76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
/*
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* mcp23s17.h
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*
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* Created on: Nov 25, 2011
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* Author: Doug
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*
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* Copyright (C) 2011-2023 Doug Brown
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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#ifndef DRIVERS_MCP23S17_H_
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#define DRIVERS_MCP23S17_H_
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#include "../hal/spi.h"
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/// A few register defines. Ordinarily I wouldn't put these in the header file
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/// because users of this module shouldn't care...but I have had to do some
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/// optimizations with the AVR to bypass the hardware abstraction layer.
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#define MCP23S17_CONTROL_WRITE(address) (0x40 | (address << 1))
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#define MCP23S17_CONTROL_READ(address) (0x40 | (address << 1) | 1)
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#define MCP23S17_IODIRA 0x00
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#define MCP23S17_IODIRB 0x01
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#define MCP23S17_IPOLA 0x02
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#define MCP23S17_IPOLB 0x03
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#define MCP23S17_GPINTENA 0x04
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#define MCP23S17_GPINTENB 0x05
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#define MCP23S17_DEFVALA 0x06
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#define MCP23S17_DEFVALB 0x07
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#define MCP23S17_INTCONA 0x08
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#define MCP23S17_INTCONB 0x09
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#define MCP23S17_IOCON 0x0A
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#define MCP23S17_IOCON_AGAIN 0x0B
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#define MCP23S17_GPPUA 0x0C
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#define MCP23S17_GPPUB 0x0D
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#define MCP23S17_INTFA 0x0E
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#define MCP23S17_INTFB 0x0F
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#define MCP23S17_INTCAPA 0x10
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#define MCP23S17_INTCAPB 0x11
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#define MCP23S17_GPIOA 0x12
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#define MCP23S17_GPIOB 0x13
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#define MCP23S17_OLATA 0x14
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#define MCP23S17_OLATB 0x15
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/// Struct representing a single MCP23S17 device
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typedef struct MCP23S17
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{
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/// The SPI device representing this MCP23S17
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SPIDevice spi;
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} MCP23S17;
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void MCP23S17_Init(MCP23S17 *mcp, GPIOPin resetPin);
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void MCP23S17_Begin(MCP23S17 *mcp);
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void MCP23S17_End(MCP23S17 *mcp);
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void MCP23S17_SetDDR(MCP23S17 *mcp, uint16_t ddr);
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uint16_t MCP23S17_DDR(MCP23S17 *mcp);
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void MCP23S17_SetOutputs(MCP23S17 *mcp, uint16_t data);
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uint16_t MCP23S17_Outputs(MCP23S17 *mcp);
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uint16_t MCP23S17_ReadInputs(MCP23S17 *mcp);
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void MCP23S17_SetPullups(MCP23S17 *mcp, uint16_t pullups);
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uint16_t MCP23S17_Pullups(MCP23S17 *mcp);
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#endif /* DRIVERS_MCP23S17_H_ */
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