MAXREFDES143#: DeepCover Embedded Security in IoT Authenticated Sensing & Notification
Dependencies: MaximInterface mbed
The MAXREFDES143# is an Internet of Things (IoT) embedded security reference design, built to protect an industrial sensing node by means of authentication and notification to a web server. The hardware includes a peripheral module representing a protected sensor node monitoring operating temperature and remaining life of a filter (simulated through ambient light sensing) and an mbed shield representing a controller node responsible for monitoring one or more sensor nodes. The design is hierarchical with each controller node communicating data from connected sensor nodes to a web server that maintains a centralized log and dispatches notifications as necessary. The mbed shield contains a Wi-Fi module, a DS2465 coprocessor with 1-Wire® master function, an LCD, LEDs, and pushbuttons. The protected sensor node contains a DS28E15 authenticator, a DS7505 temperature sensor, and a MAX44009 light sensor. The mbed shield communicates to a web server by the onboard Wi-Fi module and to the protected sensor node with I2C and 1-Wire. The MAXREFDES143# is equipped with a standard shield connector for immediate testing using an mbed board such as the MAX32600MBED#. The simplicity of this design enables rapid integration into any star-topology IoT network requiring the heightened security with low overhead provided by the SHA-256 symmetric-key algorithm.
More information about the MAXREFDES143# is available on the Maxim Integrated website.
MAX44009.cpp
- Committer:
- IanBenzMaxim
- Date:
- 2018-01-19
- Revision:
- 35:3d414ba9ab6c
- Parent:
- 32:0a09505a656d
File content as of revision 35:3d414ba9ab6c:
/******************************************************************************* * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved. * * 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 MAXIM INTEGRATED 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. * * Except as contained in this notice, the name of Maxim Integrated * Products, Inc. shall not be used except as stated in the Maxim Integrated * Products, Inc. Branding Policy. * * The mere transfer of this software does not imply any licenses * of trade secrets, proprietary technology, copyrights, patents, * trademarks, maskwork rights, or any other form of intellectual * property whatsoever. Maxim Integrated Products, Inc. retains all * ownership rights. *******************************************************************************/ #include <I2C.h> #include "MAX44009.hpp" static const int I2C_OK = 0; MAX44009::MAX44009(mbed::I2C & I2C_interface, uint8_t I2C_address) : m_I2C_interface(I2C_interface), m_I2C_address(I2C_address) {} MAX44009::Result MAX44009::read_current_lux(double & lux) const { uint8_t I2C_data, mantissa, exponent; I2C_data = Lux_High_Byte_Reg; if (m_I2C_interface.write(m_I2C_address, reinterpret_cast<char *>(&I2C_data), 1, true) != I2C_OK) { m_I2C_interface.stop(); return Hardware_Failure; } if (m_I2C_interface.read(m_I2C_address, reinterpret_cast<char *>(&I2C_data), 1, true) != I2C_OK) { m_I2C_interface.stop(); return Hardware_Failure; } mantissa = (I2C_data << 4); exponent = (I2C_data >> 4); I2C_data = Lux_Low_Byte_Reg; if (m_I2C_interface.write(m_I2C_address, reinterpret_cast<char *>(&I2C_data), 1, true) != I2C_OK) { m_I2C_interface.stop(); return Hardware_Failure; } if (m_I2C_interface.read(m_I2C_address, reinterpret_cast<char *>(&I2C_data), 1, false) != I2C_OK) { m_I2C_interface.stop(); return Hardware_Failure; } mantissa |= (I2C_data & 0x0F); unsigned long calc_result = 1; if (exponent > 0) { calc_result <<= exponent; } calc_result *= mantissa; lux = calc_result * 0.045; return Success; }