Create CheckTimer2.ino

Kruemelbahn · Nov 27, 2023 · b489a84 · b489a84
1 parent 404780b
commit b489a84
Showing 1 changed file with 35 additions and 0 deletions.
diff --git a/examples/CheckTimer2/CheckTimer2.ino b/examples/CheckTimer2/CheckTimer2.ino
@@ -0,0 +1,35 @@
+volatile boolean state;
+boolean state13;
+
+#define LEDPIN 6
+
+// toggles every 2ms
+ISR(TIMER2_COMPA_vect)
+{
+  state = !state;
+  digitalWrite(LEDPIN, state);
+}
+
+void setup()
+{
+  pinMode(LEDPIN, OUTPUT);
+  pinMode(13, OUTPUT);
+  state = true;
+  state13 = true;
+
+  cli();
+  // set up Timer 2:
+  TCCR2A = 0;                       // normal operation
+  TCCR2B = bit(WGM22) | bit(CS20) | bit(CS22);  		// CTC, pre-scaling = 128
+  OCR2A =  249 * clockCyclesPerMicrosecond() / 16;	// compare A register value (8-Bit!) (250 * clock speed / 128)
+  TIMSK2 = bit(OCIE2A);             // interrupt on Compare A Match
+
+  sei();  // set interrupts flag
+}
+
+void loop()
+{
+  // toggles prox. all 4.1µs
+  state13 = !state13;
+  digitalWrite(13, state13);
+}