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Hi,
If the USB part of the cc2531 won't be in use, you may leave the project untouched, and
download the FW as is.
However if you are willing to use the USB peripheral of CC2531 then you should replace
the "HAL" part of the project with the "HAL" suited for CC2531. There are several threads
on the forum discussing this issue.
OK,
But, these HAL changes are made for using the USB as a UART port for data communication with a PC for example?
BRS,