arduino-esp32/variants/fm-devkit/pins_arduino.h

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#ifndef Pins_Arduino_h
#define Pins_Arduino_h
#include <stdint.h>
#define EXTERNAL_NUM_INTERRUPTS 16
#define NUM_DIGITAL_PINS 40
#define NUM_ANALOG_INPUTS 16
#define analogInputToDigitalPin(p) (((p)<20)?(esp32_adc2gpio[(p)]):-1)
#define digitalPinToInterrupt(p) (((p)<40)?(p):-1)
#define digitalPinHasPWM(p) (p < 34)
static const uint8_t TX = 1;
static const uint8_t RX = 3;
// IO
static const uint8_t LED_BUILTIN = 5;
static const uint8_t SW1 = 4;
static const uint8_t SW2 = 18;
static const uint8_t SW3 = 19;
static const uint8_t SW4 = 21;
//I2S DAC
static const uint8_t I2S_MCLK = 2; // CLOCK must be an integer multiplier of SCLK
static const uint8_t I2S_LRCLK = 25; // LRCLK
static const uint8_t I2S_SCLK = 26; // SCLK - Fs (44100 Hz)
static const uint8_t I2S_DOUT = 22; // DATA
//GPIO
static const uint8_t D0 = 34; // GPI - Input Only
static const uint8_t D1 = 35; // GPI - Input Only
static const uint8_t D2 = 32; // GPO - Output Only
static const uint8_t D3 = 33; // GPO - Output Only
static const uint8_t D4 = 27;
static const uint8_t D5 = 14;
static const uint8_t D6 = 12;
static const uint8_t D7 = 13;
static const uint8_t D8 = 15;
static const uint8_t D9 = 23;
static const uint8_t D10 = 0;
// I2C BUS, 2k2 hardware pull-ups
static const uint8_t SDA = 16;
static const uint8_t SCL = 17;
// SPI - unused but you can create your own definition in your sketch
static const int8_t SCK = -1;
static const int8_t MISO = -1;
static const int8_t MOSI = -1;
static const int8_t SS = -1;
#endif /* Pins_Arduino_h */