Root/bacon/prog/gpio-xburst.h

1/*
2 * gpio-xburst.h - Really primitive XBurst GPIO access
3 *
4 * Written 2010 by Werner Almesberger
5 * Copyright 2010 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 * Ports are numbered 0 = A, 1 = B, ...
15 */
16
17
18#ifndef GPIO_XBURST_H
19#define GPIO_XBURST_H
20
21
22#include <stdint.h>
23
24
25volatile void *mem;
26
27
28#define REG(off) (*(volatile uint32_t *) (mem+(off)))
29
30#define port_pin(port) REG(port*0x100)
31#define port_dats(port) REG(port*0x100+0x14)
32#define port_datc(port) REG(port*0x100+0x18)
33#define port_func(port) REG(port*0x100+0x48)
34#define port_dirs(port) REG(port*0x100+0x64)
35#define port_dirc(port) REG(port*0x100+0x68)
36
37
38static inline void gpio_high(unsigned port, unsigned bit)
39{
40    port_dats(port) = 1 << bit;
41}
42
43
44static inline void gpio_low(unsigned port, unsigned bit)
45{
46    port_datc(port) = 1 << bit;
47}
48
49
50static inline void gpio_set(unsigned port, unsigned bit, int value)
51{
52    if (value)
53        gpio_high(port, bit);
54    else
55        gpio_low(port, bit);
56}
57
58
59static inline int gpio_get(unsigned port, unsigned bit)
60{
61    return (port_pin(port) >> bit) & 1;
62}
63
64
65static inline void gpio_output(unsigned port, unsigned bit)
66{
67    port_dirs(port) = 1 << bit;
68}
69
70
71static inline void gpio_input(unsigned port, unsigned bit)
72{
73    port_dirc(port) = 1 << bit;
74}
75
76
77void gpio_init(void);
78
79
80#endif /* !GPIO_XBURST_H */
81

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