spi.h

   1 /*
   2  Copyright (C) 2012 jaseg <s@jaseg.de>
   3
   4  This program is free software; you can redistribute it and/or
   5  modify it under the terms of the GNU General Public License
   6  version 3 as published by the Free Software Foundation.
   7  */
   8
   9 #ifndef __SPI_H__
  10 #define __SPI_H__
  11
  12 #include <avr/io.h>
  13
  14 #define SPI_MOSI_PORT   PORTB
  15 #define SPI_MOSI_DDR    DDRB
  16 #define SPI_MOSI_PIN    2
  17
  18 #define SPI_SCK_PORT    PORTB
  19 #define SPI_SCK_DDR     DDRB
  20 #define SPI_SCK_PIN     1
  21
  22 void spi_begin(void);
  23
  24 void spi_end(void);
  25
  26 void spi_setup(uint8_t config);
  27 #define SPI_MSBFIRST 0
  28 #define SPI_LSBFIRST _BV(DORD)
  29 #define SPI_MODE0 0
  30 #define SPI_MODE1 _BV(CPHA)
  31 #define SPI_MODE2 _BV(CPOL)
  32 #define SPI_MODE3 (_BV(CPHA) | _BV(CPOL))
  33 //To avoid passing more than 1 byte to the setup function, the SPI2X bit is mapped onto the SPE bit here
  34 #define SPI_CLOCK_DIV2 _BV(SPE)
  35 #define SPI_CLOCK_DIV4 0
  36 #define SPI_CLOCK_DIV8 (_BV(SPE) | _BV(SPR0))
  37 #define SPI_CLOCK_DIV16 _BV(SPR0)
  38 #define SPI_CLOCK_DIV32 (_BV(SPE) | _BV(SPR1))
  39 #define SPI_CLOCK_DIV64 _BV(SPR1)
  40 #define SPI_CLOCK_DIV128 (_BV(SPR1) | _BV(SPR0))
  41
  42 uint8_t spi_transfer(uint8_t data);
  43
  44 #endif//__SPI_H__