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Update reference.rst

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Add flush() method.
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Develo
2020-08-13 15:17:47 -04:00
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@ -172,6 +172,9 @@ to the FIFO, but that doesn't mean that all bytes have been sent out through the
The ``::read()`` call does not block if there are no bytes available for reading.
The ``::readBytes()`` call blocks until the number of bytes read complies with the number of
bytes required by the argument passed in.
The ``::flush()`` call blocks waiting for the FIFO to be empty before returning. It is recommended
to call this to make sure all bytes have been sent before doing configuration changes on the serial
port (e.g. changing baudrate) or doing a board reset.
``Serial`` uses UART0, which is mapped to pins GPIO1 (TX) and GPIO3
(RX). Serial may be remapped to GPIO15 (TX) and GPIO13 (RX) by calling