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LM92.cpp
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LM92.cpp
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/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software *
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA *
* *
***************************************************************************
* *
* (c) Copyright, 1997-2012, ANSR *
* *
***************************************************************************
* *
* Filename: LM92.cpp *
* *
***************************************************************************/
#include "armlib.h"
/// Reserve memory for the singleton object.
static LM92 lm92SingletonObject;
/**
* Get a pointer to the LM92 object.
*/
LM92 *LM92::GetInstance()
{
return &lm92SingletonObject;
}
/**
* Configure the temperature sensor for operation.
*/
void LM92::Enable()
{
}
/**
* Read the raw LM92 sensor value.
*
* @return raw measurement value
*/
int32_t LM92::ReadRaw()
{
uint8_t data[10];
if (!I2C0::GetInstance()->Start(0x91))
return -999;
I2C0::GetInstance()->Read(data, 2);
I2C0::GetInstance()->Stop();
// Convert from 8-bit binary data to a 32-bit 2's compliment number.
return ((int8_t) (data[0]) << 8) | data[1];
}
/**
* Read the current temperature in degrees F.
*
* @return temperature in units of 0.1 degrees F
*/
int32_t LM92::ReadTempC()
{
int32_t value;
if ((value = ReadRaw()) == -999)
return -999;
// Convert from degC to degF.
// See the LM72_92.xls Spreadsheet in the .../unit_test directory for additional information.
return ((5 * value) / 64);
}
/**
* Read the current temperature in degrees F.
*
* @return temperature in units of 0.1 degrees F
*/
int32_t LM92::ReadTempF()
{
int32_t value;
if ((value = ReadRaw()) == -999)
return -999;
// Convert from raw units to degrees F.
// See the LM72_92.xls Spreadsheet in the .../unit_test directory for additional information.
return ((9 * value) / 64) + 320;
}