giuliomoro@94: #include <BeagleRT.h> 
giuliomoro@94: #include <Scope.h>
giuliomoro@94: #include <cmath>
giuliomoro@94: 
giuliomoro@94: float gPhase1, gPhase2;
giuliomoro@94: float gFrequency1, gFrequency2;
giuliomoro@94: float gInverseSampleRate;
giuliomoro@94: 
giuliomoro@94: Scope scope;    //create a scope object
giuliomoro@94: 
giuliomoro@94: // initialise_render() is called once before the audio rendering starts.
giuliomoro@94: // Use it to perform any initialisation and allocation which is dependent
giuliomoro@94: // on the period size or sample rate.
giuliomoro@94: //
giuliomoro@94: // userData holds an opaque pointer to a data structure that was passed
giuliomoro@94: // in from the call to initAudio().
giuliomoro@94: //
giuliomoro@94: // Return true on success; returning false halts the program.
giuliomoro@94: bool setup(BeagleRTContext *context, void *userData)
giuliomoro@94: {
giuliomoro@94: 	scope.setup(context->audioSampleRate);  //call this once in setup to initialise the scope
giuliomoro@94: 	 
giuliomoro@94: 	gInverseSampleRate = 1.0/context->audioSampleRate;
giuliomoro@94: 	
giuliomoro@94: 	gPhase1 = 0.0;
giuliomoro@94: 	gPhase2 = 0.0;
giuliomoro@94: 	
giuliomoro@94: 	gFrequency1 = 200.0;
giuliomoro@94: 	gFrequency2 = 201.0;
giuliomoro@94: 	return true; 
giuliomoro@94: }
giuliomoro@94: 
giuliomoro@94: // render() is called regularly at the highest priority by the audio engine.
giuliomoro@94: // Input and output are given from the audio hardware and the other
giuliomoro@94: // ADCs and DACs (if available). If only audio is available, numMatrixFrames
giuliomoro@94: // will be 0.
giuliomoro@94: 
giuliomoro@94: void render(BeagleRTContext *context, void *userData)
giuliomoro@94: {
giuliomoro@94: 	for(unsigned int n = 0; n < context->audioFrames; n++) {
giuliomoro@94: 	    
giuliomoro@94: 	    float chn1 = sinf(gPhase1);
giuliomoro@94: 	    float chn2 = sinf(gPhase2);
giuliomoro@94: 	    
giuliomoro@94: 	    float chn3 = context->audioIn[n*2 + 0];
giuliomoro@94: 	    float chn4 = context->audioIn[n*2 + 1];
giuliomoro@94: 	    
giuliomoro@94: 	    float chn5 = context->analogIn[(int)n/2*8 + 0];
giuliomoro@94: 	    float chn6 = context->analogIn[(int)n/2*8 + 1];
giuliomoro@94: 	    
giuliomoro@94: //	    scope.log(chn1, chn2, chn3, chn4, chn5, chn6);
giuliomoro@94: 	    scope.log(chn1);
giuliomoro@94: 	    //call this once every audio frame
giuliomoro@94: 	    //takes six or fewer floats as parameters
giuliomoro@94: 	    //first parameter becomes channel 1 etc
giuliomoro@94: 	    //to view, click the 'oscilloscope' button on the toolbar while BeagleRT is NOT running
giuliomoro@94: 	    //then click the big red button on the toolbar on this page
giuliomoro@94: 	    
giuliomoro@94: 	    gPhase1 += 2.0 * M_PI * gFrequency1 * gInverseSampleRate;
giuliomoro@94: 	    gPhase2 += 2.0 * M_PI * gFrequency2 * gInverseSampleRate;
giuliomoro@94: 		if(gPhase1 > 2.0 * M_PI)
giuliomoro@94: 			gPhase1 -= 2.0 * M_PI;
giuliomoro@94: 		if(gPhase2 > 2.0 * M_PI)
giuliomoro@94: 			gPhase2 -= 2.0 * M_PI;
giuliomoro@94: 		
giuliomoro@94: 	}
giuliomoro@94: }
giuliomoro@94: 
giuliomoro@94: // cleanup_render() is called once at the end, after the audio has stopped.
giuliomoro@94: // Release any resources that were allocated in initialise_render().
giuliomoro@94: 
giuliomoro@94: void cleanup(BeagleRTContext *context, void *userData)
giuliomoro@94: {
giuliomoro@94:     
giuliomoro@94: }