diff --git a/src/BuildOpt.h b/src/BuildOpt.h
index f09f75a9..48ca539e 100644
--- a/src/BuildOpt.h
+++ b/src/BuildOpt.h
@@ -108,6 +108,7 @@
   //#define RADIOLIB_EXCLUDE_MORSE
   //#define RADIOLIB_EXCLUDE_RTTY
   //#define RADIOLIB_EXCLUDE_SSTV
+  //#define RADIOLIB_EXCLUDE_DIRECT_RECEIVE
 
 #else
   #if defined(__AVR__) && !(defined(ARDUINO_AVR_UNO_WIFI_REV2) || defined(ARDUINO_AVR_NANO_EVERY) || defined(ARDUINO_ARCH_MEGAAVR))
diff --git a/src/modules/CC1101/CC1101.cpp b/src/modules/CC1101/CC1101.cpp
index bc188f43..e9e36700 100644
--- a/src/modules/CC1101/CC1101.cpp
+++ b/src/modules/CC1101/CC1101.cpp
@@ -890,6 +890,7 @@ int16_t CC1101::getChipVersion() {
   return(SPIgetRegValue(RADIOLIB_CC1101_REG_VERSION));
 }
 
+#if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
 void CC1101::setDirectAction(void (*func)(void)) {
   setGdo0Action(func);
 }
@@ -897,6 +898,7 @@ void CC1101::setDirectAction(void (*func)(void)) {
 void CC1101::readBit(RADIOLIB_PIN_TYPE pin) {
   updateDirectBuffer((uint8_t)digitalRead(pin));
 }
+#endif
 
 int16_t CC1101::setDIOMapping(RADIOLIB_PIN_TYPE pin, uint8_t value) {
   if (pin > 2)
diff --git a/src/modules/CC1101/CC1101.h b/src/modules/CC1101/CC1101.h
index fd8cb621..a661107f 100644
--- a/src/modules/CC1101/CC1101.h
+++ b/src/modules/CC1101/CC1101.h
@@ -920,6 +920,7 @@ class CC1101: public PhysicalLayer {
    */
     int16_t getChipVersion();
 
+    #if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
     /*!
       \brief Set interrupt service routine function to call when data bit is receveid in direct mode.
 
@@ -933,6 +934,7 @@ class CC1101: public PhysicalLayer {
       \param pin Pin on which to read.
     */
     void readBit(RADIOLIB_PIN_TYPE pin);
+    #endif
 
     /*!
       \brief Configure DIO pin mapping to get a given signal on a DIO pin (if available).
diff --git a/src/modules/RF69/RF69.cpp b/src/modules/RF69/RF69.cpp
index 82d47c18..9fc69ef2 100644
--- a/src/modules/RF69/RF69.cpp
+++ b/src/modules/RF69/RF69.cpp
@@ -895,6 +895,7 @@ uint8_t RF69::randomByte() {
   return(randByte);
 }
 
+#if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
 void RF69::setDirectAction(void (*func)(void)) {
   setDio1Action(func);
 }
@@ -902,15 +903,18 @@ void RF69::setDirectAction(void (*func)(void)) {
 void RF69::readBit(RADIOLIB_PIN_TYPE pin) {
   updateDirectBuffer((uint8_t)digitalRead(pin));
 }
+#endif
 
 int16_t RF69::setDIOMapping(RADIOLIB_PIN_TYPE pin, uint8_t value) {
-  if (pin > 5)
-    return RADIOLIB_ERR_INVALID_DIO_PIN;
+  if(pin > 5) {
+    return(RADIOLIB_ERR_INVALID_DIO_PIN);
+  }
 
-  if (pin < 4)
+  if(pin < 4) {
     return(_mod->SPIsetRegValue(RADIOLIB_RF69_REG_DIO_MAPPING_1, value, 7 - 2 * pin, 6 - 2 * pin));
-  else
-    return(_mod->SPIsetRegValue(RADIOLIB_RF69_REG_DIO_MAPPING_2, value, 15 - 2 * pin, 14 - 2 * pin));
+  }
+
+  return(_mod->SPIsetRegValue(RADIOLIB_RF69_REG_DIO_MAPPING_2, value, 15 - 2 * pin, 14 - 2 * pin));
 }
 
 int16_t RF69::getChipVersion() {
diff --git a/src/modules/RF69/RF69.h b/src/modules/RF69/RF69.h
index e7652e51..ef9969e2 100644
--- a/src/modules/RF69/RF69.h
+++ b/src/modules/RF69/RF69.h
@@ -985,6 +985,7 @@ class RF69: public PhysicalLayer {
    */
     int16_t getChipVersion();
 
+    #if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
     /*!
       \brief Set interrupt service routine function to call when data bit is receveid in direct mode.
 
@@ -998,6 +999,7 @@ class RF69: public PhysicalLayer {
       \param pin Pin on which to read.
     */
     void readBit(RADIOLIB_PIN_TYPE pin);
+    #endif
 
     /*!
       \brief Configure DIO pin mapping to get a given signal on a DIO pin (if available).
diff --git a/src/modules/SX126x/SX126x.cpp b/src/modules/SX126x/SX126x.cpp
index 64161ea3..14868dd1 100644
--- a/src/modules/SX126x/SX126x.cpp
+++ b/src/modules/SX126x/SX126x.cpp
@@ -1233,6 +1233,7 @@ uint8_t SX126x::randomByte() {
   return(randByte);
 }
 
+#if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
 void SX126x::setDirectAction(void (*func)(void)) {
   // SX126x is unable to perform direct mode reception
   // this method is implemented only for PhysicalLayer compatibility
@@ -1244,6 +1245,7 @@ void SX126x::readBit(RADIOLIB_PIN_TYPE pin) {
   // this method is implemented only for PhysicalLayer compatibility
   (void)pin;
 }
+#endif
 
 int16_t SX126x::setTCXO(float voltage, uint32_t delay) {
   // set mode to standby
diff --git a/src/modules/SX126x/SX126x.h b/src/modules/SX126x/SX126x.h
index df2d2952..0c426566 100644
--- a/src/modules/SX126x/SX126x.h
+++ b/src/modules/SX126x/SX126x.h
@@ -928,6 +928,7 @@ class SX126x: public PhysicalLayer {
   */
    uint8_t randomByte();
 
+   #if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
    /*!
      \brief Dummy method, to ensure PhysicalLayer compatibility.
 
@@ -941,6 +942,8 @@ class SX126x: public PhysicalLayer {
      \param pin Ignored.
    */
    void readBit(RADIOLIB_PIN_TYPE pin);
+   #endif
+
 
 #if !defined(RADIOLIB_GODMODE)
   protected:
diff --git a/src/modules/SX127x/SX127x.cpp b/src/modules/SX127x/SX127x.cpp
index 31396428..29980071 100644
--- a/src/modules/SX127x/SX127x.cpp
+++ b/src/modules/SX127x/SX127x.cpp
@@ -1493,6 +1493,7 @@ int16_t SX127x::invertIQ(bool invertIQ) {
   return(state);
 }
 
+#if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
 void SX127x::setDirectAction(void (*func)(void)) {
   setDio1Action(func);
 }
@@ -1500,6 +1501,7 @@ void SX127x::setDirectAction(void (*func)(void)) {
 void SX127x::readBit(RADIOLIB_PIN_TYPE pin) {
   updateDirectBuffer((uint8_t)digitalRead(pin));
 }
+#endif
 
 int16_t SX127x::setFHSSHoppingPeriod(uint8_t freqHoppingPeriod) {
   return(_mod->SPIsetRegValue(RADIOLIB_SX127X_REG_HOP_PERIOD, freqHoppingPeriod));
diff --git a/src/modules/SX127x/SX127x.h b/src/modules/SX127x/SX127x.h
index 505abd6c..996776c9 100644
--- a/src/modules/SX127x/SX127x.h
+++ b/src/modules/SX127x/SX127x.h
@@ -557,8 +557,8 @@
 #define RADIOLIB_SX127X_DIO5_PACK_PLL_LOCK                     0b00010000  //  5     4
 #define RADIOLIB_SX127X_DIO5_PACK_DATA                         0b00100000  //  5     4
 #define RADIOLIB_SX127X_DIO5_PACK_MODE_READY                   0b00110000  //  5     4
-#define RADIOLIB_SX127X_DIO_MAP_PREAMBLE_DETECT                0b00000001  //  0     0     
-#define RADIOLIB_SX127X_DIO_MAP_RSSI                           0b00000000  //  0     0     
+#define RADIOLIB_SX127X_DIO_MAP_PREAMBLE_DETECT                0b00000001  //  0     0
+#define RADIOLIB_SX127X_DIO_MAP_RSSI                           0b00000000  //  0     0
 
 // SX1272_REG_PLL_HOP + SX1278_REG_PLL_HOP
 #define RADIOLIB_SX127X_FAST_HOP_OFF                           0b00000000  //  7     7     carrier frequency validated when FRF registers are written
@@ -1163,6 +1163,7 @@ class SX127x: public PhysicalLayer {
     */
     int16_t invertIQ(bool invertIQ);
 
+    #if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
     /*!
       \brief Set interrupt service routine function to call when data bit is receveid in direct mode.
 
@@ -1176,6 +1177,7 @@ class SX127x: public PhysicalLayer {
       \param pin Pin on which to read.
     */
     void readBit(RADIOLIB_PIN_TYPE pin);
+    #endif
 
     /*!
       \brief Sets the hopping period and enables FHSS
diff --git a/src/modules/SX128x/SX128x.cpp b/src/modules/SX128x/SX128x.cpp
index cf09f0bb..d61ce930 100644
--- a/src/modules/SX128x/SX128x.cpp
+++ b/src/modules/SX128x/SX128x.cpp
@@ -1243,6 +1243,7 @@ uint8_t SX128x::randomByte() {
   return(0);
 }
 
+#if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
 void SX128x::setDirectAction(void (*func)(void)) {
   // SX128x is unable to perform direct mode reception
   // this method is implemented only for PhysicalLayer compatibility
@@ -1254,6 +1255,7 @@ void SX128x::readBit(RADIOLIB_PIN_TYPE pin) {
   // this method is implemented only for PhysicalLayer compatibility
   (void)pin;
 }
+#endif
 
 uint8_t SX128x::getStatus() {
   uint8_t data = 0;
diff --git a/src/modules/SX128x/SX128x.h b/src/modules/SX128x/SX128x.h
index f9df39e3..6e1a7894 100644
--- a/src/modules/SX128x/SX128x.h
+++ b/src/modules/SX128x/SX128x.h
@@ -812,6 +812,7 @@ class SX128x: public PhysicalLayer {
    */
     uint8_t randomByte();
 
+    #if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
     /*!
       \brief Dummy method, to ensure PhysicalLayer compatibility.
 
@@ -825,6 +826,7 @@ class SX128x: public PhysicalLayer {
       \param pin Ignored.
     */
     void readBit(RADIOLIB_PIN_TYPE pin);
+    #endif
 
 #if !defined(RADIOLIB_GODMODE) && !defined(RADIOLIB_LOW_LEVEL)
   protected:
diff --git a/src/modules/Si443x/Si443x.cpp b/src/modules/Si443x/Si443x.cpp
index f033d0ec..fcd41876 100644
--- a/src/modules/Si443x/Si443x.cpp
+++ b/src/modules/Si443x/Si443x.cpp
@@ -589,6 +589,7 @@ int16_t Si443x::getChipVersion() {
   return(_mod->SPIgetRegValue(RADIOLIB_SI443X_REG_DEVICE_VERSION));
 }
 
+#if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
 void Si443x::setDirectAction(void (*func)(void)) {
   setIrqAction(func);
 }
@@ -596,6 +597,7 @@ void Si443x::setDirectAction(void (*func)(void)) {
 void Si443x::readBit(RADIOLIB_PIN_TYPE pin) {
   updateDirectBuffer((uint8_t)digitalRead(pin));
 }
+#endif
 
 int16_t Si443x::fixedPacketLengthMode(uint8_t len) {
   return(Si443x::setPacketMode(RADIOLIB_SI443X_FIXED_PACKET_LENGTH_ON, len));
diff --git a/src/modules/Si443x/Si443x.h b/src/modules/Si443x/Si443x.h
index 40feceef..2175be7c 100644
--- a/src/modules/Si443x/Si443x.h
+++ b/src/modules/Si443x/Si443x.h
@@ -802,6 +802,7 @@ class Si443x: public PhysicalLayer {
    */
     int16_t getChipVersion();
 
+    #if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
     /*!
       \brief Set interrupt service routine function to call when data bit is receveid in direct mode.
 
@@ -815,6 +816,7 @@ class Si443x: public PhysicalLayer {
       \param pin Pin on which to read.
     */
     void readBit(RADIOLIB_PIN_TYPE pin);
+    #endif
 
     /*!
      \brief Set modem in fixed packet length mode.
diff --git a/src/modules/nRF24/nRF24.cpp b/src/modules/nRF24/nRF24.cpp
index d767dbd3..3b90ba70 100644
--- a/src/modules/nRF24/nRF24.cpp
+++ b/src/modules/nRF24/nRF24.cpp
@@ -516,6 +516,7 @@ uint8_t nRF24::randomByte() {
   return(0);
 }
 
+#if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
 void nRF24::setDirectAction(void (*func)(void)) {
   // nRF24 is unable to perform direct mode actions
   // this method is implemented only for PhysicalLayer compatibility
@@ -527,6 +528,7 @@ void nRF24::readBit(RADIOLIB_PIN_TYPE pin) {
   // this method is implemented only for PhysicalLayer compatibility
   (void)pin;
 }
+#endif
 
 void nRF24::clearIRQ() {
   // clear status bits
diff --git a/src/modules/nRF24/nRF24.h b/src/modules/nRF24/nRF24.h
index fead3bf1..8b6226dc 100644
--- a/src/modules/nRF24/nRF24.h
+++ b/src/modules/nRF24/nRF24.h
@@ -473,6 +473,7 @@ class nRF24: public PhysicalLayer {
    */
     uint8_t randomByte();
 
+    #if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
     /*!
       \brief Dummy method, to ensure PhysicalLayer compatibility.
 
@@ -486,6 +487,7 @@ class nRF24: public PhysicalLayer {
       \param pin Ignored.
     */
     void readBit(RADIOLIB_PIN_TYPE pin);
+    #endif
 
 #if !defined(RADIOLIB_GODMODE) && !defined(RADIOLIB_LOW_LEVEL)
   protected:
diff --git a/src/protocols/PhysicalLayer/PhysicalLayer.cpp b/src/protocols/PhysicalLayer/PhysicalLayer.cpp
index f0e62cd0..71185909 100644
--- a/src/protocols/PhysicalLayer/PhysicalLayer.cpp
+++ b/src/protocols/PhysicalLayer/PhysicalLayer.cpp
@@ -3,8 +3,10 @@
 PhysicalLayer::PhysicalLayer(float freqStep, size_t maxPacketLength) {
   _freqStep = freqStep;
   _maxPacketLength = maxPacketLength;
+  #if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
   _bufferBitPos = 0;
   _bufferWritePos = 0;
+  #endif
 }
 
 int16_t PhysicalLayer::transmit(__FlashStringHelper* fstr, uint8_t addr) {
@@ -188,6 +190,7 @@ int16_t PhysicalLayer::startDirect() {
   return(state);
 }
 
+#if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
 int16_t PhysicalLayer::available() {
   return(_bufferWritePos);
 }
@@ -246,6 +249,7 @@ void PhysicalLayer::updateDirectBuffer(uint8_t bit) {
     }
   }
 }
+#endif
 
 int16_t PhysicalLayer::setDIOMapping(RADIOLIB_PIN_TYPE pin, uint8_t value) {
   return(RADIOLIB_ERR_UNSUPPORTED);
diff --git a/src/protocols/PhysicalLayer/PhysicalLayer.h b/src/protocols/PhysicalLayer/PhysicalLayer.h
index e67dd1e8..efee97fb 100644
--- a/src/protocols/PhysicalLayer/PhysicalLayer.h
+++ b/src/protocols/PhysicalLayer/PhysicalLayer.h
@@ -261,6 +261,7 @@ class PhysicalLayer {
     */
     int16_t startDirect();
 
+    #if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
     /*!
       \brief Set sync word to be used to determine start of packet in direct reception mode.
 
@@ -299,6 +300,7 @@ class PhysicalLayer {
       \returns Byte from direct mode buffer.
     */
     uint8_t read();
+    #endif
 
     /*!
       \brief Configure DIO pin mapping to get a given signal on a DIO pin (if available).
@@ -311,8 +313,10 @@ class PhysicalLayer {
     */
     virtual int16_t setDIOMapping(RADIOLIB_PIN_TYPE pin, uint8_t value);
 
+#if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
   protected:
     void updateDirectBuffer(uint8_t bit);
+#endif
 
 #if !defined(RADIOLIB_GODMODE)
   private:
@@ -320,6 +324,7 @@ class PhysicalLayer {
     float _freqStep;
     size_t _maxPacketLength;
 
+    #if !defined(RADIOLIB_EXCLUDE_DIRECT_RECEIVE)
     uint8_t _bufferBitPos;
     uint8_t _bufferWritePos;
     uint8_t _bufferReadPos;
@@ -329,6 +334,7 @@ class PhysicalLayer {
     uint8_t _directSyncWordLen;
     uint32_t _directSyncWordMask;
     bool _gotSync;
+    #endif
 
     virtual Module* getMod() = 0;