RP2040/RP2350: Migrate variants to new structure (#7345)

variants/rp2350/rpipico2/platformio.ini

@@ -0,0 +1,16 @@
+[env:pico2]
+extends = rp2350_base
+board = rpipico2
+upload_protocol = picotool
+
+# add our variants files to the include and src paths
+build_flags =
+  ${rp2350_base.build_flags}
+  -D RPI_PICO2
+  -I variants/rp2350/rpipico2
+  -D DEBUG_RP2040_PORT=Serial
+  -D HW_SPI1_DEVICE
+lib_deps =
+  ${rp2350_base.lib_deps}
+debug_build_flags = ${rp2350_base.build_flags}, -g
+debug_tool = cmsis-dap ; for e.g. Picotool

variants/rp2350/rpipico2/variant.h

@@ -0,0 +1,50 @@
+// #define RADIOLIB_CUSTOM_ARDUINO 1
+// #define RADIOLIB_TONE_UNSUPPORTED 1
+// #define RADIOLIB_SOFTWARE_SERIAL_UNSUPPORTED 1
+
+#define ARDUINO_ARCH_AVR
+
+// default I2C pins:
+// SDA = 4
+// SCL = 5
+
+// Recommended pins for SerialModule:
+// txd = 8
+// rxd = 9
+
+#define EXT_NOTIFY_OUT 22
+#define BUTTON_PIN 17
+
+#define LED_PIN PIN_LED
+
+#define BATTERY_PIN 26
+// ratio of voltage divider = 3.0 (R17=200k, R18=100k)
+#define ADC_MULTIPLIER 3.1 // 3.0 + a bit for being optimistic
+#define BATTERY_SENSE_RESOLUTION_BITS ADC_RESOLUTION
+
+#define USE_SX1262
+
+#undef LORA_SCK
+#undef LORA_MISO
+#undef LORA_MOSI
+#undef LORA_CS
+
+#define LORA_SCK 10
+#define LORA_MISO 12
+#define LORA_MOSI 11
+#define LORA_CS 3
+
+#define LORA_DIO0 RADIOLIB_NC
+#define LORA_RESET 15
+#define LORA_DIO1 20
+#define LORA_DIO2 2
+#define LORA_DIO3 RADIOLIB_NC
+
+#ifdef USE_SX1262
+#define SX126X_CS LORA_CS
+#define SX126X_DIO1 LORA_DIO1
+#define SX126X_BUSY LORA_DIO2
+#define SX126X_RESET LORA_RESET
+#define SX126X_DIO2_AS_RF_SWITCH
+#define SX126X_DIO3_TCXO_VOLTAGE 1.8
+#endif