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Yet another POCSAG bugfix (multi-batch messages are not cut anymore)

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Added BCH ECC functions for checking, error correction and encoding
This commit is contained in:
furrtek
2017-02-06 20:32:33 +00:00
parent 98f89a84bb
commit 24abe4b427
9 changed files with 627 additions and 64 deletions
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12
firmware/common/pocsag.hpp
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@@ -23,16 +23,20 @@
#ifndef __POCSAG_H__
#define __POCSAG_H__
#define POCSAG_PREAMBLE_LENGTH 576
#define POCSAG_TIMEOUT (576 * 2) // Preamble length * 2
#define POCSAG_SYNC 0x7CD215D8
#define POCSAG_IDLE 0x7A89C197
#define POCSAG_SYNCWORD 0x7CD215D8
#define POCSAG_IDLEWORD 0x7A89C197
#define POCSAG_AUDIO_RATE 24000
#define POCSAG_BATCH_LENGTH (17 * 32)
#include "pocsag_packet.hpp"
#include "bch_code.hpp"
namespace pocsag {
// Todo: these enums suck, make a better decode_batch
enum Mode : uint32_t {
STATE_CLEAR,
STATE_HAVE_ADDRESS,
@@ -58,7 +62,9 @@ struct POCSAGState {
std::string bitrate_str(BitRate bitrate);
std::string flag_str(PacketFlag packetflag);
bool decode_batch(const POCSAGPacket& batch, POCSAGState * const state);
void insert_BCH(BCHCode& BCH_code, uint32_t * codeword);
void pocsag_encode(BCHCode& BCH_code, const std::string text, const uint32_t address, std::vector<uint32_t>& codewords);
bool pocsag_decode_batch(const POCSAGPacket& batch, POCSAGState * const state);
} /* namespace pocsag */