Add support for new NRF52 board, MeshLink (#5736)

* Add support for MeshLink

* Updated, enabled watchdog and added button definition

* added eink variant and removed some compile errors

* Small board json file edit

* Finally got trunk working (somehow?), this is just cleanup with trunk fmt

* Various improvements and cleanup. Removed the use of PIN_3V3_En and defined a specific WD_EN pin instead for better clarity. Will do a bit more testing asap to make sure everything still works as intended :)

* Enable on-board QSPI Flash

* run trunk fmt with clang-format

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
Co-authored-by: Thomas Göttgens <tgoettgens@gmail.com>
Co-authored-by: Austin <vidplace7@gmail.com>

src/graphics/EInkDisplay2.cpp

@@ -140,6 +140,15 @@ bool EInkDisplay::connect()
         adafruitDisplay->setRotation(3);
         adafruitDisplay->setPartialWindow(0, 0, displayWidth, displayHeight);
     }
+#elif defined(MESHLINK)
+    {
+        auto lowLevel = new EINK_DISPLAY_MODEL(PIN_EINK_CS, PIN_EINK_DC, PIN_EINK_RES, PIN_EINK_BUSY, SPI1);
+
+        adafruitDisplay = new GxEPD2_BW<EINK_DISPLAY_MODEL, EINK_DISPLAY_MODEL::HEIGHT>(*lowLevel);
+        adafruitDisplay->init();
+        adafruitDisplay->setRotation(3);
+        adafruitDisplay->setPartialWindow(0, 0, displayWidth, displayHeight);
+    }
 #elif defined(RAK4630) || defined(MAKERPYTHON)
     {
         if (eink_found) {

src/mesh/generated/meshtastic/mesh.pb.h

@@ -1775,4 +1775,4 @@ extern const pb_msgdesc_t meshtastic_ChunkedPayloadResponse_msg;
 } /* extern "C" */
 #endif
 
-#endif
+#endif

src/modules/SerialModule.cpp

@@ -60,7 +60,7 @@
 SerialModule *serialModule;
 SerialModuleRadio *serialModuleRadio;
 
-#if defined(TTGO_T_ECHO) || defined(CANARYONE)
+#if defined(TTGO_T_ECHO) || defined(CANARYONE) || defined(MESHLINK)
 SerialModule::SerialModule() : StreamAPI(&Serial), concurrency::OSThread("Serial") {}
 static Print *serialPrint = &Serial;
 #elif defined(CONFIG_IDF_TARGET_ESP32C6)
@@ -158,7 +158,7 @@ int32_t SerialModule::runOnce()
                 Serial.begin(baud);
                 Serial.setTimeout(moduleConfig.serial.timeout > 0 ? moduleConfig.serial.timeout : TIMEOUT);
             }
-#elif !defined(TTGO_T_ECHO) && !defined(CANARYONE)
+#elif !defined(TTGO_T_ECHO) && !defined(CANARYONE) && !defined(MESHLINK)
             if (moduleConfig.serial.rxd && moduleConfig.serial.txd) {
 #ifdef ARCH_RP2040
                 Serial2.setFIFOSize(RX_BUFFER);
@@ -214,7 +214,7 @@ int32_t SerialModule::runOnce()
                 }
             }
 
-#if !defined(TTGO_T_ECHO) && !defined(CANARYONE)
+#if !defined(TTGO_T_ECHO) && !defined(CANARYONE) && !defined(MESHLINK)
             else if ((moduleConfig.serial.mode == meshtastic_ModuleConfig_SerialConfig_Serial_Mode_WS85)) {
                 processWXSerial();
 
@@ -416,7 +416,7 @@ uint32_t SerialModule::getBaudRate()
  */
 void SerialModule::processWXSerial()
 {
-#if !defined(TTGO_T_ECHO) && !defined(CANARYONE) && !defined(CONFIG_IDF_TARGET_ESP32C6)
+#if !defined(TTGO_T_ECHO) && !defined(CANARYONE) && !defined(CONFIG_IDF_TARGET_ESP32C6) && !defined(MESHLINK)
     static unsigned int lastAveraged = 0;
     static unsigned int averageIntervalMillis = 300000; // 5 minutes hard coded.
     static double dir_sum_sin = 0;

src/platform/nrf52/architecture.h

@@ -127,4 +127,4 @@
 #if !defined(PIN_SERIAL_RX) && !defined(NRF52840_XXAA)
 // No serial ports on this board - ONLY use segger in memory console
 #define USE_SEGGER
-#endif
+#endif

src/platform/nrf52/main-nrf52.cpp

@@ -304,6 +304,11 @@ void cpuDeepSleep(uint32_t msecToWake)
     nrf_gpio_cfg_default(WB_I2C1_SDA);
 #endif
 #endif
+#ifdef MESHLINK
+#ifdef PIN_WD_EN
+    digitalWrite(PIN_WD_EN, LOW);
+#endif
+#endif
 
 #ifdef HELTEC_MESH_NODE_T114
     nrf_gpio_cfg_default(PIN_GPS_PPS);

src/sleep.cpp

@@ -245,6 +245,9 @@ void doDeepSleep(uint32_t msecToWake, bool skipPreflight = false, bool skipSaveN
 #ifdef PIN_3V3_EN
     digitalWrite(PIN_3V3_EN, LOW);
 #endif
+#ifdef PIN_WD_EN
+    digitalWrite(PIN_WD_EN, LOW);
+#endif
 #endif
     ledBlink.set(false);
 
@@ -530,4 +533,4 @@ void enableLoraInterrupt()
     }
 #endif
 }
-#endif
+#endif