Maxim Integrated / Mbed 2 deprecated DeepCover Embedded Security in IoT

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@6:b6bafd0a7013, 2016-05-12 (annotated)

Committer:
IanBenzMaxim
Date:
Thu May 12 14:40:14 2016 -0500
Revision:
6:b6bafd0a7013
Parent:
1:e1c7c1c636af
Child:
15:8cc4cdea59da
Updated following downstream restructuring in OneWire library.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
IanBenzMaxim 1:e1c7c1c636af 1 /*******************************************************************************
IanBenzMaxim 1:e1c7c1c636af 2 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
IanBenzMaxim 1:e1c7c1c636af 3 *
IanBenzMaxim 1:e1c7c1c636af 4 * Permission is hereby granted, free of charge, to any person obtaining a
IanBenzMaxim 1:e1c7c1c636af 5 * copy of this software and associated documentation files (the "Software"),
IanBenzMaxim 1:e1c7c1c636af 6 * to deal in the Software without restriction, including without limitation
IanBenzMaxim 1:e1c7c1c636af 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
IanBenzMaxim 1:e1c7c1c636af 8 * and/or sell copies of the Software, and to permit persons to whom the
IanBenzMaxim 1:e1c7c1c636af 9 * Software is furnished to do so, subject to the following conditions:
IanBenzMaxim 1:e1c7c1c636af 10 *
IanBenzMaxim 1:e1c7c1c636af 11 * The above copyright notice and this permission notice shall be included
IanBenzMaxim 1:e1c7c1c636af 12 * in all copies or substantial portions of the Software.
IanBenzMaxim 1:e1c7c1c636af 13 *
IanBenzMaxim 1:e1c7c1c636af 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
IanBenzMaxim 1:e1c7c1c636af 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
IanBenzMaxim 1:e1c7c1c636af 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IanBenzMaxim 1:e1c7c1c636af 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
IanBenzMaxim 1:e1c7c1c636af 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
IanBenzMaxim 1:e1c7c1c636af 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
IanBenzMaxim 1:e1c7c1c636af 20 * OTHER DEALINGS IN THE SOFTWARE.
IanBenzMaxim 1:e1c7c1c636af 21 *
IanBenzMaxim 1:e1c7c1c636af 22 * Except as contained in this notice, the name of Maxim Integrated
IanBenzMaxim 1:e1c7c1c636af 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
IanBenzMaxim 1:e1c7c1c636af 24 * Products, Inc. Branding Policy.
IanBenzMaxim 1:e1c7c1c636af 25 *
IanBenzMaxim 1:e1c7c1c636af 26 * The mere transfer of this software does not imply any licenses
IanBenzMaxim 1:e1c7c1c636af 27 * of trade secrets, proprietary technology, copyrights, patents,
IanBenzMaxim 1:e1c7c1c636af 28 * trademarks, maskwork rights, or any other form of intellectual
IanBenzMaxim 1:e1c7c1c636af 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
IanBenzMaxim 1:e1c7c1c636af 30 * ownership rights.
IanBenzMaxim 1:e1c7c1c636af 31 *******************************************************************************
IanBenzMaxim 1:e1c7c1c636af 32 */
IanBenzMaxim 1:e1c7c1c636af 33
IanBenzMaxim 1:e1c7c1c636af 34 #include "MAX44009.hpp"
IanBenzMaxim 6:b6bafd0a7013 35 #include "I2C.h"
IanBenzMaxim 1:e1c7c1c636af 36
IanBenzMaxim 1:e1c7c1c636af 37 static const int I2C_OK = 0;
IanBenzMaxim 1:e1c7c1c636af 38
IanBenzMaxim 6:b6bafd0a7013 39 MAX44009::MAX44009(mbed::I2C & I2C_interface, uint8_t I2C_address)
IanBenzMaxim 1:e1c7c1c636af 40 : m_I2C_interface(I2C_interface), m_I2C_address(I2C_address)
IanBenzMaxim 1:e1c7c1c636af 41 {
IanBenzMaxim 1:e1c7c1c636af 42
IanBenzMaxim 1:e1c7c1c636af 43 }
IanBenzMaxim 1:e1c7c1c636af 44
IanBenzMaxim 1:e1c7c1c636af 45 MAX44009::Result MAX44009::read_current_lux(double & lux) const
IanBenzMaxim 1:e1c7c1c636af 46 {
IanBenzMaxim 1:e1c7c1c636af 47 char I2C_data;
IanBenzMaxim 1:e1c7c1c636af 48 uint8_t mantissa, exponent;
IanBenzMaxim 1:e1c7c1c636af 49
IanBenzMaxim 1:e1c7c1c636af 50 I2C_data = Lux_High_Byte_Reg;
IanBenzMaxim 1:e1c7c1c636af 51 if (m_I2C_interface.write(m_I2C_address, &I2C_data, 1, true) != I2C_OK)
IanBenzMaxim 1:e1c7c1c636af 52 {
IanBenzMaxim 1:e1c7c1c636af 53 m_I2C_interface.stop();
IanBenzMaxim 1:e1c7c1c636af 54 return Hardware_Failure;
IanBenzMaxim 1:e1c7c1c636af 55 }
IanBenzMaxim 1:e1c7c1c636af 56 if (m_I2C_interface.read(m_I2C_address, &I2C_data, 1, true) != I2C_OK)
IanBenzMaxim 1:e1c7c1c636af 57 {
IanBenzMaxim 1:e1c7c1c636af 58 m_I2C_interface.stop();
IanBenzMaxim 1:e1c7c1c636af 59 return Hardware_Failure;
IanBenzMaxim 1:e1c7c1c636af 60 }
IanBenzMaxim 1:e1c7c1c636af 61 mantissa = (I2C_data << 4);
IanBenzMaxim 1:e1c7c1c636af 62 exponent = (I2C_data >> 4);
IanBenzMaxim 1:e1c7c1c636af 63
IanBenzMaxim 1:e1c7c1c636af 64 I2C_data = Lux_Low_Byte_Reg;
IanBenzMaxim 1:e1c7c1c636af 65 if (m_I2C_interface.write(m_I2C_address, &I2C_data, 1, true) != I2C_OK)
IanBenzMaxim 1:e1c7c1c636af 66 {
IanBenzMaxim 1:e1c7c1c636af 67 m_I2C_interface.stop();
IanBenzMaxim 1:e1c7c1c636af 68 return Hardware_Failure;
IanBenzMaxim 1:e1c7c1c636af 69 }
IanBenzMaxim 1:e1c7c1c636af 70 if (m_I2C_interface.read(m_I2C_address, &I2C_data, 1, false) != I2C_OK)
IanBenzMaxim 1:e1c7c1c636af 71 {
IanBenzMaxim 1:e1c7c1c636af 72 m_I2C_interface.stop();
IanBenzMaxim 1:e1c7c1c636af 73 return Hardware_Failure;
IanBenzMaxim 1:e1c7c1c636af 74 }
IanBenzMaxim 1:e1c7c1c636af 75 mantissa |= (I2C_data & 0x0F);
IanBenzMaxim 1:e1c7c1c636af 76
IanBenzMaxim 1:e1c7c1c636af 77 unsigned long calc_result = 1;
IanBenzMaxim 1:e1c7c1c636af 78 if (exponent > 0)
IanBenzMaxim 1:e1c7c1c636af 79 {
IanBenzMaxim 1:e1c7c1c636af 80 calc_result <<= exponent;
IanBenzMaxim 1:e1c7c1c636af 81 }
IanBenzMaxim 1:e1c7c1c636af 82 calc_result *= mantissa;
IanBenzMaxim 1:e1c7c1c636af 83 lux = calc_result * 0.045;
IanBenzMaxim 1:e1c7c1c636af 84
IanBenzMaxim 1:e1c7c1c636af 85 return Success;
IanBenzMaxim 1:e1c7c1c636af 86 }