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arduino-cli/libraries/TimerOne/examples/Interrupt/Interrupt.pde

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+#include <TimerOne.h>
+
+// This example uses the timer interrupt to blink an LED
+// and also demonstrates how to share a variable between
+// the interrupt and the main program.
+
+
+const int led = LED_BUILTIN;  // the pin with a LED
+
+void setup(void)
+{
+  pinMode(led, OUTPUT);
+  Timer1.initialize(150000);
+  Timer1.attachInterrupt(blinkLED); // blinkLED to run every 0.15 seconds
+  Serial.begin(9600);
+}
+
+
+// The interrupt will blink the LED, and keep
+// track of how many times it has blinked.
+int ledState = LOW;
+volatile unsigned long blinkCount = 0; // use volatile for shared variables
+
+void blinkLED(void)
+{
+  if (ledState == LOW) {
+    ledState = HIGH;
+    blinkCount = blinkCount + 1;  // increase when LED turns on
+  } else {
+    ledState = LOW;
+  }
+  digitalWrite(led, ledState);
+}
+
+
+// The main program will print the blink count
+// to the Arduino Serial Monitor
+void loop(void)
+{
+  unsigned long blinkCopy;  // holds a copy of the blinkCount
+
+  // to read a variable which the interrupt code writes, we
+  // must temporarily disable interrupts, to be sure it will
+  // not change while we are reading.  To minimize the time
+  // with interrupts off, just quickly make a copy, and then
+  // use the copy while allowing the interrupt to keep working.
+  noInterrupts();
+  blinkCopy = blinkCount;
+  interrupts();
+
+  Serial.print("blinkCount = ");
+  Serial.println(blinkCopy);
+  delay(100);
+}