giuliomoro@206: /*
giuliomoro@206:  * render.cpp
giuliomoro@206:  *
giuliomoro@206:  *  Created on: Oct 24, 2014
giuliomoro@206:  *      Author: parallels
giuliomoro@206:  */
giuliomoro@206: 
giuliomoro@206: #include <BeagleRT.h>
giuliomoro@206: #include <PulseIn.h>
giuliomoro@206: #include <Utilities.h>
giuliomoro@206: #include <stdlib.h>
giuliomoro@206: #include <rtdk.h>
giuliomoro@206: #include <cmath>
giuliomoro@206: 
giuliomoro@206: // setup() is called once before the audio rendering starts.
giuliomoro@206: // Use it to perform any initialisation and allocation which is dependent
giuliomoro@206: // on the period size or sample rate.
giuliomoro@206: //
giuliomoro@206: // userData holds an opaque pointer to a data structure that was passed
giuliomoro@206: // in from the call to initAudio().
giuliomoro@206: //
giuliomoro@206: // Return true on success; returning false halts the program.
giuliomoro@206: PulseIn pulseIn;
giuliomoro@206: int gPulseInPin = 0;
giuliomoro@206: int gDigitalOutPin = 1;
giuliomoro@206: int gPulseLength = 1234;
giuliomoro@206: int gSamplesBetweenPulses = 10000;
giuliomoro@206: 
giuliomoro@206: bool setup(BeagleRTContext *context, void *userData)
giuliomoro@206: {
giuliomoro@206: 	pinModeFrame(context, 0, gDigitalOutPin, OUTPUT);
giuliomoro@206: 	pulseIn.init(context, gPulseInPin, 1); //third parameter is direction
giuliomoro@206: 	return true;
giuliomoro@206: }
giuliomoro@206: 
giuliomoro@206: // render() is called regularly at the highest priority by the audio engine.
giuliomoro@206: // Input and output are given from the audio hardware and the other
giuliomoro@206: // ADCs and DACs (if available). If only audio is available, numMatrixFrames
giuliomoro@206: // will be 0.
giuliomoro@206: 
giuliomoro@206: void render(BeagleRTContext *context, void *userData)
giuliomoro@206: {
giuliomoro@206: 	static bool pulseOut = 0;
giuliomoro@206: 	static int count = 0;
giuliomoro@206: 	for(unsigned int n = 0; n < context->digitalFrames; n++){
giuliomoro@206: 		// detect if a pulse just ended
giuliomoro@206: 		int duration = pulseIn.hasPulsed(context, n);
giuliomoro@206: 		if(duration > 0){
giuliomoro@206: 			rt_printf("duration = %d\n", duration);
giuliomoro@206: 		}
giuliomoro@206: 
giuliomoro@206: 		// generate a rectangular waveform as a test signal.
giuliomoro@206: 		// Connect gDigitalOutPin to gPulseInPin
giuliomoro@206: 		// to verify that the detected pulse length is gPulseLength
giuliomoro@206: 		if(count == gPulseLength ){
giuliomoro@206: 			pulseOut = false;
giuliomoro@206: 		}
giuliomoro@206: 		if(count == (gPulseLength + gSamplesBetweenPulses)){
giuliomoro@206: 			pulseOut = true;
giuliomoro@206: 			count = 0;
giuliomoro@206: 		}
giuliomoro@206: 		digitalWriteFrame(context, n, gDigitalOutPin, pulseOut);
giuliomoro@206: 		count++;
giuliomoro@206: 	}
giuliomoro@206: }
giuliomoro@206: 
giuliomoro@206: // cleanup() is called once at the end, after the audio has stopped.
giuliomoro@206: // Release any resources that were allocated in setup().
giuliomoro@206: 
giuliomoro@206: void cleanup(BeagleRTContext *context, void *userData)
giuliomoro@206: {
giuliomoro@206: 
giuliomoro@206: }