diff --git a/keywords.txt b/keywords.txt
index e576da1..a678665 100644
--- a/keywords.txt
+++ b/keywords.txt
@@ -107,6 +107,7 @@ setTextColor	KEYWORD2
 setTextSize	KEYWORD2
 setTextWrap	KEYWORD2
 SPItransfer	KEYWORD2
+SPItransferAndRead	KEYWORD2
 systemButtons	KEYWORD2
 toggle	KEYWORD2
 waitNoButtons	KEYWORD2
diff --git a/src/Arduboy2Core.cpp b/src/Arduboy2Core.cpp
index d475d26..e242793 100644
--- a/src/Arduboy2Core.cpp
+++ b/src/Arduboy2Core.cpp
@@ -251,6 +251,13 @@ void Arduboy2Core::SPItransfer(uint8_t data)
   while (!(SPSR & _BV(SPIF))) { } // wait
 }
 
+// Write to and read from the SPI bus (out to MOSI pin, in from MISO pin)
+uint8_t Arduboy2Core::SPItransferAndRead(uint8_t data)
+{
+  SPItransfer(data);
+  return SPDR;
+}
+
 void Arduboy2Core::safeMode()
 {
   if (buttonsState() == UP_BUTTON)
diff --git a/src/Arduboy2Core.h b/src/Arduboy2Core.h
index 0f595f3..8df55ce 100644
--- a/src/Arduboy2Core.h
+++ b/src/Arduboy2Core.h
@@ -402,10 +402,32 @@ class Arduboy2Core : public Arduboy2NoUSB
      * or as data to be placed on the screen, depending on the command/data
      * mode.
      *
-     * \see LCDDataMode() LCDCommandMode() sendLCDCommand()
+     * \see LCDDataMode() LCDCommandMode() sendLCDCommand() SPItransferAndRead()
      */
     static void SPItransfer(uint8_t data);
 
+    /** \brief
+     * Transfer a byte to, and read a byte from, the SPI bus.
+     *
+     * \param data The byte to be sent.
+     *
+     * \return The byte that was received.
+     *
+     * \details
+     * This function does the same as the `SPItransfer()` function but also
+     * reads and returns the byte of data that was received during the
+     * transfer.
+     *
+     * This function is of no use for a standard Arduboy, since only the
+     * display is connected to the SPI bus and data cannot be received from
+     * the display. It has been provided for use with homemade or expanded
+     * units that have had additional peripherals added to the SPI bus that
+     * are capable of sending data.
+     *
+     * \see SPItransfer()
+     */
+    static uint8_t SPItransferAndRead(uint8_t data);
+
     /** \brief
      * Turn the display off.
      *