Create Timer_1_200ms_ISR.ino

diff --git a/Timer_1_200ms_ISR/Timer_1_200ms_ISR.ino b/Timer_1_200ms_ISR/Timer_1_200ms_ISR.ino
new file mode 100644 (file)
index 0000000..b1ae812
--- /dev/null
+++ b/Timer_1_200ms_ISR/Timer_1_200ms_ISR.ino
@@ -0,0 +1,43 @@
+void setup() {
+  pinMode(13, OUTPUT);
+  noInterrupts(); //cli(); // Stop reception of interrupts
+
+  // Set PB1 to be an output (Pin9 Arduino UNO)
+  DDRB |= (1 << PB1);
+  // Clear Timer/Counter Control Registers
+  TCCR1A = 0;
+  TCCR1B = 0;
+  TIMSK1 = 0;
+  // Set non-inverting mode - Table 15-3 (page 108)
+  TCCR1A |= (1 << COM1A1);
+  // Set Fast-PWM Mode (Mode 14) - Table 15-5 (page 109)
+  TCCR1A |= (1 << WGM11);
+  TCCR1B |= (1 << WGM12);
+  TCCR1B |= (1 << WGM13);
+  // Clear Timer 1 Counter
+  TCNT1  = 0;
+  // Set PWM frequency/top value - Output PWM 10kHz
+  ICR1 = 199;
+  OCR1A = 180;
+  // Enable compare match interrupt
+  TIMSK1 |= (1 << OCIE1A);
+  TIMSK1 |= (1 << TOIE1);
+  // Set prescaler to 8 and starts PWM
+  TCCR1B |= (1 << CS11);
+
+  interrupts(); //sei();
+}
+
+void loop() {
+  // Empty
+}
+
+//Timer1 Compare Match Interrupt turns OFF pin 13 (LED)
+ISR(TIMER1_COMPA_vect) {
+  digitalWrite(13, LOW);
+}
+
+//Timer1 Overflow Interrupt turns ON pin 13 (LED)
+ISR(TIMER1_OVF_vect) {
+  digitalWrite(13, HIGH);
+}