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Fastfail if no CV there

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This commit is contained in:
Harald Barth 2020-09-08 10:12:40 +02:00
parent f3ac7fa403
commit 0582d939c5
1 changed files with 8 additions and 3 deletions
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DCC.cpp
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@ -256,9 +256,14 @@ const ackOp PROGMEM READ_CV_PROG[] = {
// each bit is validated against 0 and the result inverted in MERGE // each bit is validated against 0 and the result inverted in MERGE
// this is because there tend to be more zeros in cv values than ones. // this is because there tend to be more zeros in cv values than ones.
// There is no need for one validation as entire byte is validated at the end // There is no need for one validation as entire byte is validated at the end
V0, WACK, MERGE, // read and merge bit 0 V0, WACK, MERGE, // read and merge first tested bit (7)
V0, WACK, MERGE, // read and merge bit 1 etc ITSKIP, // do small excursion if there was no ack
V0, WACK, MERGE, SETBIT,(ackOp)7,
V1, WACK, NAKFAIL, // test if there is an ack on the inverse of this bit (7)
SETBIT,(ackOp)6, // and abort whole test if not else continue with bit (6)
SKIPTARGET,
V0, WACK, MERGE, // read and merge second tested bit (6)
V0, WACK, MERGE, // read and merge third tested bit (5) ...
V0, WACK, MERGE, V0, WACK, MERGE,
V0, WACK, MERGE, V0, WACK, MERGE,
V0, WACK, MERGE, V0, WACK, MERGE,