added tasknote example

Author: glutio

examples/TaskTone/TaskTone.ino

@@ -0,0 +1,62 @@
+#include <Taskfun.h>
+
+#define PIN 3
+
+const char* _melody[] = {
+  "4G4", "4F4", "4G4", "4D4", "8B3", "4D4", "2G3",
+  "4G4", "4F4", "4G4", "4D4", "8B3", "4D4", "2G3",
+  "4G4", "4A4", "4B4", "8A4", "4B4", "4B4", "8G4", "4A4", "8G4", "4A4", "4A4", "8F4", "4G4", "8F4", "4G4", "4G4", "8E4", "2G4"
+};
+const int _melodyLength = sizeof(_melody) / sizeof(_melody[0]);
+
+// Frequency table for notes (in Hz)
+const int _freq[9][7] = {
+  { 27, 31, 16, 18, 21, 22, 25 },                // A0 - G1
+  { 55, 62, 33, 37, 41, 44, 49 },                // A1 - G2
+  { 110, 123, 65, 73, 82, 87, 98 },              // A2 - G3
+  { 220, 247, 131, 147, 165, 175, 196 },         // A3 - G4
+  { 440, 494, 261, 294, 330, 349, 392 },         // A4 - G5
+  { 880, 988, 523, 587, 659, 698, 784 },         // A5 - G6
+  { 1760, 1976, 1047, 1174, 1319, 1397, 1568 },  // A6 - G7
+};
+
+SyncVar<int> _note(0);
+
+int getFreq(const char* note) {
+  return _freq[(note[2] - '0')][note[1] - 'A'];
+}
+
+int getDuration(const char* note) {
+  return 800 / (note[0] - '0');
+}
+
+void playNote(char note) {
+  while (1) {
+    if (_melody[_note][1] == note) {
+      tone(PIN, getFreq(_melody[_note]));
+      delay(getDuration(_melody[_note]));
+      noTone(PIN);
+      delay(20);
+      _note = (_note + 1) % _melodyLength;
+    }
+  }
+}
+
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);
+  pinMode(PIN, OUTPUT);
+  setupTasks('G' - 'A' + 1);
+
+  noInterrupts();
+  for (auto i = 'A'; i <= 'G'; i++) {
+    runTask(playNote, i);
+  }
+  interrupts();
+}
+
+void loop() {
+  digitalWrite(LED_BUILTIN, HIGH);
+  delay(1000);
+  digitalWrite(LED_BUILTIN, LOW);
+  delay(1000);
+}

library.properties

@@ -1,5 +1,5 @@
 name=Taskfun
-version=0.1.1
+version=0.1.2
 author=Eugene Pistrak
 maintainer=Eugene Pistrak
 sentence=Preemptive multitasking for Arduino AVR and SAMD21