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getting data from the uart to to variable

hello, i am new to the stellaris launchpad,

i want to make an spi sniffer controlled by the uart.

i tried to make the example program Uart Echo to store the input in order to get simple commands, but i couldn't understand how to make it store the input reccived by the uart.

can you help me with this? i hope that i will be able to deal with the SPI interface.