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149 lines
5.0 KiB
Objective-C
149 lines
5.0 KiB
Objective-C
// ---------------------------------------------------------------------------
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// Created by Francisco Malpartida on 20/08/11.
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// Copyright 2011 - Under creative commons license 3.0:
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// Attribution-ShareAlike CC BY-SA
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//
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// This software is furnished "as is", without technical support, and with no
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// warranty, express or implied, as to its usefulness for any purpose.
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//
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// Thread Safe: No
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// Extendable: Yes
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//
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// @file SI2CIO.h
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// This file implements a basic IO library using the PCF8574 I2C IO Expander
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// chip, but using software I2C.
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//
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// @brief
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// Implement a basic IO library to drive the PCF8574* I2C IO Expander ASIC.
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// The library implements basic IO general methods to configure IO pin direction
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// read and write uint8_t operations and basic pin level routines to set or read
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// a particular IO port.
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//
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// @version API 1.0.0
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//
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// @author F. Malpartida - fmalpartida@gmail.com
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// Adapted to SoftIC2 by Adrian Piccioli - adrianpiccioli@gmail.com
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// ---------------------------------------------------------------------------
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#ifndef _SI2CIO_H_
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#define _SI2CIO_H_
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#include <inttypes.h>
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#define _SI2CIO_VERSION "1.0.0"
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/*!
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@class
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@abstract SI2CIO
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@discussion Library driver to control PCF8574 based ASICs. Implementing
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library calls to set/get port through I2C bus.
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*/
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class SI2CIO
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{
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public:
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/*!
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@method
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@abstract Constructor method
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@discussion Class constructor constructor.
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*/
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SI2CIO ( );
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/*!
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@method
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@abstract Initializes the device.
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@discussion This method initializes the device allocating an I2C address.
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This method is the first method that should be call prior to calling any
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other method form this class. On initialization all pins are configured
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as INPUT on the device.
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@param i2cAddr: I2C Address where the device is located.
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@result 1 if the device was initialized correctly, 0 otherwise
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*/
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int begin ( uint8_t i2cAddr );
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/*!
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@method
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@abstract Sets the mode of a particular pin.
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@discussion Sets the mode of a particular pin to INPUT, OUTPUT. digitalWrite
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has no effect on pins which are not declared as output.
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@param pin[in] Pin from the I2C IO expander to be configured. Range 0..7
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@param dir[in] Pin direction (INPUT, OUTPUT).
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*/
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void pinMode ( uint8_t pin, uint8_t dir );
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/*!
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@method
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@abstract Sets all the pins of the device in a particular direction.
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@discussion This method sets all the pins of the device in a particular
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direction. This method is useful to set all the pins of the device to be
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either inputs or outputs.
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@param dir[in] Direction of all the pins of the device (INPUT, OUTPUT).
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*/
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void portMode ( uint8_t dir );
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/*!
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@method
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@abstract Reads all the pins of the device that are configured as INPUT.
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@discussion Reads from the device the status of the pins that are configured
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as INPUT. During initialization all pins are configured as INPUTs by default.
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Please refer to pinMode or portMode.
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@param none
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*/
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uint8_t read ( void );
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/*!
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@method
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@abstract Read a pin from the device.
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@discussion Reads a particular pin from the device. To read a particular
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pin it has to be configured as INPUT. During initialization all pins are
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configured as INPUTs by default. Please refer to pinMode or portMode.
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@param pin[in] Pin from the port to read its status. Range (0..7)
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@result Returns the pin status (HIGH, LOW) if the pin is configured
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as an output, reading its value will always return LOW regardless of its
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real state.
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*/
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uint8_t digitalRead ( uint8_t pin );
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/*!
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@method
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@abstract Write a value to the device.
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@discussion Writes to a set of pins in the device. The value is the binary
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representation of all the pins in device. The value written is masked with
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the configuration of the direction of the pins; to change the state of
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a particular pin with this method, such pin has to be configured as OUTPUT
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using the portMode or pinMode methods. If no pins have been configured as
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OUTPUTs this method will have no effect.
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@param value[in] value to be written to the device.
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@result 1 on success, 0 otherwise
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*/
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int write ( uint8_t value );
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/*!
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@method
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@abstract Writes a digital level to a particular pin.
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@discussion Write a level to the indicated pin of the device. For this
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method to have effect, the pin has to be configured as OUTPUT using the
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pinMode or portMode methods.
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@param pin[in] device pin to change level. Range (0..7).
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@para level[in] logic level to set the pin at (HIGH, LOW).
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@result 1 on success, 0 otherwise.
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*/
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int digitalWrite ( uint8_t pin, uint8_t level );
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private:
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uint8_t _shadow; // Shadow output
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uint8_t _dirMask; // Direction mask
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uint8_t _i2cAddr; // I2C address
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bool _initialised; // Initialised object
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};
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#endif |