diff --git a/Adafruit_SPIDevice.cpp b/Adafruit_SPIDevice.cpp
index dc3672b..f92956f 100644
--- a/Adafruit_SPIDevice.cpp
+++ b/Adafruit_SPIDevice.cpp
@@ -2,6 +2,24 @@
 
 // #define DEBUG_SERIAL Serial
 
+
+#ifdef BUSIO_USE_FAST_PINIO
+#define BUSIO_SET_CLOCK_LOW() (*clkPort = *clkPort & ~clkPinMask)
+#define BUSIO_SET_CLOCK_HIGH() (*clkPort = *clkPort | clkPinMask)
+#define BUSIO_READ_MISO() (*misoPort & misoPinMask)
+#define BUSIO_WRITE_MOSI(value) do { \
+    if (value) \
+        *mosiPort = *mosiPort | mosiPinMask; \
+    else \
+        *mosiPort = *mosiPort & ~mosiPinMask; \
+} while(0)
+#else
+#define BUSIO_SET_CLOCK_LOW() digitalWrite(_sck, LOW)
+#define BUSIO_SET_CLOCK_HIGH() digitalWrite(_sck, HIGH)
+#define BUSIO_READ_MISO() digitalRead(_miso)
+#define BUSIO_WRITE_MOSI(value) digitalWrite(_mosi, value)
+#endif
+
 /*!
  *    @brief  Create an SPI device with the given CS pin and settings
  *    @param  cspin The arduino pin number to use for chip select
@@ -181,77 +199,40 @@ void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
       if (_dataMode == SPI_MODE0 || _dataMode == SPI_MODE2) {
         towrite = send & b;
         if ((_mosi != -1) && (lastmosi != towrite)) {
-#ifdef BUSIO_USE_FAST_PINIO
-          if (towrite)
-            *mosiPort = *mosiPort | mosiPinMask;
-          else
-            *mosiPort = *mosiPort & ~mosiPinMask;
-#else
-          digitalWrite(_mosi, towrite);
-#endif
+          BUSIO_WRITE_MOSI(towrite);
           lastmosi = towrite;
         }
 
-#ifdef BUSIO_USE_FAST_PINIO
-        *clkPort = *clkPort | clkPinMask; // Clock high
-#else
-        digitalWrite(_sck, HIGH);
-#endif
+        BUSIO_SET_CLOCK_HIGH();
 
         if (bitdelay_us) {
           delayMicroseconds(bitdelay_us);
         }
 
         if (_miso != -1) {
-#ifdef BUSIO_USE_FAST_PINIO
-          if (*misoPort & misoPinMask) {
-#else
-          if (digitalRead(_miso)) {
-#endif
+          if (BUSIO_READ_MISO())
             reply |= b;
           }
         }
 
-#ifdef BUSIO_USE_FAST_PINIO
-        *clkPort = *clkPort & ~clkPinMask; // Clock low
-#else
-        digitalWrite(_sck, LOW);
-#endif
+        BUSIO_SET_CLOCK_LOW();
+
       } else { // if (_dataMode == SPI_MODE1 || _dataMode == SPI_MODE3)
 
-#ifdef BUSIO_USE_FAST_PINIO
-        *clkPort = *clkPort | clkPinMask; // Clock high
-#else
-        digitalWrite(_sck, HIGH);
-#endif
+        BUSIO_SET_CLOCK_HIGH();
 
         if (bitdelay_us) {
           delayMicroseconds(bitdelay_us);
         }
 
         if (_mosi != -1) {
-#ifdef BUSIO_USE_FAST_PINIO
-          if (send & b)
-            *mosiPort = *mosiPort | mosiPinMask;
-          else
-            *mosiPort = *mosiPort & ~mosiPinMask;
-#else
-          digitalWrite(_mosi, send & b);
-#endif
+          BUSIO_WRITE_MOSI(send & b);
         }
 
-#ifdef BUSIO_USE_FAST_PINIO
-        *clkPort = *clkPort & ~clkPinMask; // Clock low
-#else
-        digitalWrite(_sck, LOW);
-#endif
+        BUSIO_SET_CLOCK_LOW();
 
         if (_miso != -1) {
-#ifdef BUSIO_USE_FAST_PINIO
-          if (*misoPort & misoPinMask) {
-#else
-          if (digitalRead(_miso)) {
-#endif
+          if (BUSIO_READ_MISO()) {
             reply |= b;
           }
         }