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Design

Logical Layout

Software Components

Commanding

  • Needs to support sending FSW file system commands
  • Needs to support loading and running BASIC scripts
Questions:
  • How should commands be defined?

Telemetry

  • dramsgse should store the received telemetry into test directory archives (TID)
  • Telemetry mnemonics will be defined via an Excel sheet and then exported to CSV text files
  • The most recent telemetry menmonic values (CVT) should be accessible from BASIC

Interfaces

  • What main interface does dramsgse need to support?
  • Does dramsgse need to support any custom interfaces?

Simulators

Several applications have been created to simulate various parts of the system, and these simulators can be put together in various ways. Portions can even be swapped out for actual hardware when necessary.

The major components (applications) are:

  • CFSIM
  • DramsDevSim
  • HiDra
  • LanderSim
  • LaserClient/VhClient
CFSIM

The ColdFire Simulator (CFSIM) is a software emulator that can run a Flight Software (FSW) image or a bootloader image. It has been built to simulate the MOMA Command & Data Handling (C&DH) board. DraMS is using the MOMA board for initial development of the FSW until a DraMS board is available. An ancillary application (qterm) is also included that can send/receive data from the Debug UART through a terminal-like interface.

The CFSIM has a Spacewire (CMD/TLM) interface (TCP ports 27014 and 27015) and can connect to "peripherals" (TCP ports 4000-4003). There is also a Debug UART that is connected to a named pipe ("/dev/uart"). These peripherals are currently mapped as follows:

  • LASER (port 4000)
  • GC (port 4001) (NOTE: Used for the VH in DramsDevSim)
  • MAIF (port 4002)
  • SEB (port 4003)
DramsDevSim

This application is a collection of simulators for the LEU (Laser), Valve/Heaters (VH), Pressure/Temp (PT), and MS (Mass Spectrometer) instrument boards. These can be connected via a serial or TCP connection to either the CFSIM or to an actual C&DH. These simulators can receive commands and generate telemetry that is very similar to actual hardware.

HiDra (HI DRAgonfly)

This application merges the functionality of the DramsGSE and the LanderSim. It connects directly to the Spacewire ports (27014/27015) and can send and receive data directly to the C&DH. This application was built for early development of the FSW and is used mostly by the FSW developer (Micah Johnson) or for FSW testing (Raj Roy).

LanderSim

The LanderSim receives ITF packets from the ground (DramsGSE) and routes them to the Spacewire Bus (and this to the Drams C&DH). Spacewire telemetry packets received from the instrument(s) (i.e., DraMS C&DH) are sent to the ground as ITF packets. The LanderSim also generates a once-per-second Time & Status packet that is sent to all instruments.

LaserClient/VhClient

These "client" applications were created to test the various simulators included in the DramsDevSim. They can be useful for creating the raw command packets for the various instruments.

Logical Layout

The simulators above can be set up in several different configurations, and paired with actual hardware where possible.

Full System Layout (Software only)

Hybrid System Layout (Software and Hardware)

DramsGSE -> Microtel SW Box -> C&DH -> DramsDevSim

Subsystem Setups

Hidra -> C&DH -> DramsDevSim

VhClient -> DramsDevSim LaserClient -> DramsDevSim

Hidra -> C&DH (CFSIM or actual hardware)

Viewing Data

  • dramsdataview
    • Provides custom views of the data
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