cache gpio chip detection when properly initialized #962
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This will prevent falling back to `/dev/gpiochip0` when `/dev/gpiochipX` was previously opened successfully. This is designed to alert users when multiple processes are simultaneously using `/dev/gpiochipX`, but it should only happen if either 1. another process is spamming the gpiochipX. 2. the rare occurrence when RF24 needs to open gpiochipX while it is still used by another process.
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This was just a follow-up to #961 which I should've included there. Hardware tests showed no problems. |
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This will prevent falling back to
/dev/gpiochip0when/dev/gpiochipXwas previously opened successfully.This is designed to alert users when multiple processes are simultaneously using
/dev/gpiochipX, but it should only happen if either