arduino-esp32/variants/espea32/pins_arduino.h

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#ifndef Pins_Arduino_h
#define Pins_Arduino_h
#define EXTERNAL_NUM_INTERRUPTS 16
#define NUM_DIGITAL_PINS 40
#define NUM_ANALOG_INPUTS 18
#define analogInputToDigitalPin(p)
#define digitalPinToInterrupt(p) (((p)<40)?(p):-1)
#define digitalPinHasPWM(p) (p < 34)
#define LED_BUILTIN 5
static const uint8_t SDA = 21;
static const uint8_t SCL = 22;
static const uint8_t SS = 5;
static const uint8_t MOSI = 23;
static const uint8_t MISO = 19;
static const uint8_t SCK = 18;
#endif /* Pins_Arduino_h */