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why does the Device 1 receive 5 bytes data when Device 2 sent 1byte data In the SWRC088C sample project

Other Parts Discussed in Thread: CC2531

Hi all 

 i using the SWRC088C sample project to test the CC2531 USB CDC transmit data (via UART)

but  when Dev 1 sent 1byte to Dev2 ,  Dev2 receive 5bytes !!!