* BIG refactor: 'board' and 'radio' objects now defined in 'target.h/.cpp'

* mesh::RTCClock class moved to MeshCore.h

variants/lilygo_tlora_v2_1/platformio.ini

@@ -6,6 +6,7 @@ build_type = release  ; Set build type to release
 board_build.partitions = min_spiffs.csv ; get around 4mb flash limit
 build_flags =
   ${esp32_base.build_flags}
+  -I variants/lilygo_tlora_v2_1
   -Os -ffunction-sections -fdata-sections  ; Optimize for size
   -D LILYGO_TLORA  ; LILYGO T-LoRa V2.1-1.6 ESP32 with SX1276
   -D P_LORA_DIO_0=26    ; SX1276 DIO0 interrupt pin
@@ -23,6 +24,8 @@ build_flags =
   -D DISPLAY_CLASS=SSD1306Display
   -D WRAPPER_CLASS=CustomSX1276Wrapper
   -D LORA_TX_POWER=20
+build_src_filter = ${esp32_base.build_src_filter}
+  +<../variants/lilygo_tlora_v2_1>
 lib_deps =
   ${esp32_base.lib_deps}
   adafruit/Adafruit SSD1306 @ ^2.5.13

variants/lilygo_tlora_v2_1/target.cpp

@@ -0,0 +1,25 @@
+#include <Arduino.h>
+#include "target.h"
+
+LilyGoTLoraBoard board;
+
+static SPIClass spi;
+RADIO_CLASS radio = new Module(P_LORA_NSS, P_LORA_DIO_0, P_LORA_RESET, P_LORA_DIO_1, spi);
+
+#ifndef LORA_CR
+  #define LORA_CR      5
+#endif
+
+bool radio_init() {
+  spi.begin(P_LORA_SCLK, P_LORA_MISO, P_LORA_MOSI);
+  int status = radio.begin(LORA_FREQ, LORA_BW, LORA_SF, LORA_CR, RADIOLIB_SX126X_SYNC_WORD_PRIVATE, LORA_TX_POWER, 8);
+  if (status != RADIOLIB_ERR_NONE) {
+    Serial.print("ERROR: radio init failed: ");
+    Serial.println(status);
+    return false;  // fail
+  }
+
+  radio.setCRC(1);
+  
+  return true;  // success
+}

variants/lilygo_tlora_v2_1/target.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <helpers/LilyGoTLoraBoard.h>
+#include <helpers/CustomSX1276Wrapper.h>
+
+extern LilyGoTLoraBoard board;
+extern RADIO_CLASS radio;
+
+bool radio_init();