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f32xbase/f32x/gpio-xburst.c
Werner Almesberger bb600dada5 f32x: added support for the c2ben adapter
- f32x/c2-ben.c: bitbang wrapper for the c2ben board
- f32x/Makefile: added "ben" target
- f32x/gpio-xburst.h, f32x/gpio-xburst.c: GPIO access primitives for XBurst
  CPUs
2010-10-21 20:15:07 -03:00

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C

/*
* f32x/gpio-xburst.c - Really primitive XBurst GPIO access
*
* Written 2010 by Werner Almesberger
* Copyright 2010 Werner Almesberger
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/mman.h>
#include "gpio-xburst.h"
#define BASE 0x10010000
volatile void *mem;
void gpio_init(void)
{
int fd;
fd = open("/dev/mem", O_RDWR);
if (fd < 0) {
perror("/dev/mem");
exit(1);
}
mem = mmap(NULL, 0x1000, PROT_READ | PROT_WRITE, MAP_SHARED, fd, BASE);
if (mem == MAP_FAILED) {
perror("mmap");
exit(1);
}
}