feat: add support for RAK3312 (New RAKwireless wiscore ESP32-S3 + SX1262) (#7115)

* Add support for RAK3112 variant with necessary configurations and definitions

* Add the configuration of the LED pin

* Refactor rak3112 variant configuration: update name, remove unused files,

* Update RAK3112 configuration: refine memory settings,  adjust GPS pin definitions

* Update RAK3112 hardware vendor definition to use correct model

* configure LED pins and update module definitions

* Update USB mode configuration for RAK3112 board

* Update power and battery configuration in rak3112 variant

* Cancel the modification of mesh.pb.h

* Rename RAKwireless RAK3112 to RAK3312

---------

Co-authored-by: daniel <daniel.cao@rakwireless.com>
Co-authored-by: Thomas Göttgens <tgoettgens@gmail.com>
Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

variants/rak3312/pins_arduino.h

@@ -0,0 +1,28 @@
+#ifndef Pins_Arduino_h
+#define Pins_Arduino_h
+
+#include "variant.h"
+#include <stdint.h>
+
+#define USB_VID 0x303a
+#define USB_PID 0x1001
+
+// The default Wire will be mapped to PMU and RTC
+static const uint8_t SDA = 9;
+static const uint8_t SCL = 40;
+
+// Default SPI will be mapped to Radio
+static const uint8_t SS = 12;
+static const uint8_t MOSI = 11;
+static const uint8_t MISO = 10;
+static const uint8_t SCK = 13;
+
+#define SPI_MOSI (11)
+#define SPI_SCK (13)
+#define SPI_MISO (10)
+#define SPI_CS (12)
+
+// LEDs
+#define LED_BUILTIN LED_GREEN
+
+#endif /* Pins_Arduino_h */

variants/rak3312/platformio.ini

@@ -0,0 +1,8 @@
+[env:rak3312]
+extends = esp32s3_base
+board = wiscore_rak3312
+board_check = true
+upload_protocol = esptool
+
+build_flags = 
+  ${esp32_base.build_flags} -D RAK3312 -I variants/rak3312

variants/rak3312/variant.h

@@ -0,0 +1,44 @@
+#define I2C_SDA 9
+#define I2C_SCL 40
+
+#define USE_SX1262
+
+#define LORA_SCK 5
+#define LORA_MISO 3
+#define LORA_MOSI 6
+#define LORA_CS 7
+#define LORA_RESET 8
+
+#ifdef USE_SX1262
+#define SX126X_CS LORA_CS
+#define SX126X_DIO1 47
+#define SX126X_BUSY 48
+#define SX126X_RESET LORA_RESET
+#define SX126X_DIO2_AS_RF_SWITCH
+#define SX126X_DIO3_TCXO_VOLTAGE 1.8
+#endif
+
+#define SX126X_POWER_EN (4)
+
+#define PIN_POWER_EN PIN_3V3_EN
+#define PIN_3V3_EN (14)
+
+#define LED_GREEN 46
+#define LED_BLUE 45
+
+#define PIN_LED1 LED_GREEN
+#define PIN_LED2 LED_BLUE
+
+#define LED_CONN LED_BLUE
+#define LED_PIN LED_GREEN
+#define ledOff(pin) pinMode(pin, INPUT)
+
+#define LED_STATE_ON 1 // State when LED is litted
+
+#define HAS_GPS 1
+#define GPS_TX_PIN 43
+#define GPS_RX_PIN 44
+
+#define BATTERY_PIN 1
+#define ADC_CHANNEL ADC1_GPIO1_CHANNEL
+#define ADC_MULTIPLIER 1.667