88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
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/*
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* mcp23xxx:
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* Copyright (c) 2012-2013 Gordon Henderson
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*
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* Header file for code using the MCP23x08 and 17 GPIO expander
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* chips.
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* This comes in 2 flavours: MCP230xx (08/17) which has an I2C
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* interface, and the MXP23Sxx (08/17) which has an SPI interface.
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***********************************************************************
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* This file is part of wiringPi:
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* https://projects.drogon.net/raspberry-pi/wiringpi/
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*
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* wiringPi is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* wiringPi is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with wiringPi.
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* If not, see <http://www.gnu.org/licenses/>.
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***********************************************************************
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*/
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// MCP23x08 Registers
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#define MCP23x08_IODIR 0x00
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#define MCP23x08_IPOL 0x01
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#define MCP23x08_GPINTEN 0x02
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#define MCP23x08_DEFVAL 0x03
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#define MCP23x08_INTCON 0x04
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#define MCP23x08_IOCON 0x05
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#define MCP23x08_GPPU 0x06
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#define MCP23x08_INTF 0x07
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#define MCP23x08_INTCAP 0x08
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#define MCP23x08_GPIO 0x09
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#define MCP23x08_OLAT 0x0A
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// MCP23x17 Registers
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#define MCP23x17_IODIRA 0x00
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#define MCP23x17_IPOLA 0x02
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#define MCP23x17_GPINTENA 0x04
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#define MCP23x17_DEFVALA 0x06
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#define MCP23x17_INTCONA 0x08
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#define MCP23x17_IOCON 0x0A
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#define MCP23x17_GPPUA 0x0C
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#define MCP23x17_INTFA 0x0E
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#define MCP23x17_INTCAPA 0x10
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#define MCP23x17_GPIOA 0x12
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#define MCP23x17_OLATA 0x14
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#define MCP23x17_IODIRB 0x01
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#define MCP23x17_IPOLB 0x03
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#define MCP23x17_GPINTENB 0x05
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#define MCP23x17_DEFVALB 0x07
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#define MCP23x17_INTCONB 0x09
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#define MCP23x17_IOCONB 0x0B
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#define MCP23x17_GPPUB 0x0D
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#define MCP23x17_INTFB 0x0F
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#define MCP23x17_INTCAPB 0x11
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#define MCP23x17_GPIOB 0x13
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#define MCP23x17_OLATB 0x15
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// Bits in the IOCON register
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#define IOCON_UNUSED 0x01
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#define IOCON_INTPOL 0x02
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#define IOCON_ODR 0x04
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#define IOCON_HAEN 0x08
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#define IOCON_DISSLW 0x10
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#define IOCON_SEQOP 0x20
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#define IOCON_MIRROR 0x40
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#define IOCON_BANK_MODE 0x80
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// Default initialisation mode
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#define IOCON_INIT (IOCON_SEQOP)
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// SPI Command codes
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#define CMD_WRITE 0x40
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#define CMD_READ 0x41
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