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

* mesh::RTCClock class moved to MeshCore.h

variants/heltec_v2/platformio.ini

@@ -3,6 +3,7 @@ extends = esp32_base
 board = heltec_wifi_lora_32_V2   ; heltec_wifi_lora_32_V2
 build_flags =
   ${esp32_base.build_flags}
+  -I variants/heltec_v2
   -D HELTEC_LORA_V2
   -D PIN_BOARD_SDA=4
   -D PIN_BOARD_SCL=15
@@ -13,6 +14,7 @@ build_flags =
   -D LORA_TX_POWER=20
   -D P_LORA_TX_LED=25
 build_src_filter = ${esp32_base.build_src_filter}
+  +<../variants/heltec_v2>
 lib_deps =
   ${esp32_base.lib_deps}
   adafruit/Adafruit SSD1306 @ ^2.5.13

variants/heltec_v2/target.cpp

@@ -0,0 +1,31 @@
+#include <Arduino.h>
+#include "target.h"
+
+HeltecV2Board board;
+
+#if defined(P_LORA_SCLK)
+  static SPIClass spi;
+  RADIO_CLASS radio = new Module(P_LORA_NSS, P_LORA_DIO_1, P_LORA_RESET, P_LORA_BUSY, spi);
+#else
+  RADIO_CLASS radio = new Module(P_LORA_NSS, P_LORA_DIO_1, P_LORA_RESET, P_LORA_BUSY);
+#endif
+
+#ifndef LORA_CR
+  #define LORA_CR      5
+#endif
+
+bool radio_init() {
+#if defined(P_LORA_SCLK)
+  spi.begin(P_LORA_SCLK, P_LORA_MISO, P_LORA_MOSI);
+#endif
+  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/heltec_v2/target.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <helpers/HeltecV2Board.h>
+#include <helpers/CustomSX1276Wrapper.h>
+
+extern HeltecV2Board board;
+extern RADIO_CLASS radio;
+
+bool radio_init();