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Close #4293 by changing `..note::` to `.. note::`.
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* Always clear the peripheral interrupt so we don't hang when full
* Store the ringbuf in the object so it gets collected when we're alive
* Make UART objects have a finaliser so they are deinit when their
memory is freed
* Copy bytes into the ringbuf from the FIFO after we read to ensure
the interrupt is enabled ASAP
* Copy bytes into the ringbuf from the FIFO before measuring our
rx available because the interrupt is based on a threshold (not
> 0). For example, a single byte won't trigger an interrupt.
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- add internal buffering
- rtc initialization fix
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Greater that 100khz is technically out of the original spec.
Background here: https://github.com/adafruit/Adafruit_CircuitPython_CLUE/issues/36
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Fixes #2082
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Add busio support for the ESP32-S2
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Testing performed: That a card is successfully mounted on Pygamer with
the built in SD card slot
This module is enabled for most FULL_BUILD boards, but is disabled for
samd21 ("M0"), litex, and pca10100 for various reasons.
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Also copy some notes from busio docstrings to bitbangio docstrings
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Add support for a debug console, such as ST-Link VCP.
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Ujson should only worry about whitespace before JSON. This becomes apparent when you are using MP stream protocol to read directly from input buffers.
When you attempt to read(1) on a UART (and possibly other protocols) you have to wait for either the byte or the timeout.
Fixes:
- Waiting for a timeout after you have completed reading a correct and complete JSON off the input.
- Raising an OSError after reading a correct and complete JSON off the input.
- Eating more data than semantically owned off the input buffer.
- Blocking to start parsing JSON until the entire JSON body has been loaded into a potentially large, contiguous Python object.
Code you would write before:
```
line = board_busio_uart_port.read_line()
json_dict = json.loads(line)
```
or reaching for fixed buffers and swapping them around in Python.
Code that did not work before that does now:
```
json_dict = json.load(board_busio_uart_port)
```
- This removes the need for intermediate copies of data when reading JSON from micropython stream protocol inputs.
- It also increases total application speed by parsing JSON concurrently with receiving on boards that read from UART via DMA.
- It simplifies code that users write while improving their apps.
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Surely readline() "rtype" is string not int as stated (and not bytes as some might expect).
Also it is not totally unambiguous what happens on a timeout so it would help to clarify in docs that on a timeout
it does NOT return with what it has read so far, rather it leaves all that in the buffer ready for a future read and returns nothing.
Likewise clarify that if timeout=0 but there is no newline it DOES return what it has read so far (NOT None).
At least this is what I think it does and/or is supposed to do!
Python docs are generally not too explicit about what is the proper treatment, so perhaps all the more reason to
clarify the interpretation adopted?
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