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.
DS7505.hpp
- Committer:
- IanBenzMaxim
- Date:
- 2016-05-27
- Revision:
- 13:6e753e78987c
- Parent:
- 6:b6bafd0a7013
- Child:
- 24:434330962308
File content as of revision 13:6e753e78987c:
/******************************************************************************* * 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. ******************************************************************************* */ #ifndef _DS7505_HPP #define _DS7505_HPP #include <stdint.h> namespace mbed { class I2C; } /// Interface to the DS7505 temperature sensor. class DS7505 { public: enum Result { Success, Hardware_Failure, Out_of_Range }; /// @param I2C_interface A configured I2C interface to use for communication. /// @param I2C_address Device bus address in mbed format. DS7505(mbed::I2C & I2C_interface, uint8_t I2C_address); /// Set the resolution for temperature conversions. /// @param resolution Number of decimal bit from 1 to 4. Result set_resolution(uint8_t resolution); /// Reads the current temperature with an exponent of 10^-2. /// @note Compatible with Bluetooth characteristic: org.bluetooth.characteristic.temperature. Result read_current_temp(int16_t & temperature) const; /// Reads the current temperature as a floating point value. Result read_current_temp(double & temperature) const; /// Reads the current temperature as an integer value. Result read_current_temp(int8_t & temperature) const; private: /// Bit resolution of temperature conversions. enum Config_Resolution { Config_9b_Res = 0x00, Config_10b_Res = 0x20, Config_11b_Res = 0x40, Config_12b_Res = 0x60 }; /// DS7505 Register addresses. enum Register { Temperature_Reg = 0x00, Configuration_Reg = 0x01, Thyst_Reg = 0x02, Tos_Reg = 0x03 }; /// Represents a DS7505 configuration. struct Config { Config_Resolution resolution; bool enable_shutdown_mode; Config(Config_Resolution resolution, bool enable_shutdown_mode) : resolution(resolution), enable_shutdown_mode(enable_shutdown_mode) { } }; /// @note Mark as mutable to allow manipulation by read_temp_sensor(). mutable Config m_current_config; mbed::I2C & m_I2C_interface; uint8_t m_I2C_address; /// Returns the maximum time needed in ms for a sample at the specified resolution. static uint8_t get_measure_delay_ms(Config_Resolution resolution); /// Reads the current temperature via I2C. /// Assumes that the I2C register pointer is already set to the temperature register. /// @param sensor_data Output for raw data from DS7505 with upper and lower bytes combined. /// @returns True on success. bool read_temp_sensor_data(uint16_t & sensor_data) const; /// Reads the current temperature with support for shutdown mode. /// @param sensor_data Output for raw data from DS7505 with upper and lower bytes combined. /// @returns Success or Hardware_Failure. Result read_temp_sensor(uint16_t & sensor_data) const; /// Sets the I2C register pointer for the next operation. /// @param pointer_reg Desired register to set. /// @returns True on success. /// @note Allow marking const since not public. bool set_register_pointer(Register pointer_reg) const; /// Writes to a device register via I2C. /// @param write_reg Register to write to. /// @param write_val Value to write to the register. /// @returns True on success. /// @note Allow marking const since not public bool write_register(Register write_reg, uint8_t write_val) const; /// Writes the current configuration via I2C. /// @returns True on success. /// @note Allow marking const since not public bool write_current_config() const; }; #endif