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73 lines
2.0 KiB
73 lines
2.0 KiB
/* |
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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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