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Converting Numbers to Morse Code with GCC
August 9th, 2010

Converting Numbers to Morse Code with GCC

One of my microcontroller projects requires me to measure values and transmit then in Morse code. There may be code out there to do this already, but I couldn't find it. I'm sure there are more elegant and efficient ways to handle the conversion, but this works for me. Hopefully someone will find it useful!

#include <stdio.h>

//Morse code numbers from 0 to 9
char *array[10] = {"-----", ".----", "..---", "...--", "....-",
                   ".....", "-....", "--...", "---..", "----."};

void beep(char v)
{
    // beep (or print) Morse code as necessary
    printf("%s ", array[v]);
}

void send(int l)
{
    // convert a number into Morse code
    char d = 0;
    int t = 0;
    int val = 0;
    for (t = 100000; t > 0; t = t / 10)
    { //number of digits here
        if (l > t)
        {
            d = l / t;
            beep(d);
            l -= d * t;
        }
        else
        {
            beep(0);
        }
    }
    printf("n");
}

void main()
{
    // program starts here
    int l = 0b1111111111; //sample number (maximum 10-bit)
    printf("%d ", l);
    send(l);
    l = 0b11010001100101100011; //larger sample number
    printf("%d ", l);
    send(l);
}