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.

DS7505.hpp@35:3d414ba9ab6c, 2018-01-19 (annotated)

Committer:
IanBenzMaxim
Date:
Fri Jan 19 10:33:16 2018 -0600
Revision:
35:3d414ba9ab6c
Parent:
32:0a09505a656d 
Updated MaximInterface revision.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
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IanBenzMaxim 32:0a09505a656d 31 *******************************************************************************/
IanBenzMaxim 1:e1c7c1c636af 32
IanBenzMaxim 24:434330962308 33 #ifndef DS7505_HPP
IanBenzMaxim 24:434330962308 34 #define DS7505_HPP
IanBenzMaxim 1:e1c7c1c636af 35
IanBenzMaxim 6:b6bafd0a7013 36 #include <stdint.h>
IanBenzMaxim 1:e1c7c1c636af 37
IanBenzMaxim 32:0a09505a656d 38 namespace mbed { class I2C; }
IanBenzMaxim 1:e1c7c1c636af 39
IanBenzMaxim 1:e1c7c1c636af 40 /// Interface to the DS7505 temperature sensor.
IanBenzMaxim 32:0a09505a656d 41 class DS7505 {
IanBenzMaxim 1:e1c7c1c636af 42 public:
IanBenzMaxim 32:0a09505a656d 43 enum Result { Success, Hardware_Failure, Out_of_Range };
IanBenzMaxim 32:0a09505a656d 44
IanBenzMaxim 1:e1c7c1c636af 45 /// @param I2C_interface A configured I2C interface to use for communication.
IanBenzMaxim 1:e1c7c1c636af 46 /// @param I2C_address Device bus address in mbed format.
IanBenzMaxim 6:b6bafd0a7013 47 DS7505(mbed::I2C & I2C_interface, uint8_t I2C_address);
IanBenzMaxim 32:0a09505a656d 48
IanBenzMaxim 1:e1c7c1c636af 49 /// Set the resolution for temperature conversions.
IanBenzMaxim 1:e1c7c1c636af 50 /// @param resolution Number of decimal bit from 1 to 4.
IanBenzMaxim 6:b6bafd0a7013 51 Result set_resolution(uint8_t resolution);
IanBenzMaxim 32:0a09505a656d 52
IanBenzMaxim 1:e1c7c1c636af 53 /// Reads the current temperature with an exponent of 10^-2.
IanBenzMaxim 32:0a09505a656d 54 /// @note Compatible with Bluetooth characteristic:
IanBenzMaxim 32:0a09505a656d 55 /// org.bluetooth.characteristic.temperature.
IanBenzMaxim 13:6e753e78987c 56 Result read_current_temp(int16_t & temperature) const;
IanBenzMaxim 32:0a09505a656d 57
IanBenzMaxim 1:e1c7c1c636af 58 /// Reads the current temperature as a floating point value.
IanBenzMaxim 1:e1c7c1c636af 59 Result read_current_temp(double & temperature) const;
IanBenzMaxim 32:0a09505a656d 60
IanBenzMaxim 1:e1c7c1c636af 61 /// Reads the current temperature as an integer value.
IanBenzMaxim 13:6e753e78987c 62 Result read_current_temp(int8_t & temperature) const;
IanBenzMaxim 32:0a09505a656d 63
IanBenzMaxim 1:e1c7c1c636af 64 private:
IanBenzMaxim 1:e1c7c1c636af 65 /// Bit resolution of temperature conversions.
IanBenzMaxim 32:0a09505a656d 66 enum Config_Resolution {
IanBenzMaxim 1:e1c7c1c636af 67 Config_9b_Res = 0x00,
IanBenzMaxim 1:e1c7c1c636af 68 Config_10b_Res = 0x20,
IanBenzMaxim 1:e1c7c1c636af 69 Config_11b_Res = 0x40,
IanBenzMaxim 1:e1c7c1c636af 70 Config_12b_Res = 0x60
IanBenzMaxim 1:e1c7c1c636af 71 };
IanBenzMaxim 32:0a09505a656d 72
IanBenzMaxim 1:e1c7c1c636af 73 /// DS7505 Register addresses.
IanBenzMaxim 32:0a09505a656d 74 enum Register {
IanBenzMaxim 1:e1c7c1c636af 75 Temperature_Reg = 0x00,
IanBenzMaxim 1:e1c7c1c636af 76 Configuration_Reg = 0x01,
IanBenzMaxim 1:e1c7c1c636af 77 Thyst_Reg = 0x02,
IanBenzMaxim 1:e1c7c1c636af 78 Tos_Reg = 0x03
IanBenzMaxim 1:e1c7c1c636af 79 };
IanBenzMaxim 32:0a09505a656d 80
IanBenzMaxim 1:e1c7c1c636af 81 /// Represents a DS7505 configuration.
IanBenzMaxim 32:0a09505a656d 82 struct Config {
IanBenzMaxim 1:e1c7c1c636af 83 Config_Resolution resolution;
IanBenzMaxim 1:e1c7c1c636af 84 bool enable_shutdown_mode;
IanBenzMaxim 32:0a09505a656d 85
IanBenzMaxim 1:e1c7c1c636af 86 Config(Config_Resolution resolution, bool enable_shutdown_mode)
IanBenzMaxim 32:0a09505a656d 87 : resolution(resolution), enable_shutdown_mode(enable_shutdown_mode) {}
IanBenzMaxim 1:e1c7c1c636af 88 };
IanBenzMaxim 32:0a09505a656d 89
IanBenzMaxim 1:e1c7c1c636af 90 /// @note Mark as mutable to allow manipulation by read_temp_sensor().
IanBenzMaxim 1:e1c7c1c636af 91 mutable Config m_current_config;
IanBenzMaxim 32:0a09505a656d 92
IanBenzMaxim 1:e1c7c1c636af 93 mbed::I2C & m_I2C_interface;
IanBenzMaxim 6:b6bafd0a7013 94 uint8_t m_I2C_address;
IanBenzMaxim 32:0a09505a656d 95
IanBenzMaxim 32:0a09505a656d 96 /// Returns the maximum time needed in milliseconds for a sample at the
IanBenzMaxim 32:0a09505a656d 97 /// specified resolution.
IanBenzMaxim 6:b6bafd0a7013 98 static uint8_t get_measure_delay_ms(Config_Resolution resolution);
IanBenzMaxim 32:0a09505a656d 99
IanBenzMaxim 32:0a09505a656d 100 /// Reads the current temperature via I2C. Assumes that the I2C register
IanBenzMaxim 32:0a09505a656d 101 /// pointer is already set to the temperature register.
IanBenzMaxim 32:0a09505a656d 102 /// @param sensor_data
IanBenzMaxim 32:0a09505a656d 103 /// Output for raw data from DS7505 with upper and lower bytes combined.
IanBenzMaxim 1:e1c7c1c636af 104 /// @returns True on success.
IanBenzMaxim 6:b6bafd0a7013 105 bool read_temp_sensor_data(uint16_t & sensor_data) const;
IanBenzMaxim 32:0a09505a656d 106
IanBenzMaxim 1:e1c7c1c636af 107 /// Reads the current temperature with support for shutdown mode.
IanBenzMaxim 32:0a09505a656d 108 /// @param sensor_data Output for raw data from DS7505 with upper and lower
IanBenzMaxim 32:0a09505a656d 109 /// bytes combined.
IanBenzMaxim 1:e1c7c1c636af 110 /// @returns Success or Hardware_Failure.
IanBenzMaxim 6:b6bafd0a7013 111 Result read_temp_sensor(uint16_t & sensor_data) const;
IanBenzMaxim 32:0a09505a656d 112
IanBenzMaxim 1:e1c7c1c636af 113 /// Sets the I2C register pointer for the next operation.
IanBenzMaxim 1:e1c7c1c636af 114 /// @param pointer_reg Desired register to set.
IanBenzMaxim 1:e1c7c1c636af 115 /// @returns True on success.
IanBenzMaxim 1:e1c7c1c636af 116 /// @note Allow marking const since not public.
IanBenzMaxim 1:e1c7c1c636af 117 bool set_register_pointer(Register pointer_reg) const;
IanBenzMaxim 32:0a09505a656d 118
IanBenzMaxim 1:e1c7c1c636af 119 /// Writes to a device register via I2C.
IanBenzMaxim 1:e1c7c1c636af 120 /// @param write_reg Register to write to.
IanBenzMaxim 1:e1c7c1c636af 121 /// @param write_val Value to write to the register.
IanBenzMaxim 1:e1c7c1c636af 122 /// @returns True on success.
IanBenzMaxim 1:e1c7c1c636af 123 /// @note Allow marking const since not public
IanBenzMaxim 6:b6bafd0a7013 124 bool write_register(Register write_reg, uint8_t write_val) const;
IanBenzMaxim 32:0a09505a656d 125
IanBenzMaxim 1:e1c7c1c636af 126 /// Writes the current configuration via I2C.
IanBenzMaxim 1:e1c7c1c636af 127 /// @returns True on success.
IanBenzMaxim 1:e1c7c1c636af 128 /// @note Allow marking const since not public
IanBenzMaxim 1:e1c7c1c636af 129 bool write_current_config() const;
IanBenzMaxim 1:e1c7c1c636af 130 };
IanBenzMaxim 1:e1c7c1c636af 131
IanBenzMaxim 1:e1c7c1c636af 132 #endif