Initial support for nano g2 ultra

not yet implemented are GPS and external notification LED and buzzer

variants/nano_g2_ultra/nano-g2.h

@@ -0,0 +1,57 @@
+#pragma once
+
+#include <MeshCore.h>
+#include <Arduino.h>
+
+// LoRa radio module pins
+#define P_LORA_DIO_1 (32 + 10)
+#define P_LORA_NSS (32 + 13)
+#define P_LORA_RESET (32 + 15)
+#define P_LORA_BUSY (32 + 11)
+#define P_LORA_SCLK (0 + 12)
+#define P_LORA_MISO (32 + 9)
+#define P_LORA_MOSI (0 + 11)
+
+#define SX126X_DIO2_AS_RF_SWITCH true
+#define SX126X_DIO3_TCXO_VOLTAGE 1.8
+#define SX126X_POWER_EN 37
+
+// buttons
+#define PIN_BUTTON1 (32 + 6)
+#define BUTTON_PIN PIN_BUTTON1
+#define PIN_USER_BTN BUTTON_PIN
+
+// built-ins
+#define VBAT_MV_PER_LSB (0.73242188F) // 3.0V ADC range and 12-bit ADC resolution = 3000mV/4096
+
+#define VBAT_DIVIDER (0.5F)      // 150K + 150K voltage divider on VBAT, actually 100K + 100K
+#define VBAT_DIVIDER_COMP (2.0F) // Compensation factor for the VBAT divider
+
+#define PIN_VBAT_READ (0 + 2)
+#define REAL_VBAT_MV_PER_LSB (VBAT_DIVIDER_COMP * VBAT_MV_PER_LSB)
+
+class NanoG2Ultra : public mesh::MainBoard
+{
+protected:
+  uint8_t startup_reason;
+
+public:
+  void begin();
+  uint16_t getBattMilliVolts() override;
+  bool startOTAUpdate(const char *id, char reply[]) override;
+
+  uint8_t getStartupReason() const override
+  {
+    return startup_reason;
+  }
+
+  const char *getManufacturerName() const override
+  {
+    return "Nano G2 Ultra";
+  }
+
+  void reboot() override
+  {
+    NVIC_SystemReset();
+  }
+};