avrbus.h

/*
* SPI Expansion bus driver - addressable spi bus with 1Mbs throughput at 16Mhz F_CPU
*
* Martin Schröder, info@fortmax.se
* http://github.com/mkschreder
*
* Released under GPLv3
*/


#ifndef _SPI_H_
#define _SPI_H_

#ifdef __cplusplus
extern "C" {
#endif

#include <avr/io.h>

//spi ports
#define SPI_DDR DDRB
#define SPI_PORT PORTB
#define SPI_PIN PINB

#define SPI_CE PB0
#define SPI_RDY PB1
#define SPI_SS PB2
#define SPI_MOSI PB3
#define SPI_MISO PB4
#define SPI_SCK PB5

uint8_t bus_exchange_byte(uint8_t data);

void bus_master_init(void); 
void bus_slave_init(uint16_t base_addr, char *buf, uint8_t size);
uint8_t bus_read(uint16_t addr, char *data, uint8_t size);
uint8_t bus_write(uint16_t addr, const char *data, uint8_t size);

#ifdef __cplusplus
} 
#endif

#endif