I use buffered serial data on m2560 with 4 uarts. and it never gave a problem.
But the problem seems to be the INPUT.
When a new feature is added, like config input, i sometimes add such a feature to one device. Like the first UART.
When nobody uses such a function there is not much point in wasting time so when users request the functionality for other hardware, i add it. And otherwise only one device has some more functionality than others.
Not a problem when it is mentioned in the help.
In this case the HELP was not correct : for some reason all the UARTS were added instead of just INPUT1.
Maybe it was done when the help was updated for the xmega.(xmega supports it on all channels)
I found this note in the history : NOTE : THIS works only for UART0. When we get positive feedback about this opion it will be added to other UARTS as well
The normal INPUT just looks for CR. Not a problem when a LF is following. But when you buffer all data, this is a problem when the sender can not send just an LF.
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