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148 lines
3.6 KiB
C++
148 lines
3.6 KiB
C++
/*
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* Author: Norbert Wesp <nwesp@phytec.de>
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* Copyright (c) 2017 Phytec Messtechnik GmbH.
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*
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* based on: RIOT-driver hdc1000 by Johann Fischer <j.fischer@phytec.de>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <iostream>
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#include <string>
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#include <stdexcept>
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#include <unistd.h>
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#include <stdlib.h>
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#include <endian.h>
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#include "hdc1000.hpp"
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using namespace upm;
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HDC1000::HDC1000(int bus, int devAddr) : m_i2ControlCtx(bus) {
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m_temperature = 0;
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m_humidity = 0;
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m_name = HDC1000_NAME;
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m_controlAddr = devAddr;
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m_bus = bus;
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mraa::Result ret = m_i2ControlCtx.address(m_controlAddr);
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if (ret != mraa::SUCCESS) {
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throw std::invalid_argument(std::string(__FUNCTION__) +
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": mraa_i2c_address() failed");
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}
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if (checkID() != 0) {
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/* sensor_id does not match! maybe wrong sensor chosen? */
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throw std::invalid_argument(std::string(__FUNCTION__) +
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": checkID() failed");
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}
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sampleData();
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}
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int
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HDC1000::checkID(void)
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{
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uint8_t tmp[2];
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uint16_t id;
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int re = 0;
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re = m_i2ControlCtx.readBytesReg(HDC1000_DEVICE_ID_REG, tmp, 2);
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if (re != 2) {
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/* not enough bytes were read! */
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return -1;
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}
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id = ((uint16_t)tmp[0] << 8) | tmp[1];
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if (id != HDC1000_DEVICE_ID) {
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return -1;
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}
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return 0;
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}
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void
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HDC1000::resetSensor(void)
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{
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mraa::Result ret = m_i2ControlCtx.writeByte(0);
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if (ret != mraa::SUCCESS) {
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throw std::invalid_argument(std::string(__FUNCTION__) +
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": mraa_i2c_write_byte() failed");
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}
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usleep(SLEEP_SEC);
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}
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void
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HDC1000::sampleData(void)
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{
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uint8_t itemp[4];
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uint16_t traw, hraw;
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int re = 0;
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resetSensor();
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re = m_i2ControlCtx.read(itemp, 4);
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if (re != 4) {
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/* not enough bytes were read! */
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throw std::invalid_argument(std::string(__FUNCTION__) +
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": mraa_i2c_read(4) failed");
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}
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traw = ((uint16_t)itemp[0] << 8) | itemp[1];
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m_temperature = ((((int32_t)traw * 16500) >> 16) -4000);
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hraw = ((uint16_t)itemp[2] << 8) | itemp[3];
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m_humidity = (((int32_t)hraw * 10000) >> 16);
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}
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float
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HDC1000::getTemperature(int bSampleData)
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{
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if (bSampleData) {
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sampleData();
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}
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return (float)(m_temperature * 0.01);
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}
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float
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HDC1000::getTemperature()
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{
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return getTemperature(false);
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}
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float
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HDC1000::getHumidity(int bSampleData)
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{
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if (bSampleData) {
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sampleData();
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}
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return (float)(m_humidity * 0.01);
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}
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float
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HDC1000::getHumidity()
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{
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return getHumidity(false);
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}
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