diff --git a/src/BuildOpt.h b/src/BuildOpt.h
index ba163c1d..12ecf778 100644
--- a/src/BuildOpt.h
+++ b/src/BuildOpt.h
@@ -55,6 +55,28 @@
   #define RADIOLIB_NONVOLATILE_READ_BYTE(addr)        pgm_read_byte(addr)
   #define RADIOLIB_TYPE_ALIAS(type, alias)            using alias = type;
 
+  // Arduino API callbacks
+  // the following are signatures of Arduino API functions of the custom platform
+  // for example, pinMode on Arduino Uno is defined as void pinMode(uint8_t pin, uint8_t mode)
+  // all fo the callbacks below are taken from Arduino Uno
+  #define RADIOLIB_CB_ARGS_PIN_MODE                   (void, pinMode, uint8_t pin, uint8_t mode)
+  #define RADIOLIB_CB_ARGS_DIGITAL_WRITE              (void, digitalWrite, uint8_t pin, uint8_t value)
+  #define RADIOLIB_CB_ARGS_DIGITAL_READ               (int, digitalRead, uint8_t pin)
+  #define RADIOLIB_CB_ARGS_TONE                       (void, tone, uint8_t _pin, unsigned int frequency, unsigned long duration)
+  #define RADIOLIB_CB_ARGS_NO_TONE                    (void, noTone, uint8_t _pin)
+  #define RADIOLIB_CB_ARGS_ATTACH_INTERRUPT           (void, attachInterrupt, uint8_t interruptNum, void (*userFunc)(void), int mode)
+  #define RADIOLIB_CB_ARGS_DETACH_INTERRUPT           (void, detachInterrupt, uint8_t interruptNum)
+  #define RADIOLIB_CB_ARGS_YIELD                      (void, yield, void)
+  #define RADIOLIB_CB_ARGS_DELAY                      (void, delay, unsigned long ms)
+  #define RADIOLIB_CB_ARGS_DELAY_MICROSECONDS         (void, delayMicroseconds, unsigned int us)
+  #define RADIOLIB_CB_ARGS_MILLIS                     (unsigned long, millis, void)
+  #define RADIOLIB_CB_ARGS_MICROS                     (unsigned long, micros, void)
+  #define RADIOLIB_CB_ARGS_SPI_BEGIN                  (void, SPIbegin, void)
+  #define RADIOLIB_CB_ARGS_SPI_BEGIN_TRANSACTION      (void, SPIbeginTransaction, void)
+  #define RADIOLIB_CB_ARGS_SPI_TRANSFER               (uint8_t, SPItransfer, uint8_t b)
+  #define RADIOLIB_CB_ARGS_SPI_END_TRANSACTION        (void, SPIendTransaction, void)
+  #define RADIOLIB_CB_ARGS_SPI_END                    (void, SPIend, void)
+
   // the following must be defined if the Arduino core does not support tone function
   //#define RADIOLIB_TONE_UNSUPPORTED
 
@@ -736,16 +758,8 @@
 #else
   // generic non-Arduino platform
   #define RADIOLIB_PLATFORM                           "Generic"
-  #define RADIOLIB_PIN_TYPE                           int
-  #define RADIOLIB_PIN_MODE                           int
-  #define RADIOLIB_PIN_STATUS                         int
-  #define RADIOLIB_INTERRUPT_STATUS                   RADIOLIB_PIN_STATUS
-  #define RADIOLIB_DIGITAL_PIN_TO_INTERRUPT(p)        (p)
-  #define RADIOLIB_NC                                 (-1)
-  #define RADIOLIB_DEFAULT_SPI                        SPI
-  #define RADIOLIB_NONVOLATILE                        PROGMEM
-  #define RADIOLIB_NONVOLATILE_READ_BYTE(addr)        pgm_read_byte(addr)
-  #define RADIOLIB_TYPE_ALIAS(type, alias)            using alias = type;
+
+  // platform properties may be defined here, or somewhere else in the build system
 
 #endif