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| Source at commit 0e9b093d2ee3f8195e9848f5a931c2068d37e59f created 11 years 1 day ago. By Werner Almesberger, tornado/cpu/cpu.brd: improve 3V3 routing | |
|---|---|
| 1 | /* |
| 2 | * fw/spi.h - SPI I/O |
| 3 | * |
| 4 | * Written 2012 by Werner Almesberger |
| 5 | * Copyright 2012 Werner Almesberger |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | #ifndef SPI_H |
| 14 | #define SPI_H |
| 15 | |
| 16 | #include <stdint.h> |
| 17 | |
| 18 | |
| 19 | void spi_init(void); |
| 20 | void spi_begin(void); |
| 21 | uint8_t spi_io(uint8_t v); |
| 22 | void spi_end(void); |
| 23 | |
| 24 | |
| 25 | /* |
| 26 | * Interestingly, the #defines below produce slightly shorter code (6 bytes) |
| 27 | * than the inlines. |
| 28 | */ |
| 29 | |
| 30 | #if 0 |
| 31 | static inline void spi_send(uint8_t v) |
| 32 | { |
| 33 | spi_io(v); |
| 34 | } |
| 35 | |
| 36 | |
| 37 | static inline uint8_t spi_recv(void) |
| 38 | { |
| 39 | return spi_io(0); |
| 40 | } |
| 41 | #endif |
| 42 | |
| 43 | #define spi_send(v) spi_io(v) |
| 44 | #define spi_recv() spi_io(0) |
| 45 | |
| 46 | #endif /* !SPI_H */ |
| 47 | |
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tornado-v1
