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Spec_ComponentBase.md

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Specification of Component class

1. Overview

1. Functions

  • The Component class is an abstract class to handle the electrical power and the update timing of components.
  • This class has two virtual functions: MainRoutine and FastUpdate. Both are called periodically. Users can select the functions according to the required calling period.
    • The MainRoutine function is the components' main function. Most of the processing is handled in this function.
    • The FastUpdate function handles the processes that need to be computed in a high-speed cycle. So, users will use this function only when high-frequency disturbances need to be calculated (e.g., RW jitter).

2. Related Files

  • Main file: component.hpp, component.cpp

3. How to use

  • Inherit this class by the user's component class.
  • The ReactionWheel in S2E_CORE is useful as a usage example of the FastUpdate.

2. Explanation of Algorithm

1. Constructor

1. overview

  • Users can set component update prescaler and power port.

2. inputs

  • prescaler
    • prescaler determines the execution cycle of the MainRoutine function.
    • The period of MainRoutine equals to SimTime::compo_update_interval_sec $\times$ prescaler.
  • clock_gen
    • clock_gen is an instance that simulates the clock of a component.
    • Users do not need to care about this.
  • power_port
    • power_port is an instance that simulates the power supply
  • fast_prescaler
    • fast_prescaler determines the execution cycle of the FastUpdate function.
    • The period of FastUpdate equals to SimTime::compo_update_interval_sec $\times$ fast_prescaler.
    • If you don't need to use FastUpdate, you don't need to specify this (it is set to 1 by default).

3. algorithm

  • N/A

4. note

  • N/A

2. MainRoutine

1. overview

  • Components' main function

2. inputs

  • time_count
    • time_count is incremented each time the Tick function is called.
    • Users can use this timing information when they need for their components.

3. algorithm

  • N/A

4. note

  • All the components have to override the MainRoutine function.

3. FastUpdate

1. overview

  • This function handles the processes that need to be computed in a high-speed cycle.

2. inputs

  • N/A

3. algorithm

  • N/A

4. note

  • FastUpdate function is not a pure virtual function, so components without fast calculation do not need to override this function.
  • As explained in the FastTick section, ITickable::needs_fast_update_ flag must be true to call FastUpdate. So, if users want to use FastUpdate, call ITickable::SetNeedsFastUpdate(true) in the constructor of each component.

4. Tick

1. overview

  • This function executes MainRoutine.
  • ClockGenerator class calls this function.

2. inputs

  • count
    • count is incremented each time the Tick function is called.

3. algorithm

  • Execute MainRoutine when the count is divisible by the prescaler. By this mechanism, the execution period of MainRoutine is divided.

4. note

  • N/A

5. FastTick

1. overview

  • This function executes FastUpdate.
  • ClockGenerator class calls this function.

2. inputs

  • count
    • count is incremented each time the FastTick function is called.

3. algorithm

  • Execute FastUpdate when the count is divisible by the fast_prescaler. By this mechanism, the execution period of FastUpdate is divided.

4. note

  • ITickable::needs_fast_update_ flag must be true to call FastUpdate. So, if you want to use FastUpdate, call ITickable::SetNeedsFastUpdate(true) in the constructor of each component.

3. Results of verifications

  • N/A

4. References

  • N/A