87 lines
1.9 KiB
C++
87 lines
1.9 KiB
C++
/*
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Timer Interrupts Example
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Demonstrates usage of the HardwareTimer classes by blinking the LED
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Created 22 April 2010, last updated 8 June 2010
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By Bryan Newbold for LeafLabs
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This code is released with no strings attached.
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*/
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#define LED_PIN 13
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#define BUTTON_PIN 38
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#define LED_RATE 500000 // in microseconds; should give 0.5Hz toggles
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void handler_led(void);
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void handler_count1(void);
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void handler_count2(void);
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int toggle = 0;
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int count1 = 0;
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int count2 = 0;
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void setup()
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{
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// Set up the LED to blink
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pinMode(LED_PIN, OUTPUT);
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// Set up BUT for input
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pinMode(BUTTON_PIN, INPUT_PULLUP);
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// Setup LED Timer
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Timer2.setChannel1Mode(TIMER_OUTPUTCOMPARE);
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Timer2.setPeriod(LED_RATE); // in microseconds
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Timer2.setCompare1(1); // overflow might be small
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Timer2.attachCompare1Interrupt(handler_led);
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// Setup Counting Timers
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Timer3.setChannel1Mode(TIMER_OUTPUTCOMPARE);
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Timer4.setChannel1Mode(TIMER_OUTPUTCOMPARE);
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Timer3.pause();
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Timer4.pause();
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Timer3.setCount(0);
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Timer4.setCount(0);
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Timer3.setOverflow(30000);
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Timer4.setOverflow(30000);
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Timer3.setCompare1(1000); // somewhere in the middle
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Timer4.setCompare1(1000);
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Timer3.attachCompare1Interrupt(handler1);
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Timer4.attachCompare1Interrupt(handler2);
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Timer3.resume();
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Timer4.resume();
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}
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void loop() {
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// Display the running counts
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SerialUSB.print("Count 1: ");
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SerialUSB.print(count1);
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SerialUSB.print("\t\tCount 2: ");
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SerialUSB.println(count2);
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// Run... while BUT is held, pause Count2
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for(int i = 0; i<1000; i++) {
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if(digitalRead(BUTTON_PIN)) {
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Timer4.pause();
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} else {
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Timer4.resume();
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}
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delay(1);
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}
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}
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void handler_led(void) {
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toggle ^= 1;
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digitalWrite(LED_PIN, toggle);
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}
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void handler1(void) {
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count1++;
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}
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void handler2(void) {
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count2++;
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}
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