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sr: fx2lafw: Fix multistage trigger 

Multistage triggers currently do no work, because there is a return statement
in the middle of the trigger detector which will be hit as soon as the first
stage in a multistage trigger matches. This patch removes the return statement
so that the trigger detector can continue to try to match the next stage. In
order for this to work we also make sure that the trigger stage is only reset
if the current sample does not match.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
This commit is contained in:
Lars-Peter Clausen 2012-06-21 10:30:38 +02:00 committed by Bert Vermeulen
parent e21e846330
commit f3ab43a8fb
1 changed files with 8 additions and 11 deletions
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19
hardware/fx2lafw/fx2lafw.c
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@ -774,17 +774,14 @@ static void receive_transfer(struct libusb_transfer *transfer)
ctx->trigger_stage = TRIGGER_FIRED;
break;
}
return;
}
/*
* We had a match before, but not in the next sample. However, we may
* have a match on this stage in the next bit -- trigger on 0001 will
* fail on seeing 00001, so we need to go back to stage 0 -- but at
* the next sample from the one that matched originally, which the
* counter increment at the end of the loop takes care of.
*/
if (ctx->trigger_stage > 0) {
} else if (ctx->trigger_stage > 0) {
/*
* We had a match before, but not in the next sample. However, we may
* have a match on this stage in the next bit -- trigger on 0001 will
* fail on seeing 00001, so we need to go back to stage 0 -- but at
* the next sample from the one that matched originally, which the
* counter increment at the end of the loop takes care of.
*/
i -= ctx->trigger_stage;
if (i < -1)
i = -1; /* Oops, went back past this buffer. */