From b9ede455b3dc93a0de8aab81a685d12aeab5807e Mon Sep 17 00:00:00 2001
From: Ivan Stefanov <istefanov@elsys-bg.org>
Date: Tue, 3 Nov 2020 17:37:57 +0200
Subject: [PATCH] Create Timer_1_200ms_ISR.ino

---
 Timer_1_200ms_ISR/Timer_1_200ms_ISR.ino | 43 +++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 Timer_1_200ms_ISR/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
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);
+}
-- 
2.39.5