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M17 More Work and Fixes; #152

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lwvmobile
2023-07-10 19:13:16 -04:00
parent 986ed27d7d
commit a2c4679632
8 changed files with 643 additions and 80 deletions
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58
src/dsd_frame_sync.c
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@@ -215,7 +215,8 @@ getFrameSync (dsd_opts * opts, dsd_state * state)
char synctest20[21]; //YSF
char synctest21[22]; //P25 S-OEMI (SACCH)
char synctest48[49]; //EDACS
char synctest8[9]; //M17
char synctest8[9]; //M17
char synctest16[17]; //M17 Preamble
char modulation[8];
char *synctest_p;
int symboltest_pos; //symbol test position, match to synctest_pos
@@ -605,11 +606,42 @@ getFrameSync (dsd_opts * opts, dsd_state * state)
}
//end YSF sync
//M17 Sync -- Just Voice and LSF for now
//M17 Sync -- Just STR and LSF for now
strncpy(synctest16, (synctest_p - 15), 16);
strncpy(synctest8, (synctest_p - 7), 8);
if(opts->frame_m17 == 1)
{
if (strcmp(synctest8, M17_STR) == 0)
//preambles will skip dibits in an attempt to prime the
//demodulator but not attempt any decoding
if (strcmp(synctest8, M17_PRE) == 0)
{
if (opts->inverted_m17 == 0)
{
printFrameSync (opts, state, "+M17 PREAMBLE", synctest_pos + 1, modulation);
state->carrier = 1;
state->offset = synctest_pos;
state->max = ((state->max) + lmax) / 2;
state->min = ((state->min) + lmin) / 2;
state->lastsynctype = 98;
fprintf (stderr, "\n");
return (98);
}
}
else if (strcmp(synctest8, M17_PIV) == 0)
{
if (opts->inverted_m17 == 1)
{
printFrameSync (opts, state, "-M17 PREAMBLE", synctest_pos + 1, modulation);
state->carrier = 1;
state->offset = synctest_pos;
state->max = ((state->max) + lmax) / 2;
state->min = ((state->min) + lmin) / 2;
state->lastsynctype = 99;
fprintf (stderr, "\n");
return (99);
}
}
else if (strcmp(synctest8, M17_STR) == 0)
{
if (opts->inverted_m17 == 0)
{
@@ -618,8 +650,11 @@ getFrameSync (dsd_opts * opts, dsd_state * state)
state->offset = synctest_pos;
state->max = ((state->max) + lmax) / 2;
state->min = ((state->min) + lmin) / 2;
if (state->lastsynctype == 16)
if (state->lastsynctype == 16 || state->lastsynctype == 8)
{
state->lastsynctype = 16;
return (16);
}
state->lastsynctype = 16;
fprintf (stderr, "\n");
}
@@ -630,8 +665,11 @@ getFrameSync (dsd_opts * opts, dsd_state * state)
state->offset = synctest_pos;
state->max = ((state->max) + lmax) / 2;
state->min = ((state->min) + lmin) / 2;
if (state->lastsynctype == 9)
if (state->lastsynctype == 99)
{
state->lastsynctype = 9;
return (9);
}
state->lastsynctype = 9;
fprintf (stderr, "\n");
}
@@ -645,8 +683,11 @@ getFrameSync (dsd_opts * opts, dsd_state * state)
state->offset = synctest_pos;
state->max = ((state->max) + lmax) / 2;
state->min = ((state->min) + lmin) / 2;
if (state->lastsynctype == 17)
if (state->lastsynctype == 17 || state->lastsynctype == 9)
{
state->lastsynctype = 17;
return (17);
}
state->lastsynctype = 17;
fprintf (stderr, "\n");
}
@@ -657,8 +698,11 @@ getFrameSync (dsd_opts * opts, dsd_state * state)
state->offset = synctest_pos;
state->max = ((state->max) + lmax) / 2;
state->min = ((state->min) + lmin) / 2;
if (state->lastsynctype == 8)
if (state->lastsynctype == 98)
{
state->lastsynctype = 8;
return (8);
}
state->lastsynctype = 8;
fprintf (stderr, "\n");
}