/* * Author: Jon Trulson * Copyright (c) 2016 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 #include #include #include #include #include "rhusb.hpp" using namespace upm; using namespace std; static const int maxBuffer = 1024; // baud rate is always 9600 static const int baudRate = 9600; // conversion from celsius to fahrenheit static float c2f(float c) { return (c * (9.0 / 5.0) + 32.0); } RHUSB::RHUSB(std::string device) : m_uart(device) { m_uart.setBaudRate(baudRate); m_temperature = 0.0; m_humidity = 0.0; } RHUSB::~RHUSB() { } void RHUSB::update() { char *endptr; float value; // first get the temp in C string resp = sendCommand("C"); // convert value = strtof(resp.c_str(), &endptr); // check for conversion failure if (value == 0.0 && resp.c_str() == endptr) { throw std::runtime_error(std::string(__FUNCTION__) + ": strtof() temperature conversion failed"); } m_temperature = value; // now humidity resp = sendCommand("H"); // convert value = strtof(resp.c_str(), &endptr); // check for conversion failure if (value == 0.0 && resp.c_str() == endptr) { throw std::runtime_error(std::string(__FUNCTION__) + ": strtof() humidity conversion failed"); } m_humidity = value; } float RHUSB::getTemperature(bool fahrenheit) { if (fahrenheit) return c2f(m_temperature); else return m_temperature; } float RHUSB::getTemperature() { return getTemperature(false); } float RHUSB::getHumidity() { return m_humidity; } bool RHUSB::dataAvailable(unsigned int millis) { return m_uart.dataAvailable(millis); } string RHUSB::readStr(int len) { return m_uart.readStr(len); } int RHUSB::writeStr(string data) { m_uart.flush(); return m_uart.writeStr(data); } string RHUSB::sendCommand(string cmd) { // make sure we got a command if (cmd.empty()) { throw std::invalid_argument(std::string(__FUNCTION__) + ": cmd is empty!"); } // Terminate the command with a carriage return writeStr(cmd + "\r"); string resp; // I see random timeouts with wait values below 250ms while (dataAvailable(250) && (resp.size() < maxBuffer) ) { resp += readStr(maxBuffer); } if (resp.empty()) { throw std::runtime_error(std::string(__FUNCTION__) + ": " + cmd + " response timed out"); } // check that the last character is the prompt if (resp.at(resp.size() - 1) != '>') { throw std::runtime_error(std::string(__FUNCTION__) + ": " + cmd + " response corrupt"); } // delete the last 3 characters, which should be '\r\n>' resp.erase(resp.size() - 3, 3); return resp; } string RHUSB::getFirmwareID() { string resp = sendCommand("ENQ"); // For readability, replace the intermediate \r\n with a space if found. size_t pos = resp.find("\r\n"); if (pos != string::npos) resp.replace(pos, 2, " "); return resp; }