3 * Copyright (c) 2012-2013 Gordon Henderson
5 * Header file for code using the MCP23x08 and 17 GPIO expander
7 * This comes in 2 flavours: MCP230xx (08/17) which has an I2C
8 * interface, and the MXP23Sxx (08/17) which has an SPI interface.
9 ***********************************************************************
10 * This file is part of wiringPi:
11 * https://projects.drogon.net/raspberry-pi/wiringpi/
13 * wiringPi is free software: you can redistribute it and/or modify
14 * it under the terms of the GNU Lesser General Public License as
15 * published by the Free Software Foundation, either version 3 of the
16 * License, or (at your option) any later version.
18 * wiringPi is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU Lesser General Public License for more details.
23 * You should have received a copy of the GNU Lesser General Public
24 * License along with wiringPi.
25 * If not, see <http://www.gnu.org/licenses/>.
26 ***********************************************************************
31 #define MCP23x08_IODIR 0x00
32 #define MCP23x08_IPOL 0x01
33 #define MCP23x08_GPINTEN 0x02
34 #define MCP23x08_DEFVAL 0x03
35 #define MCP23x08_INTCON 0x04
36 #define MCP23x08_IOCON 0x05
37 #define MCP23x08_GPPU 0x06
38 #define MCP23x08_INTF 0x07
39 #define MCP23x08_INTCAP 0x08
40 #define MCP23x08_GPIO 0x09
41 #define MCP23x08_OLAT 0x0A
45 #define MCP23x17_IODIRA 0x00
46 #define MCP23x17_IPOLA 0x02
47 #define MCP23x17_GPINTENA 0x04
48 #define MCP23x17_DEFVALA 0x06
49 #define MCP23x17_INTCONA 0x08
50 #define MCP23x17_IOCON 0x0A
51 #define MCP23x17_GPPUA 0x0C
52 #define MCP23x17_INTFA 0x0E
53 #define MCP23x17_INTCAPA 0x10
54 #define MCP23x17_GPIOA 0x12
55 #define MCP23x17_OLATA 0x14
57 #define MCP23x17_IODIRB 0x01
58 #define MCP23x17_IPOLB 0x03
59 #define MCP23x17_GPINTENB 0x05
60 #define MCP23x17_DEFVALB 0x07
61 #define MCP23x17_INTCONB 0x09
62 #define MCP23x17_IOCONB 0x0B
63 #define MCP23x17_GPPUB 0x0D
64 #define MCP23x17_INTFB 0x0F
65 #define MCP23x17_INTCAPB 0x11
66 #define MCP23x17_GPIOB 0x13
67 #define MCP23x17_OLATB 0x15
69 // Bits in the IOCON register
71 #define IOCON_UNUSED 0x01
72 #define IOCON_INTPOL 0x02
73 #define IOCON_ODR 0x04
74 #define IOCON_HAEN 0x08
75 #define IOCON_DISSLW 0x10
76 #define IOCON_SEQOP 0x20
77 #define IOCON_MIRROR 0x40
78 #define IOCON_BANK_MODE 0x80
80 // Default initialisation mode
82 #define IOCON_INIT (IOCON_SEQOP)
86 #define CMD_WRITE 0x40