giuliomoro@19: /*
giuliomoro@19:  *
giuliomoro@19:  * First assignment for ECS732 RTDSP, to implement a 2-way audio crossover
giuliomoro@19:  * using the BeagleBone Black.
giuliomoro@19:  *
giuliomoro@19:  * Andrew McPherson and Victor Zappi
giuliomoro@19:  * Queen Mary, University of London
giuliomoro@19:  */
giuliomoro@19: 
giuliomoro@19: #include "../include/render.h"
giuliomoro@19: #include <cmath>
giuliomoro@19: #include <rtdk.h>
giuliomoro@19: 
giuliomoro@19: /* TASK: declare any global variables you need here */
giuliomoro@19: 
giuliomoro@19: // initialise_render() is called once before the audio rendering starts.
giuliomoro@19: // Use it to perform any initialisation and allocation which is dependent
giuliomoro@19: // on the period size or sample rate.
giuliomoro@19: //
giuliomoro@19: // userData holds an opaque pointer to a data structure that was passed
giuliomoro@19: // in from the call to initAudio().
giuliomoro@19: //
giuliomoro@19: // Return true on success; returning false halts the program.
giuliomoro@20: int gNumDigitalFrames=0;
giuliomoro@20: bool initialise_render(int numAnalogChannels, int numDigitalChannels, int numAudioChannels,
giuliomoro@20: 					   int numAnalogFramesPerPeriod,
giuliomoro@19: 					   int numAudioFramesPerPeriod,
giuliomoro@20: 					   float analogSampleRate, float audioSampleRate,
giuliomoro@19: 					   void *userData)
giuliomoro@19: {
giuliomoro@20: 	gNumAnalogChannels=numAnalogChannels;
giuliomoro@19: 	return true;
giuliomoro@19: }
giuliomoro@19: 
giuliomoro@19: // render() is called regularly at the highest priority by the audio engine.
giuliomoro@19: // Input and output are given from the audio hardware and the other
giuliomoro@20: // ADCs and DACs (if available). If only audio is available, numAnalogFrames
giuliomoro@19: // will be 0.
giuliomoro@19: 
giuliomoro@19: long int gCountFrames=0;
giuliomoro@20: void render(int numAnalogFrames, int numDigitalFrames, int numAudioFrames, float *audioIn, float *audioOut,
giuliomoro@20: 			float *analogIn, float *analogOut, uint32_t *digital)
giuliomoro@19: /*
giuliomoro@19:  * Hey, expect buffer underruns to happen here, as we are doing lots of printfs
giuliomoro@19:  * */
giuliomoro@19: {
giuliomoro@20: 	gNumDigitalFrames=numDigitalFrames;
giuliomoro@19: 	if(gCountFrames==0){ //this will be executed only on the first call to render(), but the bits will go through this cycle for every subsequent buffer
giuliomoro@19: 						// that is, P8_29 will pulse at the beginning of each buffer
giuliomoro@19: 	}
giuliomoro@20: 	for(int i=1; i<gNumDigitalFrames; i++)
giuliomoro@19: 		digitalWriteAll(i, GPIO_LOW); //write all channels on the given frame. Initialize them to zero
giuliomoro@19: 	digitalWrite(0, 4, GPIO_HIGH); // set pin 0 HIGH from the current frame to the end of the buffer
giuliomoro@20: 	for(int n=0; n<numAnalogFrames; n++) {
giuliomoro@20: 		for(int c=0; c<gNumAnalogChannels; c++)
giuliomoro@20: 			AnalogWriteFrame(c,n,0); //set channel c on frame n to 0, equivalent to analogOut[n*numAnalogChannels+c]=0;
giuliomoro@19: 	}
giuliomoro@20: 	AnalogWrite(0,3,0.2); //set channel 0 to 0.2 from frame 3 onwards ...
giuliomoro@20: 	AnalogWrite(1,3,0.7); //set channel 1 to 0.7 from frame 3 onwards ...
giuliomoro@20: 	AnalogWrite(2,6,0.5); //set channel 2 to 0.5 from frame 6 onwards ...
giuliomoro@19: 	for(int n=0; n<numAudioFrames; n++){
giuliomoro@20: 		printf("Digital frame %d: 0x%08x;\n",n,digital[n]);
giuliomoro@19: 	}
giuliomoro@20: 	for(int n=0; n<numAnalogFrames; n++){
giuliomoro@19: 		printf("Analog out frame %d :",n);
giuliomoro@20: 		for(int c=0; c<gNumAnalogChannels; c++)
giuliomoro@20: 			printf("%.1f ",analogOut[n*gNumAnalogChannels + c]);
giuliomoro@19: 		printf("\n");
giuliomoro@19: 	}
giuliomoro@19: }
giuliomoro@19: // cleanup_render() is called once at the end, after the audio has stopped.
giuliomoro@19: // Release any resources that were allocated in initialise_render().
giuliomoro@19: 
giuliomoro@19: void cleanup_render()
giuliomoro@19: {
giuliomoro@19: 	/* TASK:
giuliomoro@19: 	 * If you allocate any memory, be sure to release it here.
giuliomoro@19: 	 * You may or may not need anything in this function, depending
giuliomoro@19: 	 * on your implementation.
giuliomoro@19: 	 */
giuliomoro@19: }