diff --git a/examples/SX126x/SX126x_Settings/SX126x_Settings.ino b/examples/SX126x/SX126x_Settings/SX126x_Settings.ino
index c93b488f..441db9c3 100644
--- a/examples/SX126x/SX126x_Settings/SX126x_Settings.ino
+++ b/examples/SX126x/SX126x_Settings/SX126x_Settings.ino
@@ -3,7 +3,7 @@
 
    This example shows how to change all the properties of LoRa transmission.
    RadioLib currently supports the following settings:
-    - pins (SPI slave select, digital IO 0, digital IO 1)
+    - pins (SPI slave select, DIO1, DIO2, BUSY pin)
     - carrier frequency
     - bandwidth
     - spreading factor
@@ -12,6 +12,7 @@
     - output power during transmission
     - CRC
     - preamble length
+    - TCXO voltage
 
     Other modules from SX126x family can also be used.
 */
@@ -124,11 +125,20 @@ void setup() {
   }
 
   // disable CRC
-  if (loraSX1268.setCRC(false) == ERR_INVALID_CRC) {
+  if (loraSX1268.setCRC(false) == ERR_INVALID_CRC_CONFIGURATION) {
     Serial.println(F("Selected CRC is invalid for this module!"));
     while (true);
   }
 
+  // Some SX126x have TCXO (temprature compensated crystal
+  // oscillator). To configure TCXO reference voltage,
+  // the following method can be used.
+  if (loraSX1268.setTCXO(2.4) == ERR_INVALID_TCXO_VOLTAGE) {
+    Serial.println(F("Selected TCXO voltage is invalid for this module!"));
+    while (true);
+  }
+  
+
   Serial.println(F("All settings succesfully changed!"));
 }
 
diff --git a/keywords.txt b/keywords.txt
index 90aef2d7..7f96ac03 100644
--- a/keywords.txt
+++ b/keywords.txt
@@ -14,11 +14,13 @@ CC1101	KEYWORD1
 ESP8266	KEYWORD1
 HC05	KEYWORD1
 JDY08	KEYWORD1
+nRF24	KEYWORD1
 RF69	KEYWORD1
 RFM95	KEYWORD1
 RFM96	KEYWORD1
 RFM97	KEYWORD1
 RFM98	KEYWORD1
+SIM800	KEYWORD1
 SX1231	KEYWORD1
 SX1261	KEYWORD1
 SX1262	KEYWORD1
@@ -98,6 +100,10 @@ getLQI	KEYWORD2
 setGdo0Action	KEYWORD2
 setGdo1Action KEYWORD2
 
+# SX126x-specific
+setDio2Action	KEYWORD2
+setTCXO	KEYWORD2
+
 # ESP8266
 join	KEYWORD2
 reset	KEYWORD2
@@ -108,6 +114,11 @@ setPanId	KEYWORD2
 getPacketSource	KEYWORD2
 getPacketData	KEYWORD2
 
+# nRF24
+setTransmitAddress	KEYWORD2
+setReceivePipe	KEYWORD2
+disablePipe	KEYWORD2
+
 # HTTP
 get	KEYWORD2
 post	KEYWORD2
@@ -135,6 +146,10 @@ send	KEYWORD2
 receive	KEYWORD2
 getNumBytes	KEYWORD2
 
+# SIM800
+sendSMS	KEYWORD2
+shutdown	KEYWORD2
+
 #######################################
 # Constants (LITERAL1)
 #######################################
@@ -198,7 +213,12 @@ ITA2	LITERAL1
 ERR_INVALID_RTTY_SHIFT	LITERAL1
 ERR_UNSUPPORTED_ENCODING	LITERAL1
 
+ERR_INVALID_DATA_RATE	LITERAL1
+ERR_INVALID_ADDRESS_WIDTH	LITERAL1
+ERR_INVALID_PIPE_NUMBER	LITERAL1
+
 ERR_INVALID_NUM_BROAD_ADDRS	LITERAL1
 
-ERR_INVALID_CRC	LITERAL1
+ERR_INVALID_CRC_CONFIGURATION	LITERAL1
 LORA_DETECTED	LITERAL1
+ERR_INVALID_TCXO_VOLTAGE	LITERAL1
diff --git a/src/TypeDef.h b/src/TypeDef.h
index 7cc0a70b..8fadb264 100644
--- a/src/TypeDef.h
+++ b/src/TypeDef.h
@@ -109,7 +109,8 @@
 #define ERR_INVALID_NUM_BROAD_ADDRS           -601
 
 // SX126x-specific status codes
-#define ERR_INVALID_CRC                       -701
+#define ERR_INVALID_CRC_CONFIGURATION         -701
 #define LORA_DETECTED                         -702
+#define ERR_INVALID_TCXO_VOLTAGE              -703
 
 #endif
diff --git a/src/modules/SX126x.cpp b/src/modules/SX126x.cpp
index 3f9827b8..edeafe2e 100644
--- a/src/modules/SX126x.cpp
+++ b/src/modules/SX126x.cpp
@@ -733,7 +733,7 @@ int16_t SX126x::setCRC(uint8_t len, uint16_t initial, uint16_t polynomial, bool
       }
       break;
     default:
-      return(ERR_INVALID_CRC);
+      return(ERR_INVALID_CRC_CONFIGURATION);
   }
   setPacketParamsFSK(_preambleLengthFSK, _crcTypeFSK, _syncWordLength, _addrComp);
 
@@ -772,6 +772,44 @@ float SX126x::getSNR() {
   return(snrPkt/4.0);
 }
 
+int16_t SX126x::setTCXO(float voltage, uint32_t timeout) {
+  // set mode to standby
+  standby();
+
+  // check alowed voltage values
+  uint8_t data[4];
+  if(abs(voltage - 1.6) <= 0.001) {
+    data[0] = SX126X_DIO3_OUTPUT_1_6;
+  } else if(abs(voltage - 1.7) <= 0.001) {
+    data[0] = SX126X_DIO3_OUTPUT_1_7;
+  } else if(abs(voltage - 1.8) <= 0.001) {
+    data[0] = SX126X_DIO3_OUTPUT_1_8;
+  } else if(abs(voltage - 2.2) <= 0.001) {
+    data[0] = SX126X_DIO3_OUTPUT_2_2;
+  } else if(abs(voltage - 2.4) <= 0.001) {
+    data[0] = SX126X_DIO3_OUTPUT_2_4;
+  } else if(abs(voltage - 2.7) <= 0.001) {
+    data[0] = SX126X_DIO3_OUTPUT_2_7;
+  } else if(abs(voltage - 3.0) <= 0.001) {
+    data[0] = SX126X_DIO3_OUTPUT_3_0;
+  } else if(abs(voltage - 3.3) <= 0.001) {
+    data[0] = SX126X_DIO3_OUTPUT_3_3;
+  } else {
+    return(ERR_INVALID_TCXO_VOLTAGE);
+  }
+
+  // calculate timeout
+  uint32_t timeoutValue = (float)timeout / 15.625;
+  data[1] = (uint8_t)((timeoutValue >> 16) & 0xFF)
+  data[2] = (uint8_t)((timeoutValue >> 8) & 0xFF)
+  data[3] = (uint8_t)(timeoutValue & 0xFF)
+
+  // enable TCXO control on DIO3
+  SPIwriteCommand(SX126X_CMD_SET_DIO3_AS_TCXO_CTRL, data, 4);
+
+  return(ERR_NONE);
+}
+
 void SX126x::setTx(uint32_t timeout) {
   uint8_t data[3] = {(uint8_t)((timeout >> 16) & 0xFF), (uint8_t)((timeout >> 8) & 0xFF), (uint8_t)(timeout & 0xFF)};
   SPIwriteCommand(SX126X_CMD_SET_TX, data, 3);
diff --git a/src/modules/SX126x.h b/src/modules/SX126x.h
index 39344996..d3da4c00 100644
--- a/src/modules/SX126x.h
+++ b/src/modules/SX126x.h
@@ -359,6 +359,7 @@ class SX126x: public PhysicalLayer {
     int16_t disableAddressFiltering();
     int16_t setCRC(bool enableCRC);
     int16_t setCRC(uint8_t len, uint16_t initial = 0x1D0F, uint16_t polynomial = 0x1021, bool inverted = true);
+    int16_t setTCXO(float voltage, uint32_t timeout = 5000);
     float getDataRate();
     float getRSSI();
     float getSNR();