Blink Without Delay ​

The previous blink example uses a busy loop and a delay, that prevents the program from doing anything useful in between changing the LED's state. Alternatively, we want to avoid using the delay primitive, and instead do something else while we wait.

Circuit ​

For this example you require:

1. A microcontroller
2. An LED
3. 220 ohm resistor

Program ​

We removed the delay from the previous blink example, and use the millis primitive that returns the number of milliseconds since the device started running.

// Blinking LED example
import {pinMode, PinMode, PinVoltage,
        digitalWrite, delay} from "as-warduino/assembly";

export function main(): void {
    const led = 26;
    const pause: u32 = 1000;

    pinMode(led, PinMode.OUTPUT);

    while (true) {
        digitalWrite(led, PinVoltage.HIGH);
        delay(pause);
        digitalWrite(led, PinVoltage.LOW);
        delay(pause);
    }
}

// Blinking LED example
use warduino::{delay, digital_write, pin_mode, PinMode, PinVoltage};

#[no_mangle]
pub fn main() {
    let led: u32 = 26;
    let pause: u32 = 1000;

    pin_mode(led, PinMode::OUTPUT);

    loop {
        digital_write(led, PinVoltage::HIGH);
        delay(pause);
        digital_write(led, PinVoltage::LOW);
        delay(pause);
    }
}