Due to compelling use case, refactored ctor and begin() to allow Arduino AVR, ESP32 HW serial and ESP8266-previous API compatibility.

Author: dok-net

src/SoftwareSerial.cpp

@@ -34,14 +34,14 @@ SoftwareSerial::SoftwareSerial() {
     m_isrOverflow = false;
 }
 
-SoftwareSerial::SoftwareSerial(int8_t rxPin, int8_t txPin)
+SoftwareSerial::SoftwareSerial(int8_t rxPin, int8_t txPin, bool invert)
 {
     m_isrOverflow = false;
     m_rxPin = rxPin;
     m_txPin = txPin;
+    m_invert = invert;
 }
 
-
 SoftwareSerial::~SoftwareSerial() {
     end();
 }
@@ -100,6 +100,10 @@ void SoftwareSerial::begin(uint32_t baud, SoftwareSerialConfig config,
     if (!m_rxEnabled) { enableRx(true); }
 }
 
+void SoftwareSerial::begin(uint32_t baud, SoftwareSerialConfig config) {
+    begin(baud, config, -1, -1, m_invert);
+}
+
 void SoftwareSerial::end()
 {
     enableRx(false);

src/SoftwareSerial.h

@@ -91,7 +91,7 @@ class SoftwareSerial : public Stream {
     /// Ctor to set defaults for pins.
     /// @param rxPin the GPIO pin used for RX
     /// @param txPin -1 for onewire protocol, GPIO pin used for twowire TX
-    SoftwareSerial(int8_t rxPin, int8_t txPin = -1);
+    SoftwareSerial(int8_t rxPin, int8_t txPin = -1, bool invert = false);
     SoftwareSerial(const SoftwareSerial&) = delete;
     SoftwareSerial& operator= (const SoftwareSerial&) = delete;
     virtual ~SoftwareSerial();
@@ -105,9 +105,10 @@ class SoftwareSerial : public Stream {
     /// @param isrBufCapacity 0: derived from bufCapacity. The capacity of the internal asynchronous
     ///	       bit receive buffer, a suggested size is bufCapacity times the sum of
     ///	       start, data, parity and stop bit count.
-    void begin(uint32_t baud, SoftwareSerialConfig config = SWSERIAL_8N1,
-        int8_t rxPin = -1, int8_t txPin = -1,
+    void begin(uint32_t baud, SoftwareSerialConfig config,
+        int8_t rxPin, int8_t txPin = -1,
         bool invert = false, int bufCapacity = 64, int isrBufCapacity = 0);
+    void begin(uint32_t baud, SoftwareSerialConfig config = SWSERIAL_8N1);
     uint32_t baudRate();
     /// Transmit control pin.
     void setTransmitEnablePin(int8_t txEnablePin);