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add caveat about software RS485 implementations

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This commit is contained in:
Dan Halbert 2022-05-04 13:05:34 -04:00
parent 6378343bb3
commit 75bfcb3630
1 changed files with 6 additions and 1 deletions
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7
shared-bindings/busio/UART.c
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@ -63,7 +63,12 @@
//| :param int receiver_buffer_size: the character length of the read buffer (0 to disable). (When a character is 9 bits the buffer will be 2 * receiver_buffer_size bytes.) //| :param int receiver_buffer_size: the character length of the read buffer (0 to disable). (When a character is 9 bits the buffer will be 2 * receiver_buffer_size bytes.)
//| //|
//| *New in CircuitPython 4.0:* ``timeout`` has incompatibly changed units from milliseconds to seconds. //| *New in CircuitPython 4.0:* ``timeout`` has incompatibly changed units from milliseconds to seconds.
//| The new upper limit on ``timeout`` is meant to catch mistaken use of milliseconds.""" //| The new upper limit on ``timeout`` is meant to catch mistaken use of milliseconds.
//|
//| .. note:: RS485 support on i.MX and Raspberry Pi RP2040 is implemented in software.
//| The timing for the ``rs485_dir`` pin signal is done on a best-effort basis, and may not meet
//| RS485 specifications intermittently.
//| """
//| ... //| ...
//| //|
typedef struct { typedef struct {