comparison projects/scope/render.cpp @ 94:2fe6690fcab7

Added scope project, copied and edited from nodejsbeaglert

+#include <BeagleRT.h> 
+#include <Scope.h>
+#include <cmath>
+
+float gPhase1, gPhase2;
+float gFrequency1, gFrequency2;
+float gInverseSampleRate;
+
+Scope scope;    //create a scope object
+
+// initialise_render() is called once before the audio rendering starts.
+// Use it to perform any initialisation and allocation which is dependent
+// on the period size or sample rate.
+//
+// userData holds an opaque pointer to a data structure that was passed
+// in from the call to initAudio().
+//
+// Return true on success; returning false halts the program.
+bool setup(BeagleRTContext *context, void *userData)
+{
+	scope.setup(context->audioSampleRate);  //call this once in setup to initialise the scope
+	 
+	gInverseSampleRate = 1.0/context->audioSampleRate;
+	
+	gPhase1 = 0.0;
+	gPhase2 = 0.0;
+	
+	gFrequency1 = 200.0;
+	gFrequency2 = 201.0;
+	return true; 
+}
+
+// render() is called regularly at the highest priority by the audio engine.
+// Input and output are given from the audio hardware and the other
+// ADCs and DACs (if available). If only audio is available, numMatrixFrames
+// will be 0.
+
+void render(BeagleRTContext *context, void *userData)
+{
+	for(unsigned int n = 0; n < context->audioFrames; n++) {
+	    
+	    float chn1 = sinf(gPhase1);
+	    float chn2 = sinf(gPhase2);
+	    
+	    float chn3 = context->audioIn[n*2 + 0];
+	    float chn4 = context->audioIn[n*2 + 1];
+	    
+	    float chn5 = context->analogIn[(int)n/2*8 + 0];
+	    float chn6 = context->analogIn[(int)n/2*8 + 1];
+	    
+//	    scope.log(chn1, chn2, chn3, chn4, chn5, chn6);
+	    scope.log(chn1);
+	    //call this once every audio frame
+	    //takes six or fewer floats as parameters
+	    //first parameter becomes channel 1 etc
+	    //to view, click the 'oscilloscope' button on the toolbar while BeagleRT is NOT running
+	    //then click the big red button on the toolbar on this page
+	    
+	    gPhase1 += 2.0 * M_PI * gFrequency1 * gInverseSampleRate;
+	    gPhase2 += 2.0 * M_PI * gFrequency2 * gInverseSampleRate;
+		if(gPhase1 > 2.0 * M_PI)
+			gPhase1 -= 2.0 * M_PI;
+		if(gPhase2 > 2.0 * M_PI)
+			gPhase2 -= 2.0 * M_PI;
+		
+	}
+}
+
+// cleanup_render() is called once at the end, after the audio has stopped.
+// Release any resources that were allocated in initialise_render().
+
+void cleanup(BeagleRTContext *context, void *userData)
+{
+    
+}