antorcha/fw/spi.h

/*
 * fw/spi.h - SPI I/O
 *
 * Written 2012 by Werner Almesberger
 * Copyright 2012 Werner Almesberger
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#ifndef SPI_H
#define	SPI_H

#include <stdint.h>


void spi_init(void);
void spi_begin(void);
uint8_t spi_io(uint8_t v);
void spi_end(void);


/*
 * Interestingly, the #defines below produce slightly shorter code (6 bytes)
 * than the inlines.
 */

#if 0
static inline void spi_send(uint8_t v)
{
	spi_io(v);
}


static inline uint8_t spi_recv(void)
{
	return spi_io(0);
}
#endif

#define	spi_send(v)	spi_io(v)
#define	spi_recv()	spi_io(0)

#endif /* !SPI_H */