giuliomoro@74:     /*
giuliomoro@74:  *
giuliomoro@74:  * Andrew McPherson and Victor Zappi
giuliomoro@74:  * Queen Mary, University of London
giuliomoro@74:  */
giuliomoro@74: 
giuliomoro@74: #include <BeagleRT.h>
giuliomoro@74: #include <Utilities.h>
giuliomoro@74: #include <cmath>
giuliomoro@74: #include <rtdk.h>
giuliomoro@74: 
giuliomoro@74: // setup() is called once before the audio rendering starts.
giuliomoro@74: // Use it to perform any initialisation and allocation which is dependent
giuliomoro@74: // on the period size or sample rate.
giuliomoro@74: //
giuliomoro@74: // userData holds an opaque pointer to a data structure that was passed
giuliomoro@74: // in from the call to initAudio().
giuliomoro@74: //
giuliomoro@74: // Return true on success; returning false halts the program.
giuliomoro@74: 
giuliomoro@74: bool setup(BeagleRTContext *context, void *userData)
giuliomoro@74: {
giuliomoro@74: 	return true;
giuliomoro@74: }
giuliomoro@74: 
giuliomoro@74: // render() is called regularly at the highest priority by the audio engine.
giuliomoro@74: // Input and output are given from the audio hardware and the other
giuliomoro@74: // ADCs and DACs (if available). If only audio is available, numAnalogFrames
giuliomoro@74: // will be 0.
giuliomoro@74: 
giuliomoro@74: void render(BeagleRTContext *context, void *userData)
giuliomoro@74: {
giuliomoro@74:   //connect an LED in series with a 470ohm resistor between P8_07 and ground
giuliomoro@74:   static int count=0; //counts elapsed samples
giuliomoro@74:   float interval=0.5; //how often to toggle the LED (in seconds)
giuliomoro@74:   static int status=GPIO_LOW;
giuliomoro@74: 	for(unsigned int n=0; n<context->digitalFrames; n++){
giuliomoro@74:     if(count==context->digitalSampleRate*interval){ //if enough samples have elapsed
giuliomoro@74:       count=0; //reset the counter
giuliomoro@74:     // status=digitalReadFrame(context, 0, P8_07);
giuliomoro@74:       if(status==GPIO_LOW) //toggle the status
giuliomoro@74:         status=GPIO_HIGH;
giuliomoro@74:       else
giuliomoro@74:         status=GPIO_LOW;
giuliomoro@74:       pinModeFrame(context, 0, P8_07, OUTPUT);
giuliomoro@74:       digitalWriteFrame(context, n, P8_07, status); //write the status to the LED
giuliomoro@74:     // rt_printf("there %d\n", context->digital[n]);
giuliomoro@74:     }
giuliomoro@74:     context->digital[n]=status*0x00010000;
giuliomoro@74:     count++;
giuliomoro@74:   }
giuliomoro@74: }
giuliomoro@74: 
giuliomoro@74: // cleanup() is called once at the end, after the audio has stopped.
giuliomoro@74: // Release any resources that were allocated in setup().
giuliomoro@74: 
giuliomoro@74: void cleanup(BeagleRTContext *context, void *userData)
giuliomoro@74: {
giuliomoro@74: 	// Nothing to do here
giuliomoro@74: }