control loop running on summit, 1 seg

The control loop is running on the summit for the first time. Since only one segment is active, this is a trivial configuration: there are no active sensors, the control calculations don't make any sense, etc. But, the software is running and is being driven by DLP arrival.

• Since there is no sensor feedback, there is no indication that the loop is running other than that the scheduler state is cycling. Must log some kinda periodic health info.
  
  
• There is no direct, positive indication that DLPs are intact, only indications on error. Should periodically log DLPs in hex.