giuliomoro@23:     /*
giuliomoro@19:  *
giuliomoro@19:  * Andrew McPherson and Victor Zappi
giuliomoro@19:  * Queen Mary, University of London
giuliomoro@19:  */
giuliomoro@19: 
giuliomoro@301: #include <Bela.h>
andrewm@56: #include <Utilities.h>
giuliomoro@19: #include <cmath>
giuliomoro@19: #include <rtdk.h>
giuliomoro@19: 
andrewm@56: // setup() 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.
andrewm@52: 
giuliomoro@301: bool setup(BelaContext *context, void *userData)
giuliomoro@19: {
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@301: void render(BelaContext *context, void *userData)
giuliomoro@19: /*
giuliomoro@23: we assume that gNumAnalogChannels=8, numAnalogFrames==8 and  numDigitalFrames==numAudioFrames
giuliomoro@19:  * */
giuliomoro@19: {
giuliomoro@87:   /*
giuliomoro@87:   * TODO: as an exercise, you will need to set the pin mode before writing or reading the digital pins.
giuliomoro@87:   */
andrewm@52: 	if((context->audioSampleCount&31)==0){ //every 32 frames...
giuliomoro@23:         //ANALOG channels
andrewm@308: 		analogWrite(context, 0, 0, analogRead(context, 0,0));
andrewm@52: 		// read the input0 at frame0  and write it to output0 frame0. Using analogWrite will fill the rest of the buffer with the same value
giuliomoro@23:                                             // The value at the last frame will persist through the successive buffers until is set again.
giuliomoro@23:                                             // This effectively is a pass-through with downsampling by 32 times
andrewm@308:         analogWrite(context, 0, 3, 1.0);  // write 1.0 to channel3 from frame0 to the end of the buffer
andrewm@308:         analogWrite(context, 4, 3, 0.1);  // write 0.1  to channel3 from frame4 to the end of the buffer
andrewm@308:         analogWriteOnce(context, 6, 3, 0.2); //write 0.2 to channel3 only on frame 6
giuliomoro@23:         //this buffer for channel 3 will look like this:  1 1 1 1 0.1 0.1 0.2 0.1 
giuliomoro@23:         //the next buffers for channel 3 will be filled up with 0.1 ....
giuliomoro@23:         //DIGITAL channels
andrewm@308:         digitalWrite(context, 0, P8_07, GPIO_HIGH); //sets all the frames  to HIGH for channel 0
andrewm@308:         digitalWriteOnce(context, 4, P8_07, GPIO_LOW); //only frame 4 will be LOW  for channel 0
giuliomoro@23:         // in this buffer the frames of channel 0 will look like this: 1 1 1 1 0 1 1 1 ...... 1 
giuliomoro@23:         // in the next buffer each frame of channel 0 will be initialized to 1 (the last value of this buffer)
andrewm@308:         digitalWrite(context, 0, P8_08, GPIO_HIGH);
andrewm@308:         digitalWrite(context, 2, P8_08, GPIO_LOW);
andrewm@308:         digitalWrite(context, 4, P8_08, GPIO_HIGH);
andrewm@308:         digitalWrite(context, 5, P8_08, GPIO_LOW);
andrewm@310:         pinMode(context, 0, P9_16, GPIO_INPUT); // set channel 10 to input
giuliomoro@23:         // in this buffer the frames of channel 1 will look like this: 1 1 0 0 1 0 0 0 .... 0
giuliomoro@23:         // in the next buffer each frame of channel 1 will be initialized to 0 (the last value of this buffer)
giuliomoro@19: 	}
andrewm@52: 	for(unsigned int n=0; n<context->audioFrames; n++){
andrewm@52: 		for(unsigned int c=0; c<context->audioChannels; c++){
andrewm@52: 			context->audioOut[n*context->audioChannels + c]=context->audioIn[n*context->audioChannels + c];
giuliomoro@23: 		}
giuliomoro@33:         //use digital channels 2-8 to create a 7 bit binary counter
andrewm@52:         context->digital[n]=context->digital[n] & (~0b111111100); // set to zero (GPIO_OUTPUT) the bits in the lower word
andrewm@52:         context->digital[n]=context->digital[n] & ((~0b111111100<<16) | 0xffff ); //initialize to zero the bits in the higher word (output value)
andrewm@52:         context->digital[n]=context->digital[n] | ( ((context->audioSampleCount&0b1111111)<<(16+2)) ) ;  // set the bits in the higher word to the desired output value, keeping the lower word unchanged
andrewm@308:         digitalWrite(context, n, P8_29, digitalRead(context, n, P8_30)); // echo the input from from channel 15 to channel 14
andrewm@308:         digitalWrite(context, n, P8_28, digitalRead(context, n, P9_16)); // echo the input from from channel 10 to channel 13
andrewm@310:         pinMode(context, 0, P8_30, 0); //set channel 15 to input
giuliomoro@19: 	}
giuliomoro@23: 
andrewm@52: 	for(unsigned int n=0; n<context->analogFrames; n++){
andrewm@308:     	analogWrite(context, n, 1, (context->audioSampleCount&8191)/8192.0); // writes a single frame. channel 1 is a ramp that follows gCountFrames
andrewm@308:     	analogWrite(context, n, 2, analogRead(context, n, 2)); // writes a single frame. channel2 is just a passthrough
giuliomoro@23: //		rt_printf("Analog out frame %d :",n);
giuliomoro@23: //		for(int c=0; c<gNumAnalogChannels; c++)
giuliomoro@23: //			rt_printf("%.1f ",analogOut[n*gNumAnalogChannels + c]);
giuliomoro@23: //		rt_printf("\n");
giuliomoro@19: 	}
giuliomoro@23: 	return;
giuliomoro@23: 
giuliomoro@19: }
giuliomoro@19: 
andrewm@56: // cleanup() is called once at the end, after the audio has stopped.
andrewm@56: // Release any resources that were allocated in setup().
andrewm@56: 
giuliomoro@301: void cleanup(BelaContext *context, void *userData)
giuliomoro@19: {
andrewm@56: 	// Nothing to do here
giuliomoro@19: }