The classic LED blink program uses delay.
This version uses interrupts
Still flashes LED 13
Here is the code
/*
* This is a interrupt version of the classic blink LED sketch
*/
// pins
const int led_pin = PB5; // PB5 is the same as pin 13
void setup() {
// set LED pin to be a output
DDRB |=(1<< led_pin);// using port B
}
void loop() {
PORTB ^= (1<< led_pin);
delay(200); // turns LED on/off
}
* This is a interrupt version of the classic blink LED sketch
*/
// pins
const int led_pin = PB5; // PB5 is the same as pin 13
void setup() {
// set LED pin to be a output
DDRB |=(1<< led_pin);// using port B
}
void loop() {
PORTB ^= (1<< led_pin);
delay(200); // turns LED on/off
}
//7777777777777777777777777777777777777777
DDRB - The Port B Data Direction Register
Port registers allow for lower-level and faster manipulation of the i/o pins of the microcontroller on an Arduino board. The chips used on the Arduino board (the ATmega8 and ATmega168) have three ports:
- B (digital pin 8 to 13)
- C (analog input pins)
- D (digital pins 0 to 7)
Each port is controlled by three registers, which are also defined variables in the arduino language.
The DDR register, determines whether
the pin is an INPUT or OUTPUT.
The PORT register controls whether the
pin is HIGH or LOW.
The PIN register reads the state of INPUT pins
set to input with pinMode().
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