xyFC/include/spi.h

/*
 * Bit-Banged SPI routines
 */

#ifndef _SPI_H
#define _SPI_H

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

#ifdef DEBUG

// Arduino D3 = PD3
#define SCK_on PORTD |= PD3
#define SCK_off PORTD &= ~(PD3)
#define SCK_dir DDRD |= (1 << PD3)

// Arduino D2 = PD2
#define MO_on PORTD |= PD2
#define MO_off PORTD &= ~(PD2)
#define MO_dir DDRD &= ~(1 << PD2)

// Arduino D8 = PB0
#define CS_on PORTB |= PB0
#define CS_off PORTB &= ~(PB0)
#define CS_dir DDRB |= (1 << PB0)

// Arduino D7 = PD7
#define MI_1 (PIND & PD7) == PD7
#define MI_0 (PIND & PD7) != PD7
#define MI_dir DDRD |= (1 << PD7)

// Arduino D9 = PB1
#define GDO_1 (PINB & PB1) == PB1
#define GDO_0 (PINB & PB1) != PB1
#define GDO_dir DDRB &= ~(1 << PB1)

#else

#define SCK_on PORTB |= PB4
#define SCK_off PORTB &= ~(PB4)
#define SCK_dir DDRB |= (1 << PB4)

#define MO_on PORTB |= PB3
#define MO_off PORTB &= ~(PB3)
#define MO_dir DDRB &= ~(1 << PB3)

#define CS_on PORTB |= PB1
#define CS_off PORTB &= ~(PB1)
#define CS_dir DDRB |= (1 << PB1)

#define MI_1 (PINB & PB2) == PB2
#define MI_0 (PINB & PB2) != PB2
#define MI_dir DDRB |= (1 << PB2)

#define GDO_1 (PINB & PB0) == PB0
#define GDO_0 (PINB & PB0) != PB0
#define GDO_dir DDRB &= ~(1 << PB0)

#endif

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

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

#endif