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