From 78022ce6add50f50ce81bda59c374410e879597b Mon Sep 17 00:00:00 2001
From: jgromes <jgromes@users.noreply.github.com>
Date: Thu, 18 Jun 2020 16:31:38 +0200
Subject: [PATCH] Added external RF switch control base

---
 keywords.txt   |  1 +
 src/Module.cpp | 24 ++++++++++++++++++++++++
 src/Module.h   | 20 ++++++++++++++++++++
 3 files changed, 45 insertions(+)

diff --git a/keywords.txt b/keywords.txt
index d7aa3950..f55c7fbf 100644
--- a/keywords.txt
+++ b/keywords.txt
@@ -127,6 +127,7 @@ setEncoding	KEYWORD2
 getIRQFlags	KEYWORD2
 getModemStatus	KEYWORD2
 getTempRaw	KEYWORD2
+setRfSwitchPins	KEYWORD2
 
 # RF69-specific
 setAESKey	KEYWORD2
diff --git a/src/Module.cpp b/src/Module.cpp
index b4db0504..af6415bb 100644
--- a/src/Module.cpp
+++ b/src/Module.cpp
@@ -314,3 +314,27 @@ void Module::noTone(RADIOLIB_PIN_TYPE pin) {
   }
   #endif
 }
+
+void Module::setRfSwitchPins(RADIOLIB_PIN_TYPE rxEn, RADIOLIB_PIN_TYPE txEn) {
+  _useRfSwitch = true;
+  _rxEn = rxEn;
+  _txEn = txEn;
+  Module::pinMode(rxEn, OUTPUT);
+  Module::pinMode(txEn, OUTPUT);
+}
+
+void Module::setRfSwitchState(bool tx) {
+  // check RF switch control is enabled
+  if(!_useRfSwitch) {
+    return;
+  }
+
+  // set pins
+  if(tx) {
+    Module::digitalWrite(_rxEn, LOW);
+    Module::digitalWrite(_txEn, HIGH);
+  } else {
+    Module::digitalWrite(_rxEn, HIGH);
+    Module::digitalWrite(_txEn, LOW);
+  }
+}
diff --git a/src/Module.h b/src/Module.h
index a77d1a7e..41e25299 100644
--- a/src/Module.h
+++ b/src/Module.h
@@ -386,6 +386,23 @@ class Module {
     */
     static void noTone(RADIOLIB_PIN_TYPE pin);
 
+    /*!
+      \brief Some modules contain external RF switch controlled by two pins. This function gives RadioLib control over those two pins to automatically switch Rx and Tx state.
+      When using automatic RF switch control, DO NOT change the pin mode of rxEn or txEn from Arduino sketch!
+
+      \param rxEn RX enable pin.
+
+      \param txEn TX enable pin.
+    */
+    void setRfSwitchPins(RADIOLIB_PIN_TYPE rxEn, RADIOLIB_PIN_TYPE txEn);
+
+    /*!
+      \brief Set RF switch state.
+
+      \param tx True to set RF switch to Tx, false to set switch to Rx.
+    */
+    void setRfSwitchState(bool tx);
+
 #ifndef RADIOLIB_GODMODE
   private:
 #endif
@@ -399,6 +416,9 @@ class Module {
     SPIClass* _spi;
     SPISettings _spiSettings;
 
+    bool _useRfSwitch = false;
+    RADIOLIB_PIN_TYPE _rxEn, _txEn;
+
     uint32_t _ATtimeout = 15000;
 };