added indicator LED

indicator.cpp

@@ -0,0 +1,19 @@
+
+#include <Arduino.h>
+#include "indicator.hpp"
+#include "tones.hpp"
+
+#define LED_INDICATOR 10
+
+void indicator::init() {
+	pinMode(LED_INDICATOR, OUTPUT);
+}
+
+void indicator::update() {
+    float v = 0;
+    for(int i = 0; i < tones::active; i++) {
+      v += tones::all[i].amplitude;
+    }
+    analogWrite(LED_INDICATOR, min((int)(v * 256), 255));
+}
+

indicator.hpp

@@ -0,0 +1,9 @@
+
+#pragma once
+
+namespace indicator {
+
+	void init();
+	void update();
+};
+

tone-generator.ino

@@ -5,8 +5,10 @@
 #include "timing.hpp"
 #include "util.hpp"
 #include "scheduler.hpp"
+#include "indicator.hpp"
 
-unsigned long int micros_at = 0;
+static unsigned long int micros_at = 0;
+static bool led_state = true;
 
 inline unsigned long micros_diff() {
 	unsigned long now = micros();
@@ -19,11 +21,13 @@ void setup() {
 	dac::init();
   tones::init();
   scheduler::init();
+  indicator::init();
 }
 
 void loop() {
   if(scheduler::running && timing::at >= scheduler::timestamp) {
     scheduler::do_all();
+    indicator::update();
   }
 
   timing::update();