Fix: Ext. timeout hang, examples, board support

- Initial support for Due and ATTiny boards
- Fix for 0 timeout period causing hang
- Remove unnecessary delays from startWrite
- Cleaned up/Updated example files
- Optimization is nearing completion

RF24_config.h

@@ -5,61 +5,129 @@
  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License
  version 2 as published by the Free Software Foundation.
+
+ Added Arduino Due support from https://github.com/mcrosson/
  */
 
 #ifndef __RF24_CONFIG_H__
 #define __RF24_CONFIG_H__
 
-#if ARDUINO < 100
-#include <WProgram.h>
-#else
-#include <Arduino.h>
-#endif
+  #if ARDUINO < 100
+	#include <WProgram.h>
+  #else
+	#include <Arduino.h>
+  #endif
 
-#include <stddef.h>
+  #include <stddef.h>
 
-// Stuff that is normally provided by Arduino
-#ifdef ARDUINO
-#include <SPI.h>
-#else
-#include <stdint.h>
-#include <stdio.h>
-#include <string.h>
-extern HardwareSPI SPI;
-#define _BV(x) (1<<(x))
-#endif
+  //TMRh20:
+  //#define MINIMAL
 
-#undef SERIAL_DEBUG
-#ifdef SERIAL_DEBUG
-#define IF_SERIAL_DEBUG(x) ({x;})
-#else
-#define IF_SERIAL_DEBUG(x)
-#endif
+  // Define _BV for non-Arduino platforms and for Arduino DUE
+  #if ! defined(ARDUINO) || (defined(ARDUINO) && defined(__arm__))
+	#define _BV(x) (1<<(x))
+  #endif
 
-// Avoid spurious warnings
-#if 1
-#if ! defined( NATIVE ) && defined( ARDUINO )
-#undef PROGMEM
-#define PROGMEM __attribute__(( section(".progmem.data") ))
-#undef PSTR
-#define PSTR(s) (__extension__({static const char __c[] PROGMEM = (s); &__c[0];}))
-#endif
-#endif
+  #undef SERIAL_DEBUG
+  #ifdef SERIAL_DEBUG
+	#define IF_SERIAL_DEBUG(x) ({x;})
+  #else
+	#define IF_SERIAL_DEBUG(x)
+  #endif
 
-// Progmem is Arduino-specific
-#ifdef ARDUINO
-#include <avr/pgmspace.h>
-#define PRIPSTR "%S"
-#else
-typedef char const char;
-typedef uint16_t prog_uint16_t;
-#define PSTR(x) (x)
-#define printf_P printf
-#define strlen_P strlen
-#define PROGMEM
-#define pgm_read_word(p) (*(p)) 
-#define PRIPSTR "%s"
-#endif
+  // Avoid spurious warnings
+  #if 1
+	#if ! defined( NATIVE ) && defined( ARDUINO ) && ! defined(__arm__)
+		#undef PROGMEM
+		#define PROGMEM __attribute__(( section(".progmem.data") ))
+		#undef PSTR
+		#define PSTR(s) (__extension__({static const char __c[] PROGMEM = (s); &__c[0];}))
+	#endif
+  #endif
+
+  // Progmem is Arduino-specific
+  #if defined(ARDUINO) && ! defined(__arm__)
+	#include <avr/pgmspace.h>
+	#define PRIPSTR "%S"
+  #else
+
+  	#if ! defined(ARDUINO)
+	  typedef char const char;
+      else // Fill in pgm_read_byte that is used, but missing from DUE
+	  #define pgm_read_byte(addr) (*(const unsigned char *)(addr))
+	#endif
+	typedef uint16_t prog_uint16_t;
+	#define PSTR(x) (x)
+	#define printf_P printf
+	#define strlen_P strlen
+	#define PROGMEM
+	#define pgm_read_word(p) (*(p))
+	#define PRIPSTR "%s"
+  #endif
+
+
+
+  // Stuff that is normally provided by Arduino
+  #if !defined ARDUINO
+
+	#include <stdint.h>
+	#include <stdio.h>
+	#include <string.h>
+	extern HardwareSPI SPI;
+  #else
+
+    #if !defined( __AVR_ATtiny85__ ) || defined( __AVR_ATtiny84__)
+	  #include <SPI.h>
+    #else
+	  #define ATTINY
+
+	  #define SPI_CLOCK_DIV4 0x00
+	  #define SPI_CLOCK_DIV16 0x01
+	  #define SPI_CLOCK_DIV64 0x02
+	  #define SPI_CLOCK_DIV128 0x03
+	  #define SPI_CLOCK_DIV2 0x04
+	  #define SPI_CLOCK_DIV8 0x05
+	  #define SPI_CLOCK_DIV32 0x06
+	  //#define SPI_CLOCK_DIV64 0x07
+
+	  #define SPI_MODE0 0x00
+	  #define SPI_MODE1 0x04
+	  #define SPI_MODE2 0x08
+	  #define SPI_MODE3 0x0C
+
+	  #define SPI_MODE_MASK 0x0C  // CPOL = bit 3, CPHA = bit 2 on SPCR
+	  #define SPI_CLOCK_MASK 0x03  // SPR1 = bit 1, SPR0 = bit 0 on SPCR
+	  #define SPI_2XCLOCK_MASK 0x01  // SPI2X = bit 0 on SPSR
+
+
+
+	  class SPIClass {
+	  public:
+	    inline static byte transfer(byte _data);
+
+	    static void begin(); // Default
+	    static void end();
+
+	    static void setDataMode(byte);
+	    static void setClockDivider(byte);
+	    static void setBitOrder(byte);
+	  };
+
+	  extern SPIClass SPI;
+
+	  byte SPIClass::transfer(byte _data){
+
+	  	USIDR = _data;
+	  	USISR = _BV(USIOIF);
+
+		while((USISR & _BV(USIOIF)) == 0){
+	    	USICR = _BV(USIWM0) | _BV(USICS1) | _BV(USICLK) | _BV(USITC);
+	  	}
+	  	return USIDR;
+	  }
+    #endif //ATTINY
+
+  #endif //Defined Arduino
 
 #endif // __RF24_CONFIG_H__
-// vim:ai:cin:sts=2 sw=2 ft=cpp
+