Wiljan Arias / MCP23S17

Forked from romilly. Changed the way SPI handler is injected in constructor

Fork of MCP23S17 by Romilly Cocking

MCP23S17.cpp@3:089a2a754567, 2010-08-22 (annotated)

Committer:
romilly
Date:
Sun Aug 22 12:05:06 2010 +0000
Revision:
3:089a2a754567
Parent:
2:6144709f1700
Child:
4:d501c74550a0

        

        
Who changed what in which revision?

        

            
                
UserRevisionLine numberNew contents of line

            
            


romilly

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/* MCP23S17 - drive the Microchip MCP23S17 16-bit Port Extender using SPI





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* Copyright (c) 2010 Romilly Cocking





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* Released under the MIT License: http://mbed.org/license/mit





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*





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* version 0.1





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*/





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#include "mbed.h"





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#include "MCP23S17.h"





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MCP23S17::MCP23S17(SPI& spi, PinName ncs, char writeOpcode) : _spi(spi), _ncs(ncs) {





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    _writeOpcode = writeOpcode;





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    _readOpcode = _writeOpcode | 1; // low order bit = 1 for read





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    _init();





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}





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char MCP23S17::_read(char address) {





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    _ncs = 0;





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    _spi.write(_readOpcode); 





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    _spi.write(address);





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    char result = _spi.write(0);





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    _ncs = 1;





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    return result;





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}





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void MCP23S17::_write(char address, char data) {





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    _ncs = 0;





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    _spi.write(_writeOpcode);





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    _spi.write(address);





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    _spi.write(data);





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    _ncs = 1;





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}





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void MCP23S17::_init() {





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    _write(IOCON, (IOCON_BYTE_MODE | IOCON_HAEN )); // Hardware addressing on, operations toggle between A and B registers





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}





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void MCP23S17::directionA(char direction) {





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     _write(IODIRA, direction); 





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}





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void MCP23S17::directionB(char direction) {





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     _write(IODIRB, direction); 





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}





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 void intconA(char interruptsEnabledMask) {





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    _write(INTCONA, interruptsEnabledMask);





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 }





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void MCP23S17::outputA(char byte) {





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    _write(OLATA, byte); 





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}





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void MCP23S17::outputB(char byte) {





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    _write(OLATB, byte); 





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}





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char MCP23S17::inputA() {





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    return _read(GPIOA);





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}





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char MCP23S17::inputB() {





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    return _read(GPIOB);





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}





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