added support for dfrobot firebeetle 2 esp32-e board (#7835)

variants/dfrobot_firebeetle2_esp32e/pins_arduino.h

+#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)?(analogChannelToDigitalPin(p)):-1)
+#define digitalPinToInterrupt(p)    (((p)<40)?(p):-1)
+#define digitalPinHasPWM(p)         (p < 34)
+
+typedef unsigned char uint8_t;
+
+static const uint8_t LED_BUILTIN = 2;
+#define BUILTIN_LED  LED_BUILTIN // backward compatibility
+#define LED_BUILTIN LED_BUILTIN
+
+
+
+static const uint8_t TX = 1;
+static const uint8_t RX = 3;
+static const uint8_t TX2 = 17;
+static const uint8_t RX2 = 16;
+
+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;
+
+static const uint8_t D0 = 3;
+static const uint8_t D1 = 1;
+static const uint8_t D2 = 25;
+static const uint8_t D3 = 26;
+static const uint8_t D4 = 27;
+static const uint8_t D5 = 0;
+static const uint8_t D6 = 14;
+static const uint8_t D7 = 13;
+static const uint8_t D8 = 5;
+static const uint8_t D9 = 2;
+static const uint8_t D10 = 17;
+static const uint8_t D11 = 16;
+static const uint8_t D12 = 4;
+static const uint8_t D13 = 12;
+
+static const uint8_t A0 = 36;
+static const uint8_t A1 = 39;
+static const uint8_t A2 = 34;
+static const uint8_t A3 = 35;
+static const uint8_t A4 = 15;
+static const uint8_t A5 = 35;
+static const uint8_t A6 = 4;
+static const uint8_t A7 = 0;
+static const uint8_t A8 = 2;
+static const uint8_t A9 = 13;
+static const uint8_t A10 = 12;
+static const uint8_t A11 = 14;
+static const uint8_t A12 = 27;
+static const uint8_t A13 = 25;
+static const uint8_t A14 = 26;
+
+static const uint8_t T0 = 4;
+static const uint8_t T1 = 0;
+static const uint8_t T2 = 2;
+static const uint8_t T3 = 15;
+static const uint8_t T4 = 13;
+static const uint8_t T5 = 12;
+static const uint8_t T6 = 14;
+static const uint8_t T7 = 27;
+static const uint8_t T8 = 33;
+static const uint8_t T9 = 32;
+
+static const uint8_t DAC1 = 25;
+static const uint8_t DAC2 = 26;
+
+#endif /* Pins_Arduino_h */