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: DS7505.hpp
- Revision:
- 32:0a09505a656d
- Parent:
- 24:434330962308
diff -r 7b10bcb3e0fc -r 0a09505a656d DS7505.hpp
--- a/DS7505.hpp Tue Apr 04 14:10:48 2017 -0500
+++ b/DS7505.hpp Mon Nov 06 17:34:13 2017 -0600
@@ -28,110 +28,101 @@
* 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;
-}
+namespace mbed { class I2C; }
/// Interface to the DS7505 temperature sensor.
-class DS7505
-{
+class DS7505 {
public:
- enum Result
- {
- Success,
- Hardware_Failure,
- Out_of_Range
- };
-
+ 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.
+ /// @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
- {
+ enum Config_Resolution {
Config_9b_Res = 0x00,
Config_10b_Res = 0x20,
Config_11b_Res = 0x40,
Config_12b_Res = 0x60
};
-
+
/// DS7505 Register addresses.
- enum Register
- {
+ enum Register {
Temperature_Reg = 0x00,
Configuration_Reg = 0x01,
Thyst_Reg = 0x02,
Tos_Reg = 0x03
};
-
+
/// Represents a DS7505 configuration.
- struct Config
- {
+ 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) { }
+ : 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.
+
+ /// Returns the maximum time needed in milliseconds 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.
+
+ /// 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.
+ /// @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
MAXREFDES143#: DeepCover Embedded Security in IoT Authenticated Sensing & Notification