MCP23017 - Added support for banked registers

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Added support for banked registers

Dependents: Component_Test_Interface FalconWing MX_Spoile_Test Simple_Power_Distribution ... more

MCP23017.h@2:2d4ee919e8a7, 2010-12-20 (annotated)

Committer:: wim
Date:: Mon Dec 20 16:04:04 2010 +0000
Revision:: 2:2d4ee919e8a7
Parent:: 1:e2edbd61f4d0
Child:: 3:72da9cd002bd

Who changed what in which revision?

User	Revision	Line number	New contents of line
wim	0:1a9288cc0630	1	/* MCP23017 - drive the Microchip MCP23017 16-bit Port Extender using I2C
wim	0:1a9288cc0630	2	* Copyright (c) 2010 Wim Huiskamp, Romilly Cocking (original version for SPI)
wim	0:1a9288cc0630	3	*
wim	0:1a9288cc0630	4	* Released under the MIT License: http://mbed.org/license/mit
wim	0:1a9288cc0630	5	*
wim	1:e2edbd61f4d0	6	* version 0.2 Initial Release
wim	1:e2edbd61f4d0	7	* version 0.3 Cleaned up
wim	0:1a9288cc0630	8	*/
wim	0:1a9288cc0630	9	#include "mbed.h"
wim	0:1a9288cc0630	10
wim	0:1a9288cc0630	11	#ifndef MCP23017_H
wim	0:1a9288cc0630	12	#define MCP23017_H
wim	0:1a9288cc0630	13
wim	0:1a9288cc0630	14	// All register addresses assume IOCON.BANK = 0 (POR default)
wim	0:1a9288cc0630	15	#define IODIRA 0x00
wim	0:1a9288cc0630	16	#define IODIRB 0x01
wim	0:1a9288cc0630	17	#define GPINTENA 0x04
wim	0:1a9288cc0630	18	#define GPINTENB 0x05
wim	0:1a9288cc0630	19	#define DEFVALA 0x06
wim	0:1a9288cc0630	20	#define DEFVALB 0x07
wim	0:1a9288cc0630	21	#define INTCONA 0x08
wim	0:1a9288cc0630	22	#define INTCONB 0x09
wim	0:1a9288cc0630	23	#define IOCON 0x0A
wim	0:1a9288cc0630	24	//#define IOCON 0x0B
wim	0:1a9288cc0630	25	#define GPPUA 0x0C
wim	0:1a9288cc0630	26	#define GPPUB 0x0D
wim	0:1a9288cc0630	27	#define INTFA 0x0E
wim	0:1a9288cc0630	28	#define INTFB 0x0F
wim	0:1a9288cc0630	29	#define INTCAPA 0x10
wim	0:1a9288cc0630	30	#define INTCAPB 0x11
wim	0:1a9288cc0630	31	#define GPIOA 0x12
wim	0:1a9288cc0630	32	#define GPIOB 0x13
wim	0:1a9288cc0630	33	#define OLATA 0x14
wim	0:1a9288cc0630	34	#define OLATB 0x15
wim	0:1a9288cc0630	35
wim	0:1a9288cc0630	36	// Control settings
wim	0:1a9288cc0630	37	#define IOCON_BANK 0x80 // Banked registers for Port A and B
wim	0:1a9288cc0630	38	#define IOCON_BYTE_MODE 0x20 // Disables sequential operation, Address Ptr does not increment
wim	0:1a9288cc0630	39	// If Disabled and Bank = 0, operations toggle between Port A and B registers
wim	0:1a9288cc0630	40	#define IOCON_HAEN 0x08 // Hardware address enable
wim	0:1a9288cc0630	41
wim	0:1a9288cc0630	42	#define INTERRUPT_POLARITY_BIT 0x02
wim	0:1a9288cc0630	43	#define INTERRUPT_MIRROR_BIT 0x40
wim	0:1a9288cc0630	44
wim	0:1a9288cc0630	45	#define PORT_DIR_OUT 0x00
wim	0:1a9288cc0630	46	#define PORT_DIR_IN 0xFF
wim	0:1a9288cc0630	47
wim	0:1a9288cc0630	48	enum Polarity { ACTIVE_LOW , ACTIVE_HIGH };
wim	0:1a9288cc0630	49	enum Port { PORT_A, PORT_B };
wim	0:1a9288cc0630	50
wim	0:1a9288cc0630	51	class MCP23017 {
wim	0:1a9288cc0630	52	public:
wim	2:2d4ee919e8a7	53	/** Create an MCP23017 object connected to the specified I2C object and using the specified deviceAddress
wim	2:2d4ee919e8a7	54	*
wim	2:2d4ee919e8a7	55	* @param I2C &i2c the I2C port to connect to
wim	2:2d4ee919e8a7	56	* @param char deviceAddress the address of the MSC23017
wim	2:2d4ee919e8a7	57	*/
wim	0:1a9288cc0630	58	MCP23017(I2C &i2c, char deviceAddress);
wim	2:2d4ee919e8a7	59
wim	2:2d4ee919e8a7	60	/** Set I/O direction of specified MCP23017 Port
wim	2:2d4ee919e8a7	61	*
wim	2:2d4ee919e8a7	62	* @param Port Port address (Port_A or Port_B)
wim	2:2d4ee919e8a7	63	* @param char direction pin direction (0 = output, 1 = input)
wim	2:2d4ee919e8a7	64	*/
wim	0:1a9288cc0630	65	void direction(Port port, char direction);
wim	2:2d4ee919e8a7	66
wim	2:2d4ee919e8a7	67	/** Set Pull-Up Resistors on specified MCP23017 Port
wim	2:2d4ee919e8a7	68	*
wim	2:2d4ee919e8a7	69	* @param Port Port address (Port_A or Port_B)
wim	2:2d4ee919e8a7	70	* @param char offOrOn per pin (0 = off, 1 = on)
wim	2:2d4ee919e8a7	71	*/
wim	0:1a9288cc0630	72	void configurePullUps(Port port, char offOrOn);
wim	2:2d4ee919e8a7	73
wim	0:1a9288cc0630	74	void interruptEnable(Port port, char interruptsEnabledMask);
wim	0:1a9288cc0630	75	void interruptPolarity(Polarity polarity);
wim	0:1a9288cc0630	76	void mirrorInterrupts(bool mirror);
wim	0:1a9288cc0630	77	void defaultValue(Port port, char valuesToCompare);
wim	0:1a9288cc0630	78	void interruptControl(Port port, char interruptControlBits);
wim	2:2d4ee919e8a7	79
wim	2:2d4ee919e8a7	80	/** Read from specified MCP23017 Port
wim	2:2d4ee919e8a7	81	*
wim	2:2d4ee919e8a7	82	* @param Port Port address (Port_A or Port_B)
wim	2:2d4ee919e8a7	83	* @returns data from Port
wim	2:2d4ee919e8a7	84	*/
wim	0:1a9288cc0630	85	char read(Port port);
wim	2:2d4ee919e8a7	86
wim	2:2d4ee919e8a7	87	/** Write to specified MCP23017 Port
wim	2:2d4ee919e8a7	88	*
wim	2:2d4ee919e8a7	89	* @param Port Port address (Port_A or Port_B)
wim	2:2d4ee919e8a7	90	* @param char byte data to write
wim	2:2d4ee919e8a7	91	*/
wim	0:1a9288cc0630	92	void write(Port port, char byte);
wim	1:e2edbd61f4d0	93
wim	0:1a9288cc0630	94	protected:
wim	0:1a9288cc0630	95	I2C &_i2c;
wim	0:1a9288cc0630	96	char _readOpcode;
wim	0:1a9288cc0630	97	char _writeOpcode;
wim	2:2d4ee919e8a7	98
wim	2:2d4ee919e8a7	99	/** Init MCP23017
wim	2:2d4ee919e8a7	100	*
wim	2:2d4ee919e8a7	101	* @param
wim	2:2d4ee919e8a7	102	* @returns
wim	2:2d4ee919e8a7	103	*/
wim	2:2d4ee919e8a7	104	void _init();
wim	2:2d4ee919e8a7	105
wim	2:2d4ee919e8a7	106	/** Write to specified MCP23017 register
wim	2:2d4ee919e8a7	107	*
wim	2:2d4ee919e8a7	108	* @param char address the internal registeraddress of the MSC23017
wim	2:2d4ee919e8a7	109	*/
wim	2:2d4ee919e8a7	110	void _write(char address, char byte);
wim	2:2d4ee919e8a7	111
wim	2:2d4ee919e8a7	112	/** Read from specified MCP23017 register
wim	2:2d4ee919e8a7	113	*
wim	2:2d4ee919e8a7	114	* @param char address the internal registeraddress of the MSC23017
wim	2:2d4ee919e8a7	115	* @returns data from register
wim	2:2d4ee919e8a7	116	*/
wim	2:2d4ee919e8a7	117	char _read(char address);
wim	0:1a9288cc0630	118	};
wim	0:1a9288cc0630	119
wim	0:1a9288cc0630	120	#endif

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Type:	Library
Created:	18 Dec 2010
Imports:	271
Forks:	0
Commits:	6
Dependents:	8
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MCP2317 I2C 16 bit I/O expander

MCP23017.h@2:2d4ee919e8a7, 2010-12-20 (annotated)

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