Werner's Miscellanea
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| 1 | /* |
| 2 | * gpio-xburst.c - Really primitive XBurst GPIO access |
| 3 | * |
| 4 | * Written 2010-2011 by Werner Almesberger |
| 5 | * Copyright 2010-2011 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 | |
| 14 | #include <stdlib.h> |
| 15 | #include <stdio.h> |
| 16 | #include <fcntl.h> |
| 17 | #include <sys/mman.h> |
| 18 | |
| 19 | #include "gpio-xburst.h" |
| 20 | |
| 21 | |
| 22 | #define BASE 0x10010000 |
| 23 | |
| 24 | |
| 25 | volatile void *mem; |
| 26 | |
| 27 | |
| 28 | void gpio_init(void) |
| 29 | { |
| 30 | int fd; |
| 31 | |
| 32 | fd = open("/dev/mem", O_RDWR | O_SYNC); |
| 33 | if (fd < 0) { |
| 34 | perror("/dev/mem"); |
| 35 | exit(1); |
| 36 | } |
| 37 | mem = mmap(NULL, 0x1000, PROT_READ | PROT_WRITE, MAP_SHARED, fd, BASE); |
| 38 | if (mem == MAP_FAILED) { |
| 39 | perror("mmap"); |
| 40 | exit(1); |
| 41 | } |
| 42 | } |
| 43 |
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