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

variants/rp2040/rp2040-lora/platformio.ini

@@ -0,0 +1,15 @@
+[env:rp2040-lora]
+extends = rp2040_base
+board = rpipico
+upload_protocol = picotool
+# add our variants files to the include and src paths
+build_flags =
+  ${rp2040_base.build_flags}
+  -D RP2040_LORA
+  -I variants/rp2040/rp2040-lora
+  -D DEBUG_RP2040_PORT=Serial
+  -D HW_SPI1_DEVICE
+lib_deps =
+  ${rp2040_base.lib_deps}
+debug_build_flags = ${rp2040_base.build_flags}, -g
+debug_tool = cmsis-dap ; for e.g. Picotool

variants/rp2040/rp2040-lora/variant.h

@@ -0,0 +1,60 @@
+// #define RADIOLIB_CUSTOM_ARDUINO 1
+// #define RADIOLIB_TONE_UNSUPPORTED 1
+// #define RADIOLIB_SOFTWARE_SERIAL_UNSUPPORTED 1
+
+#define ARDUINO_ARCH_AVR
+
+// #define USE_SH1106 1
+
+// default I2C pins:
+// SDA = 4
+// SCL = 5
+
+// Recommended pins for SerialModule:
+// txd = 8
+// rxd = 9
+
+#define EXT_NOTIFY_OUT 22
+#define BUTTON_PIN -1 // Pin 17 used for antenna switching via DIO4
+
+#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 HAS_CPU_SHUTDOWN 1
+#define USE_SX1262
+
+#undef LORA_SCK
+#undef LORA_MISO
+#undef LORA_MOSI
+#undef LORA_CS
+
+// https://www.waveshare.com/rp2040-lora.htm
+// https://www.waveshare.com/img/devkit/RP2040-LoRa-HF/RP2040-LoRa-HF-details-11.jpg
+#define LORA_SCK 14  // GPIO14
+#define LORA_MISO 24 // GPIO24
+#define LORA_MOSI 15 // GPIO15
+#define LORA_CS 13   // GPIO13
+
+#define LORA_DIO0 RADIOLIB_NC // No GPIO connection
+#define LORA_RESET 23         // GPIO23
+#define LORA_BUSY 18          // GPIO18
+#define LORA_DIO1 16          // GPIO16
+#define LORA_DIO2 RADIOLIB_NC // Antenna switching, no GPIO connection
+#define LORA_DIO3 RADIOLIB_NC // No GPIO connection
+#define LORA_DIO4 17          // GPIO17
+
+// On rp2040-lora board the antenna switch is wired and works with complementary-pin control logic.
+// See PE4259 datasheet page 4
+
+#ifdef USE_SX1262
+#define SX126X_CS LORA_CS
+#define SX126X_DIO1 LORA_DIO1
+#define SX126X_BUSY LORA_BUSY
+#define SX126X_RESET LORA_RESET
+#define SX126X_DIO2_AS_RF_SWITCH // Antenna switch CTRL
+#define SX126X_RXEN LORA_DIO4    // Antenna switch !CTRL via GPIO17
+// #define SX126X_DIO3_TCXO_VOLTAGE 1.8
+#endif