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C5515 CSL UART Interrupts happen only one time

Hello,

I am working with uart on C5515 eZDSP USB Stick. I use sample code in CSL (ver2.5) and customise it as below:

http://pastebin.com/RmERCNj9

But It seems interrupts occurred only 1 time. For example, I connect the board with a GPS module, the GPS module sends data to the board continuously. But only 1 RX interrupt occurred. Sometime I got a Line Status interrupt with code 99. How to make interrupts work continuously? Thanks.