andrewm@268: /*
andrewm@268:  * render.cpp
andrewm@268:  *
andrewm@268:  *  Created on: Oct 24, 2014
andrewm@268:  *      Author: parallels
andrewm@268:  */
andrewm@268: 
andrewm@268: 
giuliomoro@301: #include <Bela.h>
andrewm@268: #include <Utilities.h>
andrewm@268: 
andrewm@268: #define NUM_PINS 12
andrewm@268: 
andrewm@268: // Breadboard wiring layout:
andrewm@268: // 11 10 12 9  8  7
andrewm@268: // [ LED DISP ]
andrewm@268: // 1  2  3  6  4  5
andrewm@268: 
andrewm@268: // Organised by display segments:
andrewm@268: // e d . X c g b X X X f a
andrewm@268: const int kPins[NUM_PINS] = {P8_07, P8_08, P8_09, P8_10, P8_11, P8_12,
andrewm@268: 							 P8_15, P8_16, P8_27, P8_28, P8_29, P8_30};
andrewm@268: 
andrewm@268: // Indices into the above array: pins 12, 9, 8, 6
andrewm@268: const int kDigits[4] = {9, 8, 7, 3};
andrewm@268: 
andrewm@268: int gCurrentlyDisplayingDigit = 0;
andrewm@268: int gDigitDisplayTime = 0;
andrewm@268: const int kDigitMaxDisplayTime = 44;
andrewm@268: 
andrewm@268: int gState = 0;
andrewm@268: int gStateCounter = 0;
andrewm@268: const int kMaxState = 25;
andrewm@268: 
andrewm@268: // . g f e d c b a
andrewm@268: //const unsigned char kBELA[4] = {0x7C, 0x79, 0x38, 0x77};
andrewm@268: const unsigned char kBELA[4] = {0x7C, 0x7B, 0x38, 0x5F};
andrewm@268: const unsigned char kPerimeter[6] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20};
andrewm@268: 
andrewm@268: int gCharacterToDisplay[4] = {0, 0, 0, 0};
andrewm@268: 	
andrewm@268: // setup() is called once before the audio rendering starts.
andrewm@268: // Use it to perform any initialisation and allocation which is dependent
andrewm@268: // on the period size or sample rate.
andrewm@268: //
andrewm@268: // userData holds an opaque pointer to a data structure that was passed
andrewm@268: // in from the call to initAudio().
andrewm@268: //
andrewm@268: // Return true on success; returning false halts the program.
andrewm@268: 
giuliomoro@301: bool setup(BelaContext *context, void *userData)
andrewm@268: {	
andrewm@268: 	// This project makes the assumption that the audio and digital
andrewm@268: 	// sample rates are the same. But check it to be sure!
andrewm@268: 	if(context->audioFrames != context->digitalFrames) {
andrewm@268: 		rt_printf("Error: this project needs the audio and digital sample rates to be the same.\n");
andrewm@268: 		return false;
andrewm@268: 	}
andrewm@268: 	
andrewm@268: 	for(int i = 0; i < NUM_PINS; i++) {
andrewm@310: 		pinMode(context, 0, kPins[i], OUTPUT);
andrewm@268: 	}
andrewm@268: 
andrewm@268: 	return true;
andrewm@268: }
andrewm@268: 
andrewm@268: // render() is called regularly at the highest priority by the audio engine.
andrewm@268: // Input and output are given from the audio hardware and the other
andrewm@268: // ADCs and DACs (if available). If only audio is available, numMatrixFrames
andrewm@268: // will be 0.
andrewm@268: 
giuliomoro@301: void render(BelaContext *context, void *userData)
andrewm@268: {
andrewm@268: 	for(unsigned int n = 0; n < context->audioFrames; n++) {
andrewm@268: 		// Check for rotation between digits
andrewm@268: 		if(--gDigitDisplayTime <= 0) {
andrewm@268: 			gCurrentlyDisplayingDigit = (gCurrentlyDisplayingDigit + 1) % 4;
andrewm@268: 			gDigitDisplayTime = kDigitMaxDisplayTime;
andrewm@268: 		}
andrewm@268: 	
andrewm@268: 		// Write the currently displaying digit low and the rest high
andrewm@268: 		for(int i = 0; i < 4; i++)
andrewm@308: 				digitalWriteOnce(context, n, kPins[kDigits[i]], HIGH);
andrewm@308: 		digitalWriteOnce(context, n, kPins[kDigits[gCurrentlyDisplayingDigit]], LOW);
andrewm@268: 		
andrewm@268: 		// Write the digit to the other outputs
andrewm@308: 		digitalWriteOnce(context, n, kPins[11],
andrewm@268: 			gCharacterToDisplay[gCurrentlyDisplayingDigit] & 0x01);	// a
andrewm@308: 		digitalWriteOnce(context, n, kPins[6], 
andrewm@268: 			gCharacterToDisplay[gCurrentlyDisplayingDigit] & 0x02);	// b
andrewm@308: 		digitalWriteOnce(context, n, kPins[4], 
andrewm@268: 			gCharacterToDisplay[gCurrentlyDisplayingDigit] & 0x04);	// c
andrewm@308: 		digitalWriteOnce(context, n, kPins[1],
andrewm@268: 			gCharacterToDisplay[gCurrentlyDisplayingDigit] & 0x08);	// d
andrewm@308: 		digitalWriteOnce(context, n, kPins[0],
andrewm@268: 			gCharacterToDisplay[gCurrentlyDisplayingDigit] & 0x10);	// e
andrewm@308: 		digitalWriteOnce(context, n, kPins[10],
andrewm@268: 			gCharacterToDisplay[gCurrentlyDisplayingDigit] & 0x20);	// f
andrewm@308: 		digitalWriteOnce(context, n, kPins[5],
andrewm@268: 			gCharacterToDisplay[gCurrentlyDisplayingDigit] & 0x40);	// g
andrewm@308: 		digitalWriteOnce(context, n, kPins[2],
andrewm@268: 			gCharacterToDisplay[gCurrentlyDisplayingDigit] & 0x80);	// .
andrewm@268: 			
andrewm@268: 		// Check for changing state
andrewm@268: 		if(--gStateCounter <= 0) {
andrewm@268: 			gState = (gState + 1) % kMaxState;
andrewm@268: 			if(gState != (kMaxState - 1)) {
andrewm@268: 				for(int i = 0; i < 4; i++)
andrewm@268: 					gCharacterToDisplay[i] = 1 << (gState % 6);
andrewm@268: 				gStateCounter = 2000;
andrewm@268: 			}
andrewm@268: 			else {
andrewm@268: 				for(int i = 0; i < 4; i++)
andrewm@268: 					gCharacterToDisplay[i] = kBELA[i];
andrewm@268: 				gStateCounter = 50000;
andrewm@268: 			}
andrewm@268: 		}
andrewm@268: 	}
andrewm@268: }
andrewm@268: 
andrewm@268: // cleanup() is called once at the end, after the audio has stopped.
andrewm@268: // Release any resources that were allocated in setup().
andrewm@268: 
giuliomoro@301: void cleanup(BelaContext *context, void *userData)
andrewm@268: {
andrewm@268: 	
andrewm@268: }