diff --git a/usbhost.h b/usbhost.h
index cf26c1f0..46ef1346 100644
--- a/usbhost.h
+++ b/usbhost.h
@@ -27,6 +27,9 @@ e-mail   :  support@circuitsathome.com
 #include <sys/types.h>
 #endif
 
+#if defined(RBL_NRF51822)
+#include "SPI.H"
+#endif
 /* SPI initialization */
 template< typename SPI_CLK, typename SPI_MOSI, typename SPI_MISO, typename SPI_SS > class SPi {
 public:
@@ -46,6 +49,13 @@ public:
                 SPI.begin();
                 SPI.setClockDivider(4); // Set speed to 84MHz/4=21MHz - the MAX3421E can handle up to 26MHz
         }
+#elif defined(RBL_NRF51822)
+        static void init() {
+                SPI_SS::SetDirWrite();
+                SPI_SS::Set();
+                SPI.begin();
+                // SPI.setFrequency(SPI_FREQUENCY_8M);
+        }
 #else
         static void init() {
                 //uint8_t tmp;
@@ -74,6 +84,8 @@ typedef SPi< Pb7, Pb5, Pb6, Pb4 > spi;
 typedef SPi< P13, P11, P12, P10 > spi;
 #elif defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)
 typedef SPi< P76, P75, P74, P10 > spi;
+#elif defined(RBL_NRF51822)
+typedef SPi< P16, P18, P17, P10 > spi;
 #else
 #error "No SPI entry in usbhost.h"
 #endif
@@ -135,7 +147,7 @@ void MAX3421e< SPI_SS, INTR >::regWr(uint8_t reg, uint8_t data) {
         c[0] = reg | 0x02;
         c[1] = data;
         spi4teensy3::send(c, 2);
-#elif defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)
+#elif (defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)) ||  defined(RBL_NRF51822)
         SPI.transfer(reg | 0x02);
         SPI.transfer(data);
 #else
@@ -159,7 +171,7 @@ uint8_t* MAX3421e< SPI_SS, INTR >::bytesWr(uint8_t reg, uint8_t nbytes, uint8_t*
         spi4teensy3::send(reg | 0x02);
         spi4teensy3::send(data_p, nbytes);
         data_p += nbytes;
-#elif defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)
+#elif (defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)) ||  defined(RBL_NRF51822)
         SPI.transfer(reg | 0x02);
         while(nbytes) {
                 SPI.transfer(*data_p);
@@ -201,7 +213,7 @@ uint8_t MAX3421e< SPI_SS, INTR >::regRd(uint8_t reg) {
         spi4teensy3::send(reg);
         uint8_t rv = spi4teensy3::receive();
         SPI_SS::Set();
-#elif defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)
+#elif (defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)) ||  defined(RBL_NRF51822)
         SPI.transfer(reg);
         uint8_t rv = SPI.transfer(0);
         SPI_SS::Set();
@@ -227,7 +239,7 @@ uint8_t* MAX3421e< SPI_SS, INTR >::bytesRd(uint8_t reg, uint8_t nbytes, uint8_t*
         spi4teensy3::send(reg);
         spi4teensy3::receive(data_p, nbytes);
         data_p += nbytes;
-#elif defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)
+#elif (defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)) ||  defined(RBL_NRF51822)
         SPI.transfer(reg);
         while(nbytes) {
             *data_p++ = SPI.transfer(0);