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dsd-fme_18_05_2023
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NXDN Preamble + FSW Sync;

This commit is contained in:
lwvmobile 2022-11-24 18:43:51 -05:00
parent 66f710e877
commit ea399e50a8
2 changed files with 37 additions and 4 deletions
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4
include/dsd.h
View File

@ -697,8 +697,12 @@ typedef struct
#define DMR_MS_DATA_SYNC "311131133313133331131113"
#define DMR_MS_VOICE_SYNC "133313311131311113313331"
//Part 1-A CAI 4.4.4 (FSW only - Late Entry - Marginal Signal)
#define NXDN_FSW "3131331131"
#define INV_NXDN_FSW "1313113313"
//Part 1-A CAI 4.4.3 Preamble Last 9 plus FSW (start of RDCH)
#define NXDN_PANDFSW "3131133313131331131" //19 symbols
#define INV_NXDN_PANDFSW "1313311131313113313" //19 symbols
#define DMR_RC_DATA_SYNC "131331111133133133311313"

37
src/dsd_frame_sync.c
View File

@ -195,7 +195,8 @@ getFrameSync (dsd_opts * opts, dsd_state * state)
int i, j, t, o, dibit, sync, symbol, synctest_pos, lastt;
char synctest[25];
char synctest12[13]; //dPMR
char synctest10[11];
char synctest10[11]; //NXDN FSW only
char synctest19[20]; //NXDN Preamble + FSW
char synctest18[19];
char synctest32[33];
char synctest20[21]; //YSF
@ -1257,8 +1258,34 @@ getFrameSync (dsd_opts * opts, dsd_state * state)
//NXDN FSW sync and handling - moved to very bottom of sync stack for falsing sanity
else if ((opts->frame_nxdn96 == 1) || (opts->frame_nxdn48 == 1))
{
strncpy (synctest10, (synctest_p - 9), 10);
if ( (strncmperr (synctest10, NXDN_FSW, 10, 1) == 0) )
strncpy (synctest10, (synctest_p - 9), 10); //FSW only
strncpy (synctest19, (synctest_p - 18), 19); //Preamble + FSW
//Preamble plus FSW, proceed right away
if ( (strncmperr (synctest19, NXDN_PANDFSW, 19, 1) == 0) )
{
state->carrier = 1;
state->offset = synctest_pos;
state->max = ((state->max) + lmax) / 2;
state->min = ((state->min) + lmin) / 2;
state->lastsynctype = 28;
state->last_cc_sync_time = time(NULL);
if (opts->payload == 1) fprintf (stderr, "PANDF ");
return (28);
}
else if ( (strncmperr (synctest19, INV_NXDN_PANDFSW, 19, 1) == 0) )
{
state->carrier = 1;
state->offset = synctest_pos;
state->max = ((state->max) + lmax) / 2;
state->min = ((state->min) + lmin) / 2;
state->lastsynctype = 29;
state->last_cc_sync_time = time(NULL);
if (opts->payload == 1) fprintf (stderr, "PANDF ");
return (29);
}
else if ( (strncmperr (synctest10, NXDN_FSW, 10, 1) == 0) )
{
state->carrier = 1;
state->offset = synctest_pos;
@ -1268,13 +1295,14 @@ getFrameSync (dsd_opts * opts, dsd_state * state)
if (state->lastsynctype == 28)
{
state->last_cc_sync_time = time(NULL);
if (opts->payload == 1) fprintf (stderr, "FSW ");
return (28);
}
state->lastsynctype = 28; //need two consecutive patterns to continue
}
if ( (strncmperr (synctest10, INV_NXDN_FSW, 10, 1) == 0) )
else if ( (strncmperr (synctest10, INV_NXDN_FSW, 10, 1) == 0) )
{
state->carrier = 1;
state->offset = synctest_pos;
@ -1284,6 +1312,7 @@ getFrameSync (dsd_opts * opts, dsd_state * state)
if (state->lastsynctype == 29)
{
state->last_cc_sync_time = time(NULL);
if (opts->payload == 1) fprintf (stderr, "FSW ");
return (29);
}
state->lastsynctype = 29; //need two consecutive patterns to continue