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56476539cf
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.
47 lines
823 B
C
47 lines
823 B
C
/*
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* fw/spi.h - SPI I/O
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*
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* Written 2012 by Werner Almesberger
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* Copyright 2012 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef SPI_H
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#define SPI_H
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#include <stdint.h>
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void spi_init(void);
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void spi_begin(void);
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uint8_t spi_io(uint8_t v);
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void spi_end(void);
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/*
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* Interestingly, the #defines below produce slightly shorter code (6 bytes)
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* than the inlines.
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*/
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#if 0
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static inline void spi_send(uint8_t v)
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{
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spi_io(v);
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}
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static inline uint8_t spi_recv(void)
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{
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return spi_io(0);
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}
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#endif
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#define spi_send(v) spi_io(v)
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#define spi_recv() spi_io(0)
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#endif /* !SPI_H */
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