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5 changes: 5 additions & 0 deletions cores/arduino/pins_arduino.h
Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,11 @@ _Static_assert(LastPort <= 0x0F, "PortName must be less than 16");
_Static_assert(NUM_ANALOG_INPUTS <= MAX_ANALOG_INPUTS,
"Core NUM_ANALOG_INPUTS limited to MAX_ANALOG_INPUTS");

/* Alias USER_BTN when available */
#if defined(USER_BTN) && !defined(BUTTON_BUILTIN)
#define BUTTON_BUILTIN USER_BTN
#endif

/* Default for Arduino connector compatibility */
/* SPI Definitions */
#ifndef PIN_SPI_SS
Expand Down