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43 lines
828 B
C
43 lines
828 B
C
/*
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* gpio-xburst.c - Really primitive XBurst GPIO access
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*
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* Written 2010-2011 by Werner Almesberger
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* Copyright 2010-2011 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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#include <stdlib.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include "gpio-xburst.h"
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#define BASE 0x10010000
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volatile void *mem;
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void gpio_init(void)
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{
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int fd;
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fd = open("/dev/mem", O_RDWR | O_SYNC);
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if (fd < 0) {
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perror("/dev/mem");
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exit(1);
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}
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mem = mmap(NULL, 0x1000, PROT_READ | PROT_WRITE, MAP_SHARED, fd, BASE);
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if (mem == MAP_FAILED) {
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perror("mmap");
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exit(1);
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}
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}
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