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Simple morse en- & decoding for Arduino (including LED Example)Build after the specs on http://en.wikipedia.org/wiki/Morse_code
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Copyright (c) 2015 Matthias Esterl | |
Permission is hereby granted, free of charge, to any person obtaining a copy | |
of this software and associated documentation files (the "Software"), to deal | |
in the Software without restriction, including without limitation the rights | |
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
copies of the Software, and to permit persons to whom the Software is | |
furnished to do so, subject to the following conditions: | |
The above copyright notice and this permission notice shall be included in | |
all copies or substantial portions of the Software. | |
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
THE SOFTWARE. |
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//Define the LED Pin | |
#define PIN_OUT 9 | |
//Define unit length in ms | |
#define UNIT_LENGTH 100 | |
//Build a struct with the morse code mapping | |
static const struct {const char letter, *code;} MorseMap[] = | |
{ | |
{ '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', "--.." }, | |
{ ' ', " " }, //Gap between word, seven units | |
{ '1', ".----" }, | |
{ '2', "..---" }, | |
{ '3', "...--" }, | |
{ '4', "....-" }, | |
{ '5', "....." }, | |
{ '6', "-...." }, | |
{ '7', "--..." }, | |
{ '8', "---.." }, | |
{ '9', "----." }, | |
{ '0', "-----" }, | |
{ '.', ".-.-.-" }, | |
{ ',', "--..--" }, | |
{ '?', "..--.." }, | |
{ '!', "-.-.--" }, | |
{ ':', "---..." }, | |
{ ';', "-.-.-." }, | |
{ '(', "-.--." }, | |
{ ')', "-.--.-" }, | |
{ '"', ".-..-." }, | |
{ '@', ".--.-." }, | |
{ '&', ".-..." }, | |
}; | |
void doMorse(int pin, const char *string) { | |
size_t i, j; | |
for( i = 0; string[i]; ++i ) | |
{ | |
for( j = 0; j < sizeof MorseMap / sizeof *MorseMap; ++j ) | |
{ | |
if( toupper(string[i]) == MorseMap[j].letter ) | |
{ | |
emitMorse(pin, MorseMap[j].code); | |
break; | |
} | |
} | |
emitMorse(pin, " "); //Add tailing space to separate the chars | |
} | |
} | |
void emitMorse(int pin, const char *morseString) { | |
for(int i=0; morseString[i]; i++) | |
{ | |
switch( morseString[i] ) | |
{ | |
case '.': //dit | |
digitalWrite( pin, HIGH ); | |
delay( UNIT_LENGTH ); | |
digitalWrite( pin, LOW ); | |
delay( UNIT_LENGTH ); | |
break; | |
case '-': //dah | |
digitalWrite( pin, HIGH ); | |
delay( UNIT_LENGTH*3 ); | |
digitalWrite( pin, LOW ); | |
delay( UNIT_LENGTH ); | |
break; | |
case ' ': //gap | |
delay( UNIT_LENGTH ); | |
} | |
} | |
} | |
void setup() | |
{ | |
pinMode( PIN_OUT, OUTPUT ); | |
digitalWrite( PIN_OUT, LOW ); | |
} | |
void loop() | |
{ | |
doMorse(PIN_OUT, "SOS "); | |
} |
Oh, I also added a space between chars, for compliance to spec.
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Fixed https://gist.github.com/madc/4474559#gistcomment-1904108
and https://gist.github.com/madc/4474559#gistcomment-2002007
and https://gist.github.com/madc/4474559#gistcomment-2002682
The last one I fixed by making the code emit the blinks as it runs through the input string, rather than doing a bunch of string concatenations and making a new string 4x bigger than the original. With the old code, it broke when I gave it an 8k string; now it works with 32k (and 65k failed to compile).