Fix ESP8266 HardwarEserial init

Author: brentru

src/components/uart/hardware.cpp

@@ -126,7 +126,25 @@ bool UARTHardware::ConfigureSerial() {
     _baud_rate = _config.baud_rate;
 #endif // HAS_SW_SERIAL
   } else {
-    // Create a new HardwareSerial instance
+#if ARDUINO_ARCH_RP2040
+    // On RP2040, use predefined Serial1 or Serial2 instances
+    switch (_config.uart_nbr) {
+    case 0:
+      _hwSerial = &Serial1;
+      break;
+    case 1:
+      _hwSerial = &Serial2;
+      break;
+    default:
+      WS_DEBUG_PRINTLN(
+          "[uart] ERROR: Invalid UART number for RP2040 (use 0 or 1)!");
+      return false;
+    }
+    _hwSerial->setRX(rx_pin);
+    _hwSerial->setTX(tx_pin);
+    _hwSerial->begin((unsigned long)_config.baud_rate, (uint32_t)cfg);
+#else
+    // Create a new HardwareSerial instance for other platforms
     _hwSerial = new HardwareSerial(_config.uart_nbr);
     if (_hwSerial == nullptr) {
       WS_DEBUG_PRINTLN(
@@ -137,15 +155,12 @@ bool UARTHardware::ConfigureSerial() {
 #if ARDUINO_ARCH_ESP32
     _hwSerial->begin((unsigned long)_config.baud_rate, (uint32_t)cfg, rx_pin,
                      tx_pin, false, (unsigned long)_config.timeout);
-#elif ARDUINO_ARCH_RP2040
-    _hwSerial->setRx(rx_pin);
-    _hwSerial->setTx(tx_pin);
-    _hwSerial->begin((unsigned long)_config.baud_rate, (uint32_t)cfg);
 #else
     // ESP8266, SAMD, and other platforms
     // take the default Arduino/Wiring API arguments
     _hwSerial->begin((unsigned long)_config.baud_rate, (uint32_t)cfg);
 #endif
+#endif // ARDUINO_ARCH_RP2040
     _baud_rate = _config.baud_rate;
   }
   return true;