xyFC/include/spi.h

/*
 * Bit-Banged SPI routines
 */

#ifndef _SPI_H
#define _SPI_H

#include <stdint.h>
#include <avr/io.h>

#ifdef DEBUG

// Arduino D2
#define SCK_on PORTD |= PD2
#define SCK_off PORTD &= ~(PD2)

// Arduino D4
#define MO_on PORTD |= PD4
#define MO_off PORTD &= ~(PD4)

// Arduino D7
#define CS_on PORTD |= PD7
#define CS_off PORTD &= ~(PD7)

// Arduino D8
#define MI_1 (PINB & PB0) == PB0
#define MI_0 (PINB & PB0) != PB0

// Arduino D12
#define GDO_1 (PINB & PB4) == PB4
#define GDO_0 (PINB & PB4) != PB4

#else

#define SCK_on PORTB |= PB4
#define SCK_off PORTB &= ~(PB4)

#define MO_on PORTB |= PB3
#define MO_off PORTB &= ~(PB3)

#define CS_on PORTB |= PB1
#define CS_off PORTB &= ~(PB1)

#define MI_1 (PINB & PB2) == PB2
#define MI_0 (PINB & PB2) != PB2

#define GDO_1 (PINB & PB0) == PB0
#define GDO_0 (PINB & PB0) != PB0

#endif

#define NOP() __asm__ __volatile__("nop")

void spiInit(void);
void spiWrite(uint8_t command);
uint8_t spiRead(void);

#endif