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[feat](trx-rs): add FT2 decoder protocol support

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Implement a distinct FT2 protocol path in the decoder stack and align\nits timing with the confirmed FT2 framing used by Decodium.\n\nCo-authored-by: OpenAI Codex <codex@openai.com>

Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>
This commit is contained in:
Stan Grams
2026-03-14 19:49:05 +01:00
parent d547c45a9c
commit ad6aa6aab4
9 changed files with 116 additions and 46 deletions
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external/ft8_lib/ft8/constants.h
Vendored
+32 -1
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@@ -14,6 +14,9 @@ extern "C"
#define FT4_SYMBOL_PERIOD (0.048f) ///< FT4 symbol duration, defines tone deviation in Hz and symbol rate
#define FT4_SLOT_TIME (7.5f) ///< FT4 slot period
#define FT2_SYMBOL_PERIOD (0.024f) ///< FT2 symbol duration (288 samples @ 12 kHz)
#define FT2_SLOT_TIME (3.75f) ///< FT2 slot period
// Define FT8 symbol counts
// FT8 message structure:
// S D1 S D2 S
@@ -38,6 +41,14 @@ extern "C"
#define FT4_NUM_SYNC (4) ///< Number of sync groups
#define FT4_SYNC_OFFSET (33) ///< Offset between sync groups
// FT2 reuses the FT4 channel structure with a shorter slot and symbol period.
#define FT2_ND FT4_ND
#define FT2_NR FT4_NR
#define FT2_NN FT4_NN
#define FT2_LENGTH_SYNC FT4_LENGTH_SYNC
#define FT2_NUM_SYNC FT4_NUM_SYNC
#define FT2_SYNC_OFFSET FT4_SYNC_OFFSET
// Define LDPC parameters
#define FTX_LDPC_N (174) ///< Number of bits in the encoded message (payload with LDPC checksum bits)
#define FTX_LDPC_K (91) ///< Number of payload bits (including CRC)
@@ -52,9 +63,29 @@ extern "C"
typedef enum
{
FTX_PROTOCOL_FT4,
FTX_PROTOCOL_FT8
FTX_PROTOCOL_FT8,
FTX_PROTOCOL_FT2
} ftx_protocol_t;
static inline float ftx_protocol_symbol_period(ftx_protocol_t protocol)
{
return (protocol == FTX_PROTOCOL_FT8)
? FT8_SYMBOL_PERIOD
: ((protocol == FTX_PROTOCOL_FT2) ? FT2_SYMBOL_PERIOD : FT4_SYMBOL_PERIOD);
}
static inline float ftx_protocol_slot_time(ftx_protocol_t protocol)
{
return (protocol == FTX_PROTOCOL_FT8)
? FT8_SLOT_TIME
: ((protocol == FTX_PROTOCOL_FT2) ? FT2_SLOT_TIME : FT4_SLOT_TIME);
}
static inline int ftx_protocol_uses_ft4_layout(ftx_protocol_t protocol)
{
return (protocol == FTX_PROTOCOL_FT4) || (protocol == FTX_PROTOCOL_FT2);
}
/// Costas 7x7 tone pattern for synchronization
extern const uint8_t kFT8_Costas_pattern[7];
extern const uint8_t kFT4_Costas_pattern[4][4];