You can now send any key (that will be interpreted as a command) to stop a sweep.
Bug fix: Correct the C command's setting of the immediate frequency.
Allow the settle delay to be configured with the D command, default is 10ms.
Extract reset DDS code to its own function.
Reset the DDS at the end of a scan.
Add the R command to reset the DDS.
Add the V command to read the comparator voltages.
Add the Q command to list the command set.