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/*
* Morse decoder
*
* Copyright (c) 2012 Michael Buesch <m@bues.ch>
* Licensed under the terms of the GNU General Public License version 2.
*/
#include "morse.h"
#include "util.h"
#define dit MORSE_DIT
#define dah MORSE_DAH
#define CHAR_SYM(charac, sym) [(charac) - MORSE_CHARS_START] = sym
#define NUM_SYM(num, sym) [(num) - MORSE_NUMS_START] = sym
#define SPEC_SYM(spec, sym) [(spec) - MORSE_SPEC_START] = sym
#define SIG_SYM(sig, sym) [(sig) - MORSE_SIG_START] = sym
static const morse_sym_t PROGMEM character_symbols[] = {
CHAR_SYM(MORSE_A, MORSE_SYM_2(dit, dah)),
CHAR_SYM(MORSE_B, MORSE_SYM_4(dah, dit, dit, dit)),
CHAR_SYM(MORSE_C, MORSE_SYM_4(dah, dit, dah, dit)),
CHAR_SYM(MORSE_D, MORSE_SYM_3(dah, dit, dit)),
CHAR_SYM(MORSE_E, MORSE_SYM_1(dit)),
CHAR_SYM(MORSE_F, MORSE_SYM_4(dit, dit, dah, dit)),
CHAR_SYM(MORSE_G, MORSE_SYM_3(dah, dah, dit)),
CHAR_SYM(MORSE_H, MORSE_SYM_4(dit, dit, dit, dit)),
CHAR_SYM(MORSE_I, MORSE_SYM_2(dit, dit)),
CHAR_SYM(MORSE_J, MORSE_SYM_4(dit, dah, dah, dah)),
CHAR_SYM(MORSE_K, MORSE_SYM_3(dah, dit, dah)),
CHAR_SYM(MORSE_L, MORSE_SYM_4(dit, dah, dit, dit)),
CHAR_SYM(MORSE_M, MORSE_SYM_2(dah, dah)),
CHAR_SYM(MORSE_N, MORSE_SYM_2(dah, dit)),
CHAR_SYM(MORSE_O, MORSE_SYM_3(dah, dah, dah)),
CHAR_SYM(MORSE_P, MORSE_SYM_4(dit, dah, dah, dit)),
CHAR_SYM(MORSE_Q, MORSE_SYM_4(dah, dah, dit, dah)),
CHAR_SYM(MORSE_R, MORSE_SYM_3(dit, dah, dit)),
CHAR_SYM(MORSE_S, MORSE_SYM_3(dit, dit, dit)),
CHAR_SYM(MORSE_T, MORSE_SYM_1(dah)),
CHAR_SYM(MORSE_U, MORSE_SYM_3(dit, dit, dah)),
CHAR_SYM(MORSE_V, MORSE_SYM_4(dit, dit, dit, dah)),
CHAR_SYM(MORSE_W, MORSE_SYM_3(dit, dah, dah)),
CHAR_SYM(MORSE_X, MORSE_SYM_4(dah, dit, dit, dah)),
CHAR_SYM(MORSE_Y, MORSE_SYM_4(dah, dit, dah, dah)),
CHAR_SYM(MORSE_Z, MORSE_SYM_4(dah, dah, dit, dit)),
};
static const morse_sym_t PROGMEM number_symbols[] = {
NUM_SYM(MORSE_0, MORSE_SYM_5(dah, dah, dah, dah, dah)),
NUM_SYM(MORSE_1, MORSE_SYM_5(dit, dah, dah, dah, dah)),
NUM_SYM(MORSE_2, MORSE_SYM_5(dit, dit, dah, dah, dah)),
NUM_SYM(MORSE_3, MORSE_SYM_5(dit, dit, dit, dah, dah)),
NUM_SYM(MORSE_4, MORSE_SYM_5(dit, dit, dit, dit, dah)),
NUM_SYM(MORSE_5, MORSE_SYM_5(dit, dit, dit, dit, dit)),
NUM_SYM(MORSE_6, MORSE_SYM_5(dah, dit, dit, dit, dit)),
NUM_SYM(MORSE_7, MORSE_SYM_5(dah, dah, dit, dit, dit)),
NUM_SYM(MORSE_8, MORSE_SYM_5(dah, dah, dah, dit, dit)),
NUM_SYM(MORSE_9, MORSE_SYM_5(dah, dah, dah, dah, dit)),
};
static const morse_sym_t PROGMEM special_symbols[] = {
SPEC_SYM(MORSE_GACC_A, MORSE_SYM_5(dit, dah, dah, dit, dah)),
SPEC_SYM(MORSE_AE, MORSE_SYM_4(dit, dah, dit, dah)),
SPEC_SYM(MORSE_GACC_E, MORSE_SYM_5(dit, dah, dit, dit, dah)),
SPEC_SYM(MORSE_AACC_E, MORSE_SYM_5(dit, dit, dah, dit, dit)),
SPEC_SYM(MORSE_OE, MORSE_SYM_4(dah, dah, dah, dit)),
SPEC_SYM(MORSE_UE, MORSE_SYM_4(dit, dit, dah, dah)),
SPEC_SYM(MORSE_SZ, MORSE_SYM_6(dit, dit, dit, dah, dah, dit)),
SPEC_SYM(MORSE_CH, MORSE_SYM_4(dah, dah, dah, dah)),
SPEC_SYM(MORSE_TILDE_N, MORSE_SYM_5(dah, dah, dit, dah, dah)),
SPEC_SYM(MORSE_PERIOD, MORSE_SYM_6(dit, dah, dit, dah, dit, dah)),
SPEC_SYM(MORSE_COMMA, MORSE_SYM_6(dah, dah, dit, dit, dah, dah)),
SPEC_SYM(MORSE_COLON, MORSE_SYM_6(dah, dah, dah, dit, dit, dit)),
SPEC_SYM(MORSE_SEMICOLON, MORSE_SYM_6(dah, dit, dah, dit, dah, dit)),
SPEC_SYM(MORSE_QUESTION, MORSE_SYM_6(dit, dit, dah, dah, dit, dit)),
SPEC_SYM(MORSE_DASH, MORSE_SYM_6(dah, dit, dit, dit, dit, dah)),
SPEC_SYM(MORSE_UNDERSCORE, MORSE_SYM_6(dit, dit, dah, dah, dit, dah)),
SPEC_SYM(MORSE_PAREN_OPEN, MORSE_SYM_5(dah, dit, dah, dah, dit)),
SPEC_SYM(MORSE_PAREN_CLOSE, MORSE_SYM_6(dah, dit, dah, dah, dit, dah)),
SPEC_SYM(MORSE_TICK, MORSE_SYM_6(dit, dah, dah, dah, dah, dit)),
SPEC_SYM(MORSE_EQUAL, MORSE_SYM_5(dah, dit, dit, dit, dah)),
SPEC_SYM(MORSE_PLUS, MORSE_SYM_5(dit, dah, dit, dah, dit)),
SPEC_SYM(MORSE_SLASH, MORSE_SYM_5(dah, dit, dit, dah, dit)),
SPEC_SYM(MORSE_AT, MORSE_SYM_6(dit, dah, dah, dit, dah, dit)),
SPEC_SYM(MORSE_SPACE, 0),
};
static const morse_sym_t PROGMEM signal_symbols[] = {
SIG_SYM(MORSE_SIG_KA, MORSE_SYM_5(dah, dit, dah, dit, dah)),
SIG_SYM(MORSE_SIG_BT, MORSE_SYM_5(dah, dit, dit, dit, dah)),
SIG_SYM(MORSE_SIG_AR, MORSE_SYM_5(dit, dah, dit, dah, dit)),
SIG_SYM(MORSE_SIG_VE, MORSE_SYM_5(dit, dit, dit, dah, dit)),
SIG_SYM(MORSE_SIG_SK, MORSE_SYM_6(dit, dit, dit, dah, dit, dah)),
SIG_SYM(MORSE_SIG_SOS, MORSE_SYM_9(dit, dit, dit, dah, dah, dah, dit, dit, dit)),
SIG_SYM(MORSE_SIG_ERROR, MORSE_SYM_8(dit, dit, dit, dit, dit, dit, dit, dit)),
};
static morse_sym_t fetch_sym(const morse_sym_t * PROGPTR table,
uint8_t offset)
{
return pgm_read_word(&table[offset]);
}
morse_sym_t morse_encode_character(enum morse_character c)
{
if (c >= MORSE_CHARS_START && c <= MORSE_CHARS_END)
return fetch_sym(character_symbols, c - MORSE_CHARS_START);
if (c >= MORSE_NUMS_START && c <= MORSE_NUMS_END)
return fetch_sym(number_symbols, c - MORSE_NUMS_START);
if (c >= MORSE_SPEC_START && c <= MORSE_SPEC_END)
return fetch_sym(special_symbols, c - MORSE_SPEC_START);
if (c >= MORSE_SIG_START && c <= MORSE_SIG_END)
return fetch_sym(signal_symbols, c - MORSE_SIG_START);
return fetch_sym(signal_symbols, MORSE_SIG_ERROR - MORSE_SIG_START);
}
enum morse_character morse_decode_symbol(morse_sym_t sym)
{
unsigned int i;
#define check_decode_tab(table, startchar) \
for (i = 0; i < ARRAY_SIZE(table); i++) { \
if (fetch_sym(table, i) == sym) \
return (enum morse_character)(i + startchar); \
}
check_decode_tab(character_symbols, MORSE_CHARS_START)
check_decode_tab(number_symbols, MORSE_NUMS_START)
check_decode_tab(special_symbols, MORSE_SPEC_START)
check_decode_tab(signal_symbols, MORSE_SIG_START)
#undef check_decode_tab
return MORSE_INVALID;
}
int8_t morse_to_ascii(char *buf, uint8_t buf_size,
enum morse_character mchar)
{
int8_t ret = 0;
#define put_char(c) { \
if (!buf_size--) \
return -1; \
*buf++ = (c); \
ret++; \
}
if ((mchar >= MORSE_CHARS_START && mchar <= MORSE_CHARS_END) ||
(mchar >= MORSE_NUMS_START && mchar <= MORSE_NUMS_END)) {
put_char((char)mchar);
} else {
switch (mchar) {
case MORSE_GACC_A:
put_char('A');
break;
case MORSE_GACC_E:
case MORSE_AACC_E:
put_char('E');
break;
case MORSE_AE:
put_char('A');
put_char('E');
break;
case MORSE_OE:
put_char('O');
put_char('E');
break;
case MORSE_UE:
put_char('U');
put_char('E');
break;
case MORSE_SZ:
put_char('S');
put_char('S');
break;
case MORSE_CH:
put_char('C');
put_char('H');
break;
case MORSE_TILDE_N:
put_char('N');
break;
case MORSE_PERIOD:
put_char('.');
break;
case MORSE_COMMA:
put_char(',');
break;
case MORSE_COLON:
put_char(':');
break;
case MORSE_SEMICOLON:
put_char(';');
break;
case MORSE_QUESTION:
put_char('?');
break;
case MORSE_DASH:
put_char('-');
break;
case MORSE_UNDERSCORE:
put_char('_');
break;
case MORSE_PAREN_OPEN:
put_char('(');
break;
case MORSE_PAREN_CLOSE:
put_char(')');
break;
case MORSE_TICK:
put_char('\'');
break;
case MORSE_EQUAL:
put_char('=');
break;
case MORSE_PLUS:
put_char('+');
break;
case MORSE_SLASH:
put_char('/');
break;
case MORSE_AT:
put_char('@');
break;
case MORSE_SPACE:
put_char(' ');
break;
case MORSE_SIG_KA:
case MORSE_SIG_BT:
case MORSE_SIG_AR:
case MORSE_SIG_VE:
case MORSE_SIG_SK:
put_char(' ');
break;
case MORSE_SIG_SOS:
put_char('S');
put_char('0');
put_char('S');
break;
case MORSE_SIG_ERROR:
put_char('-');
put_char('E');
put_char('R');
put_char('R');
put_char('O');
put_char('R');
put_char('-');
break;
default:
return -1;
}
}
#undef put_char
return ret;
}
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