/* 
 *
 *
 *
 *
 *
 */


#ifndef SPI_H_
#define SPI_H_

#include <avr/io.h>


#define SPI_SS_PIN PORTA1		//DEBUG 
#define SPI_SCK_PIN PORTB7
#define SPI_MOSI_PIN PORTB5
#define SPI_MISO_PIN PORTB6


// SPI clock modes
#define SPI_MODE_0 0x00 /* Sample (Rising) Setup (Falling) CPOL=0, CPHA=0 */
#define SPI_MODE_1 0x01 /* Setup (Rising) Sample (Falling) CPOL=0, CPHA=1 */
#define SPI_MODE_2 0x02 /* Sample (Falling) Setup (Rising) CPOL=1, CPHA=0 */
#define SPI_MODE_3 0x03 /* Setup (Falling) Sample (Rising) CPOL=1, CPHA=1 */

// data direction
#define SPI_LSB 1 /* send least significant bit (bit 0) first */
#define SPI_MSB 0 /* send most significant bit (bit 7) first */

// whether to raise interrupt when data received (SPIF bit received)
#define SPI_NO_INTERRUPT 0
#define SPI_INTERRUPT 1

// slave or master with clock diviser
#define SPI_SLAVE 0xF0
#define SPI_MSTR_CLK4 0x00 /* chip clock/4 */
#define SPI_MSTR_CLK16 0x01 /* chip clock/16 */
#define SPI_MSTR_CLK64 0x02 /* chip clock/64 */
#define SPI_MSTR_CLK128 0x03 /* chip clock/128 */
#define SPI_MSTR_CLK2 0x04 /* chip clock/2 */
#define SPI_MSTR_CLK8 0x05 /* chip clock/8 */
#define SPI_MSTR_CLK32 0x06 /* chip clock/32 */



// setup spi
void setup_spi(uint8_t mode,   // timing mode SPI_MODE[0-4]
	       int dord,             // data direction SPI_LSB|SPI_MSB
	       int interrupt,        // whether to raise interrupt on recieve
	       uint8_t clock); // clock diviser

// disable spi
void disable_spi(void);

// send and receive a byte of data (master mode)
uint8_t send_spi(uint8_t out);

// receive the byte of data waiting on the SPI buffer and
// set the next byte to transfer - for use in slave mode
// when interrupts are enabled.
uint8_t received_from_spi(uint8_t out);



#endif /* SPI_H_ */