MCP23017.cpp

00001 /* MCP23017 Library for mbed
00002  * Copyright (c) 2014, Takuya Urakawa
00003  * 
00004  * This library is released under the MIT License
00005  * See http://opensource.org/licenses/mit-license.php
00006  */
00007 
00008 #include "MCP23017.h"
00009 
00010 namespace MCP23017 {
00011 
00012 MCP23017::MCP23017(I2C &_i2c, char _addr): 
00013     mI2c(_i2c)
00014 {
00015     mWriteAddr = _addr & 0xFE;
00016     mReadAddr = _addr | 0x01;
00017 }
00018 
00019 void MCP23017::init(void){
00020     
00021     // init config
00022     i2cSend(REG_IOCON, 0);
00023 
00024     // port 0
00025     i2cSend(REG_GPIO, 0, 0);
00026 
00027     // port dirrection all input
00028     i2cSend(REG_IODIR, 0, 0);
00029 
00030     // interupt off
00031     i2cSend(REG_GPINTEN, 0, 0);
00032 
00033     // clear interrupt
00034     read(MCP23017_PORTA);
00035     read(MCP23017_PORTB);
00036 }
00037 
00038 void MCP23017::setConfig(char _value){
00039     
00040     i2cSend(REG_IOCON, _value);
00041 }
00042 
00043 void MCP23017::setDirrection(char _port, char _value){
00044     
00045     i2cSend(REG_IODIR + _port, _value);
00046 }
00047 
00048 void MCP23017::setPullUp(char _port, char _value){
00049     
00050     i2cSend(REG_GPPU + _port, _value);
00051 }
00052 
00053 void MCP23017::setInputPolarity(char _port, char _value){
00054     
00055     i2cSend(REG_IPOL + _port, _value);
00056 }
00057 
00058 
00059 void MCP23017::write(char _port, char _value){
00060     
00061     i2cSend(REG_GPIO + _port, _value);
00062 }
00063 
00064 char MCP23017::read(char _port){
00065     
00066     return i2cRead(REG_GPIO + _port);
00067 }
00068 
00069 //void MCP23017::setInterruptConfig(char _port, char _intcon, char _defval){
00070 //  
00071 //  i2cSend(REG_INTCON + _port, _intcon);
00072 //  i2cSend(REG_DEFVAL + _port, _defval);
00073 
00074 //}
00075 
00076 //void MCP23017::interrupt(char _port, char _value){
00077 
00078 //  i2cSend(REG_GPINTEN + _port, _value);
00079 //  //Read from GPIO to clear interrupt flag
00080 //  read(_port);
00081 //}
00082 
00083 //char MCP23017::readIntcap(char _port){
00084 
00085 //  return i2cRead(REG_INTCAP + _port);
00086 //}
00087 
00088 } // end of namespace
00089