xorshift32_microbit.ts

const device_pins = [
    AnalogPin.P0,
    AnalogPin.P1,
    AnalogPin.P2,
    AnalogPin.P3,
    AnalogPin.P4,
    AnalogPin.P5,
    AnalogPin.P6,
    AnalogPin.P7,
    AnalogPin.P8,
    AnalogPin.P9,
    AnalogPin.P10,
    AnalogPin.P11,
    AnalogPin.P12,
    AnalogPin.P13,
    AnalogPin.P14,
    AnalogPin.P15,
    AnalogPin.P16,
    AnalogPin.P19,
    AnalogPin.P20,
];

const xorshift32 = (seed: number): number => {
    let x = seed;

    x ^= x << 13;
    x ^= x >> 17;
    x ^= x << 5;
    return x;
};

const gen_random = (maxLength?: number): number => {
    const temp = input.temperature();
    const time = input.runningTimeMicros();
    const average_of_pin_values =
        device_pins
            .map((p) => pins.analogReadPin(p))
            .reduce((a: number, b: number) => a + b, 0) / device_pins.length;

    const generated = xorshift32(time + xorshift32(average_of_pin_values) + xorshift32(temp));

    return typeof maxLength !== "undefined"
        ? parseInt(generated.toString().slice(0, maxLength)) >> maxLength
        : generated;
};

basic.forever(() => {
    serial.writeValue("length_2", gen_random(2));
    serial.writeValue("length_undefined", gen_random());
});