Add support for DFRobot ESP32 C3

Author: doskoi

Diff for: variants/beetle32c3/pins_arduino.h

@@ -0,0 +1,35 @@
+#ifndef Pins_Arduino_h
+#define Pins_Arduino_h
+
+#include <stdint.h>
+
+#define EXTERNAL_NUM_INTERRUPTS 22
+#define NUM_DIGITAL_PINS        22
+#define NUM_ANALOG_INPUTS       6
+
+#define analogInputToDigitalPin(p)  (((p)<NUM_ANALOG_INPUTS)?(analogChannelToDigitalPin(p)):-1)
+#define digitalPinToInterrupt(p)    (((p)<NUM_DIGITAL_PINS)?(p):-1)
+#define digitalPinHasPWM(p)         (p < EXTERNAL_NUM_INTERRUPTS)
+
+static const uint8_t LED_BUILTIN = 10;
+#define BUILTIN_LED  LED_BUILTIN // backward compatibility
+
+static const uint8_t TX = 21;
+static const uint8_t RX = 20;
+
+static const uint8_t SDA = 8;
+static const uint8_t SCL = 9;
+
+static const uint8_t SS    = 7;
+static const uint8_t MOSI  = 6;
+static const uint8_t MISO  = 5;
+static const uint8_t SCK   = 4;
+
+static const uint8_t A0 = 0;
+static const uint8_t A1 = 1;
+static const uint8_t A2 = 2;
+static const uint8_t A3 = 3;
+static const uint8_t A4 = 4;
+static const uint8_t A5 = 5;
+
+#endif /* Pins_Arduino_h */