[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 "protocol.h"

extern SR_PRIV struct sr_dev_driver p_ols_driver_info;
static struct sr_dev_driver *di = &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;
}

SR_PRIV int p_ols_configure_channels(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	const struct sr_channel *ch;
	const GSList *l;
	int channel_bit, stage, i;
	char *tc;

	devc = sdi->priv;

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

	devc->num_stages = 0;
	for (l = sdi->channels; l; l = l->next) {
		ch = (const struct sr_channel *)l->data;
		if (!ch->enabled)
			continue;

		if (ch->index >= devc->max_channels) {
			sr_err("Channels over the limit of %d\n", devc->max_channels);
			return SR_ERR;
		}

		/*
		 * Set up the channel mask for later configuration into the
		 * flag register.
		 */
		channel_bit = 1 << (ch->index);
		devc->channel_mask |= channel_bit;

		if (!ch->trigger)
			continue;

		/* Configure trigger mask and value. */
		stage = 0;
		for (tc = ch->trigger; tc && *tc; tc++) {
			devc->trigger_mask[stage] |= channel_bit;
			if ((*tc == '1') || (*tc == 'r'))
				devc->trigger_value[stage] |= channel_bit;
			if ((*tc == 'r') || (*tc == 'f'))
				devc->trigger_edge[stage] |= channel_bit;
			stage++;
			/* Only supporting parallel mode, with up to 4 stages. */
			if (stage > 3)
				return SR_ERR;
		}
		if (stage > devc->num_stages)
			devc->num_stages = stage - 1;
	}

	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;
	struct sr_channel *ch;
	uint32_t tmp_int, ui;
	uint8_t key, type, token;
	GString *tmp_str, *devname, *version;
	guchar tmp_c;
	int index, i;

	sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, NULL, NULL, NULL);
	sdi->driver = di;
	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++) {
					if (!(ch = sr_channel_new(ui, SR_CHANNEL_LOGIC, TRUE,
							p_ols_channel_names[ui])))
						return 0;
					sdi->channels = g_slist_append(sdi->channels, ch);
				}
				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++) {
					if (!(ch = sr_channel_new(ui, SR_CHANNEL_LOGIC, TRUE,
							p_ols_channel_names[ui])))
						return 0;
					sdi->channels = g_slist_append(sdi->channels, ch);
				}
				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++;
			}
		}
		sr_dbg("num_channels = %d", 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%.8x.", devc->tmp_sample);

					/* 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%.8x.", devc->tmp_sample2);

					/*
					 * 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
	20	#include "protocol.h"
	21
	22	extern SR_PRIV struct sr_dev_driver p_ols_driver_info;
	23	static struct sr_dev_driver *di = &p_ols_driver_info;
	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
	156	SR_PRIV int p_ols_configure_channels(const struct sr_dev_inst *sdi)
	157	{
	158	struct dev_context *devc;
	159	const struct sr_channel *ch;
	160	const GSList *l;
	161	int channel_bit, stage, i;
	162	char *tc;
	163
	164	devc = sdi->priv;
	165
	166	devc->channel_mask = 0;
	167	for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
	168	devc->trigger_mask[i] = 0;
	169	devc->trigger_value[i] = 0;
1e0de846	170	devc->trigger_edge[i] = 0;
4bd80e12	171	}
	172
	173	devc->num_stages = 0;
	174	for (l = sdi->channels; l; l = l->next) {
	175	ch = (const struct sr_channel *)l->data;
	176	if (!ch->enabled)
	177	continue;
	178
	179	if (ch->index >= devc->max_channels) {
	180	sr_err("Channels over the limit of %d\n", devc->max_channels);
	181	return SR_ERR;
	182	}
	183
	184	/*
	185	* Set up the channel mask for later configuration into the
	186	* flag register.
	187	*/
	188	channel_bit = 1 << (ch->index);
	189	devc->channel_mask \|= channel_bit;
	190
	191	if (!ch->trigger)
	192	continue;
	193
	194	/* Configure trigger mask and value. */
	195	stage = 0;
	196	for (tc = ch->trigger; tc && *tc; tc++) {
	197	devc->trigger_mask[stage] \|= channel_bit;
1e0de846	198	if ((tc == '1') \|\| (tc == 'r'))
4bd80e12	199	devc->trigger_value[stage] \|= channel_bit;
1e0de846	200	if ((tc == 'r') \|\| (tc == 'f'))
1e0de846	201	devc->trigger_edge[stage] \|= channel_bit;
4bd80e12	202	stage++;
	203	/* Only supporting parallel mode, with up to 4 stages. */
	204	if (stage > 3)
	205	return SR_ERR;
	206	}
	207	if (stage > devc->num_stages)
	208	devc->num_stages = stage - 1;
	209	}
	210
	211	return SR_OK;
	212	}
	213
	214	SR_PRIV struct sr_dev_inst p_ols_get_metadata(uint8_t buf, int bytes_read, struct dev_context *devc)
	215	{
	216	struct sr_dev_inst *sdi;
	217	struct sr_channel *ch;
	218	uint32_t tmp_int, ui;
	219	uint8_t key, type, token;
	220	GString tmp_str, devname, *version;
	221	guchar tmp_c;
	222	int index, i;
	223
	224	sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, NULL, NULL, NULL);
	225	sdi->driver = di;
	226	sdi->priv = devc;
	227
	228	devname = g_string_new("");
	229	version = g_string_new("");
	230
	231	index = 0;
	232	while (index < bytes_read) {
	233	key = buf[index++];
	234	if (key == 0x00) {
	235	sr_dbg("Got metadata key 0x00, metadata ends.");
	236	break;
	237	}
	238	type = key >> 5;
	239	token = key & 0x1f;
	240	switch (type) {
	241	case 0:
	242	/* NULL-terminated string */
	243	tmp_str = g_string_new("");
	244	while ((index < bytes_read) && ((tmp_c = buf[index++]) != '\0'))
	245	g_string_append_c(tmp_str, tmp_c);
	246	sr_dbg("Got metadata key 0x%.2x value '%s'.",
	247	key, tmp_str->str);
	248	switch (token) {
	249	case 0x01:
	250	/* Device name */
	251	devname = g_string_append(devname, tmp_str->str);
	252	break;
	253	case 0x02:
	254	/* FPGA firmware version */
	255	if (version->len)
	256	g_string_append(version, ", ");
	257	g_string_append(version, "FPGA version ");
	258	g_string_append(version, tmp_str->str);
	259	break;
	260	case 0x03:
	261	/* Ancillary version */
	262	if (version->len)
	263	g_string_append(version, ", ");
	264	g_string_append(version, "Ancillary version ");
	265	g_string_append(version, tmp_str->str);
266	break;
267	default:
268	sr_info("Unknown token 0x%.2x: '%s'",
269	token, tmp_str->str);
270	break;
271	}
272	g_string_free(tmp_str, TRUE);
273	break;
274	case 1:
275	/* 32-bit unsigned integer */
276	tmp_int = 0;
277	for (i = 0; i < 4; i++) {
278	tmp_int = (tmp_int << 8) \| buf[index++];
279	}
280	sr_dbg("Got metadata key 0x%.2x value 0x%.8x.",
281	key, tmp_int);
282	switch (token) {
283	case 0x00:
284	/* Number of usable channels */
285	for (ui = 0; ui < tmp_int; ui++) {
286	if (!(ch = sr_channel_new(ui, SR_CHANNEL_LOGIC, TRUE,
287	p_ols_channel_names[ui])))
288	return 0;
289	sdi->channels = g_slist_append(sdi->channels, ch);
290	}
291	break;
292	case 0x01:
293	/* Amount of sample memory available (bytes) */
b94cff40	294	devc->max_samplebytes = tmp_int;
4bd80e12	295	break;
	296	case 0x02:
	297	/* Amount of dynamic memory available (bytes) */
	298	/* what is this for? */
	299	break;
	300	case 0x03:
	301	/* Maximum sample rate (hz) */
	302	devc->max_samplerate = tmp_int;
	303	break;
	304	case 0x04:
	305	/* protocol version */
	306	devc->protocol_version = tmp_int;
	307	break;
	308	default:
	309	sr_info("Unknown token 0x%.2x: 0x%.8x.",
	310	token, tmp_int);
	311	break;
	312	}
	313	break;
	314	case 2:
	315	/* 8-bit unsigned integer */
	316	tmp_c = buf[index++];
	317	sr_dbg("Got metadata key 0x%.2x value 0x%.2x.",
	318	key, tmp_c);
	319	switch (token) {
	320	case 0x00:
	321	/* Number of usable channels */
	322	for (ui = 0; ui < tmp_c; ui++) {
	323	if (!(ch = sr_channel_new(ui, SR_CHANNEL_LOGIC, TRUE,
	324	p_ols_channel_names[ui])))
	325	return 0;
	326	sdi->channels = g_slist_append(sdi->channels, ch);
	327	}
	328	break;
	329	case 0x01:
	330	/* protocol version */
	331	devc->protocol_version = tmp_c;
	332	break;
	333	default:
	334	sr_info("Unknown token 0x%.2x: 0x%.2x.",
	335	token, tmp_c);
	336	break;
	337	}
	338	break;
	339	default:
	340	/* unknown type */
	341	break;
	342	}
	343	}
	344
	345	sdi->model = devname->str;
	346	sdi->version = version->str;
	347	g_string_free(devname, FALSE);
	348	g_string_free(version, FALSE);
	349
	350	return sdi;
	351	}
	352
	353	SR_PRIV int p_ols_set_samplerate(const struct sr_dev_inst *sdi,
	354	const uint64_t samplerate)
	355	{
	356	struct dev_context *devc;
	357
	358	devc = sdi->priv;
359	if (devc->max_samplerate && samplerate > devc->max_samplerate)
360	return SR_ERR_SAMPLERATE;
361
362	if (samplerate > CLOCK_RATE) {
363	sr_info("Enabling demux mode.");
364	devc->flag_reg \|= FLAG_DEMUX;
365	devc->flag_reg &= ~FLAG_FILTER;
366	devc->max_channels = NUM_CHANNELS / 2;
367	devc->cur_samplerate_divider = (CLOCK_RATE * 2 / samplerate) - 1;
368	} else {
369	sr_info("Disabling demux mode.");
370	devc->flag_reg &= ~FLAG_DEMUX;
371	devc->flag_reg \|= FLAG_FILTER;
372	devc->max_channels = NUM_CHANNELS;
373	devc->cur_samplerate_divider = (CLOCK_RATE / samplerate) - 1;
374	}
375
376	/* Calculate actual samplerate used and complain if it is different
377	* from the requested.
378	*/
379	devc->cur_samplerate = CLOCK_RATE / (devc->cur_samplerate_divider + 1);
380	if (devc->flag_reg & FLAG_DEMUX)
381	devc->cur_samplerate *= 2;
382	if (devc->cur_samplerate != samplerate)
383	sr_info("Can't match samplerate %" PRIu64 ", using %"
384	PRIu64 ".", samplerate, devc->cur_samplerate);
385
386	return SR_OK;
387	}
388
389
390	SR_PRIV int p_ols_receive_data(int fd, int revents, void *cb_data)
391	{
392	struct dev_context *devc;
393	struct sr_dev_inst *sdi;
394	struct sr_datafeed_packet packet;
395	struct sr_datafeed_logic logic;
396	uint32_t sample;
397	int num_channels, offset, j;
398	int bytes_read, index;
399	unsigned int i;
400	unsigned char byte;
401
402	(void)fd;
403	(void)revents;
404
405	sdi = cb_data;
406	devc = sdi->priv;
407
408	if (devc->num_transfers++ == 0) {
409	devc->raw_sample_buf = g_try_malloc(devc->limit_samples * 4);
410	if (!devc->raw_sample_buf) {
411	sr_err("Sample buffer malloc failed.");
412	return FALSE;
413	}
414	/* fill with 1010... for debugging */
415	memset(devc->raw_sample_buf, 0x82, devc->limit_samples * 4);
416	}
417
b94cff40	418	if ((devc->num_samples < devc->limit_samples) && (devc->cnt_samples < devc->max_samples)) {
4bd80e12	419
	420	num_channels = 0;
	421	for (i = NUM_CHANNELS; i > 0x02; i /= 2) {
	422	if ((devc->flag_reg & i) == 0) {
	423	num_channels++;
	424	}
	425	}
b94cff40	426	sr_dbg("num_channels = %d", num_channels);
4bd80e12	427
	428	/* Get a block of data. */
	429	bytes_read = ftdi_read_data(devc->ftdic, devc->ftdi_buf, FTDI_BUF_SIZE);
	430	if (bytes_read < 0) {
	431	sr_err("Failed to read FTDI data (%d): %s.",
	432	bytes_read, ftdi_get_error_string(devc->ftdic));
	433	sdi->driver->dev_acquisition_stop(sdi, sdi);
	434	return FALSE;
	435	}
	436	if (bytes_read == 0) {
	437	sr_spew("Received 0 bytes, nothing to do.");
	438	return TRUE;
	439	}
	440
	441	sr_dbg("Received %d bytes", bytes_read);
	442
	443	index = 0;
	444	while (index < bytes_read) {
	445	byte = devc->ftdi_buf[index++];
	446	devc->cnt_bytes++;
	447
	448	devc->sample[devc->num_bytes++] = byte;
	449	sr_spew("Received byte 0x%.2x.", byte);
b94cff40	450
	451	if ((devc->flag_reg & FLAG_DEMUX) && (devc->flag_reg & FLAG_RLE)) {
	452	/* RLE in demux mode must be processed differently
	453	* since in this case the RLE encoder is operating on pairs of samples.
	454	*/
	455	if (devc->num_bytes == num_channels * 2) {
	456	devc->cnt_samples += 2;
	457	devc->cnt_samples_rle += 2;
4bd80e12	458	/*
b94cff40	459	* Got a sample pair. Convert from the OLS's little-endian
	460	* sample to the local format.
	461	*/
	462	sample = devc->sample[0] \| (devc->sample[1] << 8) \
	463	\| (devc->sample[2] << 16) \| (devc->sample[3] << 24);
	464	sr_spew("Received sample pair 0x%.x.", devc->num_bytes 2, sample);
	465
	466	/*
	467	* In RLE mode the high bit of the sample pair is the
	468	* "count" flag, meaning this sample pair is the number
	469	* of times the previous sample pair occurred.
4bd80e12	470	*/
	471	if (devc->sample[devc->num_bytes - 1] & 0x80) {
	472	/* Clear the high bit. */
	473	sample &= ~(0x80 << (devc->num_bytes - 1) * 8);
	474	devc->rle_count = sample;
b94cff40	475	devc->cnt_samples_rle += devc->rle_count * 2;
b94cff40	476	sr_dbg("RLE count: %u.", devc->rle_count * 2);
4bd80e12	477	devc->num_bytes = 0;
	478	continue;
	479	}
b94cff40	480	devc->num_samples += (devc->rle_count + 1) * 2;
	481	if (devc->num_samples > devc->limit_samples) {
	482	/* Save us from overrunning the buffer. */
	483	devc->rle_count -= (devc->num_samples - devc->limit_samples) / 2;
	484	devc->num_samples = devc->limit_samples;
	485	index = bytes_read;
	486	}
4bd80e12	487
4bd80e12	488	/*
	489	* Some channel groups may have been turned
	490	* off, to speed up transfer between the
	491	* hardware and the PC. Expand that here before
	492	* submitting it over the session bus --
	493	* whatever is listening on the bus will be
	494	* expecting a full 32-bit sample, based on
	495	* the number of channels.
	496	*/
	497	j = 0;
b94cff40	498	/* expand first sample */
4bd80e12	499	memset(devc->tmp_sample, 0, 4);
b94cff40	500	for (i = 0; i < 2; i++) {
4bd80e12	501	if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
	502	/*
	503	* This channel group was
	504	* enabled, copy from received
	505	* sample.
	506	*/
	507	devc->tmp_sample[i] = devc->sample[j++];
b94cff40	508	}
4bd80e12	509	}
b94cff40	510	/* Clear out the most significant bit of the sample */
	511	devc->tmp_sample[devc->num_bytes - 1] &= 0x7f;
	512	sr_spew("Expanded sample 1: 0x%.8x.", devc->tmp_sample);
	513
	514	/* expand second sample */
	515	memset(devc->tmp_sample2, 0, 4);
	516	for (i = 0; i < 2; i++) {
	517	if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
	518	/*
	519	* This channel group was
	520	* enabled, copy from received
	521	* sample.
	522	*/
	523	devc->tmp_sample2[i] = devc->sample[j++];
	524	}
	525	}
	526	/* Clear out the most significant bit of the sample */
	527	devc->tmp_sample2[devc->num_bytes - 1] &= 0x7f;
	528	sr_spew("Expanded sample 2: 0x%.8x.", devc->tmp_sample2);
	529
	530	/*
	531	* OLS sends its sample buffer backwards.
	532	* store it in reverse order here, so we can dump
	533	* this on the session bus later.
	534	*/
	535	offset = (devc->limit_samples - devc->num_samples) * 4;
	536	for (i = 0; i <= devc->rle_count; i++) {
	537	memcpy(devc->raw_sample_buf + offset + (i * 8),
	538	devc->tmp_sample2, 4);
	539	memcpy(devc->raw_sample_buf + offset + (4 + (i * 8)),
	540	devc->tmp_sample, 4);
	541	}
	542	memset(devc->sample, 0, 4);
	543	devc->num_bytes = 0;
	544	devc->rle_count = 0;
4bd80e12	545	}
b94cff40	546	}
	547	else {
	548	if (devc->num_bytes == num_channels) {
	549	devc->cnt_samples++;
	550	devc->cnt_samples_rle++;
	551	/*
	552	* Got a full sample. Convert from the OLS's little-endian
	553	* sample to the local format.
	554	*/
	555	sample = devc->sample[0] \| (devc->sample[1] << 8) \
	556	\| (devc->sample[2] << 16) \| (devc->sample[3] << 24);
	557	sr_spew("Received sample 0x%.x.", devc->num_bytes 2, sample);
	558	if (devc->flag_reg & FLAG_RLE) {
	559	/*
	560	* In RLE mode the high bit of the sample is the
	561	* "count" flag, meaning this sample is the number
	562	* of times the previous sample occurred.
	563	*/
	564	if (devc->sample[devc->num_bytes - 1] & 0x80) {
	565	/* Clear the high bit. */
	566	sample &= ~(0x80 << (devc->num_bytes - 1) * 8);
	567	devc->rle_count = sample;
	568	devc->cnt_samples_rle += devc->rle_count;
	569	sr_dbg("RLE count: %u.", devc->rle_count);
	570	devc->num_bytes = 0;
	571	continue;
	572	}
	573	}
	574	devc->num_samples += devc->rle_count + 1;
	575	if (devc->num_samples > devc->limit_samples) {
	576	/* Save us from overrunning the buffer. */
	577	devc->rle_count -= devc->num_samples - devc->limit_samples;
	578	devc->num_samples = devc->limit_samples;
	579	index = bytes_read;
	580	}
	581
	582	if (num_channels < 4) {
	583	/*
	584	* Some channel groups may have been turned
	585	* off, to speed up transfer between the
	586	* hardware and the PC. Expand that here before
	587	* submitting it over the session bus --
	588	* whatever is listening on the bus will be
	589	* expecting a full 32-bit sample, based on
	590	* the number of channels.
	591	*/
	592	j = 0;
	593	memset(devc->tmp_sample, 0, 4);
	594	for (i = 0; i < 4; i++) {
	595	if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
	596	/*
	597	* This channel group was
	598	* enabled, copy from received
	599	* sample.
	600	*/
	601	devc->tmp_sample[i] = devc->sample[j++];
	602	}
	603	}
	604	memcpy(devc->sample, devc->tmp_sample, 4);
	605	sr_spew("Expanded sample: 0x%.8x.", sample);
	606	}
4bd80e12	607
b94cff40	608	/*
	609	* Pipistrello OLS sends its sample buffer backwards.
	610	* store it in reverse order here, so we can dump
	611	* this on the session bus later.
	612	*/
	613	offset = (devc->limit_samples - devc->num_samples) * 4;
	614	for (i = 0; i <= devc->rle_count; i++) {
	615	memcpy(devc->raw_sample_buf + offset + (i * 4),
	616	devc->sample, 4);
	617	}
	618	memset(devc->sample, 0, 4);
	619	devc->num_bytes = 0;
	620	devc->rle_count = 0;
4bd80e12	621	}
4bd80e12	622	}
	623	}
	624	return TRUE;
	625	} else {
b94cff40	626	do bytes_read = ftdi_read_data(devc->ftdic, devc->ftdi_buf, FTDI_BUF_SIZE);
	627	while (bytes_read > 0);
	628
4bd80e12	629	/*
	630	* We've acquired all the samples we asked for -- we're done.
	631	* Send the (properly-ordered) buffer to the frontend.
	632	*/
	633	sr_dbg("Received %d bytes, %d samples, %d decompressed samples.",
	634	devc->cnt_bytes, devc->cnt_samples,
	635	devc->cnt_samples_rle);
	636	if (devc->trigger_at != -1) {
	637	/*
	638	* A trigger was set up, so we need to tell the frontend
	639	* about it.
	640	*/
	641	if (devc->trigger_at > 0) {
	642	/* There are pre-trigger samples, send those first. */
	643	packet.type = SR_DF_LOGIC;
	644	packet.payload = &logic;
	645	logic.length = devc->trigger_at * 4;
	646	logic.unitsize = 4;
	647	logic.data = devc->raw_sample_buf +
	648	(devc->limit_samples - devc->num_samples) * 4;
	649	sr_session_send(cb_data, &packet);
	650	}
	651
	652	/* Send the trigger. */
	653	packet.type = SR_DF_TRIGGER;
	654	sr_session_send(cb_data, &packet);
	655
	656	/* Send post-trigger samples. */
	657	packet.type = SR_DF_LOGIC;
	658	packet.payload = &logic;
	659	logic.length = (devc->num_samples * 4) - (devc->trigger_at * 4);
	660	logic.unitsize = 4;
	661	logic.data = devc->raw_sample_buf + devc->trigger_at * 4 +
	662	(devc->limit_samples - devc->num_samples) * 4;
	663	sr_session_send(cb_data, &packet);
	664	} else {
	665	/* no trigger was used */
	666	packet.type = SR_DF_LOGIC;
	667	packet.payload = &logic;
	668	logic.length = devc->num_samples * 4;
	669	logic.unitsize = 4;
	670	logic.data = devc->raw_sample_buf +
	671	(devc->limit_samples - devc->num_samples) * 4;
	672	sr_session_send(cb_data, &packet);
	673	}
	674	g_free(devc->raw_sample_buf);
	675
	676	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	677	}
	678
	679	return TRUE;
	680	}