From: Soeren Apel Date: Sun, 12 Feb 2017 17:29:47 +0000 (+0100) Subject: Implement autoranging for analog channels X-Git-Tag: pulseview-0.4.0~192 X-Git-Url: https://sigrok.org/gitaction?a=commitdiff_plain;h=73e377feaaf01e790c87a4a0c918a36e87a9a6b9;p=pulseview.git Implement autoranging for analog channels --- diff --git a/pv/data/analogsegment.cpp b/pv/data/analogsegment.cpp index d40c40f2..886bd4f5 100644 --- a/pv/data/analogsegment.cpp +++ b/pv/data/analogsegment.cpp @@ -45,7 +45,9 @@ const float AnalogSegment::LogEnvelopeScaleFactor = const uint64_t AnalogSegment::EnvelopeDataUnit = 64*1024; // bytes AnalogSegment::AnalogSegment(uint64_t samplerate) : - Segment(samplerate, sizeof(float)) + Segment(samplerate, sizeof(float)), + min_value_(0), + max_value_(0) { lock_guard lock(mutex_); memset(envelope_levels_, 0, sizeof(envelope_levels_)); @@ -88,6 +90,11 @@ const float* AnalogSegment::get_samples( return (float*)get_raw_samples(start_sample, (end_sample - start_sample)); } +const std::pair AnalogSegment::get_min_max() const +{ + return std::make_pair(min_value_, max_value_); +} + SegmentAnalogDataIterator* AnalogSegment::begin_sample_iteration(uint64_t start) const { return (SegmentAnalogDataIterator*)begin_raw_sample_iteration(start); @@ -170,6 +177,9 @@ void AnalogSegment::append_payload_to_envelope_levels() *max_element(samples, samples + EnvelopeScaleFactor), }; + if (sub_sample.min < min_value_) min_value_ = sub_sample.min; + if (sub_sample.max > max_value_) max_value_ = sub_sample.max; + continue_raw_sample_iteration(it, EnvelopeScaleFactor); *dest_ptr++ = sub_sample; } @@ -202,7 +212,7 @@ void AnalogSegment::append_payload_to_envelope_levels() EnvelopeSample sub_sample = *src_ptr++; while (src_ptr < end_src_ptr) { - sub_sample.min = min(sub_sample.min, src_ptr->min); + sub_sample.min = min(sub_sample.min, src_ptr->min);; sub_sample.max = max(sub_sample.max, src_ptr->max); src_ptr++; } diff --git a/pv/data/analogsegment.hpp b/pv/data/analogsegment.hpp index 52d37a76..09ae2c02 100644 --- a/pv/data/analogsegment.hpp +++ b/pv/data/analogsegment.hpp @@ -81,6 +81,8 @@ public: const float* get_samples(int64_t start_sample, int64_t end_sample) const; + const std::pair get_min_max() const; + SegmentAnalogDataIterator* begin_sample_iteration(uint64_t start) const; void continue_sample_iteration(SegmentAnalogDataIterator* it, uint64_t increase) const; void end_sample_iteration(SegmentAnalogDataIterator* it) const; @@ -96,6 +98,8 @@ private: private: struct Envelope envelope_levels_[ScaleStepCount]; + float min_value_, max_value_; + friend struct AnalogSegmentTest::Basic; }; diff --git a/pv/view/analogsignal.cpp b/pv/view/analogsignal.cpp index bf1f9017..07fb0ef8 100644 --- a/pv/view/analogsignal.cpp +++ b/pv/view/analogsignal.cpp @@ -25,6 +25,7 @@ #include #include +#include #include #include #include @@ -78,7 +79,8 @@ AnalogSignal::AnalogSignal( div_height_(3 * QFontMetrics(QApplication::font()).height()), pos_vdivs_(1), neg_vdivs_(1), - resolution_(0) + resolution_(0), + autoranging_(1) { base_->set_colour(SignalColours[base_->index() % countof(SignalColours)]); update_scale(); @@ -94,6 +96,7 @@ void AnalogSignal::save_settings(QSettings &settings) const settings.setValue("pos_vdivs", pos_vdivs_); settings.setValue("neg_vdivs", neg_vdivs_); settings.setValue("scale_index", scale_index_); + settings.setValue("autoranging", autoranging_); } void AnalogSignal::restore_settings(QSettings &settings) @@ -108,6 +111,9 @@ void AnalogSignal::restore_settings(QSettings &settings) scale_index_ = settings.value("scale_index").toInt(); update_scale(); } + + if (settings.contains("autoranging")) + autoranging_ = settings.value("autoranging").toBool(); } std::pair AnalogSignal::v_extents() const @@ -348,6 +354,53 @@ void AnalogSignal::update_scale() scale_ = div_height_ / resolution_; } +void AnalogSignal::perform_autoranging(bool force_update) +{ + const deque< shared_ptr > &segments = + base_->analog_data()->analog_segments(); + + if (segments.empty()) + return; + + static double prev_min = 0, prev_max = 0; + double min = 0, max = 0; + + for (shared_ptr segment : segments) { + std::pair mm = segment->get_min_max(); + min = std::min(min, mm.first); + max = std::max(max, mm.second); + } + + if ((min == prev_min) && (max == prev_max) && !force_update) + return; + + prev_min = min; + prev_max = max; + + // Use all divs for the positive range if there are no negative values + if ((min == 0) && (neg_vdivs_ > 0)) { + pos_vdivs_ += neg_vdivs_; + neg_vdivs_ = 0; + } + + double min_value_per_div; + if ((pos_vdivs_ > 0) && (neg_vdivs_ > 0)) + min_value_per_div = std::max(max / pos_vdivs_, -min / neg_vdivs_); + else if (pos_vdivs_ > 0) + min_value_per_div = max / pos_vdivs_; + else + min_value_per_div = -min / neg_vdivs_; + + // Find first scale value that is bigger than the value we need + for (int i = MinScaleIndex; i < MaxScaleIndex; i++) + if (get_resolution(i) > min_value_per_div) { + scale_index_ = i; + break; + } + + update_scale(); +} + void AnalogSignal::populate_popup_form(QWidget *parent, QFormLayout *form) { // Add the standard options @@ -391,6 +444,15 @@ void AnalogSignal::populate_popup_form(QWidget *parent, QFormLayout *form) layout->addRow(tr("Vertical resolution"), vdiv_layout); + // Add the autoranging checkbox + QCheckBox* autoranging_cb = new QCheckBox(); + autoranging_cb->setCheckState(autoranging_ ? Qt::Checked : Qt::Unchecked); + + connect(autoranging_cb, SIGNAL(stateChanged(int)), + this, SLOT(on_autoranging_changed(int))); + + layout->addRow(tr("Autoranging"), autoranging_cb); + form->addRow(layout); } @@ -398,6 +460,9 @@ void AnalogSignal::on_pos_vdivs_changed(int vdivs) { pos_vdivs_ = vdivs; + if (autoranging_) + perform_autoranging(true); + if (owner_) { // Call order is important, otherwise the lazy event handler won't work owner_->extents_changed(false, true); @@ -409,6 +474,9 @@ void AnalogSignal::on_neg_vdivs_changed(int vdivs) { neg_vdivs_ = vdivs; + if (autoranging_) + perform_autoranging(true); + if (owner_) { // Call order is important, otherwise the lazy event handler won't work owner_->extents_changed(false, true); @@ -425,6 +493,17 @@ void AnalogSignal::on_resolution_changed(int index) owner_->row_item_appearance_changed(false, true); } +void AnalogSignal::on_autoranging_changed(int state) +{ + autoranging_ = (state == Qt::Checked); + + if (autoranging_) + perform_autoranging(true); + + if (owner_) + owner_->row_item_appearance_changed(false, true); +} + } // namespace TraceView } // namespace views } // namespace pv diff --git a/pv/view/analogsignal.hpp b/pv/view/analogsignal.hpp index 7f0a2568..5223338c 100644 --- a/pv/view/analogsignal.hpp +++ b/pv/view/analogsignal.hpp @@ -126,6 +126,8 @@ private: void update_scale(); + void perform_autoranging(bool force_update = false); + protected: void populate_popup_form(QWidget *parent, QFormLayout *form); @@ -135,6 +137,8 @@ private Q_SLOTS: void on_resolution_changed(int index); + void on_autoranging_changed(int state); + private: QComboBox *resolution_cb_; @@ -145,6 +149,8 @@ private: int div_height_; int pos_vdivs_, neg_vdivs_; // divs per positive/negative side float resolution_; // e.g. 10 for 10 V/div + + bool autoranging_; }; } // namespace TraceView