Added support for the Arduino Due

Untested

UsbCore.h

@@ -24,7 +24,7 @@ typedef MAX3421e<P53, P54> MAX3421E; // Arduino Mega ADK
 #elif defined(ARDUINO_AVR_BALANDUINO)
 typedef MAX3421e<P20, P19> MAX3421E; // Balanduino
 #else
-typedef MAX3421e<P10, P9> MAX3421E; // Official Arduinos (UNO, Duemilanove, Mega, 2560, Leonardo etc.) or Teensy 2.0 and 3.0
+typedef MAX3421e<P10, P9> MAX3421E; // Official Arduinos (UNO, Duemilanove, Mega, 2560, Leonardo, Due etc.) or Teensy 2.0 and 3.0
 #endif
 
 /* Common setup data constant combinations  */

avrpins.h

@@ -749,11 +749,13 @@ public:
 
 #endif // __AVR__
 
-#if defined(__arm__) && defined(CORE_TEENSY)
+#if defined(__arm__)
 
 // pointers are 32 bits on ARM
 #define pgm_read_pointer(p) pgm_read_dword(p)
 
+#if defined(CORE_TEENSY) && (defined(__MK20DX128__) || defined(__MK20DX256__))
+
 #include "core_pins.h"
 #include "avr_emulation.h"
 
@@ -819,6 +821,57 @@ MAKE_PIN(P33, CORE_PIN33_PORTREG, CORE_PIN33_BIT, CORE_PIN33_CONFIG);
 
 #undef MAKE_PIN
 
+#elif defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)
+
+// Disable interrupts
+// Enable the pull up resistor
+// Set to INPUT
+// Enable PIO
+
+// Disable interrupts
+// Disable the pull up resistor
+// Set to OUTPUT
+// Enable PIO
+
+#define MAKE_PIN(className, baseReg, pinMask) \
+class className { \
+public: \
+  static void Set() { \
+    baseReg->PIO_SODR = pinMask; \
+  } \
+  static void Clear() { \
+    baseReg->PIO_CODR = pinMask; \
+  } \
+  static void SetDirRead() { \
+    baseReg->PIO_IDR = pinMask ; \
+    baseReg->PIO_PUER = pinMask; \
+    baseReg->PIO_ODR = pinMask; \
+    baseReg->PIO_PER = pinMask; \
+  } \
+  static void SetDirWrite() { \
+    baseReg->PIO_IDR = pinMask ; \
+    baseReg->PIO_PUDR = pinMask; \
+    baseReg->PIO_OER = pinMask; \
+    baseReg->PIO_PER = pinMask; \
+  } \
+  static uint8_t IsSet() { \
+    return baseReg->PIO_PDSR & pinMask; \
+  } \
+};
+
+MAKE_PIN(P9, PIOC, PIO_PC21); // INT
+MAKE_PIN(P10, PIOC, PIO_PC29); // SS
+MAKE_PIN(P74, PIOA, PIO_PA25); // MISO
+MAKE_PIN(P75, PIOA, PIO_PA26); // MOSI
+MAKE_PIN(P76, PIOA, PIO_PA27); // CLK
+
+#undef MAKE_PIN
+
+#else
+#error "Please define board in avrpins.h"
+
+#endif
+
 #endif // __arm__
 
 #endif //_avrpins_h_

settings.h

@@ -68,7 +68,6 @@
 // No user serviceable parts below this line.
 // DO NOT change anything below here unless you are a developer!
 
-// When will we drop support for the older bug-ridden stuff?
 #if defined(ARDUINO) && ARDUINO >=100
 #include <Arduino.h>
 #else
@@ -79,7 +78,7 @@
 #define F(str) (str)
 #endif
 
-#ifdef __GNUC__
+#if defined(__GNUC__) && defined(__AVR__)
 #ifndef GCC_VERSION
 #define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
 #endif
@@ -110,10 +109,14 @@
 #define XMEM_RELEASE_SPI() (void(0))
 #endif
 
-#if defined(__MK20DX128__) || defined(__MK20DX256__)
+#if defined(CORE_TEENSY) && (defined(__MK20DX128__) || defined(__MK20DX256__))
 #define USING_SPI4TEENSY3 USE_SPI4TEENSY3
 #else
 #define USING_SPI4TEENSY3 0
 #endif
 
+#if defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)
+#include <SPI.h> // Use the Arduino SPI library for the Arduino Due
+#endif
+
 #endif	/* SETTINGS_H */

usbhost.h

@@ -29,9 +29,8 @@ e-mail   :  support@circuitsathome.com
 
 /* SPI initialization */
 template< typename SPI_CLK, typename SPI_MOSI, typename SPI_MISO, typename SPI_SS > class SPi {
-#if USING_SPI4TEENSY3
 public:
-
+#if USING_SPI4TEENSY3
         static void init() {
                 // spi4teensy3 inits everything for us, except /SS
                 // CLK, MOSI and MISO are hard coded for now.
@@ -40,10 +39,13 @@ public:
                 SPI_SS::SetDirWrite();
                 SPI_SS::Set();
         }
-
+#elif defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)
+        static void init() {
+                SPI_SS::SetDirWrite();
+                SPI_SS::Set();
+                SPI.begin();
+        }
 #else
-public:
-
         static void init() {
                 //uint8_t tmp;
                 SPI_CLK::SetDirWrite();
@@ -67,8 +69,10 @@ typedef SPi< Pb1, Pb2, Pb3, Pb0 > spi;
 typedef SPi< Pb5, Pb3, Pb4, Pb2 > spi;
 #elif defined(__AVR_ATmega644__) || defined(__AVR_ATmega644P__) || defined(__AVR_ATmega1284__) || defined(__AVR_ATmega1284P__)
 typedef SPi< Pb7, Pb5, Pb6, Pb4 > spi;
-#elif defined(__MK20DX128__) || defined(__MK20DX256__)
+#elif defined(CORE_TEENSY) && (defined(__MK20DX128__) || defined(__MK20DX256__))
 typedef SPi< P13, P11, P12, P10 > spi;
+#elif defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)
+typedef SPi< P76, P75, P74, P10 > spi;
 #else
 #error "No SPI entry in usbhost.h"
 #endif
@@ -130,6 +134,9 @@ 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__)
+        SPI.transfer(reg | 0x02);
+        SPI.transfer(data);
 #else
         SPDR = (reg | 0x02);
         while(!(SPSR & (1 << SPIF)));
@@ -151,6 +158,13 @@ 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__)
+        SPI.transfer(reg | 0x02);
+        while(nbytes) {
+                SPI.transfer(*data_p);
+                nbytes--;
+                data_p++; // advance data pointer
+        }
 #else
         SPDR = (reg | 0x02); //set WR bit and send register number
         while(nbytes) {
@@ -186,6 +200,10 @@ 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__)
+        SPI.transfer(reg);
+        uint8_t rv = SPI.transfer(0);
+        SPI_SS::Set();
 #else
         SPDR = reg;
         while(!(SPSR & (1 << SPIF)));
@@ -208,6 +226,12 @@ 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__)
+        SPI.transfer(reg);
+        while(nbytes) {
+            *data_p++ = SPI.transfer(0);
+            nbytes--;
+        }
 #else
         SPDR = reg;
         while(!(SPSR & (1 << SPIF))); //wait