* Values are "channel", "units", "off". Defaults to "units".
*
* time: Whether or not the first column should include the time the sample
- * was taken. Defaults to TRUE.
+ * was taken. Defaults to FALSE.
*
* trigger: Whether or not to add a "trigger" column as the last column.
* Defaults to FALSE.
*
- * dedup: Don't output duplicate rows. Defaults to TRUE. If time is off, then
+ * dedup: Don't output duplicate rows. Defaults to FALSE. If time is off, then
* this is forced to be off.
*/
-#include <math.h>
#include <config.h>
+#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
uint32_t num_samples;
uint32_t channel_count, logic_channel_count;
uint32_t channels_seen;
- uint64_t period;
- uint64_t sample_time;
+ uint64_t sample_rate;
+ uint64_t sample_scale;
+ uint64_t out_sample_count;
uint8_t *previous_sample;
float *analog_samples;
uint8_t *logic_samples;
const char *xlabel; /* Don't free: will point to a static string. */
const char *title; /* Don't free: will point into the driver struct. */
+
+ /* Input data constraints check. */
+ gboolean have_checked;
+ gboolean have_frames;
+ uint64_t pkt_snums;
};
/*
struct sr_channel *ch;
GVariant *gvar;
GString *header;
- GSList *l;
+ GSList *channels, *l;
unsigned int num_channels, i;
- uint64_t samplerate = 0, sr;
char *samplerate_s;
ctx = o->priv;
header = g_string_sized_new(512);
- if (ctx->period == 0) {
+ if (ctx->sample_rate == 0) {
if (sr_config_get(o->sdi->driver, o->sdi, NULL,
SR_CONF_SAMPLERATE, &gvar) == SR_OK) {
- samplerate = g_variant_get_uint64(gvar);
+ ctx->sample_rate = g_variant_get_uint64(gvar);
g_variant_unref(gvar);
}
i = 0;
- sr = 1;
- while (sr < samplerate) {
+ ctx->sample_scale = 1;
+ while (ctx->sample_scale < ctx->sample_rate) {
i++;
- sr *= 1000;
+ ctx->sample_scale *= 1000;
}
- if (samplerate)
- ctx->period = sr / samplerate;
if (i < ARRAY_SIZE(xlabels))
ctx->xlabel = xlabels[i];
- sr_info("Set sample period to %" PRIu64 " %s",
- ctx->period, ctx->xlabel);
+ sr_info("Set sample rate, scale to %" PRIu64 ", %" PRIu64 " %s",
+ ctx->sample_rate, ctx->sample_scale, ctx->xlabel);
}
ctx->title = (o->sdi && o->sdi->driver) ? o->sdi->driver->longname : "unknown";
g_string_append_printf(header,
"%s CSV generated by %s %s\n%s from %s on %s",
ctx->comment, PACKAGE_NAME,
- SR_PACKAGE_VERSION_STRING, ctx->comment,
+ sr_package_version_string_get(), ctx->comment,
ctx->title, ctime(&hdr->starttime.tv_sec));
/* Columns / channels */
- num_channels = g_slist_length(o->sdi->channels);
+ channels = o->sdi ? o->sdi->channels : NULL;
+ num_channels = g_slist_length(channels);
g_string_append_printf(header, "%s Channels (%d/%d):",
ctx->comment, ctx->num_analog_channels +
ctx->num_logic_channels, num_channels);
- for (l = o->sdi->channels; l; l = l->next) {
+ for (l = channels; l; l = l->next) {
ch = l->data;
if (ch->enabled)
g_string_append_printf(header, " %s,", ch->name);
}
- if (o->sdi->channels)
+ if (channels) {
/* Drop last separator. */
g_string_truncate(header, header->len - 1);
+ }
g_string_append_printf(header, "\n");
- if (samplerate != 0) {
- samplerate_s = sr_samplerate_string(samplerate);
+ if (ctx->sample_rate != 0) {
+ samplerate_s = sr_samplerate_string(ctx->sample_rate);
g_string_append_printf(header, "%s Samplerate: %s\n",
ctx->comment, samplerate_s);
g_free(samplerate_s);
ctx->did_header = TRUE;
}
+ /* Time column requested but samplerate unknown. Emit a warning. */
+ if (ctx->time && !ctx->sample_rate)
+ sr_warn("Samplerate unknown, cannot provide timestamps.");
+
return header;
}
const struct sr_datafeed_analog *analog)
{
int ret;
- unsigned int i, j, c, num_channels;
+ size_t num_rcvd_ch, num_have_ch;
+ size_t idx_have, idx_smpl, idx_rcvd;
+ size_t idx_send;
struct sr_analog_meaning *meaning;
GSList *l;
float *fdata = NULL;
+ struct sr_channel *ch;
if (!ctx->analog_samples) {
ctx->analog_samples = g_malloc(analog->num_samples
ctx->num_samples, analog->num_samples);
meaning = analog->meaning;
- num_channels = g_slist_length(meaning->channels);
- ctx->channels_seen += num_channels;
- sr_dbg("Processing packet of %u analog channels", num_channels);
- fdata = g_malloc(analog->num_samples * num_channels * sizeof(float));
+ num_rcvd_ch = g_slist_length(meaning->channels);
+ ctx->channels_seen += num_rcvd_ch;
+ sr_dbg("Processing packet of %zu analog channels", num_rcvd_ch);
+ fdata = g_malloc(analog->num_samples * num_rcvd_ch * sizeof(float));
if ((ret = sr_analog_to_float(analog, fdata)) != SR_OK)
sr_warn("Problems converting data to floating point values.");
- for (i = 0; i < ctx->num_analog_channels + ctx->num_logic_channels; i++) {
- if (ctx->channels[i].ch->type == SR_CHANNEL_ANALOG) {
- sr_dbg("Looking for channel %s",
- ctx->channels[i].ch->name);
- for (l = meaning->channels, c = 0; l; l = l->next, c++) {
- struct sr_channel *ch = l->data;
- sr_dbg("Checking %s", ch->name);
- if (ctx->channels[i].ch == l->data) {
- if (ctx->label_do && !ctx->label_names) {
- sr_analog_unit_to_string(analog,
- &ctx->channels[i].label);
- }
- for (j = 0; j < analog->num_samples; j++)
- ctx->analog_samples[j * ctx->num_analog_channels + i] = fdata[j * num_channels + c];
- break;
- }
+ num_have_ch = ctx->num_analog_channels + ctx->num_logic_channels;
+ idx_send = 0;
+ for (idx_have = 0; idx_have < num_have_ch; idx_have++) {
+ if (ctx->channels[idx_have].ch->type != SR_CHANNEL_ANALOG)
+ continue;
+ sr_dbg("Looking for channel %s",
+ ctx->channels[idx_have].ch->name);
+ for (l = meaning->channels, idx_rcvd = 0; l; l = l->next, idx_rcvd++) {
+ ch = l->data;
+ sr_dbg("Checking %s", ch->name);
+ if (ctx->channels[idx_have].ch != ch)
+ continue;
+ if (ctx->label_do && !ctx->label_names) {
+ sr_analog_unit_to_string(analog,
+ &ctx->channels[idx_have].label);
}
+ for (idx_smpl = 0; idx_smpl < analog->num_samples; idx_smpl++)
+ ctx->analog_samples[idx_smpl * ctx->num_analog_channels + idx_send] = fdata[idx_smpl * num_rcvd_ch + idx_rcvd];
+ break;
}
+ idx_send++;
}
g_free(fdata);
}
static void dump_saved_values(struct context *ctx, GString **out)
{
unsigned int i, j, analog_size, num_channels;
+ double sample_time_dbl;
+ uint64_t sample_time_u64;
float *analog_sample, value;
uint8_t *logic_sample;
if (ctx->label_do) {
if (ctx->time)
g_string_append_printf(*out, "%s%s",
- ctx->label_names ? "Time" :
- ctx->xlabel, ctx->value);
+ ctx->label_names ? "Time" : ctx->xlabel,
+ ctx->value);
for (i = 0; i < num_channels; i++) {
g_string_append_printf(*out, "%s%s",
ctx->channels[i].label, ctx->value);
ctx->previous_sample = g_malloc0(analog_size + ctx->num_logic_channels);
for (i = 0; i < ctx->num_samples; i++) {
- ctx->sample_time += ctx->period;
analog_sample =
&ctx->analog_samples[i * ctx->num_analog_channels];
logic_sample =
analog_sample, analog_size);
}
- if (ctx->time)
+ if (ctx->time && !ctx->sample_rate) {
+ g_string_append_printf(*out, "0%s", ctx->value);
+ } else if (ctx->time) {
+ sample_time_dbl = ctx->out_sample_count++;
+ sample_time_dbl /= ctx->sample_rate;
+ sample_time_dbl *= ctx->sample_scale;
+ sample_time_u64 = sample_time_dbl;
g_string_append_printf(*out, "%" PRIu64 "%s",
- ctx->sample_time, ctx->value);
+ sample_time_u64, ctx->value);
+ }
for (j = 0; j < num_channels; j++) {
if (ctx->channels[j].ch->type == SR_CHANNEL_ANALOG) {
g_string_free(script, TRUE);
}
+static void check_input_constraints(struct context *ctx)
+{
+ size_t snum_count, snum_warn_limit;
+ size_t logic, analog;
+ gboolean has_frames, is_short, is_mixed, is_multi_analog;
+ gboolean do_warn;
+
+ /*
+ * Check and conditionally warn exactly once during execution
+ * of the output module on a set of input data.
+ */
+ if (ctx->have_checked)
+ return;
+ ctx->have_checked = TRUE;
+
+ /*
+ * This implementation of the CSV output module assumes some
+ * constraints which need not be met in reality. Emit warnings
+ * until a better version becomes available. Letting users know
+ * that their request may not get processed correctly is the
+ * only thing we can do for now except for complete refusal to
+ * process the input data.
+ *
+ * What the implementation appears to assume (unverified, this
+ * interpretation may be incorrect and/or incomplete):
+ * - Multi-channel analog data, or mixed signal input, always
+ * is enclosed in frame markers.
+ * - Data which gets received across several packets spans a
+ * consistent sample number range. All samples of one frame
+ * and channel number or data type fit into a single packet.
+ * Arbitrary chunking seems to not be supported.
+ * - A specific order of analog data packets is assumed.
+ *
+ * With these assumptions encoded in the implementation, and
+ * not being met at runtime, incorrect and unexpected results
+ * were seen for these configurations:
+ * - More than one analog channel.
+ * - The combination of logic and analog channel types.
+ *
+ * The condition of frames with large sample counts is a wild
+ * guess, the limit is a totally arbitrary choice. It assumes
+ * typical scope frames with at most a few thousand samples per
+ * frame, and assumes that a channel's data gets sent in large
+ * enough packets. The absence of a warning message does not
+ * necessarily translate to correct output, it's more of a rate
+ * limiting approach to not scare users too much.
+ */
+ snum_count = ctx->pkt_snums;
+ snum_warn_limit = 1 * 1000 * 1000;
+ logic = ctx->num_logic_channels;
+ analog = ctx->num_analog_channels;
+ has_frames = ctx->have_frames;
+ is_short = snum_count < snum_warn_limit;
+ is_mixed = logic && analog;
+ is_multi_analog = analog > 1;
+
+ if (has_frames && is_short) {
+ sr_info("Assuming consistent framed input data.");
+ return;
+ }
+
+ do_warn = FALSE;
+ if (has_frames) {
+ sr_warn("Untested configuration: large frame content.");
+ do_warn = TRUE;
+ }
+ if (is_mixed) {
+ sr_warn("Untested configuration: mixed signal input data.");
+ do_warn = TRUE;
+ }
+ if (is_multi_analog) {
+ sr_warn("Untested configuration: multi-channel analog data.");
+ do_warn = TRUE;
+ }
+ if (!do_warn)
+ return;
+ sr_warn("Resulting CSV output data may be incomplete or incorrect.");
+}
+
static int receive(const struct sr_output *o,
const struct sr_datafeed_packet *packet, GString **out)
{
struct context *ctx;
+ const struct sr_datafeed_logic *logic;
+ const struct sr_datafeed_analog *analog;
*out = NULL;
if (!o || !o->sdi)
sr_dbg("Got packet of type %d", packet->type);
switch (packet->type) {
case SR_DF_HEADER:
+ ctx->have_checked = FALSE;
+ ctx->have_frames = FALSE;
+ ctx->pkt_snums = FALSE;
*out = gen_header(o, packet->payload);
break;
case SR_DF_TRIGGER:
ctx->trigger = TRUE;
break;
case SR_DF_LOGIC:
- process_logic(ctx, packet->payload);
+ logic = packet->payload;
+ ctx->pkt_snums = logic->length;
+ ctx->pkt_snums /= logic->length;
+ check_input_constraints(ctx);
+ process_logic(ctx, logic);
break;
case SR_DF_ANALOG:
- process_analog(ctx, packet->payload);
+ analog = packet->payload;
+ ctx->pkt_snums = analog->num_samples;
+ ctx->pkt_snums /= g_slist_length(analog->meaning->channels);
+ check_input_constraints(ctx);
+ process_analog(ctx, analog);
break;
case SR_DF_FRAME_BEGIN:
+ ctx->have_frames = TRUE;
*out = g_string_new(ctx->frame);
/* Fallthrough */
case SR_DF_END:
static const struct sr_option *get_options(void)
{
+ GSList *l = NULL;
+
if (!options[0].def) {
options[0].def = g_variant_ref_sink(g_variant_new_string(""));
options[1].def = g_variant_ref_sink(g_variant_new_boolean(TRUE));
options[5].def = g_variant_ref_sink(g_variant_new_string(";"));
options[6].def = g_variant_ref_sink(g_variant_new_boolean(TRUE));
options[7].def = g_variant_ref_sink(g_variant_new_string("units"));
- options[8].def = g_variant_ref_sink(g_variant_new_boolean(TRUE));
+ l = g_slist_append(l, g_variant_ref_sink(g_variant_new_string("units")));
+ l = g_slist_append(l, g_variant_ref_sink(g_variant_new_string("channel")));
+ l = g_slist_append(l, g_variant_ref_sink(g_variant_new_string("off")));
+ options[7].values = l;
+ options[8].def = g_variant_ref_sink(g_variant_new_boolean(FALSE));
options[9].def = g_variant_ref_sink(g_variant_new_boolean(FALSE));
- options[10].def = g_variant_ref_sink(g_variant_new_boolean(TRUE));
+ options[10].def = g_variant_ref_sink(g_variant_new_boolean(FALSE));
}
return options;
projects / libsigrok.git / blobdiff