X-Git-Url: https://sigrok.org/gitweb/?p=libsigrok.git;a=blobdiff_plain;f=src%2Fhardware%2Fyokogawa-dlm%2Fprotocol.c;h=5148c8d7fc039cb37bc7b850b2674ed37e64c114;hp=1849b8b8f9f71c35c01285fb9715178edc2a6fd9;hb=584560f142e1b17b9f4ef9069bd3724f2f77e750;hpb=107639373df3d592961eb70111e6f4ccb36f74fa
diff --git a/src/hardware/yokogawa-dlm/protocol.c b/src/hardware/yokogawa-dlm/protocol.c
index 1849b8b8..5148c8d7 100644
--- a/src/hardware/yokogawa-dlm/protocol.c
+++ b/src/hardware/yokogawa-dlm/protocol.c
@@ -18,5 +18,1002 @@
* along with this program. If not, see .
*/
+/** @file
+ * Yokogawa DL/DLM series oscilloscope driver
+ * @internal
+ */
+
#include "protocol.h"
+static const uint32_t dlm_hwcaps[] = {
+ SR_CONF_LOGIC_ANALYZER,
+ SR_CONF_OSCILLOSCOPE,
+ SR_CONF_TRIGGER_SLOPE,
+ SR_CONF_TRIGGER_SOURCE,
+ SR_CONF_TIMEBASE,
+ SR_CONF_NUM_TIMEBASE,
+ SR_CONF_HORIZ_TRIGGERPOS,
+};
+
+static const uint32_t dlm_analog_caps[] = {
+ SR_CONF_VDIV,
+ SR_CONF_COUPLING,
+ SR_CONF_NUM_VDIV,
+};
+
+static const char *dlm_coupling_options[] = {
+ "AC",
+ "DC",
+ "DC50",
+ "GND",
+ NULL,
+};
+
+/* Note: Values must correlate to the trigger_slopes values */
+static const char *dlm_trigger_slopes[] = {
+ "r",
+ "f",
+ NULL,
+};
+
+static const char *dlm_2ch_trigger_sources[] = {
+ "1",
+ "2",
+ "LINE",
+ "EXT",
+ NULL,
+};
+
+/* TODO: Is BITx handled correctly or is Dx required? */
+static const char *dlm_4ch_trigger_sources[] = {
+ "1",
+ "2",
+ "3",
+ "4",
+ "LINE",
+ "EXT",
+ "BIT1",
+ "BIT2",
+ "BIT3",
+ "BIT4",
+ "BIT5",
+ "BIT6",
+ "BIT7",
+ "BIT8",
+ NULL,
+};
+
+static const uint64_t dlm_timebases[][2] = {
+ /* nanoseconds */
+ { 1, 1000000000 },
+ { 2, 1000000000 },
+ { 5, 1000000000 },
+ { 10, 1000000000 },
+ { 20, 1000000000 },
+ { 50, 1000000000 },
+ { 100, 1000000000 },
+ { 200, 1000000000 },
+ { 500, 1000000000 },
+ /* microseconds */
+ { 1, 1000000 },
+ { 2, 1000000 },
+ { 5, 1000000 },
+ { 10, 1000000 },
+ { 20, 1000000 },
+ { 50, 1000000 },
+ { 100, 1000000 },
+ { 200, 1000000 },
+ { 500, 1000000 },
+ /* milliseconds */
+ { 1, 1000 },
+ { 2, 1000 },
+ { 5, 1000 },
+ { 10, 1000 },
+ { 20, 1000 },
+ { 50, 1000 },
+ { 100, 1000 },
+ { 200, 1000 },
+ { 500, 1000 },
+ /* seconds */
+ { 1, 1 },
+ { 2, 1 },
+ { 5, 1 },
+ { 10, 1 },
+ { 20, 1 },
+ { 50, 1 },
+ { 100, 1 },
+ { 200, 1 },
+ { 500, 1 },
+};
+
+static const uint64_t dlm_vdivs[][2] = {
+ /* millivolts */
+ { 2, 1000 },
+ { 5, 1000 },
+ { 10, 1000 },
+ { 20, 1000 },
+ { 50, 1000 },
+ { 100, 1000 },
+ { 200, 1000 },
+ { 500, 1000 },
+ /* volts */
+ { 1, 1 },
+ { 2, 1 },
+ { 5, 1 },
+ { 10, 1 },
+ { 20, 1 },
+ { 50, 1 },
+ { 100, 1 },
+ { 200, 1 },
+ { 500, 1 },
+};
+
+static const char *scope_analog_channel_names[] = {
+ "1",
+ "2",
+ "3",
+ "4"
+};
+
+static const char *scope_digital_channel_names[] = {
+ "D0",
+ "D1",
+ "D2",
+ "D3",
+ "D4",
+ "D5",
+ "D6",
+ "D7"
+};
+
+static struct scope_config scope_models[] = {
+ {
+ .model_id = {"710105", "710115", "710125", NULL},
+ .model_name = {"DLM2022", "DLM2032", "DLM2052", NULL},
+ .analog_channels = 2,
+ .digital_channels = 0,
+ .pods = 0,
+
+ .analog_names = &scope_analog_channel_names,
+ .digital_names = &scope_digital_channel_names,
+
+ .hw_caps = &dlm_hwcaps,
+ .num_hwcaps = ARRAY_SIZE(dlm_hwcaps),
+
+ .analog_hwcaps = &dlm_analog_caps,
+ .num_analog_hwcaps = ARRAY_SIZE(dlm_analog_caps),
+
+ .coupling_options = &dlm_coupling_options,
+ .trigger_sources = &dlm_2ch_trigger_sources,
+ .trigger_slopes = &dlm_trigger_slopes,
+
+ .timebases = &dlm_timebases,
+ .num_timebases = ARRAY_SIZE(dlm_timebases),
+
+ .vdivs = &dlm_vdivs,
+ .num_vdivs = ARRAY_SIZE(dlm_vdivs),
+
+ .num_xdivs = 10,
+ .num_ydivs = 8,
+ },
+ {
+ .model_id = {"710110", "710120", "710130", NULL},
+ .model_name = {"DLM2024", "DLM2034", "DLM2054", NULL},
+ .analog_channels = 4,
+ .digital_channels = 8,
+ .pods = 1,
+
+ .analog_names = &scope_analog_channel_names,
+ .digital_names = &scope_digital_channel_names,
+
+ .hw_caps = &dlm_hwcaps,
+ .num_hwcaps = ARRAY_SIZE(dlm_hwcaps),
+
+ .analog_hwcaps = &dlm_analog_caps,
+ .num_analog_hwcaps = ARRAY_SIZE(dlm_analog_caps),
+
+ .coupling_options = &dlm_coupling_options,
+ .trigger_sources = &dlm_4ch_trigger_sources,
+ .trigger_slopes = &dlm_trigger_slopes,
+
+ .timebases = &dlm_timebases,
+ .num_timebases = ARRAY_SIZE(dlm_timebases),
+
+ .vdivs = &dlm_vdivs,
+ .num_vdivs = ARRAY_SIZE(dlm_vdivs),
+
+ .num_xdivs = 10,
+ .num_ydivs = 8,
+ },
+};
+
+/**
+ * Prints out the state of the device as we currently know it.
+ *
+ * @param config This is the scope configuration.
+ * @param state The current scope state to print.
+ */
+static void scope_state_dump(struct scope_config *config,
+ struct scope_state *state)
+{
+ unsigned int i;
+ char *tmp;
+
+ for (i = 0; i < config->analog_channels; ++i) {
+ tmp = sr_voltage_string((*config->vdivs)[state->analog_states[i].vdiv][0],
+ (*config->vdivs)[state->analog_states[i].vdiv][1]);
+ sr_info("State of analog channel %d -> %s : %s (coupling) %s (vdiv) %2.2e (offset)",
+ i + 1, state->analog_states[i].state ? "On" : "Off",
+ (*config->coupling_options)[state->analog_states[i].coupling],
+ tmp, state->analog_states[i].vertical_offset);
+ }
+
+ for (i = 0; i < config->digital_channels; ++i) {
+ sr_info("State of digital channel %d -> %s", i,
+ state->digital_states[i] ? "On" : "Off");
+ }
+
+ for (i = 0; i < config->pods; ++i) {
+ sr_info("State of digital POD %d -> %s", i,
+ state->pod_states[i] ? "On" : "Off");
+ }
+
+ tmp = sr_period_string((*config->timebases)[state->timebase][0] *
+ (*config->timebases)[state->timebase][1]);
+ sr_info("Current timebase: %s", tmp);
+ g_free(tmp);
+
+ tmp = sr_samplerate_string(state->sample_rate);
+ sr_info("Current samplerate: %s", tmp);
+ g_free(tmp);
+
+ sr_info("Current samples per acquisition (i.e. frame): %d",
+ state->samples_per_frame);
+
+ sr_info("Current trigger: %s (source), %s (slope) %.2f (offset)",
+ (*config->trigger_sources)[state->trigger_source],
+ (*config->trigger_slopes)[state->trigger_slope],
+ state->horiz_triggerpos);
+}
+
+/**
+ * Searches through an array of strings and returns the index to the
+ * array where a given string is located.
+ *
+ * @param value The string to search for.
+ * @param array The array of strings.
+ * @param result The index at which value is located in array. -1 on error.
+ *
+ * @return SR_ERR when value couldn't be found, SR_OK otherwise.
+ */
+static int array_option_get(char *value, const char *(*array)[],
+ int *result)
+{
+ unsigned int i;
+
+ *result = -1;
+
+ for (i = 0; (*array)[i]; ++i)
+ if (!g_strcmp0(value, (*array)[i])) {
+ *result = i;
+ break;
+ }
+
+ if (*result == -1)
+ return SR_ERR;
+
+ return SR_OK;
+}
+
+/**
+ * This function takes a value of the form "2.000E-03", converts it to a
+ * significand / factor pair and returns the index of an array where
+ * a matching pair was found.
+ *
+ * It's a bit convoluted because of floating-point issues. The value "10.00E-09"
+ * is parsed by g_ascii_strtod() as 0.000000009999999939, for example.
+ * Therefore it's easier to break the number up into two strings and handle
+ * them separately.
+ *
+ * @param value The string to be parsed.
+ * @param array The array of s/f pairs.
+ * @param array_len The number of pairs in the array.
+ * @param result The index at which a matching pair was found.
+ *
+ * @return SR_ERR on any parsing error, SR_OK otherwise.
+ */
+static int array_float_get(gchar *value, const uint64_t array[][2],
+ int array_len, int *result)
+{
+ int i;
+ uint64_t f;
+ float s;
+ unsigned int s_int;
+ gchar ss[10], es[10];
+
+ memset(ss, 0, sizeof(ss));
+ memset(es, 0, sizeof(es));
+
+ strncpy(ss, value, 5);
+ strncpy(es, &(value[6]), 3);
+
+ if (sr_atof_ascii(ss, &s) != SR_OK)
+ return SR_ERR;
+ if (sr_atoi(es, &i) != SR_OK)
+ return SR_ERR;
+
+ /* Transform e.g. 10^-03 to 1000 as the array stores the inverse. */
+ f = pow(10, abs(i));
+
+ /* Adjust the significand/factor pair to make sure
+ * that f is a multiple of 1000.
+ */
+ while ((int)fmod(log10(f), 3) > 0) { s *= 10; f *= 10; }
+
+ /* Truncate s to circumvent rounding errors. */
+ s_int = (unsigned int)s;
+
+ for (i = 0; i < array_len; i++) {
+ if ( (s_int == array[i][0]) && (f == array[i][1]) ) {
+ *result = i;
+ return SR_OK;
+ }
+ }
+
+ return SR_ERR;
+}
+
+/**
+ * Obtains information about all analog channels from the oscilloscope.
+ * The internal state information is updated accordingly.
+ *
+ * @param scpi An open SCPI connection.
+ * @param config The device's device configuration.
+ * @param state The device's state information.
+ *
+ * @return SR_ERR on error, SR_OK otherwise.
+ */
+static int analog_channel_state_get(struct sr_scpi_dev_inst *scpi,
+ struct scope_config *config,
+ struct scope_state *state)
+{
+ int i, j;
+ gchar *response;
+
+ for (i = 0; i < config->analog_channels; ++i) {
+
+ if (dlm_analog_chan_state_get(scpi, i + 1,
+ &state->analog_states[i].state) != SR_OK)
+ return SR_ERR;
+
+ if (dlm_analog_chan_vdiv_get(scpi, i + 1, &response) != SR_OK)
+ return SR_ERR;
+
+ if (array_float_get(response, *config->vdivs, config->num_vdivs,
+ &j) != SR_OK) {
+ g_free(response);
+ return SR_ERR;
+ }
+
+ g_free(response);
+ state->analog_states[i].vdiv = j;
+
+ if (dlm_analog_chan_voffs_get(scpi, i + 1,
+ &state->analog_states[i].vertical_offset) != SR_OK)
+ return SR_ERR;
+
+ if (dlm_analog_chan_wrange_get(scpi, i + 1,
+ &state->analog_states[i].waveform_range) != SR_OK)
+ return SR_ERR;
+
+ if (dlm_analog_chan_woffs_get(scpi, i + 1,
+ &state->analog_states[i].waveform_offset) != SR_OK)
+ return SR_ERR;
+
+ if (dlm_analog_chan_coupl_get(scpi, i + 1, &response) != SR_OK) {
+ g_free(response);
+ return SR_ERR;
+ }
+
+ if (array_option_get(response, config->coupling_options,
+ &state->analog_states[i].coupling) != SR_OK) {
+ g_free(response);
+ return SR_ERR;
+ }
+ g_free(response);
+ }
+
+ return SR_OK;
+}
+
+/**
+ * Obtains information about all digital channels from the oscilloscope.
+ * The internal state information is updated accordingly.
+ *
+ * @param scpi An open SCPI connection.
+ * @param config The device's device configuration.
+ * @param state The device's state information.
+ *
+ * @return SR_ERR on error, SR_OK otherwise.
+ */
+static int digital_channel_state_get(struct sr_scpi_dev_inst *scpi,
+ struct scope_config *config,
+ struct scope_state *state)
+{
+ unsigned int i;
+
+ if (!config->digital_channels)
+ {
+ sr_warn("Tried obtaining digital channel states on a " \
+ "model without digital inputs.");
+ return SR_OK;
+ }
+
+ for (i = 0; i < config->digital_channels; ++i) {
+ if (dlm_digital_chan_state_get(scpi, i + 1,
+ &state->digital_states[i]) != SR_OK) {
+ return SR_ERR;
+ }
+ }
+
+ if (!config->pods)
+ {
+ sr_warn("Tried obtaining pod states on a model without pods.");
+ return SR_OK;
+ }
+
+ for (i = 0; i < config->pods; ++i) {
+ if (dlm_digital_pod_state_get(scpi, i + 'A',
+ &state->pod_states[i]) != SR_OK)
+ return SR_ERR;
+ }
+
+ return SR_OK;
+}
+
+/**
+ * Obtains information about the sample rate from the oscilloscope.
+ * The internal state information is updated accordingly.
+ *
+ * @param sdi The device instance.
+ *
+ * @return SR_ERR on error, SR_OK otherwise.
+ */
+SR_PRIV int dlm_sample_rate_query(const struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ struct scope_state *state;
+ float tmp_float;
+
+ devc = sdi->priv;
+ state = devc->model_state;
+
+ /* No need to find an active channel to query the sample rate:
+ * querying any channel will do, so we use channel 1 all the time.
+ */
+ if (dlm_analog_chan_srate_get(sdi->conn, 1, &tmp_float) != SR_OK)
+ return SR_ERR;
+
+ state->sample_rate = tmp_float;
+
+ return SR_OK;
+}
+
+/**
+ * Obtains information about the current device state from the oscilloscope,
+ * including all analog and digital channel configurations.
+ * The internal state information is updated accordingly.
+ *
+ * @param sdi The device instance.
+ *
+ * @return SR_ERR on error, SR_OK otherwise.
+ */
+SR_PRIV int dlm_scope_state_query(struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ struct scope_state *state;
+ struct scope_config *config;
+ float tmp_float;
+ gchar *response;
+ int i;
+
+ devc = sdi->priv;
+ config = devc->model_config;
+ state = devc->model_state;
+
+ if (analog_channel_state_get(sdi->conn, config, state) != SR_OK)
+ return SR_ERR;
+
+ if (digital_channel_state_get(sdi->conn, config, state) != SR_OK)
+ return SR_ERR;
+
+ if (dlm_timebase_get(sdi->conn, &response) != SR_OK)
+ return SR_ERR;
+
+ if (array_float_get(response, *config->timebases,
+ config->num_timebases, &i) != SR_OK) {
+ g_free(response);
+ return SR_ERR;
+ }
+
+ g_free(response);
+ state->timebase = i;
+
+ if (dlm_horiz_trigger_pos_get(sdi->conn, &tmp_float) != SR_OK)
+ return SR_ERR;
+
+ /* TODO: Check if the calculation makes sense for the DLM. */
+ state->horiz_triggerpos = tmp_float /
+ (((double)(*config->timebases)[state->timebase][0] /
+ (*config->timebases)[state->timebase][1]) * config->num_xdivs);
+ state->horiz_triggerpos -= 0.5;
+ state->horiz_triggerpos *= -1;
+
+ if (dlm_trigger_source_get(sdi->conn, &response) != SR_OK) {
+ g_free(response);
+ return SR_ERR;
+ }
+
+ if (array_option_get(response, config->trigger_sources,
+ &state->trigger_source) != SR_OK) {
+ g_free(response);
+ return SR_ERR;
+ }
+
+ g_free(response);
+
+ if (dlm_trigger_slope_get(sdi->conn, &i) != SR_OK)
+ return SR_ERR;
+
+ state->trigger_slope = i;
+
+ if (dlm_acq_length_get(sdi->conn, &state->samples_per_frame) != SR_OK) {
+ sr_err("Failed to query acquisition length.");
+ return SR_ERR;
+ }
+
+ dlm_sample_rate_query(sdi);
+
+ scope_state_dump(config, state);
+
+ return SR_OK;
+}
+
+/**
+ * Creates a new device state structure.
+ *
+ * @param config The device configuration to use.
+ *
+ * @return The newly allocated scope_state struct.
+ */
+static struct scope_state *dlm_scope_state_new(struct scope_config *config)
+{
+ struct scope_state *state;
+
+ state = g_malloc0(sizeof(struct scope_state));
+
+ state->analog_states = g_malloc0(config->analog_channels *
+ sizeof(struct analog_channel_state));
+
+ state->digital_states = g_malloc0(config->digital_channels *
+ sizeof(gboolean));
+
+ state->pod_states = g_malloc0(config->pods * sizeof(gboolean));
+
+ return state;
+}
+
+/**
+ * Frees the memory that was allocated by a call to dlm_scope_state_new().
+ *
+ * @param state The device state structure whose memory is to be freed.
+ */
+SR_PRIV void dlm_scope_state_destroy(struct scope_state *state)
+{
+ g_free(state->analog_states);
+ g_free(state->digital_states);
+ g_free(state->pod_states);
+ g_free(state);
+}
+
+SR_PRIV int dlm_model_get(char *model_id, char **model_name, int *model_index)
+{
+ unsigned int i, j;
+
+ *model_index = -1;
+ *model_name = NULL;
+
+ for (i = 0; i < ARRAY_SIZE(scope_models); i++) {
+ for (j = 0; scope_models[i].model_id[j]; j++) {
+ if (!strcmp(model_id, scope_models[i].model_id[j])) {
+ *model_index = i;
+ *model_name = (char *)scope_models[i].model_name[j];
+ break;
+ }
+ }
+ if (*model_index != -1)
+ break;
+ }
+
+ if (*model_index == -1) {
+ sr_err("Found unsupported DLM device with model identifier %s.",
+ model_id);
+ return SR_ERR_NA;
+ }
+
+ return SR_OK;
+}
+
+/**
+ * Attempts to initialize a DL/DLM device and prepares internal structures
+ * if a suitable device was found.
+ *
+ * @param sdi The device instance.
+ */
+SR_PRIV int dlm_device_init(struct sr_dev_inst *sdi, int model_index)
+{
+ char tmp[25];
+ int i;
+ struct sr_channel *ch;
+ struct dev_context *devc;
+
+ devc = sdi->priv;
+
+ devc->analog_groups = g_malloc0(sizeof(struct sr_channel_group*) *
+ scope_models[model_index].analog_channels);
+
+ devc->digital_groups = g_malloc0(sizeof(struct sr_channel_group*) *
+ scope_models[model_index].digital_channels);
+
+ /* Add analog channels. */
+ for (i = 0; i < scope_models[model_index].analog_channels; i++) {
+ if (!(ch = sr_channel_new(i, SR_CHANNEL_ANALOG, TRUE,
+ (*scope_models[model_index].analog_names)[i])))
+ return SR_ERR_MALLOC;
+ sdi->channels = g_slist_append(sdi->channels, ch);
+
+ devc->analog_groups[i] = g_malloc0(sizeof(struct sr_channel_group));
+
+ devc->analog_groups[i]->name = g_strdup(
+ (char *)(*scope_models[model_index].analog_names)[i]);
+ devc->analog_groups[i]->channels = g_slist_append(NULL, ch);
+
+ sdi->channel_groups = g_slist_append(sdi->channel_groups,
+ devc->analog_groups[i]);
+ }
+
+ /* Add digital channel groups. */
+ for (i = 0; i < scope_models[model_index].pods; ++i) {
+ g_snprintf(tmp, sizeof(tmp), "POD%d", i);
+
+ devc->digital_groups[i] = g_malloc0(sizeof(struct sr_channel_group));
+ if (!devc->digital_groups[i])
+ return SR_ERR_MALLOC;
+
+ devc->digital_groups[i]->name = g_strdup(tmp);
+ sdi->channel_groups = g_slist_append(sdi->channel_groups,
+ devc->digital_groups[i]);
+ }
+
+ /* Add digital channels. */
+ for (i = 0; i < scope_models[model_index].digital_channels; i++) {
+ if (!(ch = sr_channel_new(i, SR_CHANNEL_LOGIC, TRUE,
+ (*scope_models[model_index].digital_names)[i])))
+ return SR_ERR_MALLOC;
+ sdi->channels = g_slist_append(sdi->channels, ch);
+
+ devc->digital_groups[i / 8]->channels = g_slist_append(
+ devc->digital_groups[i / 8]->channels, ch);
+ }
+ devc->model_config = &scope_models[model_index];
+ devc->frame_limit = 0;
+
+ if (!(devc->model_state = dlm_scope_state_new(devc->model_config)))
+ return SR_ERR_MALLOC;
+
+ /* Disable non-standard response behavior. */
+ if (dlm_response_headers_set(sdi->conn, FALSE) != SR_OK)
+ return SR_ERR;
+
+ return SR_OK;
+}
+
+SR_PRIV int dlm_channel_data_request(const struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ struct sr_channel *ch;
+ int result;
+
+ devc = sdi->priv;
+ ch = devc->current_channel->data;
+
+ switch (ch->type) {
+ case SR_CHANNEL_ANALOG:
+ result = dlm_analog_data_get(sdi->conn, ch->index + 1);
+ break;
+ case SR_CHANNEL_LOGIC:
+ result = dlm_digital_data_get(sdi->conn);
+ break;
+ default:
+ sr_err("Invalid channel type encountered (%d).",
+ ch->type);
+ result = SR_ERR;
+ }
+
+ if (result == SR_OK)
+ devc->data_pending = TRUE;
+ else
+ devc->data_pending = FALSE;
+
+ return result;
+}
+
+/**
+ * Reads and removes the block data header from a given data input.
+ * Format is #ndddd... with n being the number of decimal digits d.
+ * The string dddd... contains the decimal-encoded length of the data.
+ * Example: #9000000013 would yield a length of 13 bytes.
+ *
+ * @param data The input data.
+ * @param len The determined input data length.
+ */
+static int dlm_block_data_header_process(GArray *data, int *len)
+{
+ int i, n;
+ gchar s[20];
+
+ if (g_array_index(data, gchar, 0) != '#')
+ return SR_ERR;
+
+ n = (uint8_t)(g_array_index(data, gchar, 1) - '0');
+
+ for (i = 0; i < n; i++)
+ s[i] = g_array_index(data, gchar, 2 + i);
+ s[i] = 0;
+
+ if (sr_atoi(s, len) != SR_OK)
+ return SR_ERR;
+
+ g_array_remove_range(data, 0, 2 + n);
+
+ return SR_OK;
+}
+
+/**
+ * Turns raw sample data into voltages and sends them off to the session bus.
+ *
+ * @param data The raw sample data.
+ * @ch_state Pointer to the state of the channel whose data we're processing.
+ * @sdi The device instance.
+ *
+ * @return SR_ERR when data is trucated, SR_OK otherwise.
+ */
+static int dlm_analog_samples_send(GArray *data,
+ struct analog_channel_state *ch_state,
+ struct sr_dev_inst *sdi)
+{
+ uint32_t i, samples;
+ float voltage, range, offset;
+ GArray *float_data;
+ struct dev_context *devc;
+ struct scope_state *model_state;
+ struct sr_channel *ch;
+ struct sr_datafeed_analog analog;
+ struct sr_datafeed_packet packet;
+
+ devc = sdi->priv;
+ model_state = devc->model_state;
+ samples = model_state->samples_per_frame;
+ ch = devc->current_channel->data;
+
+ if (data->len < samples * sizeof(uint8_t)) {
+ sr_err("Truncated waveform data packet received.");
+ return SR_ERR;
+ }
+
+ range = ch_state->waveform_range;
+ offset = ch_state->waveform_offset;
+
+ /* Convert byte sample to voltage according to
+ * page 269 of the Communication Interface User's Manual.
+ */
+ float_data = g_array_new(FALSE, FALSE, sizeof(float));
+ for (i = 0; i < samples; i++) {
+ voltage = (float)g_array_index(data, int8_t, i);
+ voltage = (range * voltage /
+ DLM_DIVISION_FOR_BYTE_FORMAT) + offset;
+ g_array_append_val(float_data, voltage);
+ }
+
+ analog.channels = g_slist_append(NULL, ch);
+ analog.num_samples = float_data->len;
+ analog.data = (float*)float_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(sdi, &packet);
+ g_slist_free(analog.channels);
+
+ g_array_free(float_data, TRUE);
+ g_array_remove_range(data, 0, samples * sizeof(uint8_t));
+
+ return SR_OK;
+}
+
+/**
+ * Sends logic sample data off to the session bus.
+ *
+ * @param data The raw sample data.
+ * @ch_state Pointer to the state of the channel whose data we're processing.
+ * @sdi The device instance.
+ *
+ * @return SR_ERR when data is trucated, SR_OK otherwise.
+ */
+static int dlm_digital_samples_send(GArray *data,
+ struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ struct scope_state *model_state;
+ uint32_t samples;
+ struct sr_datafeed_logic logic;
+ struct sr_datafeed_packet packet;
+
+ devc = sdi->priv;
+ model_state = devc->model_state;
+ samples = model_state->samples_per_frame;
+
+ if (data->len < samples * sizeof(uint8_t)) {
+ sr_err("Truncated waveform data packet received.");
+ return SR_ERR;
+ }
+
+ logic.length = samples;
+ logic.unitsize = 1;
+ logic.data = data->data;
+ packet.type = SR_DF_LOGIC;
+ packet.payload = &logic;
+ sr_session_send(sdi, &packet);
+
+ g_array_remove_range(data, 0, samples * sizeof(uint8_t));
+
+ return SR_OK;
+}
+
+/**
+ * Attempts to query sample data from the oscilloscope in order to send it
+ * to the session bus for further processing.
+ *
+ * @param fd The file descriptor used as the event source.
+ * @param revents The received events.
+ * @param cb_data Callback data, in this case our device instance.
+ *
+ * @return TRUE in case of success or a recoverable error,
+ * FALSE when a fatal error was encountered.
+ */
+SR_PRIV int dlm_data_receive(int fd, int revents, void *cb_data)
+{
+ struct sr_dev_inst *sdi;
+ struct scope_state *model_state;
+ struct dev_context *devc;
+ struct sr_channel *ch;
+ struct sr_datafeed_packet packet;
+ int chunk_len, num_bytes;
+ static GArray *data = NULL;
+
+ (void)fd;
+ (void)revents;
+
+ if (!(sdi = cb_data))
+ return FALSE;
+
+ if (!(devc = sdi->priv))
+ return FALSE;
+
+ if (!(model_state = (struct scope_state*)devc->model_state))
+ return FALSE;
+
+ /* Are we waiting for a response from the device? */
+ if (!devc->data_pending)
+ return TRUE;
+
+ /* Check if a new query response is coming our way. */
+ if (!data) {
+ if (sr_scpi_read_begin(sdi->conn) == SR_OK)
+ /* The 16 here accounts for the header and EOL. */
+ data = g_array_sized_new(FALSE, FALSE, sizeof(uint8_t),
+ 16 + model_state->samples_per_frame);
+ else
+ return TRUE;
+ }
+
+ /* Store incoming data. */
+ chunk_len = sr_scpi_read_data(sdi->conn, devc->receive_buffer,
+ RECEIVE_BUFFER_SIZE);
+ if (chunk_len < 0) {
+ sr_err("Error while reading data: %d", chunk_len);
+ goto fail;
+ }
+ g_array_append_vals(data, devc->receive_buffer, chunk_len);
+
+ /* Read the entire query response before processing. */
+ if (!sr_scpi_read_complete(sdi->conn))
+ return TRUE;
+
+ /* We finished reading and are no longer waiting for data. */
+ devc->data_pending = FALSE;
+
+ /* Signal the beginning of a new frame if this is the first channel. */
+ if (devc->current_channel == devc->enabled_channels) {
+ packet.type = SR_DF_FRAME_BEGIN;
+ sr_session_send(sdi, &packet);
+ }
+
+ if (dlm_block_data_header_process(data, &num_bytes) != SR_OK) {
+ sr_err("Encountered malformed block data header.");
+ goto fail;
+ }
+
+ if (num_bytes == 0) {
+ sr_warn("Zero-length waveform data packet received. " \
+ "Live mode not supported yet, stopping " \
+ "acquisition and retrying.");
+ /* Don't care about return value here. */
+ dlm_acquisition_stop(sdi->conn);
+ g_array_free(data, TRUE);
+ dlm_channel_data_request(sdi);
+ return TRUE;
+ }
+
+ ch = devc->current_channel->data;
+ switch (ch->type) {
+ case SR_CHANNEL_ANALOG:
+ if (dlm_analog_samples_send(data,
+ &model_state->analog_states[ch->index],
+ sdi) != SR_OK)
+ goto fail;
+ break;
+ case SR_CHANNEL_LOGIC:
+ if (dlm_digital_samples_send(data, sdi) != SR_OK)
+ goto fail;
+ break;
+ default:
+ sr_err("Invalid channel type encountered.");
+ break;
+ }
+
+ g_array_free(data, TRUE);
+ data = NULL;
+
+ /* Signal the end of this frame if this was the last enabled channel
+ * and set the next enabled channel. Then, request its data.
+ */
+ if (!devc->current_channel->next) {
+ packet.type = SR_DF_FRAME_END;
+ sr_session_send(sdi, &packet);
+ devc->current_channel = devc->enabled_channels;
+
+ /* As of now we only support importing the current acquisition
+ * data so we're going to stop at this point.
+ */
+ sdi->driver->dev_acquisition_stop(sdi, cb_data);
+ return TRUE;
+ } else
+ devc->current_channel = devc->current_channel->next;
+
+ if (dlm_channel_data_request(sdi) != SR_OK) {
+ sr_err("Failed to request aquisition data.");
+ goto fail;
+ }
+
+ return TRUE;
+
+fail:
+ if (data) {
+ g_array_free(data, TRUE);
+ data = NULL;
+ }
+
+ return FALSE;
+}