Rak3112 support (#8591)

* Add rak3112 to board variants

* Add rak3112 to architecture definitions

* Disable SDcard support

* Update comments

* Remove duplicate definitions and use expected SPI naming for SDcard module

* SDcard module serial interface chip set definition

* Refactor modular variant into existing environment

* Make requested changes

* Extend 3312 variants

* Remove duplicate architecture definition

* Fix definition naming

variants/esp32s3/rak3312/variant.h

@@ -18,11 +18,6 @@
 #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
 
@@ -35,10 +30,30 @@
 
 #define LED_STATE_ON 1 // State when LED is litted
 
+#define BATTERY_PIN 1
+#define ADC_CHANNEL ADC1_GPIO1_CHANNEL
+
+#ifdef _VARIANT_RAK3112_ //  Modular variant (stamp)
+#define ADC_MULTIPLIER 2.11
+
+#define BUTTON_NEED_PULLUP
+
+#define HAS_SDCARD
+#define SDCARD_USE_SPI1
+#define SDCARD_CS SPI_CS
+
+#define I2C_SDA1 PIN_WIRE1_SDA
+#define I2C_SCL1 PIN_WIRE1_SCL
+#else // Generic 3312 variant (40-pin standard connector)
+#define ADC_MULTIPLIER 1.667
+
+#define SX126X_POWER_EN (4)
+
+#define PIN_POWER_EN PIN_3V3_EN
+#define PIN_3V3_EN (14)
+
 #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
+#endif