ManchesterCodec.cpp

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#include "ManchesterCodec.hh"

// Manchester encoder table 4 to 8 bits. In binary to show how it works
const uint8_t ManchesterCodec::s_symbols[] __PROGMEM = {
  0b10101010,
  0b10101001,
  0b10100110,
  0b10100101,
  0b10011010,
  0b10011001,
  0b10010110,
  0b10010101,
  0b01101010,
  0b01101001,
  0b01100110,
  0b01100101,
  0b01011010,
  0b01011001,
  0b01010110,
  0b01010101
};

uint8_t
ManchesterCodec::decode4(uint8_t symbol)
{
  uint8_t res = 0;
  if (symbol & 1) res |= 1;
  if (symbol & 4) res |= 2;
  if (symbol & 16) res |= 4;
  if (symbol & 64) res |= 8;
  return (res);
}

// Ethernet frame preamble and delimiter/start symbol
const uint8_t ManchesterCodec::s_preamble[] __PROGMEM = {
  0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x5d
};