A script for sending arbitrary message as morse code signals using a LED light with flipper zero GPIO

gpio_morse_code.js

let keyboard = require("keyboard");
let submenu = require("submenu");
let storage = require("storage");
let notify = require("notification");
let gpio = require("gpio"); // remove this if you are not using any GPIO (only using internal LED)

function blink_morse_code(morse_letter, morse_led_pin, time_delay) {
    for (let i = 0; i < morse_letter.length; i++) {
        if (chr(morse_letter.at(i)) === '.'){
            if (morse_led_pin === 'INTERNAL'){
                notify.blink("red", "short");
            } else {
                gpio.write(morse_led_pin, true); // high
                delay(time_delay)
                gpio.write(morse_led_pin, false); // low
            }
        } else if (chr(morse_letter.at(i)) === '-') {
            if (morse_led_pin === 'INTERNAL'){
                notify.blink("red", "long");
            } else {
                gpio.write(morse_led_pin, true); // high
                delay(time_delay*3)
                gpio.write(morse_led_pin, false); // low
            }
        } else {
            delay(time_delay*7);
        };
        delay(time_delay);
      };
};

function arraybuf_to_string(arraybuf) {
    let string = "";
    let data_view = Uint8Array(arraybuf);
    for (let i = 0; i < data_view.length; i++) {
        string += chr(data_view[i]);
    }
    return string;
}

let alphabet = {
    'a': '.-',    'b': '-...',  'c': '-.-.', 'd': '-..',
    'e': '.',     'f': '..-.',  'g': '--.',  'h': '....',
    'i': '..',    'j': '.---',  'k': '-.-',  'l': '.-..',
    'm': '--',    'n': '-.',    'o': '---',  'p': '.--.',
    'q': '--.-',  'r': '.-.',   's': '...',  't': '-',
    'u': '..-',   'v': '...-',  'w': '.--',  'x': '-..-',
    'y': '-.--',  'z': '--..',  ' ': ' ',
    '1': '.----', '2': '..---', '3': '...--', '4': '....-', 
    '5': '.....', '6': '-....', '7': '--...', '8': '---..', 
    '9': '----.', '0': '-----', 
};

if (storage.exists( __dirpath + "/morse_led_pin.txt")){
    print("LED pin configured");
} else {
    storage.write( __dirpath + "/morse_led_pin.txt", "INTERNAL");
};

if (storage.exists( __dirpath + "/morse_message.txt")){
    print("Morse message configured");
} else {
    storage.write( __dirpath + "/morse_message.txt", "sos");
};

if (storage.exists( __dirpath + "/morse_delay.txt")){
    print("Morse delay configured");
} else {
    storage.write( __dirpath + "/morse_delay.txt", "60");
};

if (storage.exists( __dirpath + "/morse_repeat.txt")){
    print("Morse repeat configured");
} else {
    storage.write( __dirpath + "/morse_repeat.txt", "0");
};

submenu.addItem("Send signal", 0);
submenu.addItem("Configure LED pin", 1);
submenu.addItem("Configure message", 2);
submenu.addItem("Configure delay", 3);
submenu.addItem("Repeat forever?", 4);

submenu.setHeader("Select an option:");

let result = submenu.show();
// Returns undefined when pressing back

if (result === 0){
    let morse_led_pin = to_upper_case(arraybuf_to_string(storage.read(__dirpath + "/morse_led_pin.txt")));
    let message = arraybuf_to_string(storage.read(__dirpath + "/morse_message.txt"));
    let time_delay = parse_int(arraybuf_to_string(storage.read(__dirpath + "/morse_delay.txt")));
    let repeat = parse_int(arraybuf_to_string(storage.read(__dirpath + "/morse_repeat.txt")));

    // initialize pins
    if (morse_led_pin !== 'INTERNAL'){
        gpio.init(morse_led_pin, "outputPushPull", "up"); // pin, mode, pull
        gpio.write(morse_led_pin, false); // low
    }

    for (let i = 0; i < message.length; i++) {
        print("Sending", chr(message.at(i)), ">>>", alphabet[chr(message.at(i))]);
        blink_morse_code(alphabet[chr(message.at(i))], morse_led_pin, time_delay)
        delay(time_delay*3)
    };
    if (repeat) {
        delay(time_delay*7)
    };
    while (repeat) {
        for (let i = 0; i < message.length; i++) {
            print("Sending", chr(message.at(i)), ">>>", alphabet[chr(message.at(i))]);
            blink_morse_code(alphabet[chr(message.at(i))], morse_led_pin, time_delay)
            delay(time_delay*3)
        };
        delay(time_delay*7)
    };
};

if (result === 1){
    keyboard.setHeader("Enter LED pin name");
    let text = to_lower_case(keyboard.text(10, "INTERNAL", true));
    // Returns undefined when pressing back
    if (text){
    let success = storage.write( __dirpath + "/morse_led_pin.txt", text);
    print("Writing to file : ", success);
    };
};

if (result === 2){
    keyboard.setHeader("Enter your message");
    let text = to_lower_case(keyboard.text(100, "SOS", true));
    // Returns undefined when pressing back
    if (text){
    let success = storage.write( __dirpath + "/morse_message.txt", text);
    print("Writing to file : ", success);
    };
};

if (result === 3){
    keyboard.setHeader("Enter your delay in ms");
    let text = to_lower_case(keyboard.text(5, "60", true));
    // Returns undefined when pressing back
    if (text){
    let success = storage.write( __dirpath + "/morse_delay.txt", text);
    print("Writing to file : ", success);
    };
};

if (result === 4){
    keyboard.setHeader("Enter 0 (false) or 1 (true) ");
    let text = to_lower_case(keyboard.text(5, "0", true));
    // Returns undefined when pressing back
    if (text){
    let success = storage.write( __dirpath + "/morse_repeat.txt", text);
    print("Writing to file : ", success);
    };
};