Update HardwareSerial to return both the nominal (set) value instead of the actual working value

Author: mircopz

cores/esp32/HardwareSerial.cpp

@@ -135,6 +135,7 @@ void serialEventRun(void)
 HardwareSerial::HardwareSerial(int uart_nr) : 
 _uart_nr(uart_nr), 
 _uart(NULL),
+_baudrate(0),
 _rxBufferSize(256),
 _txBufferSize(0), 
 _onReceiveCB(NULL), 
@@ -395,6 +396,8 @@ void HardwareSerial::begin(unsigned long baud, uint32_t config, int8_t rxPin, in
             _uart = NULL;
         }
     }
+    else
+      _baudrate = baud;
     // create a task to deal with Serial Events when, for example, calling begin() twice to change the baudrate,
     // or when setting the callback before calling begin() 
     if (_uart != NULL && (_onReceiveCB != NULL || _onReceiveErrorCB != NULL) && _eventTask == NULL) {
@@ -427,6 +430,7 @@ void HardwareSerial::begin(unsigned long baud, uint32_t config, int8_t rxPin, in
 void HardwareSerial::updateBaudRate(unsigned long baud)
 {
 	uartSetBaudRate(_uart, baud);
+	_baudrate = baud;
 }
 
 void HardwareSerial::end(bool fullyTerminate)
@@ -449,6 +453,7 @@ void HardwareSerial::end(bool fullyTerminate)
     delay(10);
     uartEnd(_uart);
     _uart = 0;
+    _baudrate = 0;
     _destroyEventTask();
 }
 
@@ -529,10 +534,12 @@ size_t HardwareSerial::write(const uint8_t *buffer, size_t size)
     uartWriteBuf(_uart, buffer, size);
     return size;
 }
-uint32_t  HardwareSerial::baudRate()
 
+uint32_t  HardwareSerial::baudRate(bool nominal)
 {
-	return uartGetBaudRate(_uart);
+    if (nominal)
+        return _baudrate;
+    return uartGetBaudRate(_uart);
 }
 HardwareSerial::operator bool() const
 {

cores/esp32/HardwareSerial.h

@@ -152,7 +152,7 @@ class HardwareSerial: public Stream
     {
         return write((uint8_t) n);
     }
-    uint32_t baudRate();
+    uint32_t baudRate(bool nominal = true);
     operator bool() const;
 
     void setDebugOutput(bool);