Romilly Cocking / MCP23S17

v 0.4

Dependents:   MCP23S17Test MCP23S17_Basic_IO_Demo HelloWorld Lab3-SnakeGame ... more

MCP23S17.h@8:841b19734955, 2010-08-23 (annotated)

Committer:
romilly
Date:
Mon Aug 23 10:57:59 2010 +0000
Revision:
8:841b19734955
Parent:
7:53498e24592c
Child:
9:068b1e8909bb

        

        
Who changed what in which revision?

        

            
                
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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 0.3





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*/





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#include "mbed.h"





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#ifndef  MCP23S17_H





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#define  MCP23S17_H





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#define INTERRUPT_POLARITY_BIT 0x02





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#define INTERRUPT_MIRROR_BIT   0x40





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// all register addresses assume IOCON.BANK = 0 (POR default)





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#define IODIRA   0x00





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#define IODIRB   0x01





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#define GPINTENA 0x04





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#define GPINTENB 0x05





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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 GPIOA    0x12





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#define GPIOB    0x13





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#define OLATA    0x14





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#define OLATB    0x15





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// Control settings





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#define IOCON_BANK  0x80 // Banked registers





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#define IOCON_BYTE_MODE 0x20 // Disables sequential operation. If bank = 0, operations toggle between A and B registers





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#define IOCON_HAEN  0x08 // Hardware address enable





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enum Polarity { ACTIVE_LOW , ACTIVE_HIGH };





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enum Port { PORT_A, PORT_B };





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class MCP23S17 {





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public:





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    MCP23S17(SPI& spi, PinName ncs, char writeOpcode);





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    void direction(Port port, char direction);





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    void interruptEnable(Port port, char interruptsEnabledMask);





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    void interruptPolarity(Polarity polarity);





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    void mirrorInterrupts(bool mirror);





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    void defaultValue(Port port, char valuesToCompare);





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    void interruptControl(Port port, char interruptContolBits);





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    char read(Port port);





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    void write(Port port, char byte);





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protected:





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    SPI& _spi;





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    DigitalOut _ncs;





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    void _init();





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    void _write(Port port, char address, char data);





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    void _write(char address, char data);





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    char _read(Port port, char address);





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    char _read(char address);





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    char _readOpcode;





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    char _writeOpcode;





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};





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#endif