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extmod/modonewire: Adopt Maxim recommended read timings.
The timing of the onewire module was way too fast when reading. This commit adopts read timings as recommended in Maxim application note 126: 6 us (pulse) / 9 us (sample) / 55 us (bit slot). See also: https://www.analog.com/en/technical-articles/1wire-communication-through-software.html Signed-off-by: Damien George <damien@micropython.org>
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