This chip is a port expansor, thal "speak" to master through I2C communication.
Fork of PCF8574 by
Diff: PCF8574.cpp
- Revision:
- 0:ab4e14b911ee
- Child:
- 1:ec8da0c59403
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/PCF8574.cpp Thu Jun 03 12:56:21 2010 +0000 @@ -0,0 +1,41 @@ +/* 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 "PCF8574.h" +#include "mbed.h" + +PCF8574::PCF8574(PinName sda, PinName scl, int address) + : _i2c(sda, scl) { + _address = address; +} + +int PCF8574::read() { + char foo[1]; + _i2c.read(_addr, foo, 1); + return foo[0]; +} + +void PCF8574::write(int data) { + char foo[1]; + foo[0] = data; + _i2c.write(_addr, foo, 1); +}