diff --git a/README.md b/README.md
index 1a3163b3..4d84061f 100644
--- a/README.md
+++ b/README.md
@@ -99,6 +99,8 @@ Currently the following boards are supported by the library:
 * Balanduino
 * Sanguino
 * Black Widdow
+* RedBearLab nRF51822
+    * If you are using the RedBearLab nRF51822, then you must include the RedBearLab SPI library like so: ```#include <SPI.h>``` in your .ino file.
 
 The following boards need to be activated manually in [settings.h](settings.h):
 
diff --git a/avrpins.h b/avrpins.h
index da80349d..262bb6e2 100644
--- a/avrpins.h
+++ b/avrpins.h
@@ -961,6 +961,58 @@ MAKE_PIN(P78, PIOB, PIO_PB23); // Unconnected
 
 #undef MAKE_PIN
 
+#elif defined(RBL_NRF51822)
+
+#define MAKE_PIN(className, pin) \
+class className { \
+public: \
+    static void Set() { \
+        nrf_gpio_pin_set(pin); \
+    } \
+    static void Clear() { \
+        nrf_gpio_pin_clear(pin); \
+    } \
+    static void SetDirRead() { \
+        nrf_gpio_cfg_input(pin, NRF_GPIO_PIN_NOPULL); \
+    } \
+    static void SetDirWrite() { \
+        nrf_gpio_cfg_output(pin); \
+    } \
+    static uint8_t IsSet() { \
+        return (uint8_t)nrf_gpio_pin_read(pin); \
+    } \
+};
+
+// See: pin_transform.c in RBL nRF51822 SDK
+MAKE_PIN(P0, Pin_nRF51822_to_Arduino(D0));
+MAKE_PIN(P1, Pin_nRF51822_to_Arduino(D1));
+MAKE_PIN(P2, Pin_nRF51822_to_Arduino(D2));
+MAKE_PIN(P3, Pin_nRF51822_to_Arduino(D3));
+MAKE_PIN(P4, Pin_nRF51822_to_Arduino(D4));
+MAKE_PIN(P5, Pin_nRF51822_to_Arduino(D5));
+MAKE_PIN(P6, Pin_nRF51822_to_Arduino(D6));
+MAKE_PIN(P7, Pin_nRF51822_to_Arduino(D7));
+MAKE_PIN(P8, Pin_nRF51822_to_Arduino(D8));
+MAKE_PIN(P9, Pin_nRF51822_to_Arduino(D9)); // INT
+MAKE_PIN(P10, Pin_nRF51822_to_Arduino(D10)); // SS
+MAKE_PIN(P11, Pin_nRF51822_to_Arduino(D11));
+MAKE_PIN(P12, Pin_nRF51822_to_Arduino(D12));
+MAKE_PIN(P13, Pin_nRF51822_to_Arduino(D13));
+MAKE_PIN(P14, Pin_nRF51822_to_Arduino(D14));
+MAKE_PIN(P15, Pin_nRF51822_to_Arduino(D15));
+MAKE_PIN(P17, Pin_nRF51822_to_Arduino(D17)); // MISO
+MAKE_PIN(P18, Pin_nRF51822_to_Arduino(D18)); // MOSI
+MAKE_PIN(P16, Pin_nRF51822_to_Arduino(D16)); // CLK
+MAKE_PIN(P19, Pin_nRF51822_to_Arduino(D19));
+MAKE_PIN(P20, Pin_nRF51822_to_Arduino(D20));
+MAKE_PIN(P21, Pin_nRF51822_to_Arduino(D21));
+MAKE_PIN(P22, Pin_nRF51822_to_Arduino(D22));
+MAKE_PIN(P23, Pin_nRF51822_to_Arduino(D23));
+MAKE_PIN(P24, Pin_nRF51822_to_Arduino(D24));
+
+#undef MAKE_PIN
+
+
 #else
 #error "Please define board in avrpins.h"
 
diff --git a/settings.h b/settings.h
index e3d0ed1d..cc02f583 100644
--- a/settings.h
+++ b/settings.h
@@ -137,8 +137,8 @@ e-mail   :  support@circuitsathome.com
 #define USING_SPI4TEENSY3 0
 #endif
 
-#if defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)
-#include <SPI.h> // Use the Arduino SPI library for the Arduino Due
+#if (defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)) || defined(RBL_NRF51822)
+#include <SPI.h> // Use the Arduino SPI library for the Arduino Due and RedBearLab nRF51822
 #endif
 
 #endif	/* SETTINGS_H */
diff --git a/usbhost.h b/usbhost.h
index cf26c1f0..f35bc0f4 100644
--- a/usbhost.h
+++ b/usbhost.h
@@ -27,6 +27,7 @@ e-mail   :  support@circuitsathome.com
 #include <sys/types.h>
 #endif
 
+
 /* SPI initialization */
 template< typename SPI_CLK, typename SPI_MOSI, typename SPI_MISO, typename SPI_SS > class SPi {
 public:
@@ -46,6 +47,13 @@ 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 +82,8 @@ 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 +145,7 @@ 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 +169,7 @@ 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 +211,7 @@ 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 +237,7 @@ 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);