I2CTempSensor.cpp

00001 #include "I2CTempSensor.h"
00002 
00003 I2CTempSensor::I2CTempSensor( PinName i2c_sda, PinName i2c_scl, char address ) 
00004     : i2c_p( new I2C( i2c_sda, i2c_scl ) ), i2c( *i2c_p ), adr( address )
00005 {
00006     init();
00007 }
00008 
00009 I2CTempSensor::I2CTempSensor( I2C &i2c_obj, char address )
00010     : i2c_p( NULL ), i2c( i2c_obj ), adr( address )
00011 {
00012     init();
00013 }
00014 
00015 I2CTempSensor::~I2CTempSensor()
00016 {
00017     if ( NULL != i2c_p )
00018         delete  i2c_p;
00019 }
00020 
00021 void I2CTempSensor::init( void )
00022 {
00023     char    command[ 2 ];
00024 
00025     command[ 0 ]    = LM75B_Conf;
00026     command[ 1 ]    = 0x00;
00027 
00028     i2c.write( adr, command, 2 );
00029 }
00030 
00031 short I2CTempSensor::read16( void )
00032 {
00033     char    command[ 2 ];
00034 
00035     command[ 0 ]    = LM75B_Temp;
00036 
00037     i2c.write( adr, command, 1 );  // Send command string
00038     i2c.read(  adr, command, 2 );  // read two bytes data
00039 
00040     return ( (command[ 0 ] << 8)| command[1] );
00041 }