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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
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