X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=src%2Fhardware%2Fasix-sigma%2Fprotocol.c;fp=src%2Fhardware%2Fasix-sigma%2Fprotocol.c;h=8491d7431af8213616506634cba4f0fed159d2c3;hb=66d1790cc0731d61f97dd11dad3ab7e2d7e799e3;hp=ce6974c6ec38a767f6e61bd9766ddbd2ca5837ee;hpb=16a5d5ac7d0390b03278d2a65554d395337eaf45;p=libsigrok.git diff --git a/src/hardware/asix-sigma/protocol.c b/src/hardware/asix-sigma/protocol.c index ce6974c6..8491d743 100644 --- a/src/hardware/asix-sigma/protocol.c +++ b/src/hardware/asix-sigma/protocol.c @@ -1290,6 +1290,92 @@ static void sigma_location_break_down(struct sigma_location *loc) loc->cluster = loc->cluster / EVENTS_PER_CLUSTER; } +static gboolean sigma_location_is_eq(struct sigma_location *loc1, + struct sigma_location *loc2, gboolean with_event) +{ + + if (!loc1 || !loc2) + return FALSE; + + if (loc1->line != loc2->line) + return FALSE; + if (loc1->cluster != loc2->cluster) + return FALSE; + + if (with_event && loc1->event != loc2->event) + return FALSE; + + return TRUE; +} + +/* Decrement the broken-down location fields (leave 'raw' as is). */ +static void sigma_location_decrement(struct sigma_location *loc, + gboolean with_event) +{ + + if (!loc) + return; + + if (with_event) { + if (loc->event--) + return; + loc->event = EVENTS_PER_CLUSTER - 1; + } + + if (loc->cluster--) + return; + loc->cluster = CLUSTERS_PER_ROW - 1; + + if (loc->line--) + return; + loc->line = ROW_COUNT - 1; +} + +static void sigma_location_increment(struct sigma_location *loc) +{ + + if (!loc) + return; + + if (++loc->event < EVENTS_PER_CLUSTER) + return; + loc->event = 0; + if (++loc->cluster < CLUSTERS_PER_ROW) + return; + loc->cluster = 0; + if (++loc->line < ROW_COUNT) + return; + loc->line = 0; +} + +/* + * Determine the position where to open the period of trigger match + * checks. Setup an "impossible" location when triggers are not used. + * Start from the hardware provided 'trig' position otherwise, and + * go back a few clusters, but don't go before the 'start' position. + */ +static void rewind_trig_arm_pos(struct dev_context *devc, size_t count) +{ + struct sigma_sample_interp *interp; + + if (!devc) + return; + interp = &devc->interp; + + if (!devc->use_triggers) { + interp->trig_arm.raw = ~0; + sigma_location_break_down(&interp->trig_arm); + return; + } + + interp->trig_arm = interp->trig; + while (count--) { + if (sigma_location_is_eq(&interp->trig_arm, &interp->start, TRUE)) + break; + sigma_location_decrement(&interp->trig_arm, TRUE); + } +} + static int alloc_sample_buffer(struct dev_context *devc, size_t stop_pos, size_t trig_pos, uint8_t mode) { @@ -1329,6 +1415,15 @@ static int alloc_sample_buffer(struct dev_context *devc, sigma_location_break_down(&interp->trig); sigma_location_break_down(&interp->iter); + /* + * The hardware provided trigger location "is late" because of + * latency in hardware pipelines. It points to after the trigger + * condition match. Arrange for a software check of sample data + * matches starting just a little before the hardware provided + * location. The "4 clusters" distance is an arbitrary choice. + */ + rewind_trig_arm_pos(devc, 4 * EVENTS_PER_CLUSTER); + /* Determine which DRAM lines to fetch from the device. */ memset(&interp->fetch, 0, sizeof(interp->fetch)); interp->fetch.lines_total = interp->stop.line + 1; @@ -1547,21 +1642,36 @@ static gboolean sample_matches_trigger(struct dev_context *devc, uint16_t sample return FALSE; } +static int send_trigger_marker(struct dev_context *devc) +{ + int ret; + + ret = flush_submit_buffer(devc); + if (ret != SR_OK) + return ret; + ret = std_session_send_df_trigger(devc->buffer->sdi); + if (ret != SR_OK) + return ret; + + return SR_OK; +} + static int check_and_submit_sample(struct dev_context *devc, uint16_t sample, size_t count, gboolean check_trigger) { gboolean triggered; int ret; + /* + * Ignore the condition provided by the "inner loop" logic of + * sample memory iteration. Instead use device context status + * for the period with software trigger match checks. + */ + check_trigger = devc->interp.trig_chk.armed; + triggered = check_trigger && sample_matches_trigger(devc, sample); - if (triggered) { - ret = flush_submit_buffer(devc); - if (ret != SR_OK) - return ret; - ret = std_session_send_df_trigger(devc->buffer->sdi); - if (ret != SR_OK) - return ret; - } + if (triggered) + send_trigger_marker(devc); ret = addto_submit_buffer(devc, sample, count); if (ret != SR_OK) @@ -1570,6 +1680,46 @@ static int check_and_submit_sample(struct dev_context *devc, return SR_OK; } +static void sigma_location_check(struct dev_context *devc) +{ + struct sigma_sample_interp *interp; + + if (!devc) + return; + interp = &devc->interp; + + /* + * Manage the period of trigger match checks in software. + * Start supervision somewhere before the hardware provided + * location. Stop supervision after an arbitrary amount of + * event slots, or when a match was found. + */ + if (interp->trig_chk.armed) { + interp->trig_chk.evt_remain--; + if (!interp->trig_chk.evt_remain || interp->trig_chk.matched) + interp->trig_chk.armed = FALSE; + } + if (!interp->trig_chk.armed && !interp->trig_chk.matched) { + if (sigma_location_is_eq(&interp->iter, &interp->trig_arm, TRUE)) { + interp->trig_chk.armed = TRUE; + interp->trig_chk.matched = FALSE; + interp->trig_chk.evt_remain = 8 * EVENTS_PER_CLUSTER; + } + } + + /* + * Force a trigger marker when the software check found no match + * yet while the hardware provided position was reached. This + * very probably is a user initiated button press. + */ + if (interp->trig_chk.armed) { + if (sigma_location_is_eq(&interp->iter, &interp->trig, TRUE)) { + (void)send_trigger_marker(devc); + interp->trig_chk.matched = TRUE; + } + } +} + /* * Return the timestamp of "DRAM cluster". */ @@ -1669,23 +1819,31 @@ static void sigma_decode_dram_cluster(struct dev_context *devc, if (devc->interp.samples_per_event == 4) { sample = sigma_deinterlace_data_4x4(item16, 0); check_and_submit_sample(devc, sample, 1, triggered); + devc->interp.last.sample = sample; sample = sigma_deinterlace_data_4x4(item16, 1); check_and_submit_sample(devc, sample, 1, triggered); + devc->interp.last.sample = sample; sample = sigma_deinterlace_data_4x4(item16, 2); check_and_submit_sample(devc, sample, 1, triggered); + devc->interp.last.sample = sample; sample = sigma_deinterlace_data_4x4(item16, 3); check_and_submit_sample(devc, sample, 1, triggered); + devc->interp.last.sample = sample; } else if (devc->interp.samples_per_event == 2) { sample = sigma_deinterlace_data_2x8(item16, 0); check_and_submit_sample(devc, sample, 1, triggered); + devc->interp.last.sample = sample; sample = sigma_deinterlace_data_2x8(item16, 1); check_and_submit_sample(devc, sample, 1, triggered); + devc->interp.last.sample = sample; } else { sample = item16; check_and_submit_sample(devc, sample, 1, triggered); + devc->interp.last.sample = sample; } + sigma_location_increment(&devc->interp.iter); + sigma_location_check(devc); } - devc->interp.last.sample = sample; } /* @@ -1831,8 +1989,6 @@ static int download_capture(struct sr_dev_inst *sdi) dl_events_in_line, trigger_event); interp->fetch.curr_line++; interp->fetch.lines_done++; - interp->iter.line++; - interp->iter.line %= ROW_COUNT; } } flush_submit_buffer(devc);