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The previous implementation used the fact that libsigrok's internal API
happens to use the first letter of the user visible English option text.
Two locations mapped edge choices to API literals in different ways.
Unify them, introduce an explicit option text to literal value mapping.
(Many if not all decoder implementations do that. More adjustment to use
common code could be beneficial.)
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Allow configuration of the 'reset' signal polarity. Reset counters on
either falling (default) or rising edges.
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Also, add long and short annotation string versions.
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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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