{
struct dev_context *devc;
uint64_t num_samples;
- int ret;
+ int ret = 0;
(void)cg;
}
/* Software trigger to determine exact trigger position. */
-static int get_trigger_offset(uint16_t *samples, uint16_t last_sample,
+static int get_trigger_offset(uint8_t *samples, uint16_t last_sample,
struct sigma_trigger *t)
{
int i;
+ uint16_t sample = 0;
for (i = 0; i < 8; ++i) {
if (i > 0)
- last_sample = samples[i-1];
+ last_sample = sample;
+ sample = samples[2 * i] | (samples[2 * i + 1] << 8);
/* Simple triggers. */
- if ((samples[i] & t->simplemask) != t->simplevalue)
+ if ((sample & t->simplemask) != t->simplevalue)
continue;
/* Rising edge. */
- if ((last_sample & t->risingmask) != 0 || (samples[i] &
- t->risingmask) != t->risingmask)
+ if (((last_sample & t->risingmask) != 0) ||
+ ((sample & t->risingmask) != t->risingmask))
continue;
/* Falling edge. */
if ((last_sample & t->fallingmask) != t->fallingmask ||
- (samples[i] & t->fallingmask) != 0)
+ (sample & t->fallingmask) != 0)
continue;
break;
return i & 0x7;
}
+
/*
- * Decode chunk of 1024 bytes, 64 clusters, 7 events per cluster.
- * Each event is 20ns apart, and can contain multiple samples.
- *
- * For 200 MHz, events contain 4 samples for each channel, spread 5 ns apart.
- * For 100 MHz, events contain 2 samples for each channel, spread 10 ns apart.
- * For 50 MHz and below, events contain one sample for each channel,
- * spread 20 ns apart.
+ * Return the timestamp of "DRAM cluster".
*/
-static int decode_chunk_ts(uint8_t *buf, uint16_t *lastts,
- uint16_t *lastsample, int triggerpos,
- uint16_t limit_chunk, void *cb_data)
+static uint16_t sigma_dram_cluster_ts(struct sigma_dram_cluster *cluster)
+{
+ return (cluster->timestamp_hi << 8) | cluster->timestamp_lo;
+}
+
+static void sigma_decode_dram_cluster(struct sigma_dram_cluster *dram_cluster,
+ unsigned int events_in_cluster,
+ struct sr_dev_inst *sdi)
{
- struct sr_dev_inst *sdi = cb_data;
struct dev_context *devc = sdi->priv;
- uint16_t tsdiff, ts;
- uint16_t samples[65536 * devc->samples_per_event];
+ struct sigma_state *ss = &devc->state;
struct sr_datafeed_packet packet;
struct sr_datafeed_logic logic;
- int i, j, k, l, numpad, tosend;
- size_t n = 0, sent = 0;
- int clustersize = EVENTS_PER_CLUSTER * devc->samples_per_event;
- uint16_t *event;
- uint16_t cur_sample;
- int triggerts = -1;
-
- /* Check if trigger is in this chunk. */
- if (triggerpos != -1) {
- if (devc->cur_samplerate <= SR_MHZ(50))
- triggerpos -= EVENTS_PER_CLUSTER - 1;
-
- if (triggerpos < 0)
- triggerpos = 0;
+ uint16_t tsdiff, ts;
+ uint8_t samples[2048];
+ unsigned int i;
- /* Find in which cluster the trigger occured. */
- triggerts = triggerpos / 7;
- }
+ int triggerts = -1;
- /* For each ts. */
- for (i = 0; i < 64; ++i) {
- ts = *(uint16_t *) &buf[i * 16];
- tsdiff = ts - *lastts;
- *lastts = ts;
+ ts = sigma_dram_cluster_ts(dram_cluster);
+ tsdiff = ts - ss->lastts;
+ ss->lastts = ts;
- /* Decode partial chunk. */
- if (limit_chunk && ts > limit_chunk)
- return SR_OK;
+ packet.type = SR_DF_LOGIC;
+ packet.payload = &logic;
+ logic.unitsize = 2;
+ logic.data = samples;
- /* Pad last sample up to current point. */
- numpad = tsdiff * devc->samples_per_event - clustersize;
- if (numpad > 0) {
- for (j = 0; j < numpad; ++j)
- samples[j] = *lastsample;
+ /*
+ * First of all, send Sigrok a copy of the last sample from
+ * previous cluster as many times as needed to make up for
+ * the differential characteristics of data we get from the
+ * Sigma. Sigrok needs one sample of data per period.
+ *
+ * One DRAM cluster contains a timestamp and seven samples,
+ * the units of timestamp are "devc->period_ps" , the first
+ * sample in the cluster happens at the time of the timestamp
+ * and the remaining samples happen at timestamp +1...+6 .
+ */
+ for (ts = 0; ts < tsdiff - (EVENTS_PER_CLUSTER - 1); ts++) {
+ i = ts % 1024;
+ samples[2 * i + 0] = ss->lastsample & 0xff;
+ samples[2 * i + 1] = ss->lastsample >> 8;
- n = numpad;
+ /*
+ * If we have 1024 samples ready or we're at the
+ * end of submitting the padding samples, submit
+ * the packet to Sigrok.
+ */
+ if ((i == 1023) || (ts == (tsdiff - EVENTS_PER_CLUSTER))) {
+ logic.length = (i + 1) * logic.unitsize;
+ sr_session_send(devc->cb_data, &packet);
}
+ }
- /* Send samples between previous and this timestamp to sigrok. */
- sent = 0;
- while (sent < n) {
- tosend = MIN(2048, n - sent);
+ /*
+ * Parse the samples in current cluster and prepare them
+ * to be submitted to Sigrok.
+ */
+ for (i = 0; i < events_in_cluster; i++) {
+ samples[2 * i + 1] = dram_cluster->samples[i].sample_lo;
+ samples[2 * i + 0] = dram_cluster->samples[i].sample_hi;
+ }
+
+ /* Send data up to trigger point (if triggered). */
+ int trigger_offset = 0;
+ if ((int)i == triggerts) {
+ /*
+ * Trigger is not always accurate to sample because of
+ * pipeline delay. However, it always triggers before
+ * the actual event. We therefore look at the next
+ * samples to pinpoint the exact position of the trigger.
+ */
+ trigger_offset = get_trigger_offset(samples,
+ ss->lastsample, &devc->trigger);
+ if (trigger_offset > 0) {
packet.type = SR_DF_LOGIC;
- packet.payload = &logic;
- logic.length = tosend * sizeof(uint16_t);
- logic.unitsize = 2;
- logic.data = samples + sent;
+ logic.length = trigger_offset * logic.unitsize;
sr_session_send(devc->cb_data, &packet);
+ events_in_cluster -= trigger_offset;
+ }
- sent += tosend;
+ /* Only send trigger if explicitly enabled. */
+ if (devc->use_triggers) {
+ packet.type = SR_DF_TRIGGER;
+ sr_session_send(devc->cb_data, &packet);
}
- n = 0;
+ }
- event = (uint16_t *) &buf[i * 16 + 2];
- cur_sample = 0;
+ if (events_in_cluster > 0) {
+ packet.type = SR_DF_LOGIC;
+ logic.length = events_in_cluster * logic.unitsize;
+ logic.data = samples + (trigger_offset * logic.unitsize);
+ sr_session_send(devc->cb_data, &packet);
+ }
- /* For each event in cluster. */
- for (j = 0; j < 7; ++j) {
+ ss->lastsample =
+ samples[2 * (events_in_cluster - 1) + 0] |
+ (samples[2 * (events_in_cluster - 1) + 1] << 8);
- /* For each sample in event. */
- for (k = 0; k < devc->samples_per_event; ++k) {
- cur_sample = 0;
+}
- /* For each channel. */
- for (l = 0; l < devc->num_channels; ++l)
- cur_sample |= (!!(event[j] & (1 << (l *
- devc->samples_per_event + k)))) << l;
+/*
+ * Decode chunk of 1024 bytes, 64 clusters, 7 events per cluster.
+ * Each event is 20ns apart, and can contain multiple samples.
+ *
+ * For 200 MHz, events contain 4 samples for each channel, spread 5 ns apart.
+ * For 100 MHz, events contain 2 samples for each channel, spread 10 ns apart.
+ * For 50 MHz and below, events contain one sample for each channel,
+ * spread 20 ns apart.
+ */
+static int decode_chunk_ts(struct sigma_dram_line *dram_line, int triggerpos,
+ uint16_t events_in_line, void *cb_data)
+{
+ struct sigma_dram_cluster *dram_cluster;
+ struct sr_dev_inst *sdi = cb_data;
+ struct dev_context *devc = sdi->priv;
+ unsigned int clusters_in_line =
+ (events_in_line + (EVENTS_PER_CLUSTER - 1)) / EVENTS_PER_CLUSTER;
+ unsigned int events_in_cluster;
+ unsigned int i;
+ int triggerts = -1;
- samples[n++] = cur_sample;
- }
- }
+ /* Check if trigger is in this chunk. */
+ if (triggerpos != -1) {
+ if (devc->cur_samplerate <= SR_MHZ(50))
+ triggerpos -= EVENTS_PER_CLUSTER - 1;
- /* Send data up to trigger point (if triggered). */
- sent = 0;
- if (i == triggerts) {
- /*
- * Trigger is not always accurate to sample because of
- * pipeline delay. However, it always triggers before
- * the actual event. We therefore look at the next
- * samples to pinpoint the exact position of the trigger.
- */
- tosend = get_trigger_offset(samples, *lastsample,
- &devc->trigger);
-
- if (tosend > 0) {
- packet.type = SR_DF_LOGIC;
- packet.payload = &logic;
- logic.length = tosend * sizeof(uint16_t);
- logic.unitsize = 2;
- logic.data = samples;
- sr_session_send(devc->cb_data, &packet);
-
- sent += tosend;
- }
+ if (triggerpos < 0)
+ triggerpos = 0;
- /* Only send trigger if explicitly enabled. */
- if (devc->use_triggers) {
- packet.type = SR_DF_TRIGGER;
- sr_session_send(devc->cb_data, &packet);
- }
- }
+ /* Find in which cluster the trigger occured. */
+ triggerts = triggerpos / EVENTS_PER_CLUSTER;
+ }
- /* Send rest of the chunk to sigrok. */
- tosend = n - sent;
+ /* For each full DRAM cluster. */
+ for (i = 0; i < clusters_in_line; i++) {
+ dram_cluster = &dram_line->cluster[i];
- if (tosend > 0) {
- packet.type = SR_DF_LOGIC;
- packet.payload = &logic;
- logic.length = tosend * sizeof(uint16_t);
- logic.unitsize = 2;
- logic.data = samples + sent;
- sr_session_send(devc->cb_data, &packet);
+ /* The last cluster might not be full. */
+ if ((i == clusters_in_line - 1) &&
+ (events_in_line % EVENTS_PER_CLUSTER)) {
+ events_in_cluster = events_in_line % EVENTS_PER_CLUSTER;
+ } else {
+ events_in_cluster = EVENTS_PER_CLUSTER;
}
- *lastsample = samples[n - 1];
+ sigma_decode_dram_cluster(dram_cluster, events_in_cluster, sdi);
}
return SR_OK;
{
struct dev_context *devc = sdi->priv;
const int chunks_per_read = 32;
- unsigned char buf[chunks_per_read * CHUNK_SIZE];
- int bufsz, i, numchunks, newchunks;
+ struct sigma_dram_line *dram_line;
+ int bufsz;
uint32_t stoppos, triggerpos;
- int triggerchunk, chunks_downloaded;
struct sr_datafeed_packet packet;
uint8_t modestatus;
+ uint32_t i;
+ uint32_t dl_lines_total, dl_lines_curr, dl_lines_done;
+ uint32_t dl_events_in_line = 64 * 7;
+ uint32_t trg_line = ~0;
+
+ dram_line = g_try_malloc0(chunks_per_read * sizeof(*dram_line));
+ if (!dram_line)
+ return FALSE;
+
sr_info("Downloading sample data.");
/* Stop acquisition. */
/* Check if trigger has fired. */
modestatus = sigma_get_register(READ_MODE, devc);
if (modestatus & 0x20)
- triggerchunk = triggerpos / 512;
- else
- triggerchunk = -1;
-
- chunks_downloaded = 0;
- numchunks = (stoppos + 511) / 512;
- newchunks = MIN(chunks_per_read, numchunks - chunks_downloaded);
-
- bufsz = sigma_read_dram(chunks_downloaded, newchunks, buf, devc);
- /* TODO: Check bufsz. For now, just avoid compiler warnings. */
- (void)bufsz;
-
- /* Find first ts. */
- if (chunks_downloaded == 0) {
- devc->state.lastts = RL16(buf) - 1;
- devc->state.lastsample = 0;
- }
+ trg_line = triggerpos >> 9;
+
+ /*
+ * Determine how many 1024b "DRAM lines" do we need to read from the
+ * Sigma so we have a complete set of samples. Note that the last
+ * line can be only partial, containing less than 64 clusters.
+ */
+ dl_lines_total = (stoppos >> 9) + 1;
+
+ dl_lines_done = 0;
+
+ while (dl_lines_total > dl_lines_done) {
+ /* We can download only up-to 32 DRAM lines in one go! */
+ dl_lines_curr = MIN(chunks_per_read, dl_lines_total);
- /* Decode chunks and send them to sigrok. */
- for (i = 0; i < newchunks; ++i) {
- int limit_chunk = 0;
+ bufsz = sigma_read_dram(dl_lines_done, dl_lines_curr,
+ (uint8_t *)dram_line, devc);
+ /* TODO: Check bufsz. For now, just avoid compiler warnings. */
+ (void)bufsz;
- /* The last chunk may potentially be only in part. */
- if (chunks_downloaded == numchunks - 1) {
- /* Find the last valid timestamp */
- limit_chunk = stoppos % 512 + devc->state.lastts;
+ /* This is the first DRAM line, so find the initial timestamp. */
+ if (dl_lines_done == 0) {
+ devc->state.lastts =
+ sigma_dram_cluster_ts(&dram_line[0].cluster[0]);
+ devc->state.lastsample = 0;
}
- if (chunks_downloaded + i == triggerchunk)
- decode_chunk_ts(buf + (i * CHUNK_SIZE),
- &devc->state.lastts,
- &devc->state.lastsample,
- triggerpos & 0x1ff,
- limit_chunk, sdi);
- else
- decode_chunk_ts(buf + (i * CHUNK_SIZE),
- &devc->state.lastts,
- &devc->state.lastsample,
- -1, limit_chunk, sdi);
+ for (i = 0; i < dl_lines_curr; i++) {
+ int trigger_line = -1;
+ /* The last "DRAM line" can be only partially full. */
+ if (dl_lines_done + i == dl_lines_total - 1)
+ dl_events_in_line = stoppos & 0x1ff;
+
+ /* Test if the trigger happened on this line. */
+ if (dl_lines_done + i == trg_line)
+ trigger_line = trg_line;
- ++chunks_downloaded;
+ decode_chunk_ts(dram_line + i, trigger_line,
+ dl_events_in_line, sdi);
+ }
+
+ dl_lines_done += dl_lines_curr;
}
/* All done. */
dev_acquisition_stop(sdi, sdi);
+ g_free(dram_line);
+
return TRUE;
}
projects / libsigrok.git / blobdiff