From: Bartosz Golaszewski Date: Thu, 22 Jan 2015 09:22:59 +0000 (+0100) Subject: demo: implement averaging support X-Git-Tag: libsigrok-0.4.0~673 X-Git-Url: https://sigrok.org/gitaction?a=commitdiff_plain;h=7a8a1aba3797ed250f7b0e149ea4a6306be364b8;p=libsigrok.git demo: implement averaging support Add support for averaging and avg_samples option to the demo device. Signed-off-by: Bartosz Golaszewski --- diff --git a/src/hardware/demo/demo.c b/src/hardware/demo/demo.c index 26e49ca9..95c9fcfe 100644 --- a/src/hardware/demo/demo.c +++ b/src/hardware/demo/demo.c @@ -4,6 +4,7 @@ * Copyright (C) 2010 Uwe Hermann * Copyright (C) 2011 Olivier Fauchon * Copyright (C) 2012 Alexandru Gagniuc + * Copyright (C) 2015 Bartosz Golaszewski * * 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 @@ -103,6 +104,8 @@ struct analog_gen { float pattern_data[ANALOG_BUFSIZE]; unsigned int num_samples; struct sr_datafeed_analog packet; + float avg_val; /* Average value */ + unsigned num_avgs; /* Number of samples averaged */ }; /* Private, per-device-instance driver context. */ @@ -126,6 +129,8 @@ struct dev_context { /* Analog */ int32_t num_analog_channels; GHashTable *ch_ag; + gboolean avg; /* True if averaging is enabled */ + uint64_t avg_samples; }; static const uint32_t drvopts[] = { @@ -144,6 +149,8 @@ static const uint32_t devopts[] = { SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET, SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET, SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST, + SR_CONF_AVERAGING | SR_CONF_GET | SR_CONF_SET, + SR_CONF_AVG_SAMPLES | SR_CONF_GET | SR_CONF_SET, }; static const uint32_t devopts_cg_logic[] = { @@ -305,6 +312,8 @@ static GSList *scan(GSList *options) devc->logic_unitsize = (devc->num_logic_channels + 7) / 8; devc->logic_pattern = PATTERN_SIGROK; devc->num_analog_channels = num_analog_channels; + devc->avg = FALSE; + devc->avg_samples = 0; /* Logic channels, all in one channel group. */ cg = g_malloc0(sizeof(struct sr_channel_group)); @@ -347,6 +356,8 @@ static GSList *scan(GSList *options) ag->packet.unit = SR_UNIT_VOLT; ag->packet.data = ag->pattern_data; ag->pattern = pattern; + ag->avg_val = 0.0f; + ag->num_avgs = 0; g_hash_table_insert(devc->ch_ag, ch, ag); if (++pattern == ARRAY_SIZE(analog_pattern_str)) @@ -422,6 +433,12 @@ static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *s case SR_CONF_LIMIT_MSEC: *data = g_variant_new_uint64(devc->limit_msec); break; + case SR_CONF_AVERAGING: + *data = g_variant_new_boolean(devc->avg); + break; + case SR_CONF_AVG_SAMPLES: + *data = g_variant_new_uint64(devc->avg_samples); + break; case SR_CONF_PATTERN_MODE: if (!cg) return SR_ERR_CHANNEL_GROUP; @@ -486,6 +503,14 @@ static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sd devc->limit_samples = 0; sr_dbg("Setting time limit to %" PRIu64"ms", devc->limit_msec); break; + case SR_CONF_AVERAGING: + devc->avg = g_variant_get_boolean(data); + sr_dbg("%s averaging", devc->avg ? "Enabling" : "Disabling"); + break; + case SR_CONF_AVG_SAMPLES: + devc->avg_samples = g_variant_get_uint64(data); + sr_dbg("Setting averaging rate to %" PRIu64, devc->avg_samples); + break; case SR_CONF_PATTERN_MODE: if (!cg) return SR_ERR_CHANNEL_GROUP; @@ -662,6 +687,65 @@ static void logic_generator(struct sr_dev_inst *sdi, uint64_t size) } } +static void send_analog_packet(struct analog_gen *ag, + struct sr_dev_inst *sdi, + uint64_t *analog_sent, + uint64_t analog_todo) +{ + struct sr_datafeed_packet packet; + struct dev_context *devc; + uint64_t sending_now, to_avg; + int ag_pattern_pos; + unsigned int i; + + devc = sdi->priv; + packet.type = SR_DF_ANALOG; + packet.payload = &ag->packet; + + if (!devc->avg) { + ag_pattern_pos = devc->analog_counter % ag->num_samples; + sending_now = MIN(analog_todo, ag->num_samples-ag_pattern_pos); + ag->packet.data = ag->pattern_data + ag_pattern_pos; + ag->packet.num_samples = sending_now; + sr_session_send(sdi, &packet); + + /* Whichever channel group gets there first. */ + *analog_sent = MAX(*analog_sent, sending_now); + } else { + ag_pattern_pos = devc->analog_counter % ag->num_samples; + to_avg = MIN(analog_todo, ag->num_samples-ag_pattern_pos); + + for (i = 0; i < to_avg; i++) { + ag->avg_val = (ag->avg_val + + *(ag->pattern_data + + ag_pattern_pos + i)) / 2; + ag->num_avgs++; + /* Time to send averaged data? */ + if (devc->avg_samples > 0 && + ag->num_avgs >= devc->avg_samples) + goto do_send; + } + + if (devc->avg_samples == 0) { + /* We're averaging all the samples, so wait with + * sending until the very end. + */ + *analog_sent = ag->num_avgs; + return; + } + +do_send: + ag->packet.data = &ag->avg_val; + ag->packet.num_samples = 1; + + sr_session_send(sdi, &packet); + *analog_sent = ag->num_avgs; + + ag->num_avgs = 0; + ag->avg_val = 0.0f; + } +} + /* Callback handling data */ static int prepare_data(int fd, int revents, void *cb_data) { @@ -670,7 +754,6 @@ static int prepare_data(int fd, int revents, void *cb_data) struct sr_datafeed_packet packet; struct sr_datafeed_logic logic; struct analog_gen *ag; - int ag_pattern_pos; GHashTableIter iter; void *value; uint64_t logic_todo, analog_todo, expected_samplenum, analog_sent, sending_now; @@ -719,17 +802,8 @@ static int prepare_data(int fd, int revents, void *cb_data) g_hash_table_iter_init(&iter, devc->ch_ag); while (g_hash_table_iter_next(&iter, NULL, &value)) { - ag = value; - packet.type = SR_DF_ANALOG; - packet.payload = &ag->packet; - ag_pattern_pos = devc->analog_counter % ag->num_samples; - sending_now = MIN(analog_todo, ag->num_samples-ag_pattern_pos); - ag->packet.data = ag->pattern_data + ag_pattern_pos; - ag->packet.num_samples = sending_now; - sr_session_send(sdi, &packet); - - /* Whichever channel group gets there first. */ - analog_sent = MAX(analog_sent, sending_now); + send_analog_packet(value, sdi, + &analog_sent, analog_todo); } analog_todo -= analog_sent; devc->analog_counter += analog_sent; @@ -739,6 +813,19 @@ static int prepare_data(int fd, int revents, void *cb_data) if (!devc->continuous && (!devc->num_logic_channels || devc->logic_counter >= devc->limit_samples) && (!devc->num_analog_channels || devc->analog_counter >= devc->limit_samples)) { + /* If we're averaging everything - now is the time to send data */ + if (devc->avg_samples == 0) { + g_hash_table_iter_init(&iter, devc->ch_ag); + while (g_hash_table_iter_next(&iter, NULL, &value)) { + ag = value; + packet.type = SR_DF_ANALOG; + packet.payload = &ag->packet; + ag->packet.data = &ag->avg_val; + ag->packet.num_samples = 1; + sr_session_send(sdi, &packet); + } + } + sr_dbg("Requested number of samples reached."); dev_acquisition_stop(sdi, cb_data); return TRUE;