add feature for automatic enable invert IQ on Rx or Tx

Author: eduautomatiza

library.properties

@@ -1,5 +1,5 @@
 name=LoRa
-version=0.9.6
+version=0.9.7
 author=Sandeep Mistry <[email protected]>
 maintainer=Sandeep Mistry <[email protected]>
 sentence=An Arduino library for sending and receiving data using LoRa radios.

src/LoRa.cpp

@@ -77,6 +77,10 @@ LoRaClass::LoRaClass()
       _frequency(0),
       _packetIndex(0),
       // _crcEnabled(false),
+      _automaticInvertIq(false),
+      _invertIqOnTx(false),
+      _invertIqOnRx(false),
+      _invertIqEnable(false),      
       _tx_payload_length(0),
       _implicitHeaderMode(0),
       _onReceive(NULL),
@@ -208,6 +212,13 @@ int LoRaClass::endPacket(bool async, int implicitHeader) {
     fifoTransferWrite(_tx_payload, _tx_payload_length);
   // }
 
+  if (_automaticInvertIq) {
+    if (_invertIqOnTx) {
+      enableInvertIQ();
+    } else {
+      disableInvertIQ();
+    }
+  }  
   // start end
 
   writeRegister(REG_PAYLOAD_LENGTH, _tx_payload_length);
@@ -444,6 +455,14 @@ void LoRaClass::receive(int size) {
   writeRegister(REG_DIO_MAPPING_1, 0x00);  // DIO0 => RXDONE
   writeRegister(REG_DIO_MAPPING_2, 0x40);  //
 
+  if (_automaticInvertIq) {
+    if (_invertIqOnRx) {
+      enableInvertIQ();
+    } else {
+      disableInvertIQ();
+    }
+  }
+
   if (size > 0) {
     implicitHeaderMode();
 
@@ -636,12 +655,31 @@ void LoRaClass::disableCrc() {
   // _crcEnabled = false;
 }
 
-void LoRaClass::enableInvertIQ() {
+void LoRaClass::setAutomaticInvertIQ(bool onTx, bool onRx) {
+  if((onTx == false) && (onRx == false)) {
+    _automaticInvertIq = false;
+    disableInvertIQ(true);
+  } else {
+    _automaticInvertIq = true;
+    _invertIqOnTx = onTx;
+    _invertIqOnRx = onRx;
+  }
+}
+
+void LoRaClass::enableInvertIQ(bool forceInvertIqState) {
+  if (_invertIqEnable == true && forceInvertIqState == false) {
+    return;
+  }
+  _invertIqEnable = true;
   writeRegister(REG_INVERTIQ, 0x66);
   writeRegister(REG_INVERTIQ2, 0x19);
 }
 
-void LoRaClass::disableInvertIQ() {
+void LoRaClass::disableInvertIQ(bool forceInvertIqState) {
+  if(_invertIqEnable == false && forceInvertIqState == false) {
+    return;
+  }
+  _invertIqEnable = false;
   writeRegister(REG_INVERTIQ, 0x27);
   writeRegister(REG_INVERTIQ2, 0x1d);
 }

src/LoRa.h

@@ -34,7 +34,7 @@
 #define MAX_PKT_LENGTH 255
 
 class LoRaClass : public Stream {
- public:
+public:
   LoRaClass();
 
   int begin(long frequency);
@@ -81,8 +81,9 @@ class LoRaClass : public Stream {
   void setSyncWord(int sw);
   void enableCrc();
   void disableCrc();
-  void enableInvertIQ();
-  void disableInvertIQ();
+  void enableInvertIQ(bool forceInvertIqState = false);
+  void disableInvertIQ(bool forceInvertIqState = false);
+  void setAutomaticInvertIQ(bool onTx = false, bool onRx = false);
 
   void setOCP(uint8_t mA);  // Over Current Protection control
 
@@ -101,7 +102,7 @@ class LoRaClass : public Stream {
 
   void dumpRegisters(Stream &out);
 
- private:
+private:
   void explicitHeaderMode();
   void implicitHeaderMode();
 
@@ -122,7 +123,7 @@ class LoRaClass : public Stream {
 
   static void onDio0Rise();
 
- private:
+private:
   SPISettings _spiSettings;
   SPIClass *_spi;
   int _ss;
@@ -131,6 +132,10 @@ class LoRaClass : public Stream {
   long _frequency;
   int _packetIndex;
   // bool _crcEnabled;
+  bool _automaticInvertIq;
+  bool _invertIqOnTx;
+  bool _invertIqOnRx;
+  bool _invertIqEnable;
   size_t _tx_payload_length;
   uint8_t _tx_payload[MAX_PKT_LENGTH + 1 + 2];
   int _implicitHeaderMode;