Add sendBreakMicroseconds API

Author: sandeepmistry

keywords.txt

@@ -24,6 +24,7 @@ endTransmission	KEYWORD2
 receive	KEYWORD2
 noReceive	KEYWORD2
 sendBreak	KEYWORD2
+sendBreakMicroseconds	KEYWORD2
 setPins	KEYWORD2
 
 #######################################

src/RS485.cpp

@@ -135,6 +135,16 @@ void RS485Class::sendBreak(unsigned int duration)
   _serial->begin(_baudrate, _config);
 }
 
+void RS485Class::sendBreakMicroseconds(unsigned int duration)
+{
+  _serial->flush();
+  _serial->end();
+  pinMode(_txPin, OUTPUT);
+  digitalWrite(_txPin, LOW);
+  delayMicroseconds(duration);
+  _serial->begin(_baudrate, _config);
+}
+
 void RS485Class::setPins(int txPin, int rePin, int dePin)
 {
   _txPin = txPin;

src/RS485.h

@@ -47,6 +47,7 @@ class RS485Class : public HardwareSerial {
     void noReceive();
 
     void sendBreak(unsigned int duration);
+    void sendBreakMicroseconds(unsigned int duration);
 
     void setPins(int txPin, int rePin, int dePin);