station.c

#include "functions.h"

int main(int argc, char* argv[])
{
    // Optional argv[1]: String to display
    const char* str = "So Long, and Thanks for All the Fish! ( H2G2 )";
    if (argc >= 2)
        str = argv[1];

    // Optional argv[2]: delay between ticks in (ms)
    int delay = 150;
    if (argc >= 3)
        delay = string_to_number(argv[2]);

    int str_length = string_length(str);
    char letter = '0';
    while (letter <= 'z')
    {
        for (int i = 0; i < str_length; ++i)
        {
            char c = str[i];
            if (c < letter)
                put_char(c);
            else
                put_char(letter);
        }

        // Advance letter
        // Loop from '0' to '9', 'A' to 'Z' and 'a' to 'z'
        switch (letter)
        {
            case '9': letter = 'A'; break;
            case 'Z': letter = 'a'; break;
            default:  letter++;
        }

        update_output();
        put_char('\r');       // Carriage return
        sleep_ms(delay);
    }

    return 0;
}