If i have two serial port in the controller(interfaced 16c550) how to access both using printf library
An idea would be to use the "union" command in ANSI-C. Then You can control a X-dimensional array. You can possibly use a random function or some other function on how to lit the differen t LED:s.You also have to check the different compiler manuals wether they support onions or not.
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Good luck!
"use the 'union' command in ANSI-C"
Why? What would that achieve?
"Then You can control a X-dimensional array"
'C' naturally supports multi-dimensional arrays - unions have nothing to do with it!