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The input signal's polarity ('active' variable) is strictly local to the
decode() method. The 'count' becomes obsolete when 'data' is kept in a
Python list. Conversion of bit patterns to numbers is provided by common
helpers. Alpha-sort Python imports while we are here.
This commit also renames a few variables in the normal/inverted check
for valid input data. Which can help the introduction of support for the
extended protocol, by decoupling what gets checked and what gets shown.
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Eliminate redundancy in the check for database entries of button events.
Tighten the check for valid address and command bit patterns. The former
implementation did something unexpected, wanted the AND of the first and
second 8bit patterns to become zero. But the second 8bit item has not yet
become available when the test runs after the reception of the first 8bit
item. So the test happened to "pass" unexpectedly in intermediate steps,
and failed to catch invalid input data when all fields became available.
Unfortunately the check for valid data and the emission of annotations
was combined in the implementation. So it's essential to keep running
the "check" routine to get the annotations, and update internal ss/es
state. But only emit warnings when the check fails after all involved
data became available. Check for strict XOR as per the protocol spec.
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The metadata() method unconditionally referenced the samplerate even
though the value is only available conditionally. Move the references to
a location after the samplerate presence check.
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Eliminate magic numbers, use symbolic names for annotation classes and
pin numbers. Also vertically align text variants for zoom levels in the
more complex cases, to simplify maintenance. Prefer .format() calls to
improve readability in the more complex invocations.
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Only add items to 'outputs' if the respective PD actually has
OUTPUT_PYTHON support implemented as of right now.
Various decoders might get OUTPUT_PYTHON support later, but the
'outputs' field should reflect the current status.
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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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