	376	* from the requested.
	377	*/
	378	devc->cur_samplerate = CLOCK_RATE / (devc->cur_samplerate_divider + 1);
	379	if (devc->flag_reg & FLAG_DEMUX)
	380	devc->cur_samplerate *= 2;
	381	if (devc->cur_samplerate != samplerate)
	382	sr_info("Can't match samplerate %" PRIu64 ", using %"
	383	PRIu64 ".", samplerate, devc->cur_samplerate);
	384
	385	return SR_OK;
	386	}
	387
4bd80e12	388	SR_PRIV int p_ols_receive_data(int fd, int revents, void *cb_data)
	389	{
	390	struct dev_context *devc;
	391	struct sr_dev_inst *sdi;
	392	struct sr_datafeed_packet packet;
	393	struct sr_datafeed_logic logic;
	394	uint32_t sample;
	395	int num_channels, offset, j;
	396	int bytes_read, index;
	397	unsigned int i;
	398	unsigned char byte;
	399
	400	(void)fd;
	401	(void)revents;
	402
	403	sdi = cb_data;
	404	devc = sdi->priv;
	405
	406	if (devc->num_transfers++ == 0) {
	407	devc->raw_sample_buf = g_try_malloc(devc->limit_samples * 4);
	408	if (!devc->raw_sample_buf) {
	409	sr_err("Sample buffer malloc failed.");
	410	return FALSE;
	411	}
	412	/* fill with 1010... for debugging */
	413	memset(devc->raw_sample_buf, 0x82, devc->limit_samples * 4);
	414	}
	415
b94cff40	416	if ((devc->num_samples < devc->limit_samples) && (devc->cnt_samples < devc->max_samples)) {
4bd80e12	417
	418	num_channels = 0;
	419	for (i = NUM_CHANNELS; i > 0x02; i /= 2) {
	420	if ((devc->flag_reg & i) == 0) {
	421	num_channels++;
	422	}
	423	}
	424
	425	/* Get a block of data. */
	426	bytes_read = ftdi_read_data(devc->ftdic, devc->ftdi_buf, FTDI_BUF_SIZE);
	427	if (bytes_read < 0) {
	428	sr_err("Failed to read FTDI data (%d): %s.",
	429	bytes_read, ftdi_get_error_string(devc->ftdic));
	430	sdi->driver->dev_acquisition_stop(sdi, sdi);
	431	return FALSE;
	432	}
	433	if (bytes_read == 0) {
	434	sr_spew("Received 0 bytes, nothing to do.");
	435	return TRUE;
	436	}
	437
	438	sr_dbg("Received %d bytes", bytes_read);
	439
	440	index = 0;
	441	while (index < bytes_read) {
	442	byte = devc->ftdi_buf[index++];
	443	devc->cnt_bytes++;
	444
	445	devc->sample[devc->num_bytes++] = byte;
	446	sr_spew("Received byte 0x%.2x.", byte);
b94cff40	447
	448	if ((devc->flag_reg & FLAG_DEMUX) && (devc->flag_reg & FLAG_RLE)) {
	449	/* RLE in demux mode must be processed differently
	450	* since in this case the RLE encoder is operating on pairs of samples.
	451	*/
	452	if (devc->num_bytes == num_channels * 2) {
	453	devc->cnt_samples += 2;
	454	devc->cnt_samples_rle += 2;
4bd80e12	455	/*
b94cff40	456	* Got a sample pair. Convert from the OLS's little-endian
	457	* sample to the local format.
	458	*/
	459	sample = devc->sample[0] \| (devc->sample[1] << 8) \
	460	\| (devc->sample[2] << 16) \| (devc->sample[3] << 24);
	461	sr_spew("Received sample pair 0x%.x.", devc->num_bytes 2, sample);
	462
	463	/*
	464	* In RLE mode the high bit of the sample pair is the
	465	* "count" flag, meaning this sample pair is the number
	466	* of times the previous sample pair occurred.
4bd80e12	467	*/
	468	if (devc->sample[devc->num_bytes - 1] & 0x80) {
	469	/* Clear the high bit. */
	470	sample &= ~(0x80 << (devc->num_bytes - 1) * 8);
	471	devc->rle_count = sample;
b94cff40	472	devc->cnt_samples_rle += devc->rle_count * 2;
b94cff40	473	sr_dbg("RLE count: %u.", devc->rle_count * 2);
4bd80e12	474	devc->num_bytes = 0;
	475	continue;
	476	}
b94cff40	477	devc->num_samples += (devc->rle_count + 1) * 2;
	478	if (devc->num_samples > devc->limit_samples) {
	479	/* Save us from overrunning the buffer. */
	480	devc->rle_count -= (devc->num_samples - devc->limit_samples) / 2;
	481	devc->num_samples = devc->limit_samples;
	482	index = bytes_read;
	483	}
4bd80e12	484
4bd80e12	485	/*
	486	* Some channel groups may have been turned
	487	* off, to speed up transfer between the
	488	* hardware and the PC. Expand that here before
	489	* submitting it over the session bus --
	490	* whatever is listening on the bus will be
	491	* expecting a full 32-bit sample, based on
	492	* the number of channels.
	493	*/
	494	j = 0;
b94cff40	495	/* expand first sample */
4bd80e12	496	memset(devc->tmp_sample, 0, 4);
b94cff40	497	for (i = 0; i < 2; i++) {
4bd80e12	498	if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
	499	/*
	500	* This channel group was
	501	* enabled, copy from received
	502	* sample.
	503	*/
	504	devc->tmp_sample[i] = devc->sample[j++];
b94cff40	505	}
4bd80e12	506	}
b94cff40	507	/* Clear out the most significant bit of the sample */
b94cff40	508	devc->tmp_sample[devc->num_bytes - 1] &= 0x7f;
6433156c DE	509	sr_spew("Expanded sample 1: 0x%.2x%.2x%.2x%.2x.",
	510	devc->tmp_sample[3], devc->tmp_sample[2],
	511	devc->tmp_sample[1], devc->tmp_sample[0]);
b94cff40	512
	513	/* expand second sample */
	514	memset(devc->tmp_sample2, 0, 4);
	515	for (i = 0; i < 2; i++) {
	516	if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
	517	/*
	518	* This channel group was
	519	* enabled, copy from received
	520	* sample.
	521	*/
	522	devc->tmp_sample2[i] = devc->sample[j++];
	523	}
	524	}
	525	/* Clear out the most significant bit of the sample */
	526	devc->tmp_sample2[devc->num_bytes - 1] &= 0x7f;
6433156c DE	527	sr_spew("Expanded sample 2: 0x%.2x%.2x%.2x%.2x.",
	528	devc->tmp_sample2[3], devc->tmp_sample2[2],
	529	devc->tmp_sample2[1], devc->tmp_sample2[0]);
b94cff40	530
	531	/*
	532	* OLS sends its sample buffer backwards.
	533	* store it in reverse order here, so we can dump
	534	* this on the session bus later.
	535	*/
	536	offset = (devc->limit_samples - devc->num_samples) * 4;
	537	for (i = 0; i <= devc->rle_count; i++) {
	538	memcpy(devc->raw_sample_buf + offset + (i * 8),
	539	devc->tmp_sample2, 4);
	540	memcpy(devc->raw_sample_buf + offset + (4 + (i * 8)),
	541	devc->tmp_sample, 4);
	542	}
	543	memset(devc->sample, 0, 4);
	544	devc->num_bytes = 0;
	545	devc->rle_count = 0;
4bd80e12	546	}
b94cff40	547	}
	548	else {
	549	if (devc->num_bytes == num_channels) {
	550	devc->cnt_samples++;
	551	devc->cnt_samples_rle++;
	552	/*
	553	* Got a full sample. Convert from the OLS's little-endian
	554	* sample to the local format.
	555	*/
	556	sample = devc->sample[0] \| (devc->sample[1] << 8) \
	557	\| (devc->sample[2] << 16) \| (devc->sample[3] << 24);
	558	sr_spew("Received sample 0x%.x.", devc->num_bytes 2, sample);
	559	if (devc->flag_reg & FLAG_RLE) {
	560	/*
	561	* In RLE mode the high bit of the sample is the
	562	* "count" flag, meaning this sample is the number
	563	* of times the previous sample occurred.
	564	*/
	565	if (devc->sample[devc->num_bytes - 1] & 0x80) {
	566	/* Clear the high bit. */
	567	sample &= ~(0x80 << (devc->num_bytes - 1) * 8);
	568	devc->rle_count = sample;
	569	devc->cnt_samples_rle += devc->rle_count;
	570	sr_dbg("RLE count: %u.", devc->rle_count);
	571	devc->num_bytes = 0;
	572	continue;
	573	}
	574	}
	575	devc->num_samples += devc->rle_count + 1;
	576	if (devc->num_samples > devc->limit_samples) {
	577	/* Save us from overrunning the buffer. */
	578	devc->rle_count -= devc->num_samples - devc->limit_samples;
	579	devc->num_samples = devc->limit_samples;
	580	index = bytes_read;
	581	}
	582
	583	if (num_channels < 4) {
	584	/*
	585	* Some channel groups may have been turned
	586	* off, to speed up transfer between the
	587	* hardware and the PC. Expand that here before
	588	* submitting it over the session bus --
	589	* whatever is listening on the bus will be
	590	* expecting a full 32-bit sample, based on
	591	* the number of channels.
	592	*/
	593	j = 0;
	594	memset(devc->tmp_sample, 0, 4);
	595	for (i = 0; i < 4; i++) {
	596	if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
	597	/*
	598	* This channel group was
	599	* enabled, copy from received
	600	* sample.
	601	*/
	602	devc->tmp_sample[i] = devc->sample[j++];
	603	}
	604	}
	605	memcpy(devc->sample, devc->tmp_sample, 4);
	606	sr_spew("Expanded sample: 0x%.8x.", sample);
	607	}
4bd80e12	608
b94cff40	609	/*
	610	* Pipistrello OLS sends its sample buffer backwards.
	611	* store it in reverse order here, so we can dump
	612	* this on the session bus later.
	613	*/
	614	offset = (devc->limit_samples - devc->num_samples) * 4;
	615	for (i = 0; i <= devc->rle_count; i++) {
	616	memcpy(devc->raw_sample_buf + offset + (i * 4),
	617	devc->sample, 4);
	618	}
	619	memset(devc->sample, 0, 4);
	620	devc->num_bytes = 0;
	621	devc->rle_count = 0;
4bd80e12	622	}
4bd80e12	623	}
	624	}
	625	return TRUE;
	626	} else {
dc89faea UH	627	do {
	628	bytes_read = ftdi_read_data(devc->ftdic, devc->ftdi_buf, FTDI_BUF_SIZE);
	629	} while (bytes_read > 0);
b94cff40	630
4bd80e12	631	/*
	632	* We've acquired all the samples we asked for -- we're done.
	633	* Send the (properly-ordered) buffer to the frontend.
	634	*/
	635	sr_dbg("Received %d bytes, %d samples, %d decompressed samples.",
	636	devc->cnt_bytes, devc->cnt_samples,
	637	devc->cnt_samples_rle);
	638	if (devc->trigger_at != -1) {
	639	/*
	640	* A trigger was set up, so we need to tell the frontend
	641	* about it.
	642	*/
	643	if (devc->trigger_at > 0) {
	644	/* There are pre-trigger samples, send those first. */
	645	packet.type = SR_DF_LOGIC;
	646	packet.payload = &logic;
	647	logic.length = devc->trigger_at * 4;
	648	logic.unitsize = 4;
	649	logic.data = devc->raw_sample_buf +
	650	(devc->limit_samples - devc->num_samples) * 4;
	651	sr_session_send(cb_data, &packet);
	652	}
	653
	654	/* Send the trigger. */
	655	packet.type = SR_DF_TRIGGER;
	656	sr_session_send(cb_data, &packet);
	657
	658	/* Send post-trigger samples. */
	659	packet.type = SR_DF_LOGIC;
	660	packet.payload = &logic;
	661	logic.length = (devc->num_samples * 4) - (devc->trigger_at * 4);
	662	logic.unitsize = 4;
	663	logic.data = devc->raw_sample_buf + devc->trigger_at * 4 +
	664	(devc->limit_samples - devc->num_samples) * 4;
	665	sr_session_send(cb_data, &packet);
	666	} else {
	667	/* no trigger was used */
	668	packet.type = SR_DF_LOGIC;
	669	packet.payload = &logic;
	670	logic.length = devc->num_samples * 4;
	671	logic.unitsize = 4;
	672	logic.data = devc->raw_sample_buf +
	673	(devc->limit_samples - devc->num_samples) * 4;
	674	sr_session_send(cb_data, &packet);
	675	}
	676	g_free(devc->raw_sample_buf);
	677
	678	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	679	}
	680
	681	return TRUE;
	682	}