Adding SPI library and revising Ethernet library (Christian Maglie).

libraries/SPI/SPI.h

@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2010 by Cristian Maglie <c.maglie@bug.st>
+ * SPI Master library for arduino.
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of either the GNU General Public License version 2
+ * or the GNU Lesser General Public License version 2.1, both as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _SPI_H_INCLUDED
+#define _SPI_H_INCLUDED
+
+#include <stdio.h>
+#include <WProgram.h>
+#include <avr/pgmspace.h>
+
+enum SPIClockDivider {
+  SPI_ClkDiv_4,
+  SPI_ClkDiv_16,
+  SPI_ClkDiv_64,
+  SPI_ClkDiv_128,
+};
+
+enum SPIDataOrder {
+  SPI_DataOrder_LSB,
+  SPI_DataOrder_MSB,
+};
+
+enum SPIMode {
+  SPI_Mode_SampleRising,
+  SPI_Mode_SetupRising,
+  SPI_Mode_SampleFalling,
+  SPI_Mode_SetupFalling,
+};
+
+class SPIClass {
+public:
+  SPIClass();
+
+  inline static byte send(byte _data);
+
+  // SPI Configuration methods
+
+  inline static void attachInterrupt();
+  inline static void detachInterrupt(); // Default
+
+  inline static void begin(); // Default
+  inline static void end();
+
+  static void setDataOrder(SPIDataOrder);
+
+  static void setSPIMode(SPIMode);
+
+  static void setClockDivider(SPIClockDivider);
+  inline static void doubleSpeed();
+  inline static void noDoubleSpeed(); // Default
+};
+
+extern SPIClass SPI;
+
+byte SPIClass::send(byte _data) {
+  SPDR = _data;
+  while (!(SPSR & _BV(SPIF)))
+    ;
+  return SPDR;
+}
+
+void SPIClass::attachInterrupt() {
+  SPCR |= _BV(SPIE);
+}
+
+void SPIClass::detachInterrupt() {
+  SPCR &= ~_BV(SPIE);
+}
+
+void SPIClass::begin() {
+  SPCR |= _BV(SPE);
+}
+
+void SPIClass::end() {
+  SPCR &= ~_BV(SPE);
+}
+
+void SPIClass::doubleSpeed() {
+  SPSR |= _BV(SPI2X);
+}
+
+void SPIClass::noDoubleSpeed() {
+  SPSR &= ~_BV(SPI2X);
+}
+
+#endif