comparison projects/basic_button/render.cpp @ 246:da5ce9876fcc

Improved basic_button project

-    /*
+/*
  *
  * Andrew McPherson and Victor Zappi
  * Queen Mary, University of London
  */
 
 #include <BeagleRT.h>
 #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
 // on the period size or sample rate.
 //

 //
 // Return true on success; returning false halts the program.
 
 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;
 }
 
 // render() is called regularly at the highest priority by the audio engine.
 // Input and output are given from the audio hardware and the other

 * The program will read the button and make the LED blink when the button is pressed.
 */
 
 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.
 // Release any resources that were allocated in setup().
 
 void cleanup(BeagleRTContext *context, void *userData)
 {
 	// Nothing to do here
 }
+