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htu21d: update to correct code now under MIT license

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Signed-off-by: William Penner <william.penner@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
William Penner
2014-11-25 20:34:35 +00:00
committed by Brendan Le Foll
parent b53881a8d6
commit ce928907eb
3 changed files with 203 additions and 190 deletions
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220
src/htu21d/htu21d.cpp
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@ -2,23 +2,23 @@
* Author: William Penner <william.penner@intel.com>
* Copyright (c) 2014 Intel Corporation.
*
* This driver supports the HTU21D digital humidity and temperature
* sensor. The datasheet is available from:
* http://www.meas-spec.com/downloads/HTU21D.pdf
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* 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.
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <iostream>
@ -44,32 +44,38 @@ HTU21D::HTU21D(int bus, int devAddr) {
if (ret != MRAA_SUCCESS) {
fprintf(stderr, "Error accessing i2c bus\n");
}
resetSensor();
}
HTU21D::~HTU21D() {
mraa_i2c_stop(m_i2ControlCtx);
}
int32_t
HTU21D::htu21_temp_ticks_to_millicelsius(int ticks)
int
HTU21D::resetSensor(void)
{
ticks &= ~0x0003; /* clear status bits */
/*
* Formula T = -46.85 + 175.72 * ST / 2^16 from datasheet p14,
* optimized for integer fixed point (3 digits) arithmetic
*/
return ((21965 * (int32_t)ticks) >> 13) - 46850;
uint8_t data;
mraa_i2c_address (m_i2ControlCtx, m_controlAddr);
mraa_i2c_write (m_i2ControlCtx, &data, 1);
usleep(20000);
}
/*
* Convert register value to degC * 1000
*/
int32_t
HTU21D::htu21_rh_ticks_to_per_cent_mille(int ticks)
HTU21D::convertTemp(int32_t regval)
{
ticks &= ~0x0003; /* clear status bits */
/*
* Formula RH = -6 + 125 * SRH / 2^16 from datasheet p14,
* optimized for integer fixed point (3 digits) arithmetic
*/
return ((15625 * (int32_t)ticks) >> 13) - 6000;
return ((21965 * (regval & 0xFFFC)) >> 13) - 46850;
}
/*
* Convert register value to %RH * 1000
*/
int32_t
HTU21D::convertRH(int regval)
{
return ((15625 * (regval & 0xFFFC)) >> 13) - 6000;
}
int
@ -77,40 +83,31 @@ HTU21D::sampleData(void)
{
uint32_t itemp;
itemp = i2cReadReg_16(HTU21D_T_MEASUREMENT_HM);
m_temperature = htu21_temp_ticks_to_millicelsius(itemp);
itemp = i2cReadReg_16(HTU21D_READ_TEMP_HOLD);
m_temperature = convertTemp(itemp);
itemp = i2cReadReg_16(HTU21D_RH_MEASUREMENT_HM);
m_humidity = htu21_rh_ticks_to_per_cent_mille(itemp);
itemp = i2cReadReg_16(HTU21D_READ_HUMIDITY_HOLD);
m_humidity = convertRH(itemp);
return 0;
}
int32_t
HTU21D::getTemperature(void)
float
HTU21D::getTemperature(int bSampleData)
{
return m_temperature;
if (bSampleData) {
sampleData();
}
return (float)m_temperature / 1000;
}
int32_t
HTU21D::getHumidity(void)
float
HTU21D::getHumidity(int bSampleData)
{
return m_humidity;
}
/*
* This is the primary function to read the data. It will initiate
* a measurement cycle and will then return both the humidity and
* temperature values. piTemperature can be NULL.
*/
int32_t
HTU21D::getRHumidity(int32_t* piTemperature)
{
sampleData();
if (NULL != piTemperature)
*piTemperature = m_temperature;
return m_humidity;
if (bSampleData) {
sampleData();
}
return (float)m_humidity / 1000;
}
/*
@ -119,12 +116,30 @@ HTU21D::getRHumidity(int32_t* piTemperature)
* RHcomp = RHactualT + (25 - Tactual) * CoeffTemp
* RHcomp is in units of %RH * 1000
*/
int32_t
HTU21D::getCompRH(void)
float
HTU21D::getCompRH(int bSampleData)
{
return m_humidity + (25000 - m_temperature) * 3 / 20;
if (bSampleData) {
sampleData();
}
return (float)(m_humidity + (25000 - m_temperature) * 3 / 20) / 1000;
}
int
HTU21D::setHeater(int bEnable)
{
uint8_t userreg;
userreg = i2cReadReg_8(HTU21D_READ_USER_REG);
if (bEnable)
userreg |= HTU21D_HEATER_ENABLE;
else
userreg &= ~HTU21D_HEATER_ENABLE;
if (i2cWriteReg(HTU21D_WRITE_USER_REG, userreg) < 0)
return -1;
return 0;
}
/*
* Test function: when reading the HTU21D many times rapidly should
@ -135,43 +150,50 @@ HTU21D::getCompRH(void)
int
HTU21D::testSensor(void)
{
int i;
int iError = 0;
int i, j;
int32_t iTemp, iHum;
int32_t iTempMax, iTempMin;
int32_t iHumMax, iHumMin;
int32_t iHumFirst, iTempFirst;
float fTemp, fHum;
float fTempMax, fTempMin;
float fHumMax, fHumMin;
float fHumFirst, fTempFirst;
fprintf(stdout, "Executing Sensor Test.\n Reading registers 100 times to look for operation\n" );
fprintf(stdout, "Executing Sensor Test\n" );
iHum = getRHumidity(&iTemp);
iTempFirst = iTempMax = iTempMin = iTemp;
iHumFirst = iHumMax = iHumMin = iHum;
fHum = getHumidity(true);
fTemp = getTemperature(false);
fTempFirst = fTempMax = fTempMin = fTemp;
fHumFirst = fHumMax = fHumMin = fHum;
for (i=0; i < 100; i++) {
iHum = getRHumidity(&iTemp);
if (iHum < iHumMin) iHumMin = iHum;
if (iHum > iHumMax) iHumMax = iHum;
if (iTemp < iTempMin) iTempMin = iTemp;
if (iTemp > iTempMax) iTempMax = iTemp;
// fprintf(stdout, "Temp: %d Humidity: %d\n", iTemp, iHum);
// Turn on the heater to make a sensor change
setHeater(true);
// Then sample the sensor a few times
for (i=0; i < 10; i++) {
fHum = getHumidity(true);
fTemp = getTemperature(false);
if (fHum < fHumMin) fHumMin = fHum;
if (fHum > fHumMax) fHumMax = fHum;
if (fTemp < fTempMin) fTempMin = fTemp;
if (fTemp > fTempMax) fTempMax = fTemp;
usleep(50000);
}
if ((iTemp - iTempFirst) <= 0) {
fprintf(stdout, "! Temperature should have increased, but didn't\n" );
// Turn off the heater
setHeater(false);
// Now check the results
if ((fTemp - fTempFirst) <= 0) {
fprintf(stdout, " Temperature should have increased, but didn't\n" );
iError++;
}
if (iHumMin == iHumMax) {
fprintf(stdout, "! Humidity was unchanged - not working?\n" );
if (fHumMin == fHumMax) {
fprintf(stdout, " Humidity reading was unchanged - warning\n" );
iError++;
}
if (iTempMin == iTempMax) {
fprintf(stdout, "! Temperature was unchanged - not working?\n" );
if (fTempMin == fTempMax) {
fprintf(stdout, " Temperature reading was unchanged - warning\n" );
iError++;
}
if (iError == 0) {
fprintf(stdout, " Device appears functional\n" );
}
@ -185,42 +207,17 @@ HTU21D::testSensor(void)
* Functions to read and write data to the i2c device
*/
mraa_result_t
HTU21D::i2cReadRegValue(int reg, uint32_t* puint32, int ibytes) {
uint32_t data = 0;
if (ibytes > 4)
ibytes = 4;
mraa_i2c_address(m_i2ControlCtx, m_controlAddr);
mraa_i2c_write_byte(m_i2ControlCtx, reg);
mraa_i2c_address(m_i2ControlCtx, m_controlAddr);
mraa_i2c_read(m_i2ControlCtx, (uint8_t *)&data, ibytes);
fprintf(stdout, "reg data = %08x\n", data);
*puint32 = be32toh(data) >> ((4-ibytes) * 8);
fprintf(stdout, "reg return = %08x\n", *puint32);
return MRAA_SUCCESS;
}
mraa_result_t
HTU21D::i2cWriteReg (uint8_t reg, uint8_t value) {
mraa_result_t error = MRAA_SUCCESS;
uint8_t data[2] = { reg, value };
error = mraa_i2c_address (m_i2ControlCtx, m_controlAddr);
mraa_i2c_address (m_i2ControlCtx, m_controlAddr);
error = mraa_i2c_write (m_i2ControlCtx, data, 2);
return error;
}
/*
* Function to read 16 bits starting at reg. This function
* was replaced due to functionality of using read() to
* access i2c data.
*/
uint16_t
HTU21D::i2cReadReg_16 (int reg) {
uint16_t data;
@ -230,11 +227,6 @@ HTU21D::i2cReadReg_16 (int reg) {
return data;
}
/*
* Function to read 8 bits starting at reg. This function
* was replaced due to functionality of using read() to
* access i2c data.
*/
uint8_t
HTU21D::i2cReadReg_8 (int reg) {
mraa_i2c_address(m_i2ControlCtx, m_controlAddr);