spi.h

#ifndef SPI_H

#define SPI_H

#include <stdint.h>

#include <avr/io.h>

#if defined (__AVR_ATmega32__)

#define SPI_PORT PORTB

#define SPI_DDR DDRB

#define SCK_PIN PB7

#define MISO_PIN PB6

#define MOSI_PIN PB5

#define SS_DDR DDRB

#define SS_PORT PORTB

#define SS_PIN PB4

#elif defined (__AVR_ATmega168__)

#define SPI_PORT PORTB

#define SPI_DDR DDRB

#define SCK_PIN PB5

#define MISO_PIN PB4

#define MOSI_PIN PB3

#define SS_DDR DDRB

#define SS_PORT PORTB

#define SS_PIN PB1

#endif

#define LOW 0

#define HIGH 1

#define SPI_RESET    0xC0

#define  SPI_READ    0x03

#define  SPI_READ_RX    0x90

#define  SPI_WRITE    0x02

#define  SPI_WRITE_TX  0x40

#define  SPI_RTS      0x80

#define SPI_READ_STATUS  0xA0

#define  SPI_RX_STATUS  0xB0

#define  SPI_BIT_MODIFY  0x05

uint8_t init_spi();

void set_cs(uint8_t state);

uint8_t spi_putc(uint8_t data);

void write_register(uint8_t address, uint8_t data);

uint8_t read_register(uint8_t address);

void modify_register(uint8_t address, uint8_t mask, uint8_t data);

void set_bit(uint8_t address, uint8_t bit, uint8_t value);

#endif