CODEWITHSUNDEEP
c++microcontroller
Patrick Schmelzer
Patrick Schmelzer

Reputation: 66

c++ microcontroller global classes/singelton?

I am currently using C++ on a microcontroller and I am having an issue where I don't know what the proper implementation is:

I am for example using an serial interface class which takes care of configuring the serial port (setting baud, data bits...). Since I only want to do it at the initialization phase of my MCU at the start, I don't know how to handles this with classes.

Shall I make a global class/singleton which I create at the initialization phase (in this way I can keep my serial parameters) or shall i create a class everytime I need to use the serial interface (but this would reopen my serial line - or do I leave the constructor empty)?

Thanks a lot in advance.

Upvotes: 0

Views: 148

Answers (2)

Solomon Slow
Solomon Slow

Reputation: 27115

I try to avoid global variables and singletons.

I defined a class with a constructor that accepts a pathname and configuration to open the port, and a destructor that closes the port. Then, I declared a static local instance of it in main(...) and I passed references to it in to the constructors of other classes that needed to use the port.

Passing the reference around (as opposed to declaring a global instance, or a global function to get a singleton) is what enabled me to write unit tests for the other classes in which the tests passed in a references to mock serial port objects.

Upvotes: 2

Yuval Ben-Arie
Yuval Ben-Arie

Reputation: 1290

You are asking for opinions because all options are valid.
I do believe creating a singleton to store the configuration and resources needed is a good approach. This way you can implement RAII idiom, and gain easy access when needed.

Upvotes: 1

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