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Extend 10Base-T decoder to catch wide eye at the beginning of the preamble of TX frames #1114

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Extend 10Base-T decoder to catch wide eye at the beginning of the preamble of TX frames #1114

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8 changes: 7 additions & 1 deletion scopeprotocols/Ethernet10BaseTDecoder.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,8 @@ void Ethernet10BaseTDecoder::Refresh(

const int64_t eye_start = ui_halfwidth - jitter_tol;
const int64_t eye_end = ui_halfwidth + jitter_tol;
const int64_t eye_wide_start = ui_width - jitter_tol;
const int64_t eye_wide_end = ui_width + jitter_tol;

size_t i = 0;
bool done = false;
Expand Down Expand Up @@ -150,7 +152,11 @@ void Ethernet10BaseTDecoder::Refresh(
i++;
break;
}
if( (delta < eye_start) || (delta > eye_end) )
// Normal eye for first bit in RX frame (from the network)
bool in_normal_eye = (delta >= eye_start) && (delta <= eye_end);
// Wide eye for first bit in TX frame (from the NIC)
bool in_wide_eye = (delta >= eye_wide_start) && (delta <= eye_wide_end);
if(!in_normal_eye && !in_wide_eye)
{
LogTrace("Edge was in the wrong place, skipping it and attempting resync\n");
i++;
Expand Down