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DbgMuxPeer: calculate and check the FCS of Rx frames

fixeria/threads
Vadim Yanitskiy 2022-03-28 04:54:43 +03:00
parent e71875aa12
commit 138af0da7a
1 changed files with 8 additions and 0 deletions
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8
peer.py
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@ -77,6 +77,14 @@ class DbgMuxPeer:
c['TxCount'], c['RxCount'], c['FCS'],
c['MsgType'], c['MsgData'].hex())
# Re-calculate and check the FCS
fcs = DbgMuxFrame.fcs_func(frame[:-2])
if fcs != c['FCS']:
log.error('Rx frame (Ns=%03u, Nr=%03u) with bad FCS: '
'indicated 0x%04x != calculated 0x%04x',
c['TxCount'], c['RxCount'], c['FCS'], fcs)
# TODO: NACK this frame?
# Parse the inner message
c['Msg'] = DbgMuxFrame.Msg.parse(c['MsgData'], MsgType=c['MsgType'])