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From FenixWiki

This isn't much of a tutorial, rather some example code, but anyway. This code shows that text input in Fenix is not hard at all: with just a little piece of code, much can be achieved. Note that this is code for Fenix versions 0.93 and up.

Example code

Program texts;

Declare Function String textinput();
End

Begin

    set_fps(60,0);

    say("You typed: '" + textinput() + "'");

    Repeat
        frame;
    Until(key(_esc));

End

Function String textinput()
Private
    String str;
    int t;
    int t2;
    byte last_ascii;
    int txtid;
Begin

    // show what you type in top left corner
    txtid = write_string(0,0,0,0,&str);

    // clean the string
    str = "";

    // get input from the user
    // pressing enter will end the loop
    Loop
        if(ascii!=0&&last_ascii==ascii) // check if a key is pressed and if the same key was pressed last frame
            if(t==0||t>fps/4) // check if the key was just pressed or it has been pressed for 0.25 seconds
                if(t==0||t2>fps/30) // check if the key was just pressed or it has been pressed for the last 0.03 seconds
                    t2=0;
                    switch(ascii) // handle input
                        case 8: //backspace
                            str = substr(str,0,len(str)-1);
                        end
                        case 13: //enter
                            break;
                        end
                        default: //addkey
                            str+=chr(ascii);
                        end
                    end
                end
                t2++;
            end
            t++;
        else
            t = t2 = 0; // reset
        end
        last_ascii = ascii;
        frame;
    End

    // delete the text used
    delete_text(txtid);

    // return the typed string
    return str;

End

Used in example: set_fps(), say(), write_string(), substr(), chr(), declare, function, switch, ascii, fps

You'll find a nice ASCII table here.