If you don't have the ability of changing the stream, a solution is to
ignore hardware USART and making one by software

In the stream, there will be some characters, or some chain of
characteres you can recognize.
First, I will connect the RX to a portB pin, and activate the int_portb.
Second, i will use a timer to count the number of 0 or 1 between each
trig of the int_portb
The int portb will "construct" a chain of 0-1. let's go to 30bit. This
chain will contain all the startbit, data bit, parity bit and stop bit
in this order.
The third phase is to "analyse" this chain in order to know where are
the start and stop bit.

If your stream contains only (or mainly) alphanumeric characters, it
will be easier
If your stream contains parity bit, it will be more easier.

Once you have find that, you can start the hardware USART between the
stop and the start bit.

Do you have more info about your stream: baud rate, format (7, 8 or 9
bit) and his content....


Sam

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