1 /* 2 * Copyright (c) 2010 by Cristian Maglie <c.maglie (at) bug.st> 3 * SPI Master library for arduino. 4 * 5 * This file is free software; you can redistribute it and/or modify 6 * it under the terms of either the GNU General Public License version 2 7 * or the GNU Lesser General Public License version 2.1, both as 8 * published by the Free Software Foundation. 9 */ 10 11 #ifndef _SPI_H_INCLUDED 12 #define _SPI_H_INCLUDED 13 14 #include <stdio.h> 15 #include <WProgram.h> 16 #include <avr/pgmspace.h> 17 18 #define SPI_CLOCK_DIV4 0x00 19 #define SPI_CLOCK_DIV16 0x01 20 #define SPI_CLOCK_DIV64 0x02 21 #define SPI_CLOCK_DIV128 0x03 22 #define SPI_CLOCK_DIV2 0x04 23 #define SPI_CLOCK_DIV8 0x05 24 #define SPI_CLOCK_DIV32 0x06 25 #define SPI_CLOCK_DIV64 0x07 26 27 #define SPI_MODE0 0x00 28 #define SPI_MODE1 0x04 29 #define SPI_MODE2 0x08 30 #define SPI_MODE3 0x0C 31 32 #define SPI_MODE_MASK 0x0C // CPOL = bit 3, CPHA = bit 2 on SPCR 33 #define SPI_CLOCK_MASK 0x03 // SPR1 = bit 1, SPR0 = bit 0 on SPCR 34 #define SPI_2XCLOCK_MASK 0x01 // SPI2X = bit 0 on SPSR 35 36 class SPIClass { 37 public: 38 inline static byte transfer(byte _data); 39 40 // SPI Configuration methods 41 42 inline static void attachInterrupt(); 43 inline static void detachInterrupt(); // Default 44 45 static void begin(); // Default 46 static void end(); 47 48 static void setBitOrder(uint8_t); 49 static void setDataMode(uint8_t); 50 static void setClockDivider(uint8_t); 51 }; 52 53 extern SPIClass SPI; 54 55 byte SPIClass::transfer(byte _data) { 56 SPDR = _data; 57 while (!(SPSR & _BV(SPIF))) 58 ; 59 return SPDR; 60 } 61 62 void SPIClass::attachInterrupt() { 63 SPCR |= _BV(SPIE); 64 } 65 66 void SPIClass::detachInterrupt() { 67 SPCR &= ~_BV(SPIE); 68 } 69 70 #endif 71
