diff options
Diffstat (limited to 'peripheral/libupm/src/htu21d/htu21d.cpp')
| -rw-r--r-- | peripheral/libupm/src/htu21d/htu21d.cpp | 236 |
1 files changed, 0 insertions, 236 deletions
diff --git a/peripheral/libupm/src/htu21d/htu21d.cpp b/peripheral/libupm/src/htu21d/htu21d.cpp deleted file mode 100644 index 0ff097c..0000000 --- a/peripheral/libupm/src/htu21d/htu21d.cpp +++ /dev/null @@ -1,236 +0,0 @@ -/* - * Author: William Penner <william.penner@intel.com> - * Copyright (c) 2014 Intel Corporation. - * - * 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: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * 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> -#include <string> -#include <stdexcept> - -#include <unistd.h> -#include <stdlib.h> - -#include "htu21d.h" - -using namespace upm; - -HTU21D::HTU21D(int bus, int devAddr) : m_i2ControlCtx(bus) { - m_temperature = 0; - m_humidity = 0; - - m_name = HTU21D_NAME; - - m_controlAddr = devAddr; - m_bus = bus; - - mraa::Result ret = m_i2ControlCtx.address(m_controlAddr); - if (ret != mraa::SUCCESS) { - throw std::invalid_argument(std::string(__FUNCTION__) + - ": mraa_i2c_address() failed"); - } - resetSensor(); -} - -void -HTU21D::resetSensor(void) -{ - uint8_t data; - m_i2ControlCtx.address (m_controlAddr); - m_i2ControlCtx.write (&data, 1); - usleep(20000); -} - -/* - * Convert register value to degC * 1000 - */ -int32_t -HTU21D::convertTemp(int32_t regval) -{ - 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 -HTU21D::sampleData(void) -{ - uint32_t itemp; - - itemp = i2cReadReg_16(HTU21D_READ_TEMP_HOLD); - m_temperature = convertTemp(itemp); - - itemp = i2cReadReg_16(HTU21D_READ_HUMIDITY_HOLD); - m_humidity = convertRH(itemp); - - return 0; -} - -float -HTU21D::getTemperature(int bSampleData) -{ - if (bSampleData) { - sampleData(); - } - return (float)m_temperature / 1000; -} - -float -HTU21D::getHumidity(int bSampleData) -{ - if (bSampleData) { - sampleData(); - } - return (float)m_humidity / 1000; -} - -/* - * Use the compensation equation from the datasheet to correct the - * current reading - * RHcomp = RHactualT + (25 - Tactual) * CoeffTemp - * RHcomp is in units of %RH * 1000 - */ -float -HTU21D::getCompRH(int bSampleData) -{ - 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 - * result in a temperature increase. This test will verify that the - * value is changing from read to read - */ - -int -HTU21D::testSensor(void) -{ - int i; - int iError = 0; - float fTemp, fHum; - float fTempMax, fTempMin; - float fHumMax, fHumMin; - float fHumFirst, fTempFirst; - - fprintf(stdout, "Executing Sensor Test\n" ); - - fHum = getHumidity(true); - fTemp = getTemperature(false); - fTempFirst = fTempMax = fTempMin = fTemp; - fHumFirst = fHumMax = fHumMin = fHum; - - // 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); - } - - // 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 (fHumMin == fHumMax) { - fprintf(stdout, " Humidity reading was unchanged - warning\n" ); - iError++; - } - if (fTempMin == fTempMax) { - fprintf(stdout, " Temperature reading was unchanged - warning\n" ); - iError++; - } - if (iError == 0) { - fprintf(stdout, " Device appears functional\n" ); - } - - fprintf(stdout, " Test complete\n" ); - - return iError; -} - -/* - * Functions to read and write data to the i2c device - */ - -mraa::Result -HTU21D::i2cWriteReg (uint8_t reg, uint8_t value) { - mraa::Result error = mraa::SUCCESS; - - uint8_t data[2] = { reg, value }; - m_i2ControlCtx.address (m_controlAddr); - error = m_i2ControlCtx.write (data, 2); - if ( error != mraa::SUCCESS) - throw std::invalid_argument(std::string(__FUNCTION__) + - ": mraa_i2c_write() failed"); - - return error; -} - -uint16_t -HTU21D::i2cReadReg_16 (int reg) { - uint16_t data; - m_i2ControlCtx.address(m_controlAddr); - data = (uint16_t)m_i2ControlCtx.readReg(reg) << 8; - data |= (uint16_t)m_i2ControlCtx.readReg(reg+1); - return data; -} - -uint8_t -HTU21D::i2cReadReg_8 (int reg) { - m_i2ControlCtx.address(m_controlAddr); - return m_i2ControlCtx.readReg(reg); -} - |