ua1zbe
/
dsd-fme
mirror of https://github.com/lwvmobile/dsd-fme.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

M17 - Misc Code / Comment Cleanup;

This commit is contained in:
lwvmobile 2024-04-04 09:20:08 -04:00
parent bceac916fe
commit cee797017b
1 changed files with 22 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
src/m17.c
View File

@ -217,7 +217,7 @@ int M17processLICH(dsd_state * state, dsd_opts * opts, uint8_t * lich_bits)
bool g[4];
uint8_t lich_counter = 0;
uint8_t lich_reserve = 0;
uint8_t lich_reserve = 0; UNUSED(lich_reserve);
uint16_t crc_cmp = 0;
uint16_t crc_ext = 0;
@ -256,11 +256,11 @@ int M17processLICH(dsd_state * state, dsd_opts * opts, uint8_t * lich_bits)
// if (err == 0 && lich_reserve != 0) fprintf(stderr, " LRS: %d", lich_reserve);
//This is not M17 standard, but use the LICH reserved bits to signal data type and CAN value
if (err == 0 && opts->m17encoder == 1) //only use when using built in encoder
{
state->m17_str_dt = lich_reserve & 0x3;
state->m17_can = (lich_reserve >> 2) & 0x7;
}
// if (err == 0 && opts->m17encoder == 1) //only use when using built in encoder
// {
// state->m17_str_dt = lich_reserve & 0x3;
// state->m17_can = (lich_reserve >> 2) & 0x7;
// }
//transfer to storage
for (i = 0; i < 40; i++)
@ -715,10 +715,10 @@ void processM17LSF(dsd_opts * opts, dsd_state * state)
//not quite as good as it needs to be, need better decision making on the punctured bit
int i, j, k, x;
uint8_t dbuf[184]; //384-bit frame - 16-bit (8 symbol) sync pattern (184 dibits)
uint8_t m17_rnd_bits[368]; //368 bits that are still scrambled (randomized)
uint8_t dbuf[184]; //384-bit frame - 16-bit (8 symbol) sync pattern (184 dibits)
uint8_t m17_rnd_bits[368]; //368 bits that are still scrambled (randomized)
uint8_t m17_int_bits[368]; //368 bits that are still interleaved
uint8_t m17_bits[368]; //368 bits that have been de-interleaved and de-scramble
uint8_t m17_bits[368]; //368 bits that have been de-interleaved and de-scrambled
uint8_t m17_depunc[500]; //488 bits after depuncturing
memset (dbuf, 0, sizeof(dbuf));
@ -871,16 +871,16 @@ void processM17LSF(dsd_opts * opts, dsd_state * state)
} //end processM17LSF
//This version is the older method, skipping the depuncturing and just doing deconv
//original version using nxdn convolutional decoder, used for encoder debug
void processM17LSF_debug(dsd_opts * opts, dsd_state * state, uint8_t * m17_rnd_bits)
{
//NOTE: Why is this being a pain in the ass now?
//NOTE: Same as OTA processM17LSF, sans dibit collection
int i, j, k, x;
uint8_t m17_int_bits[368]; //368 bits that are still interleaved
uint8_t m17_bits[368]; //368 bits that have been de-interleaved and de-scramble
uint8_t m17_bits[368]; //368 bits that have been de-interleaved and de-scramble
uint8_t m17_depunc[500]; //488 bits after depuncturing
memset (m17_int_bits, 0, sizeof(m17_int_bits));
@ -1004,11 +1004,16 @@ void processM17LSF_debug(dsd_opts * opts, dsd_state * state, uint8_t * m17_rnd_b
} //end processM17LSF_debug
//this debug version using the libm17 viterbi decoder plus weight states
void processM17LSF_debug2(dsd_opts * opts, dsd_state * state, uint8_t * m17_rnd_bits)
{
//Working: Switched to libM17 Viterbi Decoder
//Working: Switched to libM17 Viterbi Decoder, but the logic for weigted 'soft bits'
//isn't as well as it could be, really wants the symbol values to make estimations
//TODO: See if noted above can be tweaked using dibit buffer values or something
int i, j, k, x;
uint8_t m17_int_bits[368]; //368 bits that are still interleaved
uint8_t m17_int_bits[368]; //368 bits that are still interleaved
uint16_t m17_bits[368]; //368 bits that have been de-interleaved and de-scrambled
uint16_t m17_depunc[488]; //488 weighted byte representation of bits after depuncturing
uint8_t lsf_bytes[31];
@ -1604,16 +1609,6 @@ void encodeM17STR(dsd_opts * opts, dsd_state * state)
uint16_t lsf_cn = can; //can value
uint16_t lsf_rs = 0; //reserved bits
//Viterbi decoder seems to respond better to non-zero fill, so, when no enc is used
//let's set the lsf_es to 2 for RES, and fill the nonce value with repeating 0x69
//NOTE: This has seemingly been fixed with the dead air tweaks
// if (lsf_et == 0)
// {
// lsf_es = 3; //RES
// for (i = 0; i < 14; i++)
// nonce[i] = 0x69;
// }
//compose the 16-bit frame information from the above sub elements
uint16_t lsf_fi = 0;
lsf_fi = (lsf_ps & 1) + (lsf_dt << 1) + (lsf_et << 3) + (lsf_es << 5) + (lsf_cn << 7) + (lsf_rs << 11);
@ -2100,9 +2095,9 @@ void encodeM17STR(dsd_opts * opts, dsd_state * state)
lsf_chunk[lich_cnt][42] = (lich_cnt >> 0) & 1;
//This is not M17 standard, but use the LICH reserved bits to signal can and dt
lsf_chunk[lich_cnt][43] = (lsf_cn >> 2) & 1;
lsf_chunk[lich_cnt][44] = (lsf_cn >> 1) & 1;
lsf_chunk[lich_cnt][45] = (lsf_cn >> 0) & 1;
// lsf_chunk[lich_cnt][43] = (lsf_cn >> 2) & 1;
// lsf_chunk[lich_cnt][44] = (lsf_cn >> 1) & 1;
// lsf_chunk[lich_cnt][45] = (lsf_cn >> 0) & 1;
lsf_chunk[lich_cnt][46] = (lsf_dt >> 1) & 1;
lsf_chunk[lich_cnt][47] = (lsf_dt >> 0) & 1;
@ -2316,16 +2311,6 @@ void encodeM17STR(dsd_opts * opts, dsd_state * state)
// for (i = 0; i < 14; i++)
// fprintf (stderr, " %02X", nonce[i]);
//Viterbi decoder seems to respond better to non-zero fill, so, when no enc is used
//let's set the lsf_es to 2 for RES, and fill the nonce value with repeating 0x69
//NOTE: This has seemingly been fixed with the dead air tweaks
// if (lsf_et == 0)
// {
// lsf_es = 3; //RES
// for (i = 0; i < 14; i++)
// nonce[i] = 0x69;
// }
//load the nonce from packed bytes to a bitwise iv array
memset(iv, 0, sizeof(iv));
k = 0;
@ -2587,9 +2572,6 @@ void encodeM17PKT(dsd_opts * opts, dsd_state * state)
char d40[50] = "DSD-FME "; //DST
char s40[50] = "DSD-FME "; //SRC
// dst = 0xEE6B28000000; //viterbi debug values
// src = 0xEE6B28000000; //viterbi debug values
//Default
// char text[800] = "This is a simple SMS text message sent over M17 Packet Data.";