Ard. mega; uart RX1 (19200bps) +uart RX2 (19200bps) = Uart TX4 (56000bps)

Projects Programming
1

Hello,
I simply need to merge two ascii characters streams into one output stream. I have Arduino Mega which has 4 uarts.
When merged I woud use PC to store output to a file.
The target is a simple datalogger.

Input would be:
1/ at uart1 rx
"xxxxxx\n"
"xxxxxx\n"
"xxxxxx\n"
.. never ending repeat
2/ at uart2 rx
"yyyyyyyyyyyyyyy\n"
"yyyyyyyyyyyyyyy\n"
... never ending repeat

The sentece "x" and "y" are variable length and can be long up 600-800 chars.

3/ I would like to get output at uart4 tx like:
"xxxxxx\n"
"xxxxxx\n"
"yyyyyyyyyyyyyyy\n"
"xxxxxx\n"
... never ending repeat, the order of sentences "x" and "y" doesn't matter.

Please would you advice me how to do it...
Thank you in advance

2

So are you saying..

Read and store lines of data from serial 1 and serial 2 e.g into two separate arrays

When array 1 has at least 2 lines and array 2 has at least 1 line

Output array 1 line 1. Array 1 line 2. Array 2 line 1. To serial 3

Then loop back and start again.

I can see issues if the data arriving on serial 1 and serial 2 is not synchronised in some way, as you will end up with too much data in either array 1 or array 2, e.g over a long period of time.

Is there some sort of flow control on the input data.