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Introduce optional detection of a carrier signal. Immediately "go active"
when edges are seen. "Go inactive" again in the absence of edges in a
specified period of time. Cope with input signals that already had the
carrier removed.
By default carrier detection is disabled, to remain pixel compatible to
the previous implementation. When a carrier frequency is specified and
thus detection is enabled, edges of already filtered input are shifted
by one carrier period, and thus changes the output of the decoder. For
unfiltered inputs that still contain the carrier, detection of activity
is reliable and immediate, but the active phase is extended by one
period of the carrier frequency (which is considered acceptable).
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Move initialization code of protocol decoders from the constructor to a
new reset() helper method. The libsigrokdecode backend could run this
method several times to clear the decoder's internal state, before new
data from another acquisition gets fed to decode() calls.
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This replaces the fixed timing margin with a percentage based tolerance
to better allow for timing inaccuracies, especially for longer timings
like the Leader and Repeat codes.
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This allows frontends to set the assumed initial pins (i.e., the assumed
state of the pins before the first sample of a capture) to user-specified
values.
The assumed initial pins can be either low, or high, or "use same value
as the first sample of the capture".
The special self.initial_pins decoder attribute is now removed.
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Remove the FSF postal address as it might change (it did in the past).
Reference the gnu.org website instead which is more stable.
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The previous **kwargs some PDs had is not actually ever used, so drop it.
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- No newlines at the end of files.
- No trailing ';' characters.
- Comparison with None: Use 'is None' or 'is not None'.
- Comparison with True/False: Use 'if cond:' or 'if not cond:'.
- Various minor whitespace fixes.
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Also, use the "if not self.samplerate" form, which catches both the case
where self.samplerate is None, as well as the case where it is 0.
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In all current PDs it is not necessary to raise an exception upon
invalid states (of the PD's state machine), since we can guarantee that
no such invalid state can ever be reached in these PDs.
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Older libsigrokdecode versions are no longer able to use the current
versions of the PDs (various changes in syntax etc).
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Variables of type 'struct srd_channel *' are consistently named 'pdch' to
make them easily distinguishable from libsigrok's 'struct sr_channel *'
variables that are consistently named 'ch'.
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Also show the AGC field(s) and pauses, the stop bit, and the individual
address / address# and command / command# fields.
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The timing of the protocol is not really configurable, valid data in
this protocol must always adhere to the same timing parameters, making them
configurable should not be needed.
Also: Only check for the "interesting" edges and simplify the code a bit.
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This IR protocol is commonly referred to as "the NEC protocol", and can be
generated by various means (not only via the NEC µPD6121/µPD6122 ICs).
Drop some unneeded variables and fix/simplify the code a bit.
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