74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
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/*
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* mcp23x17:
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* Copyright (c) 2012-2013 Gordon Henderson
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*
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* Header file for code using the MCP23x17 GPIO expander chip.
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* This comes in 2 flavours: MCP23017 which has an I2C interface,
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* an the MXP23S17 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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// MCP23x17 Registers
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#define IODIRA 0x00
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#define IPOLA 0x02
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#define GPINTENA 0x04
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#define DEFVALA 0x06
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#define INTCONA 0x08
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#define IOCON 0x0A
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#define GPPUA 0x0C
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#define INTFA 0x0E
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#define INTCAPA 0x10
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#define GPIOA 0x12
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#define OLATA 0x14
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#define IODIRB 0x01
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#define IPOLB 0x03
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#define GPINTENB 0x05
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#define DEFVALB 0x07
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#define INTCONB 0x09
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#define IOCONB 0x0B
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#define GPPUB 0x0D
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#define INTFB 0x0F
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#define INTCAPB 0x11
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#define GPIOB 0x13
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#define 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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