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- reduced spurious detection of preamble

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git-svn-id: http://moon:8086/svn/software/trunk/projects/GnuRadio@398 b431acfa-c32f-4a4a-93f1-934dc6c82436
This commit is contained in:
jens
2019-01-10 09:52:27 +00:00
parent 49ff240a98
commit 86d994ad42
1 changed files with 23 additions and 3 deletions
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gr-jay/lib/preamble_sync_impl.cc
+20
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@@ -81,6 +81,7 @@ int preamble_sync_impl::general_work (int noutput_items, gr_vector_int &ninput_i
{ {
m_state = PreambleSlow; m_state = PreambleSlow;
m_wordCount = 0; m_wordCount = 0;
m_dataCount = 0;
fprintf(stderr, "Reset\n"); fprintf(stderr, "Reset\n");
} }
continue; continue;
@@ -106,10 +107,20 @@ int preamble_sync_impl::general_work (int noutput_items, gr_vector_int &ninput_i
{ {
case PreambleSlow: case PreambleSlow:
if ((m_word & 0xFF) == 0xCC) if ((m_word & 0xFF) == 0xCC)
{
m_wordSize = 8;
m_dataCount++;
if (m_dataCount == 8)
{ {
m_wordSize = 1; m_wordSize = 1;
m_stateNext = SyncSlow; m_stateNext = SyncSlow;
} }
}
else
{
m_dataCount = 0;
}
break; break;
case SyncSlow: case SyncSlow:
if ((m_word & 0xFF) == 0x3F) if ((m_word & 0xFF) == 0x3F)
@@ -131,11 +142,20 @@ int preamble_sync_impl::general_work (int noutput_items, gr_vector_int &ninput_i
break; break;
case PreambleFast: case PreambleFast:
if ((m_word & 0xFF) == 0xAA) if ((m_word & 0xFF) == 0xAA)
{
m_wordSize = 8;
m_dataCount++;
if (m_dataCount == 32)
{ {
m_wordSize = 8; m_wordSize = 8;
m_dataCount = 0; m_dataCount = 0;
m_stateNext = SyncFast; m_stateNext = SyncFast;
} }
}
else
{
m_dataCount = 0;
}
break; break;
case SyncFast: case SyncFast:
if ((m_word & 0xFF) == fastSyncWord[m_dataCount]) if ((m_word & 0xFF) == fastSyncWord[m_dataCount])