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5a70850b30
Prior to this commit, 9-bit UART data could be specified in the constructor and was transmitted, but the 9th bit was set to 0 when sending, and ignored when receiving. This commit completes 9-bit support in that the 9th bit is taken from the data. 9-bit data has to be provided with `uart.write()` and and read with `uart.read()` as two bytes for each transmitted item, low order byte first. The data length supplied with `uart.write()` and requested by `uart.read()` has to be even, which is checked. The size of the UART buffers will be transparently doubled to cater for 9-bit data. Signed-off-by: robert-hh <robert@hammelrath.com>