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#ifndef MORSE_DECODER_H_
#define MORSE_DECODER_H_
#include <stdint.h>
/* Low level morse symbols */
enum morse_marks {
MORSE_DIT = 0, /* . */
MORSE_DAH = 1, /* - */
};
/* A morse symbol.
* bit 0-8: The transmitted marks (dit, dah)
* bit 12-15: The symbol length. In number of marks.
*/
typedef uint16_t morse_sym_t;
/* Construct a morse symbol */
#define __MORSE_SYM(marks, size) ((morse_sym_t)((marks) | (size) << 12))
#define MORSE_MARK(type, index) ((morse_sym_t)((type) << (index)))
#define MORSE_MAX_NR_MARKS 9
#define MORSE_SYM_1(m0) __MORSE_SYM(((m0) << 0), 1)
#define MORSE_SYM_2(m0, m1) __MORSE_SYM(((m0) << 0) | ((m1) << 1), 2)
#define MORSE_SYM_3(m0, m1, m2) __MORSE_SYM(((m0) << 0) | ((m1) << 1) | ((m2) << 2), 3)
#define MORSE_SYM_4(m0, m1, m2, m3) __MORSE_SYM(((m0) << 0) | ((m1) << 1) | ((m2) << 2) | ((m3) << 3), 4)
#define MORSE_SYM_5(m0, m1, m2, m3, m4) __MORSE_SYM(((m0) << 0) | ((m1) << 1) | ((m2) << 2) | ((m3) << 3) | \
((m4) << 4), 5)
#define MORSE_SYM_6(m0, m1, m2, m3, m4, m5) \
__MORSE_SYM(((m0) << 0) | ((m1) << 1) | ((m2) << 2) | ((m3) << 3) | \
((m4) << 4) | ((m5) << 5), 6)
#define MORSE_SYM_7(m0, m1, m2, m3, m4, m5, m6) \
__MORSE_SYM(((m0) << 0) | ((m1) << 1) | ((m2) << 2) | ((m3) << 3) | \
((m4) << 4) | ((m5) << 5) | ((m6) << 6), 7)
#define MORSE_SYM_8(m0, m1, m2, m3, m4, m5, m6, m7) \
__MORSE_SYM(((m0) << 0) | ((m1) << 1) | ((m2) << 2) | ((m3) << 3) | \
((m4) << 4) | ((m5) << 5) | ((m6) << 6) | ((m7) << 7), 8)
#define MORSE_SYM_9(m0, m1, m2, m3, m4, m5, m6, m7, m8) \
__MORSE_SYM(((m0) << 0) | ((m1) << 1) | ((m2) << 2) | ((m3) << 3) | \
((m4) << 4) | ((m5) << 5) | ((m6) << 6) | ((m7) << 7) | \
((m8) << 8), 9)
static inline uint8_t morse_sym_size(morse_sym_t sym)
{
return (sym & 0xF000) >> 12;
}
static inline void morse_sym_set_size(morse_sym_t *sym, uint8_t size)
{
*sym |= size << 12;
}
/* Returns the marks */
#define MORSE_SYM_MARKS(symbol) ((symbol) & 0x1FF)
/* Returns true, if the symbol is a space between words */
#define MORSE_SYM_IS_SPACE(symbol) ((symbol) == 0)
/* The morse alphabet */
enum morse_character {
MORSE_INVALID = 0,
/* Characters */
MORSE_A = 'A',
MORSE_B = 'B',
MORSE_C = 'C',
MORSE_D = 'D',
MORSE_E = 'E',
MORSE_F = 'F',
MORSE_G = 'G',
MORSE_H = 'H',
MORSE_I = 'I',
MORSE_J = 'J',
MORSE_K = 'K',
MORSE_L = 'L',
MORSE_M = 'M',
MORSE_N = 'N',
MORSE_O = 'O',
MORSE_P = 'P',
MORSE_Q = 'Q',
MORSE_R = 'R',
MORSE_S = 'S',
MORSE_T = 'T',
MORSE_U = 'U',
MORSE_V = 'V',
MORSE_W = 'W',
MORSE_X = 'X',
MORSE_Y = 'Y',
MORSE_Z = 'Z',
MORSE_CHARS_START = MORSE_A,
MORSE_CHARS_END = MORSE_Z,
/* Numbers */
MORSE_0 = '0',
MORSE_1 = '1',
MORSE_2 = '2',
MORSE_3 = '3',
MORSE_4 = '4',
MORSE_5 = '5',
MORSE_6 = '6',
MORSE_7 = '7',
MORSE_8 = '8',
MORSE_9 = '9',
MORSE_NUMS_START = MORSE_0,
MORSE_NUMS_END = MORSE_9,
/* Special characters */
MORSE_GACC_A = 128, /* grave accent A */
MORSE_AE, /* Ä */
MORSE_GACC_E, /* grave accent E */
MORSE_AACC_E, /* acute accent E */
MORSE_OE, /* Ö */
MORSE_UE, /* Ü */
MORSE_SZ, /* ß */
MORSE_CH, /* CH */
MORSE_TILDE_N, /* tilde N */
MORSE_PERIOD, /* . */
MORSE_COMMA, /* , */
MORSE_COLON, /* : */
MORSE_SEMICOLON, /* ; */
MORSE_QUESTION, /* ? */
MORSE_DASH, /* - */
MORSE_UNDERSCORE, /* _ */
MORSE_PAREN_OPEN, /* ( */
MORSE_PAREN_CLOSE, /* ) */
MORSE_TICK, /* ' */
MORSE_EQUAL, /* = */
MORSE_PLUS, /* + */
MORSE_SLASH, /* / */
MORSE_AT, /* @ */
MORSE_SPACE, /* */
MORSE_SPEC_START = MORSE_GACC_A,
MORSE_SPEC_END = MORSE_SPACE,
/* Signals */
MORSE_SIG_KA = 192, /* Start */
MORSE_SIG_BT, /* Pause */
MORSE_SIG_AR, /* End */
MORSE_SIG_VE, /* Understood */
MORSE_SIG_SK, /* End of work */
MORSE_SIG_SOS, /* SOS */
MORSE_SIG_ERROR, /* Error */
MORSE_SIG_START = MORSE_SIG_KA,
MORSE_SIG_END = MORSE_SIG_ERROR,
};
/* Morse factors - In multiples of "dit" */
enum morse_factors {
FACTOR_DIT = 1,
FACTOR_DAH = 3,
FACTOR_INTER_MARK = 1,
FACTOR_INTER_CHAR = 3,
FACTOR_INTER_WORD = 7,
};
/* Length of one "dit" in milliseconds at a rate
* of one word per minute. */
#define DIT_LENGTH_1WPM_MS 1200
morse_sym_t morse_encode_character(enum morse_character mchar);
enum morse_character morse_decode_symbol(morse_sym_t sym);
int8_t morse_to_ascii(char *buf, uint8_t buf_size,
enum morse_character mchar);
#endif /* MORSE_DECODER_H_ */
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