changeset 246:da5ce9876fcc

Improved basic_button project

--- a/projects/basic_button/render.cpp	Tue Apr 19 13:46:37 2016 +0100
+++ b/projects/basic_button/render.cpp	Tue Apr 19 22:22:26 2016 +0100
@@ -1,4 +1,4 @@
-    /*
+/*
  *
  * Andrew McPherson and Victor Zappi
  * Queen Mary, University of London
@@ -8,6 +8,7 @@
 #include <Utilities.h>
 #include <cmath>
 #include <rtdk.h>
+#include <stdlib.h>
 
 // setup() is called once before the audio rendering starts.
 // Use it to perform any initialisation and allocation which is dependent
@@ -20,10 +21,8 @@
 
 bool setup(BeagleRTContext *context, void *userData)
 {
-	for(unsigned int n=0; n<context->digitalFrames; n++){
-		pinModeFrame(context, 0, P8_08, INPUT);
-		pinModeFrame(context, 0, P8_07, OUTPUT);
-	}
+	pinModeFrame(context, 0, P8_08, INPUT);
+	pinModeFrame(context, 0, P8_07, OUTPUT);
 	return true;
 }
 
@@ -42,13 +41,14 @@
 
 void render(BeagleRTContext *context, void *userData)
 {
-	float sum=0;
 	for(unsigned int n=0; n<context->digitalFrames; n++){
 		int status=digitalReadFrame(context, 0, P8_08); //read the value of the button
-		sum += status;
-		digitalWriteFrame(context, n, P8_07, status); //write the status to the LED
+		digitalWriteFrameOnce(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++){
+			audioWriteFrame(context, n, j, out); //write the audio output
+		}
 	}
-	rt_printf("status: %f\n", sum);
 }
 
 // cleanup() is called once at the end, after the audio has stopped.
@@ -58,3 +58,4 @@
 {
 	// Nothing to do here
 }
+