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esp32/machine_bitstream: Reinstate bitstream bit-bang implementation.

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The bit-bang implementation was replaced with the RMT implementation in
599b61c086.  This commit brings back that
bit-bang code, and allows it to be selected via the new static method:

    esp32.RMT.bitstream_channel(None)

The bit-bang implementation may be useful if the RMT needs to be used for
something else, or if bit-banging is more stable in certain applications.

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George
2022-01-11 17:21:14 +11:00
parent e754c2e84f
commit a3bbd5332b
5 changed files with 119 additions and 9 deletions
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11
docs/library/esp32.rst
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@@ -250,6 +250,17 @@ For more details see Espressif's `ESP-IDF RMT documentation.
new sequence of pulses. Looping sequences longer than 126 pulses is not
supported by the hardware.
.. staticmethod:: RMT.bitstream_channel([value])
Select which RMT channel is used by the `machine.bitstream` implementation.
*value* can be ``None`` or a valid RMT channel number. The default RMT
channel is the highest numbered one.
Passing in ``None`` disables the use of RMT and instead selects a bit-banging
implementation for `machine.bitstream`.
Passing in no argument will not change the channel. This function returns
the current channel number.
Ultra-Low-Power co-processor
----------------------------