- Fix: pinModeAlt mode argument is cheked in (FSEL_INPT, FSEL_OUTP, FSEL_ALT0, FSEL_ALT1, FSEL_ALT2, FSEL_ALT3, FSEL_ALT4, FSEL_ALT5)
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- Fix: sn3218Setup is a function
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- Update: documentation
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- Add: export of WPI_MODE_GPIO_SYS constant
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- Add: export of WPI_MODE_GPIO_PIFACE constant
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- Add: export of WPI_MODE_GPIO_UNINITIALISED constant
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- Add: wiringPiI2CClose
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- Add: wiringPiSPIClose
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