HammingCodec_8_4.cpp

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#include "HammingCodec_8_4.hh"

// Encoding table; 4-bit code to 8-bit symbol
const uint8_t HammingCodec_8_4::s_symbols[16] __PROGMEM = {
  0x0f, 0x18, 0x24, 0x33, 0x42, 0x55, 0x69, 0x7e,
  0x81, 0x96, 0xaa, 0xbd, 0xcc, 0xdb, 0xe7, 0xf0
};

// Decoding table; 8-bit symbol to 4-bit code (packed table)
const uint8_t HammingCodec_8_4::s_codes[128] __PROGMEM = {
  0x08, 0x40, 0x20, 0x00, 0x10, 0x00, 0x00, 0x00,
  0x11, 0x13, 0x15, 0x91, 0x11, 0x11, 0x11, 0x10,
  0x22, 0x23, 0x22, 0x22, 0x26, 0xa2, 0x22, 0x20,
  0x33, 0x33, 0x23, 0x33, 0x13, 0x33, 0x3b, 0x73,
  0x44, 0x44, 0x45, 0x44, 0x46, 0x44, 0xc4, 0x40,
  0x55, 0x45, 0x55, 0x55, 0x15, 0x5d, 0x55, 0x75,
  0x66, 0x46, 0x26, 0x6e, 0x66, 0x66, 0x66, 0x76,
  0xf7, 0x73, 0x75, 0x77, 0x76, 0x77, 0x77, 0x77,
  0x88, 0x88, 0x88, 0x98, 0x88, 0xa8, 0xc8, 0x80,
  0x98, 0x99, 0x99, 0x99, 0x19, 0x9d, 0x9b, 0x99,
  0xa8, 0xaa, 0x2a, 0xae, 0xaa, 0xaa, 0xab, 0xaa,
  0xfb, 0xb3, 0xbb, 0x9b, 0xbb, 0xab, 0xbb, 0xbb,
  0xc8, 0x4c, 0xcc, 0xce, 0xcc, 0xcd, 0xcc, 0xcc,
  0xfd, 0xdd, 0xd5, 0x9d, 0xdd, 0xdd, 0xcd, 0xdd,
  0xfe, 0xee, 0xee, 0xee, 0xe6, 0xae, 0xce, 0xee,
  0xff, 0xff, 0xff, 0xfe, 0xff, 0xfd, 0xfb, 0x7f
};

/*
 * Calculating the start symbol (8-bits per symbol):
 * 0x55, 0x55 => 0101.0101, 0101.0101 (preamble 7-bit).
 * 0x55, 0x5a => 0101.0101, 0101.1010
 */
const uint8_t HammingCodec_8_4::s_preamble[8] __PROGMEM = {
  0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x5a
};