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Implement the api declared in mbed-os/hal/gpio_api.h. You must define the struct gpio_t. This struct is commonly defined in an objects.h file within the mbed-os/targets/TARGET_VENDOR/, mbed-os/targets/TARGET_VENDOR/TARGET_MCU_FAMILY or mbed-os/targets/TARGET_VENDOR/TARGET_MCU_FAMILY/TARGET_MCUNAME directories.

You should define the GPIO names for LEDs and switches in PinNames.h as defined in the porting guide for pin names here.

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