from microbit import *
# Morse Code Text Sender.  G3RSP January 2017
# Version 3
lookup = {
 "a": (130),  # =  82h = 0 1xxx   0010
 "b": (260),  # = 104h = 1 000x   0100
 "c": (324),  # = 144h = 1 010x   0100
 "d": (259),  # = 103h = 1 00xx   0011
 "e": (1),    # =   1h = 0 xxxx   0001
 "f": (68),   # =  44h = 0 010x   0100
 "g": (387),
 "h": (4),
 "i": (2),
 "j": (228),
 "k": (323),
 "l": (132),
 "m": (386),
 "n": (258),
 "o": (451),
 "p": (196),
 "q": (420),
 "r": (131),
 "s": (3),
 "t": (257),
 "u": (67),
 "v": (36),
 "w": (195),
 "x": (292),
 "y": (356),
 "z": (388),
 " ": (0),
 "1": (245),
 "2": (117),
 "3": (53),
 "4": (21),
 "5": (5),
 "6": (261),
 "7": (389),
 "8": (453),
 "9": (485),
 "0": (501),
 "/": (293),
 ".": (174),
 ",": (414),
 "?": (102),
 "(": (357),
 ")": (365),
 "'": (246),
 "=": (277),
 "-": (270)
 }


def decode(buffer):
    return lookup.get(buffer)


def send_dit():
    speed = pin2.read_analog()
    pin1.write_digital(1)
    sleep(speed)
    pin1.write_digital(0)
    sleep(speed)


def send_dah():
    speed = pin2.read_analog()
    pin1.write_digital(1)
    sleep(speed * 3)
    pin1.write_digital(0)
    sleep(speed)


def send_letter(mc):
    elc = 0
    els = mc & 7
    while elc < els:
        bit = mc & 256
        elc = elc + 1
        mc = mc * 2
        if bit == 256:
            send_dah()
        if bit == 0:
            send_dit()


def send_text():
    tctr = 0
    while tctr < len(text):
        char = text[tctr]
        speed = pin2.read_analog()
        if char == " ":
            sleep(speed)
        buffer = char
        mc = decode(buffer)
        send_letter(mc)
        sleep(speed * 2)
        tctr = tctr + 1


msg1 = "abcdefghijklmnopqrstuvwxyz1234567890/.,?(-=)"
msg2 = "the quick brown fox jumped over the lazy dog's back"
msg3 = "pneumonoultramicroscopicsilicovolcanoconios?"

pin1.write_digital(0)
while True:
    speed = pin2.read_analog()
    if button_a.is_pressed():
        text = msg1
        send_text()
    if button_b.is_pressed():
            text = msg2
            send_text()
    if pin8.read_digital():
            text = msg3
            send_text()