comparison projects/basic_blink/render.cpp @ 108:3068421c0737 ultra-staging

Merged default into ultra-staging

+#include <BeagleRT.h>
+#include <Utilities.h>
+#include <cmath>
+#include <rtdk.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.
+//
+// userData holds an opaque pointer to a data structure that was passed
+// in from the call to initAudio().
+//
+// Return true on success; returning false halts the program.
+
+bool setup(BeagleRTContext *context, void *userData)
+{
+    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
+// ADCs and DACs (if available). If only audio is available, numAnalogFrames
+// will be 0.
+
+/* basic_blink
+* Connect an LED in series with a 470ohm resistor between P8_07 and ground.
+* The LED will blink every @interval seconds.
+*/
+
+void render(BeagleRTContext *context, void *userData)
+{
+  static int count=0; //counts elapsed samples
+  float interval=0.5; //how often to toggle the LED (in seconds)
+  static int status=GPIO_LOW;
+	for(unsigned int n=0; n<context->digitalFrames; n++){
+    if(count==context->digitalSampleRate*interval){ //if enough samples have elapsed
+      count=0; //reset the counter
+    // status=digitalReadFrame(context, 0, P8_07);
+      if(status==GPIO_LOW) { //toggle the status
+          digitalWriteFrame(context, n, P8_07, status); //write the status to the LED
+          status=GPIO_HIGH;
+      }
+      else {
+          digitalWriteFrame(context, n, P8_07, status); //write the status to the LED
+          status=GPIO_LOW;
+      }
+    }
+    count++;
+  }
+}
+
+// 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
+}