1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/* Copyright 2018 Mike Roberts
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#define EXPANDER_ADDR 0x27
#define I2C_TIMEOUT 200 // milliseconds
#define EXPANDER_PAUSE 0 // microseconds
enum EXPANDER_REGISTERS {
EXPANDER_REG_IODIRA = 0x00,
EXPANDER_REG_IODIRB = 0x01,
EXPANDER_REG_IPOLA = 0x02,
EXPANDER_REG_IPOLB = 0x03,
EXPANDER_REG_GPINTENA = 0x04,
EXPANDER_REG_GPINTENB = 0x05,
EXPANDER_REG_DEFVALA = 0x06,
EXPANDER_REG_DEFVALB = 0x07,
EXPANDER_REG_INTCONA = 0x08,
EXPANDER_REG_INTCONB = 0x09,
EXPANDER_REG_IOCONA = 0x0A,
EXPANDER_REG_IOCONB = 0x0B,
EXPANDER_REG_GPPUA = 0x0C,
EXPANDER_REG_GPPUB = 0x0D,
EXPANDER_REG_INTFA = 0x0E,
EXPANDER_REG_INTFB = 0x0F,
EXPANDER_REG_INTCAPA = 0x10,
EXPANDER_REG_INTCAPB = 0x11,
EXPANDER_REG_GPIOA = 0x12,
EXPANDER_REG_GPIOB = 0x13,
EXPANDER_REG_OLATA = 0x14,
EXPANDER_REG_OLATB = 0x15
};
#define GPA0 0x0
#define GPA1 0x1
#define GPA2 0x2
#define GPA3 0x3
#define GPA4 0x4
#define GPA5 0x5
#define GPA6 0x6
#define GPA7 0x7
#define GPB0 0x8
#define GPB1 0x9
#define GPB2 0xA
#define GPB3 0xB
#define GPB4 0xC
#define GPB5 0xD
#define GPB6 0xE
#define GPB7 0xF
void expander_init(void);
void expander_select(uint8_t pin);
void expander_unselect(uint8_t pin);
void expander_unselect_all(void);
|
