[Silicon Labs] Fix regression towards older platforms#1504

Merged

0xc0170 merged 1 commit intoARMmbed:masterfrom stevew817:feature/fix/serial_NC

Jan 15, 2016

+69-90

Commits on Jan 15, 2016

Fix regression towards older platforms (did not have RXBLOCK set, resulting in receiving characters even with RX set to NC) by condensing code.
stevew817
committed