Implement MathSignal

[pulseview.git] / pv / data / signalbase.cpp

diff --git a/pv/data/signalbase.cpp b/pv/data/signalbase.cpp
index f49d95ebe8b0206f9f020dc0cba4bc7dd7ae1493..7d420ac7017902e8cffa80aee9be976f1fa75e67 100644 (file)
--- a/pv/data/signalbase.cpp
+++ b/pv/data/signalbase.cpp
@@ -118,6 +118,12 @@ shared_ptr<sigrok::Channel> SignalBase::channel() const
        return channel_;
 }
 
+bool SignalBase::is_generated() const
+{
+       // Only signals associated with a device have a corresponding sigrok channel
+       return channel_ == nullptr;
+}
+
 bool SignalBase::enabled() const
 {
        return (channel_) ? channel_->enabled() : true;
@@ -571,7 +577,8 @@ void SignalBase::convert_single_segment_range(AnalogSegment *asegment,
                uint8_t *lsamples = new uint8_t[ConversionBlockSize];
 
                vector<shared_ptr<sigrok::Channel> > channels;
-               channels.push_back(channel_);
+               if (channel_)
+                       channels.push_back(channel_);
 
                vector<const sigrok::QuantityFlag*> mq_flags;
                const sigrok::Quantity * const mq = sigrok::Quantity::VOLTAGE;