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7fd9044d94
This decreases the retrieval time for a frame of 102 bytes from 660 us to 384 us, corresponding to a speed change from about 1.26 Mbps to 2.17 Mbps (102 bytes plus 2 bytes overhead).
31 lines
687 B
C
31 lines
687 B
C
/*
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* fw/spi.h - ATmega8 family SPI I/O
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*
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* Written 2011, 2013 by Werner Almesberger
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* Copyright 2011, 2013 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_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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void spi_off(void);
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void spi_init(void);
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#define spi_send(v) (void) spi_io(v)
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#define spi_recv(v) spi_io(0)
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void spi_recv_block(uint8_t *buf, uint8_t n);
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#endif /* !SPI_H */
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