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.

Display.hpp

Committer:
IanBenzMaxim
Date:
19 months ago
Revision:
35:3d414ba9ab6c
Parent:
32:0a09505a656d

File content as of revision 35:3d414ba9ab6c:

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#ifndef DISPLAY_HPP
#define DISPLAY_HPP

#include <stdint.h>
#include <stddef.h>
#include <string>

namespace mbed { class I2C; }

/// Interface to the Newhaven Display NHD-C0220BiZ-FS(RGB)-FBW-3VM LCD module
/// and MAX7306 PWM LED driver for backlight color selection.
class Display {
public:
  /// Display line referenced from top
  enum Line { FirstLine = 0, SecondLine };

  /// 24-bit RGB color for the backlight.
  struct Color {
    uint8_t R, G, B;
  };

  /// Length in character os a display line.
  static const size_t lineLength = 20;

  /// @param I2C_interface A configured I2C interface to use for communication.
  /// @param LCD_I2C_address LCD module bus address in mbed format.
  /// @param LED_driver_I2C_addr PWM LED driver (MAX7306) bus address in mbed format.
  Display(mbed::I2C & I2C_intf, uint8_t LCD_I2C_addr,
          uint8_t LED_driver_I2C_addr);

  /// Initialize display components.
  void initialize();

  /// Clear all display lines.
  void clearDisplay();

  /// Clear a specific display line.
  void clearLine(Line line);

  /// Write a single character to the display at the current cursor position.
  void writeCharacter(uint8_t character);

  /// Write text to the display at the current cursor position.
  void writeText(const std::string & text);

  /// Set cursor to a certain line and zero-index position within the line.
  void setCursorPosition(Line line, size_t position = 0);

  /// Writes text to the display starting at the beginning of the line.
  void writeLine(const std::string & text, Line line);

  /// Writes text to the display starting at the beginning of the line and
  /// clears the remainder of the line.
  void writeCompleteLine(const std::string & text, Line line);

  /// Writes a message to the display with text wrapping allowed at spaces.
  void writeMessage(const std::string & text);

  /// Set the display backlight to a certain color.
  void setBackLightColor(const Color & color);

private:
  mbed::I2C & m_I2C_intf;
  uint8_t m_LCD_I2C_addr, m_LED_driver_I2C_addr;

  void initializeLCD();
  void initializeLED_Driver();
};

#endif