PCA9672.cpp

00001 /* mbed PCA9672 I2C I/O Expander Library
00002  * Copyright (c) 2013 viswesr
00003  *
00004  * MIT License
00005  *
00006  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
00007  * and associated documentation files (the "Software"), to deal in the Software without restriction,
00008  * including without limitation the rights to use, copy, modify, merge, publish, distribute,
00009  * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
00010  * furnished to do so, subject to the following conditions:
00011  *
00012  * The above copyright notice and this permission notice shall be included in all copies or
00013  * substantial portions of the Software.
00014  *
00015  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
00016  * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00017  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
00018  * DAMAGES OR OTHER 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 THE SOFTWARE.
00020  */
00021 
00022 #include "PCA9672.h"
00023 
00024 PCA9672::PCA9672 (PinName sda, PinName scl) : _i2c(sda, scl)
00025 {
00026     // Software Reset
00027     _i2c.start();
00028     while(_i2c.write(0x00) !=1);
00029     while(_i2c.write(0x06) !=1);
00030     _i2c.stop();
00031 
00032     /* Software reset is not required. But, gives an 
00033        indication if the selected I2C bus frequency works */
00034 }
00035 
00036 void PCA9672::frequency (int hz)
00037 {
00038     _i2c.frequency(hz);
00039 }
00040 
00041 void PCA9672::write (char value)
00042 {
00043     _i2c.write(PCA9672_ADDR, &value, 1);
00044 }
00045 
00046 int PCA9672::read (void)
00047 {
00048     _i2c.read(PCA9672_ADDR | 0x01);
00049 }
00050 
00051 PCA9672::~PCA9672 ()
00052 {
00053 
00054 }