Robotics platform

Robotics platform 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	void *
18	jz_mmap (off_t address)
19	{
20	int fd;
21
22	void *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 = (void *) mmap (0, getpagesize (), PROT_READ \| PROT_WRITE, MAP_SHARED, fd, address);
31
32	if (pio == (void *) -1)
33	{
34	fprintf (stderr, "Cannot mmap.\n");
35	return 0;
36	}
37
38	return pio;
39	}
40
41	void *
42	jz_fpga_map (off_t address)
43	{
44	int fd;
45
46	void *fpga;
47
48	if ((fd = open ("/dev/mem", O_RDWR \| O_SYNC)) == -1)
49	{
50	fprintf (stderr, "Cannot open /dev/mem.\n");
51	return 0;
52	}
53
54	fpga = (void *) mmap (0, FPGA_SIZE, PROT_READ \| PROT_WRITE, MAP_SHARED, fd, address);
55
56	if (fpga == (void *) -1)
57	{
58	fprintf (stderr, "Cannot mmap.\n");
59	return 0;
60	}
61
62	return fpga;
63	}
64
65

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