PCF8591.cpp

00001 //**********************
00002 // PCF8591.cpp for mbed
00003 //
00004 // PCF8591 lcd(P0_5,P0_4);
00005 // or
00006 // I2C i2c(P0_5,P0_4);
00007 // PCF8591 lcd(i2c);
00008 //
00009 // (C)Copyright 2014 All rights reserved by Y.Onodera
00010 // http://einstlab.web.fc2.com
00011 //**********************
00012 
00013 #include "mbed.h"
00014 #include "PCF8591.h"
00015 
00016 PCF8591::PCF8591 (PinName sda, PinName scl) : _i2c(sda, scl) {
00017 }
00018 PCF8591::PCF8591 (I2C& p_i2c) : _i2c(p_i2c) {
00019 }
00020 
00021 void PCF8591::put(unsigned char a, unsigned char b)
00022 {
00023     buf[0]=a;
00024     buf[1]=b;
00025     _i2c.write(PCF8591_ADDR, buf, 2);
00026 }
00027 
00028 unsigned char PCF8591::get(unsigned char a)
00029 {
00030     buf[0] = a;
00031     _i2c.write(PCF8591_ADDR, buf, 1, true); // no stop, repeated
00032     _i2c.read( PCF8591_ADDR, buf, 1);
00033     return buf[0];
00034 }
00035 
00036