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antorcha/fw/spi.h
Werner Almesberger 56476539cf fw/: addition of boot loader (WIP) and assorted cleanup and improvements
The boot loader currently uses the protocol switch intended for the
application. This makes it too big to fit in the very limiting
constraints the ATmega168 poses - and there's not even cryptographic
authentication yet. We'll have to dumb it down quite a bit.
2012-06-18 10:56:43 -03:00

47 lines
823 B
C

/*
* 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 */