add function to set baudrate

it will set the GCLK as SERCOM core clock with the lowest baud
rate error and set the closest baud rate in the SERCOM peripheral.

Change-Id: I01db273f4c8170a4942049653c575010b93296ce
1 file changed
tree: 1a78cad664f8986c391724132b36f41cb0e05a8a
  1. ccid/
  2. contrib/
  3. sysmoOCTSIM/