Hardware Design: SIE

Hardware Design: SIE Git Source Tree

1	/*
2	* JZ47xx GPIO lines
3	*
4	* Written 2010 by Andres Calderon andres.calderon@emqbit.com
5	*/
6
7	#include <stdio.h>
8	#include <sys/mman.h>
9	#include <fcntl.h>
10	#include <stdlib.h>
11	#include <termios.h>
12	#include <unistd.h>
13
14	#include <jz47xx_mmap.h>
15
16
17	unsigned int *
18	jz_mmap (off_t address)
19	{
20	int fd;
21
22	unsigned int *pio;
23
24	if ((fd = open ("/dev/mem", O_RDWR \| O_SYNC)) == -1)
25	{
26	fprintf (stderr, "Cannot open /dev/mem.\n");
27	return 0;
28	}
29
30	pio = (unsigned int *) mmap (0, getpagesize (), PROT_READ \| PROT_WRITE, MAP_SHARED, fd, address);
31
32	if (pio == (unsigned int *) -1)
33	{
34	fprintf (stderr, "Cannot mmap.\n");
35	return 0;
36	}
37
38	return pio;
39	}
40

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