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This decoder just counts the number of falling and/or rising edges. This
is especially useful for diagnosing protocols with a clock signal or a
fixed number of transitions per bit, e.g. pulse length coded.
It also provides a divider, which can be used to e.g. count the number
of words in I²C or SPI transfers.
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Print all annotations for individual data bit items and for the
de-multiplexed words in a consistent style with leading zeros and
constant width. This shall lend itself better to quick navigation
during visual inspection, as well as automatic processing.
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The previous implementation prepared but never fully enabled the
accumulation of several multi-bit items into words that span multiple
bus cycles (think: address or data de-multiplexing on memory busses).
Complete the accumulation, and fixup the end samplenumber for word
annotations. Fixup the endianess logic (the condition was inverted).
Rephrase calculation to be more Python idiomatic.
Default to word size zero, and only emit word annotations for non-zero
word size specs. This keeps the implementation backwards compatible and
still passes the test suite. Default behaviour is most appropriate for
interactive use in GUI environments, while automated processing will
find consistent behaviour across all setups (non-multiplexed busses, and
multiplexed busses with "words" that span one or multiple cycles).
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Cope when users only provide e.g. input lines D0 and D2 to the parallel
decoder. Assume that not-connected pins are "always zero".
Rephrase the .decode() logic which determines .wait() conditions while
we are here, to slightly unobfuscate the implementation.
This fixes bug #1088.
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Remove the redundant .itemcount variable, which exactly corresponds to
the length of the .items array.
Arrange retrieval of options and their evaluation closer to each other
for improved readability.
Use common logic to construct "words" from several multi-bit "items".
Arrange for endianess support by optionally reversing the array before
traversal.
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Instead of implementing two main loops for operation in the presence and
in the absence of a clock line, use a common main loop which operates on
pre-determined wait conditions.
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The list of a dictionary's keys need not reproduce in identical order
everywhere. Make sure to run all start-of-packet sequence checks in the
decoder implementation in a specific order on each machine, such that
annotations get emitted with identical content and in the same order for
each execution of the decoder.
This fixes the remaining part of bug #1090.
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Use the dictionary's .get() method in combination with a default result
parameter, instead of an explicit "k in dictvar" test and a conditional
assignment.
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Annotations of the USB power delivery decoder contain multiple text
fragments that correspond to several flags in bit fields. The Python
runtime did not guarantee an order of emission and made the test suite
fail.
Sort the order in which RDO and PDO flags related text fragments get
constructed and concatenated. Print text for higher bit positions first
as this might feel more intuitive to users.
This fixes part of bug #1090.
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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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The ssi32 decoder implements a reset() method which clears internally
accumulated data during decoding. Rename the method before all decoders
will grow a new reset() method that will be used for a different purpose.
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The mrf24j40 decoder implements a reset() method which clears internally
accumulated data during decoding. Rename the method before all decoders
will grow a new reset() method that will be used for a different purpose.
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The ade77xx decoder implements a reset() method which clears internally
accumulated data during decoding. Rename the method before all decoders
will grow a new reset() method that will be used for a different purpose.
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The decoder's .reset() method seems to partially implement constructor's
assignments, but is not referenced anywhere. There is neither a direct
call site in the remainder of pd.py which uses the "reset" name, and
runtime computation only references "handle_*()" methods for commands
and responses.
Drop the unused .reset() method in the individual decoder before the
introduction of a common .reset() method approach for all decoders.
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The am230x decoder implements a reset() method which clears internal
decoder state. Rename the method before all decoders will grow a new
reset() method that will be used for a different purpose.
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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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Using the format string 'I' with the default (implied) prefix '@'
results in both word size and endianness being platform dependent.
In this case standard size (32 bits) and little endianness is
required, so the prefix '<' needs to be used.
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This fixes (parts of) bug #1019.
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According to the USB 2.0 spec, 8.5.3.4, a protocol stall condition lasts
until the next SETUP transfer. On reception of the SETUP, adjust the end
sample accordingly, and flush the previous CONTROL transfer.
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Check for falling edges (i.e. changes to dominant state) between bits of
a CAN frame, and adjust subsequent bit slots' sample points accordingly.
This is a simple implementation which could get improved later. But it
improves the decoder's reliability when the input signal's rate differs
from the nominal rate.
This fixes bug #990.
Reported-By: PeterMortensen via IRC
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Consistently use .sample_point for the member variable that corresponds
to the 'sample_point' property. Use 'samplenum' in .get_sample_point()
to reflect that the routine returns a sample number. This eliminates the
'bitpos' identifier which was used for two different things.
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Make obvious that the start bit's value is 1 in the IDLE stage.
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The 'fields' table of state and descriptions is not fully populated,
some slots are missing. Cope with lookup misses when unexpected input
data is not found in the table. Use different error text in annotations
for described but invalid states (the previous implementation used
"reserved / invalid"), and for states that are not described in the
table (introduce the "reserved / unknown" text for conditions that are
not covered by the decoder implementation).
The previous implementation missed the emission of some warnings. When a
"reserved / invalid" description was found, the subsequent exact match
for "reserved" failed and the warning was not emitted. Weaken the test
to emit warnings for either description that has "reserved" in it,
regardless of whether the text was found in the table or is not part of
the table at all.
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Annotations generated by the onewire_network decoder started where bit 1
began, while it should align with the start of bit 0.
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Getting the first edge outside of the loop in .decode() greatly
simplifies the logic, any other edge then is just an update of the
previously collected data, determined by always equal code.
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The previous implementation of the I2C decoder used to retrieve and not
process the first sample of the input stream. Remove this instruction.
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Telling .wait() to "skip one sample" slightly obfuscates the intent of
getting the next samples while no condition applies. Explicitly pass no
condition arguments instead, to better reflect the purpose. Coincidently
these .wait() calls will execute in slightly less expensive code paths
in the common code.
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Rephrase how the 'WAIT IDLE' stage skips over all-low input signals.
Have the next high level on either line detected in common code.
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Do reference the period's start and end sample numbers when the
duty cycle is written to the binary output stream. The previous
implementation inappropriately used the period counter instead.
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Move more items from the Python object's members to local variables of the
decode() method, as they are used there exclusively.
Mark a spot where the binary output references suspicious "sample numbers".
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With the simplicity of PWM waveforms and the convenience of the v3 API,
there is no need to maintain internal state. After the start of the
first period was determined based on the input signal's polarity, any
period is defined by just the next two edges, and the next period is
immediately to follow.
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This is not really relevant for stacked PDs currently (they can be used
unmodified with either PDv2 or PDv3 low-level decoders), but it'll allow
us to drop PDv2 support completely.
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