Great that you realized your project. Always nice when somethings works as planned right?
In most cases segmented displays are controlled by a timer interrupt that updates the display but i see you did it in the main code which is also an option.
Code looks well. Maybe you can use English comments so everybody understands it better. And a circuit of the electronics will make things more clear for others too.
There is the str2digits that could have been used.
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