giuliomoro@18: /*
giuliomoro@18:  *
giuliomoro@18:  * First assignment for ECS732 RTDSP, to implement a 2-way audio crossover
giuliomoro@18:  * using the BeagleBone Black.
giuliomoro@18:  *
giuliomoro@18:  * Andrew McPherson and Victor Zappi
giuliomoro@18:  * Queen Mary, University of London
giuliomoro@18:  */
giuliomoro@18: 
giuliomoro@18: #include "../include/render.h"
giuliomoro@18: #include <cmath>
giuliomoro@18: #include <rtdk.h>
giuliomoro@18: 
giuliomoro@18: /* TASK: declare any global variables you need here */
giuliomoro@18: 
giuliomoro@18: // initialise_render() is called once before the audio rendering starts.
giuliomoro@18: // Use it to perform any initialisation and allocation which is dependent
giuliomoro@18: // on the period size or sample rate.
giuliomoro@18: //
giuliomoro@18: // userData holds an opaque pointer to a data structure that was passed
giuliomoro@18: // in from the call to initAudio().
giuliomoro@18: //
giuliomoro@18: // Return true on success; returning false halts the program.
giuliomoro@18: int gNumMatrixGpioFrames=0;
giuliomoro@18: bool initialise_render(int numMatrixChannels, int numMatrixGpioChannels, int numAudioChannels,
giuliomoro@18: 					   int numMatrixFramesPerPeriod,
giuliomoro@18: 					   int numAudioFramesPerPeriod,
giuliomoro@18: 					   float matrixSampleRate, float audioSampleRate,
giuliomoro@18: 					   void *userData)
giuliomoro@18: {
giuliomoro@18: 	gNumMatrixChannels=numMatrixChannels;
giuliomoro@18: 	return true;
giuliomoro@18: }
giuliomoro@18: 
giuliomoro@18: // render() is called regularly at the highest priority by the audio engine.
giuliomoro@18: // Input and output are given from the audio hardware and the other
giuliomoro@18: // ADCs and DACs (if available). If only audio is available, numMatrixFrames
giuliomoro@18: // will be 0.
giuliomoro@18: 
giuliomoro@18: long int gCountFrames=0;
giuliomoro@18: void render(int numMatrixFrames, int numMatrixGpioFrames, int numAudioFrames, float *audioIn, float *audioOut,
giuliomoro@18: 			float *matrixIn, float *matrixOut, uint32_t *matrixGpio)
giuliomoro@18: /*
giuliomoro@18:  * Hey, expect buffer underruns to happen here, as we are doing lots of printfs
giuliomoro@18:  * */
giuliomoro@18: {
giuliomoro@18: 	gNumMatrixGpioFrames=numMatrixGpioFrames;
giuliomoro@18: 	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@18: 						// that is, P8_29 will pulse at the beginning of each buffer
giuliomoro@18: 	}
giuliomoro@18: 	for(int i=1; i<gNumMatrixGpioFrames; i++)
giuliomoro@18: 		digitalWriteAll(i, GPIO_LOW); //write all channels on the given frame. Initialize them to zero
giuliomoro@18: 	digitalWrite(0, 4, GPIO_HIGH); // set pin 0 HIGH from the current frame to the end of the buffer
giuliomoro@18: 	for(int n=0; n<numMatrixFrames; n++) {
giuliomoro@18: 		for(int c=0; c<gNumMatrixChannels; c++)
giuliomoro@18: 			analogWriteFrame(c,n,0); //set channel c on frame n to 0, equivalent to matrixOut[n*numMatrixChannels+c]=0;
giuliomoro@18: 	}
giuliomoro@18: 	analogWrite(0,3,0.2); //set channel 0 to 0.2 from frame 3 onwards ...
giuliomoro@18: 	analogWrite(1,3,0.7); //set channel 1 to 0.7 from frame 3 onwards ...
giuliomoro@18: 	analogWrite(2,6,0.5); //set channel 2 to 0.5 from frame 6 onwards ...
giuliomoro@18: 	for(int n=0; n<numAudioFrames; n++){
giuliomoro@18: 		printf("Digital frame %d: 0x%08x;\n",n,matrixGpio[n]);
giuliomoro@18: 	}
giuliomoro@18: 	for(int n=0; n<numMatrixFrames; n++){
giuliomoro@18: 		printf("Analog out frame %d :",n);
giuliomoro@18: 		for(int c=0; c<gNumMatrixChannels; c++)
giuliomoro@18: 			printf("%.1f ",matrixOut[n*gNumMatrixChannels + c]);
giuliomoro@18: 		printf("\n");
giuliomoro@18: 	}
giuliomoro@18: }
giuliomoro@18: // cleanup_render() is called once at the end, after the audio has stopped.
giuliomoro@18: // Release any resources that were allocated in initialise_render().
giuliomoro@18: 
giuliomoro@18: void cleanup_render()
giuliomoro@18: {
giuliomoro@18: 	/* TASK:
giuliomoro@18: 	 * If you allocate any memory, be sure to release it here.
giuliomoro@18: 	 * You may or may not need anything in this function, depending
giuliomoro@18: 	 * on your implementation.
giuliomoro@18: 	 */
giuliomoro@18: }