comparison examples/02-Digital/digital-input/render.cpp @ 464:8fcfbfb32aa0 prerelease

Examples reorder with subdirectories. Added header to each project. Moved Doxygen to bottom of render.cpp.

+/*
+ ____  _____ _        _    
+| __ )| ____| |      / \   
+|  _ \|  _| | |     / _ \  
+| |_) | |___| |___ / ___ \ 
+|____/|_____|_____/_/   \_\
+
+The platform for ultra-low latency audio and sensor processing
+
+http://bela.io
+
+A project of the Augmented Instruments Laboratory within the
+Centre for Digital Music at Queen Mary University of London.
+http://www.eecs.qmul.ac.uk/~andrewm
+
+(c) 2016 Augmented Instruments Laboratory: Andrew McPherson,
+	Astrid Bin, Liam Donovan, Christian Heinrichs, Robert Jack,
+	Giulio Moro, Laurel Pardue, Victor Zappi. All rights reserved.
+
+The Bela software is distributed under the GNU Lesser General Public License
+(LGPL 3.0), available here: https://www.gnu.org/licenses/lgpl-3.0.txt
+*/
+
+
+#include <Bela.h>
+#include <cmath>
+#include <rtdk.h>
+#include <stdlib.h>
+
+
+bool setup(BelaContext *context, void *userData)
+{
+	pinMode(context, 0, P8_08, INPUT);
+	pinMode(context, 0, P8_07, OUTPUT);
+	return true;
+}
+
+
+void render(BelaContext *context, void *userData)
+{
+	for(unsigned int n=0; n<context->digitalFrames; n++){
+		int status=digitalRead(context, 0, P8_08); //read the value of the button
+		digitalWriteOnce(context, n, P8_07, status); //write the status to the LED
+		float out = 0.1 * status * rand() / (float)RAND_MAX * 2 - 1; //generate some noise, gated by the button
+		for(unsigned int j = 0; j < context->audioChannels; j++){
+			audioWrite(context, n, j, out); //write the audio output
+		}
+	}
+}
+
+
+void cleanup(BelaContext *context, void *userData)
+{
+	// Nothing to do here
+}
+
+/* ------------ Project Explantation ------------ */
+
+/**
+\example 02-digital-input
+
+Switching an LED on and off
+---------------------------
+
+This example brings together digital input and digital output. The program will read 
+a button and turn the LED on and off according to the state of the button.
+
+- connect an LED in series with a 470ohm resistor between P8_07 and ground.
+- connect a 1k resistor to P9_03 (+3.3V),
+- connect the other end of the resistor to both a button and P8_08
+- connect the other end of the button to ground.
+
+You will notice that the LED will normally stay on and will turn off as long as 
+the button is pressed. This is due to the fact that the LED is set to the same 
+value read at input P8_08. When the button is not pressed, P8_08 is `HIGH` and so 
+P8_07 is set to `HIGH` as well, so that the LED conducts and emits light. When 
+the button is pressed, P8_08 goes `LOW` and P8_07 is set to `LOW`, turning off the LED.
+
+As an exercise try and change the code so that the LED only turns on when 
+the button is pressed.
+*/
+