# GPIO Control QMK has a GPIO control abstraction layer which is microcontroller agnostic. This is done to allow easy access to pin control across different platforms. ## Functions The following functions can provide basic control of GPIOs and are found in `quantum/quantum.h`. |Function |Description | |----------------------|------------------------------------------------------------------| |`setPinInput(pin)` |Set pin as input with high impedance (High-Z) | |`setPinInputHigh(pin)`|Set pin as input with build in pull-up | |`setPinInputLow(pin)` |Set pin as input with build in pull-down (Supported only on STM32)| |`setPinOutput(pin)` |Set pin as output | |`writePinHigh(pin)` |Set pin level as high, assuming it is an output | |`writePinLow(pin)` |Set pin level as low, assuming it is an output | |`writePin(pin, level)`|Set pin level, assuming it is an output | |`readPin(pin)` |Returns the level of the pin | ## Advanced Settings Each microcontroller can have multiple advanced settings regarding its GPIO. This abstraction layer does not limit the use of architecture-specific functions. Advanced users should consult the datasheet of their desired device and include any needed libraries. For AVR, the standard avr/io.h library is used; for STM32, the ChibiOS [PAL library](http://chibios.sourceforge.net/docs3/hal/group___p_a_l.html) is used. d=015f62d05b35466a6fbb5f33370d9615e028f9f0'>diffstats
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