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.
Diff: MAX44009.cpp
- Revision:
- 1:e1c7c1c636af
- Child:
- 6:b6bafd0a7013
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MAX44009.cpp Thu Apr 14 19:48:01 2016 +0000 @@ -0,0 +1,86 @@ +/******************************************************************************* +* 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 "MAX44009.hpp" +#include "mbed.h" + +static const int I2C_OK = 0; + +MAX44009::MAX44009(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 +{ + char I2C_data; + uint8_t mantissa, exponent; + + I2C_data = Lux_High_Byte_Reg; + if (m_I2C_interface.write(m_I2C_address, &I2C_data, 1, true) != I2C_OK) + { + m_I2C_interface.stop(); + return Hardware_Failure; + } + if (m_I2C_interface.read(m_I2C_address, &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, &I2C_data, 1, true) != I2C_OK) + { + m_I2C_interface.stop(); + return Hardware_Failure; + } + if (m_I2C_interface.read(m_I2C_address, &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; +} \ No newline at end of file