![](/media/cache/profiles/IMG-20180530-WA0009_4.jpg.50x50_q85.jpg)
This chip is a port expansor, thal "speak" to master through I2C communication.
Fork of PCF8574 by
PCF8574.h
00001 /* mbed PCF8574 Library, for driving the I2C I/O Expander 00002 * Copyright (c) 2008-2010, cstyles, sford 00003 * 00004 * Permission is hereby granted, free of charge, to any person obtaining a copy 00005 * of this software and associated documentation files (the "Software"), to deal 00006 * in the Software without restriction, including without limitation the rights 00007 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 00008 * copies of the Software, and to permit persons to whom the Software is 00009 * furnished to do so, subject to the following conditions: 00010 * 00011 * The above copyright notice and this permission notice shall be included in 00012 * all copies or substantial portions of the Software. 00013 * 00014 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 00015 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 00016 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 00017 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 00018 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 00019 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 00020 * THE SOFTWARE. 00021 */ 00022 00023 #include "mbed.h" 00024 00025 #ifndef MBED_PCF8574_H 00026 #define MBED_PCF8574_H 00027 00028 /** Interface to the popular PCF8574 I2C 8 Bit IO expander */ 00029 class PCF8574 { 00030 public: 00031 /** Create an instance of the PCF8574 connected to specfied I2C pins, with the specified address. 00032 * 00033 * @param sda The I2C data pin 00034 * @param scl The I2C clock pin 00035 * @param address The I2C address for this PCF8574 00036 */ 00037 PCF8574(PinName sda, PinName scl, int address); 00038 00039 /** Read the IO pin level 00040 * 00041 * @return The byte read 00042 */ 00043 int read(); 00044 00045 /** Write to the IO pins 00046 * 00047 * @param data The 8 bits to write to the IO port 00048 */ 00049 void write(int data); 00050 00051 private: 00052 I2C _i2c; 00053 int _address; 00054 }; 00055 00056 #endif
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