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[fix](trx-rs): correct FT2 OSD generator setup

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This commit is contained in:
Stan Grams
2026-03-14 21:18:13 +01:00
parent e6a78d0ec0
commit f43f3a27fd
2 changed files with 20 additions and 2 deletions
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external/ft8_lib/ft8/ldpc.c
Vendored
+19 -1
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@@ -23,6 +23,7 @@ static int ldpc_check(uint8_t codeword[]);
static float fast_tanh(float x);
static float fast_atanh(float x);
static void pack_bits91(const uint8_t bit_array[], int num_bits, uint8_t packed[]);
static void unpack_bits91(const uint8_t packed[], int num_bits, uint8_t bit_array[]);
static bool check_crc91(const uint8_t plain91[]);
static void encode174_91_nocrc_bits(const uint8_t message91[], uint8_t codeword[]);
static int cmp_reliability_desc(const void* lhs, const void* rhs);
@@ -293,6 +294,12 @@ static void pack_bits91(const uint8_t bit_array[], int num_bits, uint8_t packed[
}
}
static void unpack_bits91(const uint8_t packed[], int num_bits, uint8_t bit_array[])
{
for (int i = 0; i < num_bits; ++i)
bit_array[i] = (packed[i / 8] >> (7 - (i % 8))) & 0x1u;
}
static bool check_crc91(const uint8_t plain91[])
{
uint8_t a91[FTX_LDPC_K_BYTES];
@@ -508,7 +515,18 @@ static void osd174_91(float llr[], int k, uint8_t apmask[], int ndeep, uint8_t m
for (int i = 0; i < FTX_LDPC_K; ++i)
{
uint8_t msg[FTX_LDPC_K] = { 0 };
msg[i] = 1;
if (i < 77)
{
uint8_t payload[10] = { 0 };
uint8_t a91[FTX_LDPC_K_BYTES];
payload[i / 8] |= (uint8_t)(0x80u >> (i % 8));
ftx_add_crc(payload, a91);
unpack_bits91(a91, FTX_LDPC_K, msg);
}
else
{
msg[i] = 1;
}
encode174_91_nocrc_bits(msg, gen[i]);
}
gen_ready = true;