PCF8574 I2C IO Expander Interface
Dependents: PCF8574_HelloWorld PCF8574_I2C_4x4_Keypad PCF8574_I2C_4x4_Keypad_interface PCF8574_ButtonPress
PCF8574.h
- Committer:
- simon
- Date:
- 2010-06-03
- Revision:
- 1:ec8da0c59403
- Parent:
- 0:ab4e14b911ee
File content as of revision 1:ec8da0c59403:
/* mbed PCF8574 Library, for driving the I2C I/O Expander * Copyright (c) 2008-2010, cstyles, sford * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "mbed.h" #ifndef MBED_PCF8574_H #define MBED_PCF8574_H /** Interface to the popular PCF8574 I2C 8 Bit IO expander */ class PCF8574 { public: /** Create an instance of the PCF8574 connected to specfied I2C pins, with the specified address. * * @param sda The I2C data pin * @param scl The I2C clock pin * @param address The I2C address for this PCF8574 */ PCF8574(PinName sda, PinName scl, int address); /** Read the IO pin level * * @return The byte read */ int read(); /** Write to the IO pins * * @param data The 8 bits to write to the IO port */ void write(int data); private: I2C _i2c; int _address; }; #endif