PCAL9555.cpp

00001 #include    "mbed.h"
00002 #include    "PCAL9555.h"
00003 
00004 
00005 PCAL9555::PCAL9555( PinName i2c_sda, PinName i2c_scl, char i2c_address )
00006     : PCAL955x( i2c_sda, i2c_scl, i2c_address ), n_of_pins( 16 )
00007 {
00008 }
00009 
00010 PCAL9555::PCAL9555( I2C &i2c_obj, char i2c_address )
00011     : PCAL955x( i2c_obj, i2c_address ), n_of_pins( 16 )
00012 {
00013 }
00014 
00015 PCAL9555::~PCAL9555()
00016 {
00017 }
00018 
00019 int PCAL9555::number_of_pins( void )
00020 {
00021     return ( n_of_pins );
00022 }
00023 
00024 void PCAL9555::reg_index_write( char reg_index, int data )
00025 {
00026     char    a[ 3 ];
00027 
00028     a[ 0 ]  = regmap[ reg_index ];
00029     a[ 1 ]  = data;
00030     a[ 2 ]  = data >> 8;
00031 
00032     bus_write( a, sizeof( a ) );
00033 }
00034 
00035 int PCAL9555::reg_index_read( char reg_index )
00036 {
00037     char    a[ 2 ];
00038 
00039     bus_read( regmap[ reg_index ], a, sizeof( a ) );
00040 
00041     return ( ((int)(a[ 1 ]) << 8) | a[ 0 ] );
00042 }
00043 
00044 PCAL9555& PCAL9555::operator= ( int bit_pattern )
00045 {
00046     write( bit_pattern );
00047     return ( *this );
00048 }
00049 
00050 PCAL9555& PCAL9555::operator= ( PCAL9555& rhs )
00051 {
00052     write( rhs.read() );
00053     return *this;
00054 }
00055 
00056 const char PCAL9555::regmap[]   = {
00057     InputPort,
00058     OutoutPort,
00059     PolarityInversionPort,
00060     ConfigurationPort,
00061     OutputDriveStrength0,
00062     OutputDriveStrength1,
00063     InputLatch,
00064     PullUpPullDowmEnable,
00065     PullUpPullDowmSelection,
00066     InterruptMask,
00067     InterruptStatus,
00068     OutputPortConfiguration
00069 };