mcp23x0817.h

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/*
 * mcp23xxx:
 *  Copyright (c) 2012-2013 Gordon Henderson
 *
 *  Header file for code using the MCP23x08 and 17 GPIO expander
 *  chips.
 *  This comes in 2 flavours: MCP230xx (08/17) which has an I2C
 *  interface, and the MXP23Sxx (08/17) which has an SPI interface.
 ***********************************************************************
 * This file is part of wiringPi:
 *  https://projects.drogon.net/raspberry-pi/wiringpi/
 *
 *    wiringPi is free software: you can redistribute it and/or modify
 *    it under the terms of the GNU Lesser General Public License as
 *    published by the Free Software Foundation, either version 3 of the
 *    License, or (at your option) any later version.
 *
 *    wiringPi 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 Lesser General Public License for more details.
 *
 *    You should have received a copy of the GNU Lesser General Public
 *    License along with wiringPi.
 *    If not, see <http://www.gnu.org/licenses/>.
 ***********************************************************************
 */

// MCP23x08 Registers
    
#define MCP23x08_IODIR      0x00
#define MCP23x08_IPOL       0x01
#define MCP23x08_GPINTEN    0x02
#define MCP23x08_DEFVAL     0x03
#define MCP23x08_INTCON     0x04
#define MCP23x08_IOCON      0x05
#define MCP23x08_GPPU       0x06
#define MCP23x08_INTF       0x07
#define MCP23x08_INTCAP     0x08
#define MCP23x08_GPIO       0x09
#define MCP23x08_OLAT       0x0A

// MCP23x17 Registers

#define MCP23x17_IODIRA     0x00
#define MCP23x17_IPOLA      0x02
#define MCP23x17_GPINTENA   0x04
#define MCP23x17_DEFVALA    0x06
#define MCP23x17_INTCONA    0x08
#define MCP23x17_IOCON      0x0A
#define MCP23x17_GPPUA      0x0C
#define MCP23x17_INTFA      0x0E
#define MCP23x17_INTCAPA    0x10
#define MCP23x17_GPIOA      0x12
#define MCP23x17_OLATA      0x14

#define MCP23x17_IODIRB     0x01
#define MCP23x17_IPOLB      0x03
#define MCP23x17_GPINTENB   0x05
#define MCP23x17_DEFVALB    0x07
#define MCP23x17_INTCONB    0x09
#define MCP23x17_IOCONB     0x0B
#define MCP23x17_GPPUB      0x0D
#define MCP23x17_INTFB      0x0F
#define MCP23x17_INTCAPB    0x11
#define MCP23x17_GPIOB      0x13
#define MCP23x17_OLATB      0x15

// Bits in the IOCON register

#define IOCON_UNUSED    0x01
#define IOCON_INTPOL    0x02
#define IOCON_ODR   0x04
#define IOCON_HAEN  0x08
#define IOCON_DISSLW    0x10
#define IOCON_SEQOP 0x20
#define IOCON_MIRROR    0x40
#define IOCON_BANK_MODE 0x80

// Default initialisation mode

#define IOCON_INIT  (IOCON_SEQOP)

// SPI Command codes

#define CMD_WRITE   0x40
#define CMD_READ    0x41