X-Git-Url: http://sigrok.org/gitweb/?a=blobdiff_plain;f=hardware%2Frigol-ds%2Fprotocol.c;h=97cb353c6ca597d1b9fe19b7e94396a0c043d7e8;hb=a4e435eb49c1fa30c31d5851b404001324cafe33;hp=19e660d41b0361dfc25a3e18664cfdbd6f519454;hpb=3086efdd73885820da142ce8c36053bbc3cf0e5f;p=libsigrok.git

diff --git a/hardware/rigol-ds/protocol.c b/hardware/rigol-ds/protocol.c
index 19e660d4..97cb353c 100644
--- a/hardware/rigol-ds/protocol.c
+++ b/hardware/rigol-ds/protocol.c
@@ -3,6 +3,7 @@
  *
  * Copyright (C) 2012 Martin Ling <martin-git@earth.li>
  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
+ * Copyright (C) 2013 Mathias Grimmberger <mgri@zaphod.sax.de>
  *
  * 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
@@ -24,218 +25,712 @@
 #include <errno.h>
 #include <string.h>
 #include <math.h>
+#include <ctype.h>
+#include <time.h>
 #include <glib.h>
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 #include "protocol.h"
 
-SR_PRIV int rigol_ds_receive(int fd, int revents, void *cb_data)
+/*
+ * This is a unified protocol driver for the DS1000 and DS2000 series.
+ *
+ * DS1000 support tested with a Rigol DS1102D.
+ *
+ * DS2000 support tested with a Rigol DS2072 using firmware version 01.01.00.02.
+ *
+ * The Rigol DS2000 series scopes try to adhere to the IEEE 488.2 (I think)
+ * standard. If you want to read it - it costs real money...
+ *
+ * Every response from the scope has a linefeed appended because the
+ * standard says so. In principle this could be ignored because sending the
+ * next command clears the output queue of the scope. This driver tries to
+ * avoid doing that because it may cause an error being generated inside the
+ * scope and who knows what bugs the firmware has WRT this.
+ *
+ * Waveform data is transferred in a format called "arbitrary block program
+ * data" specified in IEEE 488.2. See Agilents programming manuals for their
+ * 2000/3000 series scopes for a nice description.
+ *
+ * Each data block from the scope has a header, e.g. "#900000001400".
+ * The '#' marks the start of a block.
+ * Next is one ASCII decimal digit between 1 and 9, this gives the number of
+ * ASCII decimal digits following.
+ * Last are the ASCII decimal digits giving the number of bytes (not
+ * samples!) in the block.
+ *
+ * After this header as many data bytes as indicated follow.
+ *
+ * Each data block has a trailing linefeed too.
+ */
+
+static int parse_int(const char *str, int *ret)
 {
-	struct sr_dev_inst *sdi;
-	struct sr_serial_dev_inst *serial;
-	struct dev_context *devc;
-	struct sr_datafeed_packet packet;
-	struct sr_datafeed_analog analog;
-	struct sr_datafeed_logic logic;
-	unsigned char buf[DIGITAL_WAVEFORM_SIZE];
-	double vdiv, offset;
-	float data[ANALOG_WAVEFORM_SIZE];
-	int len, i, waveform_size;
-	struct sr_probe *probe;
+	char *e;
+	long tmp;
 
-	(void)fd;
+	errno = 0;
+	tmp = strtol(str, &e, 10);
+	if (e == str || *e != '\0') {
+		sr_dbg("Failed to parse integer: '%s'", str);
+		return SR_ERR;
+	}
+	if (errno) {
+		sr_dbg("Failed to parse integer: '%s', numerical overflow", str);
+		return SR_ERR;
+	}
+	if (tmp > INT_MAX || tmp < INT_MIN) {
+		sr_dbg("Failed to parse integer: '%s', value to large/small", str);
+		return SR_ERR;
+	}
 
-	if (!(sdi = cb_data))
-		return TRUE;
+	*ret = (int)tmp;
+	return SR_OK;
+}
 
-	if (!(devc = sdi->priv))
-		return TRUE;
+/* Set the next event to wait for in rigol_ds_receive */
+static void rigol_ds_set_wait_event(struct dev_context *devc, enum wait_events event)
+{
+	if (event == WAIT_STOP)
+		devc->wait_status = 2;
+	else
+		devc->wait_status = 1;
+	devc->wait_event = event;
+}
 
-	serial = sdi->conn;
+/*
+ * Waiting for a event will return a timeout after 2 to 3 seconds in order
+ * to not block the application.
+ */
+static int rigol_ds_event_wait(const struct sr_dev_inst *sdi, char status1, char status2)
+{
+	char *buf;
+	struct dev_context *devc;
+	time_t start;
 
-	if (revents == G_IO_IN) {
-		probe = devc->channel_frame;
-		waveform_size = probe->type == SR_PROBE_ANALOG ?
-				ANALOG_WAVEFORM_SIZE : DIGITAL_WAVEFORM_SIZE;
-		len = serial_read(serial, buf, waveform_size - devc->num_frame_bytes);
-		sr_dbg("Received %d bytes.", len);
-		if (len == -1)
-			return TRUE;
+	if (!(devc = sdi->priv))
+		return SR_ERR;
 
-		if (devc->num_frame_bytes == 0) {
-			/* Start of a new frame. */
-			packet.type = SR_DF_FRAME_BEGIN;
-			sr_session_send(sdi, &packet);
-		}
+	start = time(NULL);
+
+	/*
+	 * Trigger status may return:
+	 * "TD" or "T'D" - triggered
+	 * "AUTO"        - autotriggered
+	 * "RUN"         - running
+	 * "WAIT"        - waiting for trigger
+	 * "STOP"        - stopped
+	 */
+
+	if (devc->wait_status == 1) {
+		do {
+			if (time(NULL) - start >= 3) {
+				sr_dbg("Timeout waiting for trigger");
+				return SR_ERR_TIMEOUT;
+			}
+
+			if (sr_scpi_get_string(sdi->conn, ":TRIG:STAT?", &buf) != SR_OK)
+				return SR_ERR;
+		} while (buf[0] == status1 || buf[0] == status2);
 
-		if (probe->type == SR_PROBE_ANALOG) {
-			for (i = 0; i < len; i++) {
-				vdiv = devc->vdiv[probe->index];
-				offset = devc->vert_offset[probe->index];
-				data[i] = vdiv / 25.6 * (128 - buf[i]) - offset;
+		devc->wait_status = 2;
+	}
+	if (devc->wait_status == 2) {
+		do {
+			if (time(NULL) - start >= 3) {
+				sr_dbg("Timeout waiting for trigger");
+				return SR_ERR_TIMEOUT;
 			}
-			analog.probes = g_slist_append(NULL, probe);
-			analog.num_samples = len;
-			analog.data = data;
-			analog.mq = SR_MQ_VOLTAGE;
-			analog.unit = SR_UNIT_VOLT;
-			analog.mqflags = 0;
-			packet.type = SR_DF_ANALOG;
-			packet.payload = &analog;
-			sr_session_send(cb_data, &packet);
-			g_slist_free(analog.probes);
 
-			if (len != ANALOG_WAVEFORM_SIZE)
-				/* Don't have the whole frame yet. */
-				return TRUE;
-		} else {
-			logic.length = len - 10;
-			logic.unitsize = 2;
-			logic.data = buf + 10;
-			packet.type = SR_DF_LOGIC;
-			packet.payload = &logic;
-			sr_session_send(cb_data, &packet);
+			if (sr_scpi_get_string(sdi->conn, ":TRIG:STAT?", &buf) != SR_OK)
+				return SR_ERR;
+		} while (buf[0] != status1 && buf[0] != status2);
 
-			if (len != DIGITAL_WAVEFORM_SIZE)
-				/* Don't have the whole frame yet. */
-				return TRUE;
+		rigol_ds_set_wait_event(devc, WAIT_NONE);
+	}
+
+	return SR_OK;
+}
+
+/*
+ * For live capture we need to wait for a new trigger event to ensure that
+ * sample data is not returned twice.
+ *
+ * Unfortunately this will never really work because for sufficiently fast
+ * timebases and trigger rates it just can't catch the status changes.
+ *
+ * What would be needed is a trigger event register with autoreset like the
+ * Agilents have. The Rigols don't seem to have anything like this.
+ *
+ * The workaround is to only wait for the trigger when the timebase is slow
+ * enough. Of course this means that for faster timebases sample data can be
+ * returned multiple times, this effect is mitigated somewhat by sleeping
+ * for about one sweep time in that case.
+ */
+static int rigol_ds_trigger_wait(const struct sr_dev_inst *sdi)
+{
+	struct dev_context *devc;
+	long s;
+
+	if (!(devc = sdi->priv))
+		return SR_ERR;
+
+	/* 
+	 * If timebase < 50 msecs/DIV just sleep about one sweep time except
+	 * for really fast sweeps.
+	 */
+	if (devc->timebase < 0.0499) {
+		if (devc->timebase > 0.99e-6) {
+			/*
+			 * Timebase * num hor. divs * 85(%) * 1e6(usecs) / 100
+			 * -> 85 percent of sweep time
+			 */
+			s = (devc->timebase * devc->model->series->num_horizontal_divs
+			     * 85e6) / 100L;
+			sr_spew("Sleeping for %ld usecs instead of trigger-wait", s);
+			g_usleep(s);
 		}
+		rigol_ds_set_wait_event(devc, WAIT_NONE);
+		return SR_OK;
+	} else {
+		return rigol_ds_event_wait(sdi, 'T', 'A');
+	}
+}
 
-		/* End of the frame. */
-		packet.type = SR_DF_FRAME_END;
-		sr_session_send(sdi, &packet);
-		devc->num_frame_bytes = 0;
-
-		if (devc->enabled_analog_probes
-				&& devc->channel_frame == devc->enabled_analog_probes->data
-				&& devc->enabled_analog_probes->next != NULL) {
-			/* We got the frame for the first analog channel, but
-			 * there's a second analog channel. */
-			devc->channel_frame = devc->enabled_analog_probes->next->data;
-			rigol_ds_send(sdi, ":WAV:DATA? CHAN%c",
-					devc->channel_frame->name[2]);
-		} else {
-			/* Done with both analog channels in this frame. */
-			if (devc->enabled_digital_probes
-					&& devc->channel_frame != devc->enabled_digital_probes->data) {
-				/* Now we need to get the digital data. */
-				devc->channel_frame = devc->enabled_digital_probes->data;
-				rigol_ds_send(sdi, ":WAV:DATA? DIG");
-			} else if (++devc->num_frames == devc->limit_frames) {
-				/* End of last frame. */
-				packet.type = SR_DF_END;
-				sr_session_send(sdi, &packet);
-				sdi->driver->dev_acquisition_stop(sdi, cb_data);
-			} else {
-				/* Get the next frame, starting with the first analog channel. */
-				if (devc->enabled_analog_probes) {
-					devc->channel_frame = devc->enabled_analog_probes->data;
-					rigol_ds_send(sdi, ":WAV:DATA? CHAN%c",
-							devc->channel_frame->name[2]);
-				} else {
-					devc->channel_frame = devc->enabled_digital_probes->data;
-					rigol_ds_send(sdi, ":WAV:DATA? DIG");
-				}
+/* Wait for scope to got to "Stop" in single shot mode */
+static int rigol_ds_stop_wait(const struct sr_dev_inst *sdi)
+{
+	return rigol_ds_event_wait(sdi, 'S', 'S');
+}
+
+/* Check that a single shot acquisition actually succeeded on the DS2000 */
+static int rigol_ds_check_stop(const struct sr_dev_inst *sdi)
+{
+	struct dev_context *devc;
+	struct sr_channel *ch;
+	int tmp;
+
+	if (!(devc = sdi->priv))
+		return SR_ERR;
+
+	ch = devc->channel_entry->data;
+
+	if (devc->model->series->protocol <= PROTOCOL_V2)
+		return SR_OK;
+
+	if (rigol_ds_config_set(sdi, ":WAV:SOUR CHAN%d",
+			  ch->index + 1) != SR_OK)
+		return SR_ERR;
+	/* Check that the number of samples will be accepted */
+	if (rigol_ds_config_set(sdi, ":WAV:POIN %d", devc->analog_frame_size) != SR_OK)
+		return SR_ERR;
+	if (sr_scpi_get_int(sdi->conn, "*ESR?", &tmp) != SR_OK)
+		return SR_ERR;
+	/*
+	 * If we get an "Execution error" the scope went from "Single" to
+	 * "Stop" without actually triggering. There is no waveform
+	 * displayed and trying to download one will fail - the scope thinks
+	 * it has 1400 samples (like display memory) and the driver thinks
+	 * it has a different number of samples.
+	 *
+	 * In that case just try to capture something again. Might still
+	 * fail in interesting ways.
+	 *
+	 * Ain't firmware fun?
+	 */
+	if (tmp & 0x10) {
+		sr_warn("Single shot acquisition failed, retrying...");
+		/* Sleep a bit, otherwise the single shot will often fail */
+		g_usleep(500000);
+		rigol_ds_config_set(sdi, ":SING");
+		rigol_ds_set_wait_event(devc, WAIT_STOP);
+		return SR_ERR;
+	}
+
+	return SR_OK;
+}
+
+/* Wait for enough data becoming available in scope output buffer */
+static int rigol_ds_block_wait(const struct sr_dev_inst *sdi)
+{
+	char *buf;
+	struct dev_context *devc;
+	time_t start;
+	int len;
+
+	if (!(devc = sdi->priv))
+		return SR_ERR;
+
+	if (devc->model->series->protocol >= PROTOCOL_V3) {
+
+		start = time(NULL);
+
+		do {
+			if (time(NULL) - start >= 3) {
+				sr_dbg("Timeout waiting for data block");
+				return SR_ERR_TIMEOUT;
 			}
-		}
+
+			/*
+			 * The scope copies data really slowly from sample
+			 * memory to its output buffer, so try not to bother
+			 * it too much with SCPI requests but don't wait too
+			 * long for short sample frame sizes.
+			 */
+			g_usleep(devc->analog_frame_size < 15000 ? 100000 : 1000000);
+
+			/* "READ,nnnn" (still working) or "IDLE,nnnn" (finished) */
+			if (sr_scpi_get_string(sdi->conn, ":WAV:STAT?", &buf) != SR_OK)
+				return SR_ERR;
+
+			if (parse_int(buf + 5, &len) != SR_OK)
+				return SR_ERR;
+		} while (buf[0] == 'R' && len < 1000000);
 	}
 
-	return TRUE;
+	rigol_ds_set_wait_event(devc, WAIT_NONE);
+
+	return SR_OK;
 }
 
-SR_PRIV int rigol_ds_send(const struct sr_dev_inst *sdi, const char *format, ...)
+/* Send a configuration setting. */
+SR_PRIV int rigol_ds_config_set(const struct sr_dev_inst *sdi, const char *format, ...)
 {
+	struct dev_context *devc = sdi->priv;
 	va_list args;
-	char buf[256];
-	int len, out, ret;
+	int ret;
 
 	va_start(args, format);
-	len = vsnprintf(buf, 255, format, args);
+	ret = sr_scpi_send_variadic(sdi->conn, format, args);
 	va_end(args);
-	strcat(buf, "\n");
-	len++;
-	out = serial_write(sdi->conn, buf, len);
-	buf[len - 1] = '\0';
-	if (out != len) {
-		sr_dbg("Only sent %d/%d bytes of '%s'.", out, len, buf);
-		ret = SR_ERR;
+
+	if (ret != SR_OK)
+		return SR_ERR;
+
+	if (devc->model->series->protocol == PROTOCOL_V2) {
+		/* The DS1000 series needs this stupid delay, *OPC? doesn't work. */
+		sr_spew("delay %dms", 100);
+		g_usleep(100000);
+		return SR_OK;
 	} else {
-		sr_spew("Sent '%s'.", buf);
-		ret = SR_OK;
+		return sr_scpi_get_opc(sdi->conn);
 	}
-
-	return ret;
 }
 
-static int get_cfg(const struct sr_dev_inst *sdi, char *cmd, char *reply)
+/* Start capturing a new frameset */
+SR_PRIV int rigol_ds_capture_start(const struct sr_dev_inst *sdi)
 {
-	int len;
+	struct dev_context *devc;
+	gchar *trig_mode;
 
-	if (rigol_ds_send(sdi, cmd) != SR_OK)
+	if (!(devc = sdi->priv))
 		return SR_ERR;
 
-	if ((len = serial_read(sdi->conn, reply, 255)) < 0)
-		return SR_ERR;
-	reply[len] = '\0';
-	sr_spew("Received '%s'.", reply);
+	sr_dbg("Starting data capture for frameset %lu of %lu",
+	       devc->num_frames + 1, devc->limit_frames);
+
+	switch (devc->model->series->protocol) {
+	case PROTOCOL_V1:
+		rigol_ds_set_wait_event(devc, WAIT_TRIGGER);
+		break;
+	case PROTOCOL_V2:
+		if (devc->data_source == DATA_SOURCE_LIVE) {
+			if (rigol_ds_config_set(sdi, ":WAV:POIN:MODE NORMAL") != SR_OK)
+				return SR_ERR;
+			rigol_ds_set_wait_event(devc, WAIT_TRIGGER);
+		} else {
+			if (rigol_ds_config_set(sdi, ":STOP") != SR_OK)
+				return SR_ERR;
+			if (rigol_ds_config_set(sdi, ":WAV:POIN:MODE RAW") != SR_OK)
+				return SR_ERR;
+			if (sr_scpi_get_string(sdi->conn, ":TRIG:MODE?", &trig_mode) != SR_OK)
+				return SR_ERR;
+			if (rigol_ds_config_set(sdi, ":TRIG:%s:SWE SING", trig_mode) != SR_OK)
+				return SR_ERR;
+			if (rigol_ds_config_set(sdi, ":RUN") != SR_OK)
+				return SR_ERR;
+			rigol_ds_set_wait_event(devc, WAIT_STOP);
+		}
+		break;
+	case PROTOCOL_V3:
+		if (rigol_ds_config_set(sdi, ":WAV:FORM BYTE") != SR_OK)
+			return SR_ERR;
+		if (devc->data_source == DATA_SOURCE_LIVE) {
+			if (rigol_ds_config_set(sdi, ":WAV:MODE NORM") != SR_OK)
+				return SR_ERR;
+			rigol_ds_set_wait_event(devc, WAIT_TRIGGER);
+		} else {
+			if (rigol_ds_config_set(sdi, ":WAV:MODE RAW") != SR_OK)
+				return SR_ERR;
+			if (rigol_ds_config_set(sdi, ":SING") != SR_OK)
+				return SR_ERR;
+			rigol_ds_set_wait_event(devc, WAIT_STOP);
+		}
+		break;
+	}
 
 	return SR_OK;
 }
 
-static int get_cfg_float(const struct sr_dev_inst *sdi, char *cmd, float *f)
+/* Start reading data from the current channel */
+SR_PRIV int rigol_ds_channel_start(const struct sr_dev_inst *sdi)
 {
-	char buf[256], *e;
+	struct dev_context *devc;
+	struct sr_channel *ch;
 
-	if (get_cfg(sdi, cmd, buf) != SR_OK)
-		return SR_ERR;
-	*f = strtof(buf, &e);
-	if (e == buf || (fpclassify(*f) & (FP_ZERO | FP_NORMAL)) == 0) {
-		sr_dbg("failed to parse response to '%s': '%s'", cmd, buf);
+	if (!(devc = sdi->priv))
 		return SR_ERR;
+
+	ch = devc->channel_entry->data;
+
+	sr_dbg("Starting reading data from channel %d", ch->index + 1);
+
+	if (devc->model->series->protocol <= PROTOCOL_V2) {
+		if (ch->type == SR_CHANNEL_LOGIC) {
+			if (sr_scpi_send(sdi->conn, ":WAV:DATA? DIG") != SR_OK)
+				return SR_ERR;
+		} else {
+			if (sr_scpi_send(sdi->conn, ":WAV:DATA? CHAN%d",
+					ch->index + 1) != SR_OK)
+				return SR_ERR;
+		}
+		rigol_ds_set_wait_event(devc, WAIT_NONE);
+	} else {
+		if (rigol_ds_config_set(sdi, ":WAV:SOUR CHAN%d",
+				  ch->index + 1) != SR_OK)
+			return SR_ERR;
+		if (devc->data_source != DATA_SOURCE_LIVE) {
+			if (rigol_ds_config_set(sdi, ":WAV:RES") != SR_OK)
+				return SR_ERR;
+			if (rigol_ds_config_set(sdi, ":WAV:BEG") != SR_OK)
+				return SR_ERR;
+		}
 	}
 
+	rigol_ds_set_wait_event(devc, WAIT_BLOCK);
+
+	devc->num_channel_bytes = 0;
+	devc->num_header_bytes = 0;
+	devc->num_block_bytes = 0;
+
 	return SR_OK;
 }
 
-static int get_cfg_string(const struct sr_dev_inst *sdi, char *cmd, char **buf)
+/* Read the header of a data block */
+static int rigol_ds_read_header(struct sr_dev_inst *sdi)
 {
+	struct sr_scpi_dev_inst *scpi = sdi->conn;
+	struct dev_context *devc = sdi->priv;
+	char *buf = (char *) devc->buffer;
+	size_t header_length;
+	int ret;
+
+	/* Try to read the hashsign and length digit. */
+	if (devc->num_header_bytes < 2) {
+		ret = sr_scpi_read_data(scpi, buf + devc->num_header_bytes,
+				2 - devc->num_header_bytes);
+		if (ret < 0) {
+			sr_err("Read error while reading data header.");
+			return SR_ERR;
+		}
+		devc->num_header_bytes += ret;
+	}
 
-	if (!(*buf = g_try_malloc0(256)))
-		return SR_ERR_MALLOC;
+	if (devc->num_header_bytes < 2)
+		return 0;
 
-	if (get_cfg(sdi, cmd, *buf) != SR_OK)
+	if (buf[0] != '#' || !isdigit(buf[1]) || buf[1] == '0') {
+		sr_err("Received invalid data block header '%c%c'.", buf[0], buf[1]);
 		return SR_ERR;
+	}
 
-	return SR_OK;
+	header_length = 2 + buf[1] - '0';
+
+	/* Try to read the length. */
+	if (devc->num_header_bytes < header_length) {
+		ret = sr_scpi_read_data(scpi, buf + devc->num_header_bytes,
+				header_length - devc->num_header_bytes);
+		if (ret < 0) {
+			sr_err("Read error while reading data header.");
+			return SR_ERR;
+		}
+		devc->num_header_bytes += ret;
+	}
+
+	if (devc->num_header_bytes < header_length)
+		return 0;
+
+	/* Read the data length. */
+	buf[header_length] = '\0';
+
+	if (parse_int(buf + 2, &ret) != SR_OK) {
+		sr_err("Received invalid data block length '%s'.", buf + 2);
+		return -1;
+	}
+
+	sr_dbg("Received data block header: '%s' -> block length %d", buf, ret);
+
+	return ret;
+}
+
+SR_PRIV int rigol_ds_receive(int fd, int revents, void *cb_data)
+{
+	struct sr_dev_inst *sdi;
+	struct sr_scpi_dev_inst *scpi;
+	struct dev_context *devc;
+	struct sr_datafeed_packet packet;
+	struct sr_datafeed_analog analog;
+	struct sr_datafeed_logic logic;
+	double vdiv, offset;
+	int len, i, vref;
+	struct sr_channel *ch;
+	gsize expected_data_bytes;
+
+	(void)fd;
+
+	if (!(sdi = cb_data))
+		return TRUE;
+
+	if (!(devc = sdi->priv))
+		return TRUE;
+
+	scpi = sdi->conn;
+
+	if (revents == G_IO_IN || revents == 0) {
+		switch(devc->wait_event) {
+		case WAIT_NONE:
+			break;
+		case WAIT_TRIGGER:
+			if (rigol_ds_trigger_wait(sdi) != SR_OK)
+				return TRUE;
+			if (rigol_ds_channel_start(sdi) != SR_OK)
+				return TRUE;
+			return TRUE;
+		case WAIT_BLOCK:
+			if (rigol_ds_block_wait(sdi) != SR_OK)
+				return TRUE;
+			break;
+		case WAIT_STOP:
+			if (rigol_ds_stop_wait(sdi) != SR_OK)
+				return TRUE;
+			if (rigol_ds_check_stop(sdi) != SR_OK)
+				return TRUE;
+			if (rigol_ds_channel_start(sdi) != SR_OK)
+				return TRUE;
+			return TRUE;
+		default:
+			sr_err("BUG: Unknown event target encountered");
+		}
+
+		ch = devc->channel_entry->data;
+
+		expected_data_bytes = ch->type == SR_CHANNEL_ANALOG ?
+				devc->analog_frame_size : devc->digital_frame_size;
+
+		if (devc->num_block_bytes == 0) {
+			if (devc->model->series->protocol >= PROTOCOL_V3)
+				if (sr_scpi_send(sdi->conn, ":WAV:DATA?") != SR_OK)
+					return TRUE;
+
+			if (sr_scpi_read_begin(scpi) != SR_OK)
+				return TRUE;
+
+			if (devc->format == FORMAT_IEEE488_2) {
+				sr_dbg("New block header expected");
+				len = rigol_ds_read_header(sdi);
+				if (len == 0)
+					/* Still reading the header. */
+					return TRUE;
+				if (len == -1) {
+					sr_err("Read error, aborting capture.");
+					packet.type = SR_DF_FRAME_END;
+					sr_session_send(cb_data, &packet);
+					sdi->driver->dev_acquisition_stop(sdi, cb_data);
+					return TRUE;
+				}
+				/* At slow timebases in live capture the DS2072
+				 * sometimes returns "short" data blocks, with
+				 * apparently no way to get the rest of the data.
+				 * Discard these, the complete data block will
+				 * appear eventually.
+				 */
+				if (devc->data_source == DATA_SOURCE_LIVE
+						&& (unsigned)len < expected_data_bytes) {
+					sr_dbg("Discarding short data block");
+					sr_scpi_read_data(scpi, (char *)devc->buffer, len + 1);
+					return TRUE;
+				}
+				devc->num_block_bytes = len;
+			} else {
+				devc->num_block_bytes = expected_data_bytes;
+			}
+			devc->num_block_read = 0;
+		}
+
+		len = devc->num_block_bytes - devc->num_block_read;
+		if (len > ACQ_BUFFER_SIZE)
+			len = ACQ_BUFFER_SIZE;
+		sr_dbg("Requesting read of %d bytes", len);
+
+		len = sr_scpi_read_data(scpi, (char *)devc->buffer, len);
+
+		if (len == -1) {
+			sr_err("Read error, aborting capture.");
+			packet.type = SR_DF_FRAME_END;
+			sr_session_send(cb_data, &packet);
+			sdi->driver->dev_acquisition_stop(sdi, cb_data);
+			return TRUE;
+		}
+
+		sr_dbg("Received %d bytes.", len);
+
+		devc->num_block_read += len;
+
+		if (ch->type == SR_CHANNEL_ANALOG) {
+			vref = devc->vert_reference[ch->index];
+			vdiv = devc->vdiv[ch->index] / 25.6;
+			offset = devc->vert_offset[ch->index];
+			if (devc->model->series->protocol >= PROTOCOL_V3)
+				for (i = 0; i < len; i++)
+					devc->data[i] = ((int)devc->buffer[i] - vref) * vdiv - offset;
+			else
+				for (i = 0; i < len; i++)
+					devc->data[i] = (128 - devc->buffer[i]) * vdiv - offset;
+			analog.channels = g_slist_append(NULL, ch);
+			analog.num_samples = len;
+			analog.data = devc->data;
+			analog.mq = SR_MQ_VOLTAGE;
+			analog.unit = SR_UNIT_VOLT;
+			analog.mqflags = 0;
+			packet.type = SR_DF_ANALOG;
+			packet.payload = &analog;
+			sr_session_send(cb_data, &packet);
+			g_slist_free(analog.channels);
+		} else {
+			logic.length = len;
+			logic.unitsize = 2;
+			logic.data = devc->buffer;
+			packet.type = SR_DF_LOGIC;
+			packet.payload = &logic;
+			sr_session_send(cb_data, &packet);
+		}
+
+		if (devc->num_block_read == devc->num_block_bytes) {
+			sr_dbg("Block has been completed");
+			if (devc->model->series->protocol >= PROTOCOL_V3) {
+				/* Discard the terminating linefeed */
+				sr_scpi_read_data(scpi, (char *)devc->buffer, 1);
+			}
+			if (devc->format == FORMAT_IEEE488_2) {
+				/* Prepare for possible next block */
+				devc->num_header_bytes = 0;
+				devc->num_block_bytes = 0;
+				if (devc->data_source != DATA_SOURCE_LIVE)
+					rigol_ds_set_wait_event(devc, WAIT_BLOCK);
+			}
+			if (!sr_scpi_read_complete(scpi)) {
+				sr_err("Read should have been completed");
+				packet.type = SR_DF_FRAME_END;
+				sr_session_send(cb_data, &packet);
+				sdi->driver->dev_acquisition_stop(sdi, cb_data);
+				return TRUE;
+			}
+			devc->num_block_read = 0;
+		} else {
+			sr_dbg("%d of %d block bytes read", devc->num_block_read, devc->num_block_bytes);
+		}
+
+		devc->num_channel_bytes += len;
+
+		if (devc->num_channel_bytes < expected_data_bytes)
+			/* Don't have the full data for this channel yet, re-run. */
+			return TRUE;
+
+		/* End of data for this channel. */
+		if (devc->model->series->protocol >= PROTOCOL_V3) {
+			/* Signal end of data download to scope */
+			if (devc->data_source != DATA_SOURCE_LIVE)
+				/*
+				 * This causes a query error, without it switching
+				 * to the next channel causes an error. Fun with
+				 * firmware...
+				 */
+				rigol_ds_config_set(sdi, ":WAV:END");
+		}
+
+		if (ch->type == SR_CHANNEL_ANALOG
+				&& devc->channel_entry->next != NULL) {
+			/* We got the frame for this analog channel, but
+			 * there's another analog channel. */
+			devc->channel_entry = devc->channel_entry->next;
+			rigol_ds_channel_start(sdi);
+		} else {
+			/* Done with all analog channels in this frame. */
+			if (devc->enabled_digital_channels
+					&& devc->channel_entry != devc->enabled_digital_channels) {
+				/* Now we need to get the digital data. */
+				devc->channel_entry = devc->enabled_digital_channels;
+				rigol_ds_channel_start(sdi);
+			} else {
+				/* Done with this frame. */
+				packet.type = SR_DF_FRAME_END;
+				sr_session_send(cb_data, &packet);
+
+				if (++devc->num_frames == devc->limit_frames) {
+					/* Last frame, stop capture. */
+					sdi->driver->dev_acquisition_stop(sdi, cb_data);
+				} else {
+					/* Get the next frame, starting with the first analog channel. */
+					if (devc->enabled_analog_channels)
+						devc->channel_entry = devc->enabled_analog_channels;
+					else
+						devc->channel_entry = devc->enabled_digital_channels;
+
+					rigol_ds_capture_start(sdi);
+
+					/* Start of next frame. */
+					packet.type = SR_DF_FRAME_BEGIN;
+					sr_session_send(cb_data, &packet);
+				}
+			}
+		}
+	}
+
+	return TRUE;
 }
 
 SR_PRIV int rigol_ds_get_dev_cfg(const struct sr_dev_inst *sdi)
 {
 	struct dev_context *devc;
 	char *t_s, *cmd;
-	int i, res;
+	unsigned int i;
+	int res;
 
 	devc = sdi->priv;
 
 	/* Analog channel state. */
-	if (get_cfg_string(sdi, ":CHAN1:DISP?", &t_s) != SR_OK)
-		return SR_ERR;
-	devc->analog_channels[0] = !strcmp(t_s, "ON") ? TRUE : FALSE;
-	g_free(t_s);
-	if (get_cfg_string(sdi, ":CHAN2:DISP?", &t_s) != SR_OK)
-		return SR_ERR;
-	devc->analog_channels[1] = !strcmp(t_s, "ON") ? TRUE : FALSE;
-	g_free(t_s);
-	sr_dbg("Current analog channel state CH1 %s CH2 %s",
-			devc->analog_channels[0] ? "on" : "off",
-			devc->analog_channels[1] ? "on" : "off");
+	for (i = 0; i < devc->model->analog_channels; i++) {
+		cmd = g_strdup_printf(":CHAN%d:DISP?", i + 1);
+		res = sr_scpi_get_string(sdi->conn, cmd, &t_s);
+		g_free(cmd);
+		if (res != SR_OK)
+			return SR_ERR;
+		devc->analog_channels[i] = !strcmp(t_s, "ON") || !strcmp(t_s, "1");
+	}
+	sr_dbg("Current analog channel state:");
+	for (i = 0; i < devc->model->analog_channels; i++)
+		sr_dbg("CH%d %s", i + 1, devc->analog_channels[i] ? "on" : "off");
 
 	/* Digital channel state. */
-	if (devc->has_digital) {
-		sr_dbg("Current digital channel state:");
+	if (devc->model->has_digital) {
+		if (sr_scpi_get_string(sdi->conn, ":LA:DISP?", &t_s) != SR_OK)
+			return SR_ERR;
+		devc->la_enabled = !strcmp(t_s, "ON") ? TRUE : FALSE;
+		sr_dbg("Logic analyzer %s, current digital channel state:",
+				devc->la_enabled ? "enabled" : "disabled");
 		for (i = 0; i < 16; i++) {
 			cmd = g_strdup_printf(":DIG%d:TURN?", i);
-			res = get_cfg_string(sdi, cmd, &t_s);
+			res = sr_scpi_get_string(sdi->conn, cmd, &t_s);
 			g_free(cmd);
 			if (res != SR_OK)
 				return SR_ERR;
@@ -246,45 +741,70 @@ SR_PRIV int rigol_ds_get_dev_cfg(const struct sr_dev_inst *sdi)
 	}
 
 	/* Timebase. */
-	if (get_cfg_float(sdi, ":TIM:SCAL?", &devc->timebase) != SR_OK)
+	if (sr_scpi_get_float(sdi->conn, ":TIM:SCAL?", &devc->timebase) != SR_OK)
 		return SR_ERR;
-	sr_dbg("Current timebase %f", devc->timebase);
+	sr_dbg("Current timebase %g", devc->timebase);
 
 	/* Vertical gain. */
-	if (get_cfg_float(sdi, ":CHAN1:SCAL?", &devc->vdiv[0]) != SR_OK)
-		return SR_ERR;
-	if (get_cfg_float(sdi, ":CHAN2:SCAL?", &devc->vdiv[1]) != SR_OK)
-		return SR_ERR;
-	sr_dbg("Current vertical gain CH1 %f CH2 %f", devc->vdiv[0], devc->vdiv[1]);
+	for (i = 0; i < devc->model->analog_channels; i++) {
+		cmd = g_strdup_printf(":CHAN%d:SCAL?", i + 1);
+		res = sr_scpi_get_float(sdi->conn, cmd, &devc->vdiv[i]);
+		g_free(cmd);
+		if (res != SR_OK)
+			return SR_ERR;
+	}
+	sr_dbg("Current vertical gain:");
+	for (i = 0; i < devc->model->analog_channels; i++)
+		sr_dbg("CH%d %g", i + 1, devc->vdiv[i]);
+
+	sr_dbg("Current vertical reference:");
+	if (devc->model->series->protocol >= PROTOCOL_V3) {
+		/* Vertical reference - not certain if this is the place to read it. */
+		for (i = 0; i < devc->model->analog_channels; i++) {
+			if (rigol_ds_config_set(sdi, ":WAV:SOUR CHAN%d", i + 1) != SR_OK)
+				return SR_ERR;
+			if (sr_scpi_get_int(sdi->conn, ":WAV:YREF?", &devc->vert_reference[i]) != SR_OK)
+				return SR_ERR;
+			sr_dbg("CH%d %d", i + 1, devc->vert_reference[i]);
+		}
+	}
 
 	/* Vertical offset. */
-	if (get_cfg_float(sdi, ":CHAN1:OFFS?", &devc->vert_offset[0]) != SR_OK)
-		return SR_ERR;
-	if (get_cfg_float(sdi, ":CHAN2:OFFS?", &devc->vert_offset[1]) != SR_OK)
-		return SR_ERR;
-	sr_dbg("Current vertical offset CH1 %f CH2 %f", devc->vert_offset[0],
-			devc->vert_offset[1]);
+	for (i = 0; i < devc->model->analog_channels; i++) {
+		cmd = g_strdup_printf(":CHAN%d:OFFS?", i + 1);
+		res = sr_scpi_get_float(sdi->conn, cmd, &devc->vert_offset[i]);
+		g_free(cmd);
+		if (res != SR_OK)
+			return SR_ERR;
+	}
+	sr_dbg("Current vertical offset:");
+	for (i = 0; i < devc->model->analog_channels; i++)
+		sr_dbg("CH%d %g", i + 1, devc->vert_offset[i]);
 
 	/* Coupling. */
-	if (get_cfg_string(sdi, ":CHAN1:COUP?", &devc->coupling[0]) != SR_OK)
-		return SR_ERR;
-	if (get_cfg_string(sdi, ":CHAN2:COUP?", &devc->coupling[1]) != SR_OK)
-		return SR_ERR;
-	sr_dbg("Current coupling CH1 %s CH2 %s", devc->coupling[0],
-			devc->coupling[1]);
+	for (i = 0; i < devc->model->analog_channels; i++) {
+		cmd = g_strdup_printf(":CHAN%d:COUP?", i + 1);
+		res = sr_scpi_get_string(sdi->conn, cmd, &devc->coupling[i]);
+		g_free(cmd);
+		if (res != SR_OK)
+			return SR_ERR;
+	}
+	sr_dbg("Current coupling:");
+	for (i = 0; i < devc->model->analog_channels; i++)
+		sr_dbg("CH%d %s", i + 1, devc->coupling[i]);
 
 	/* Trigger source. */
-	if (get_cfg_string(sdi, ":TRIG:EDGE:SOUR?", &devc->trigger_source) != SR_OK)
+	if (sr_scpi_get_string(sdi->conn, ":TRIG:EDGE:SOUR?", &devc->trigger_source) != SR_OK)
 		return SR_ERR;
 	sr_dbg("Current trigger source %s", devc->trigger_source);
 
 	/* Horizontal trigger position. */
-	if (get_cfg_float(sdi, ":TIM:OFFS?", &devc->horiz_triggerpos) != SR_OK)
+	if (sr_scpi_get_float(sdi->conn, ":TIM:OFFS?", &devc->horiz_triggerpos) != SR_OK)
 		return SR_ERR;
-	sr_dbg("Current horizontal trigger position %f", devc->horiz_triggerpos);
+	sr_dbg("Current horizontal trigger position %g", devc->horiz_triggerpos);
 
 	/* Trigger slope. */
-	if (get_cfg_string(sdi, ":TRIG:EDGE:SLOP?", &devc->trigger_slope) != SR_OK)
+	if (sr_scpi_get_string(sdi->conn, ":TRIG:EDGE:SLOP?", &devc->trigger_slope) != SR_OK)
 		return SR_ERR;
 	sr_dbg("Current trigger slope %s", devc->trigger_slope);