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docs/library/machine.UART.rst: Add details for `invert` parameter.

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Jan 2022-03-03 13:49:06 +01:00 committed by Damien George
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@ -63,6 +63,12 @@ Methods
- *timeout* specifies the time to wait for the first character (in ms).
- *timeout_char* specifies the time to wait between characters (in ms).
- *invert* specifies which lines to invert.
- ``0`` will not invert lines (idle state of both lines is logic high).
- ``UART.INV_TX`` will invert TX line (idle state of TX line now logic low).
- ``UART.INV_RX`` will invert RX line (idle state of RX line now logic low).
- ``UART.INV_TX | UART.INV_RX`` will invert both lines (idle state at logic low).
- *flow* specifies which hardware flow control signals to use. The value
is a bitmask.