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: Display.cpp
- Revision:
- 17:41be4896ed6d
- Parent:
- 6:b6bafd0a7013
- Child:
- 32:0a09505a656d
diff -r 6bce01c1dd90 -r 41be4896ed6d Display.cpp --- a/Display.cpp Wed Jun 15 15:16:15 2016 -0500 +++ b/Display.cpp Thu Jul 21 11:06:13 2016 -0500 @@ -34,6 +34,7 @@ #include <sstream> #include "Display.hpp" #include "I2C.h" +#include "wait_api.h" //LCD Commands //If the RS bit is set to logic 1, these display bytes are stored in the display RAM at the address specified by the data pointer. The data pointer is @@ -172,7 +173,6 @@ m_I2C_intf.start(); m_I2C_intf.write(m_LCD_I2C_addr); m_I2C_intf.write(ControlByte); //No more control bytes will be sent - //************************************************************************************ m_I2C_intf.write(0x38); //Function Set IS[2:1] = 0,0 (&h38 = Single height font, 0x3C = double height font) m_I2C_intf.write(0x39); //Function Set IS[2:1] = (0,1) //When IS[2:1]=(0,0): normal instruction be selected(refer instruction table 0) @@ -182,10 +182,14 @@ m_I2C_intf.write(0x70); //CONTRAST (was 0x78) m_I2C_intf.write(0x5E); //POWER/ICON CONTROL/CONTRAST (upper two bits) m_I2C_intf.write(0x6D); //FOLLOWER CONTROL - m_I2C_intf.write(Display_ON); //Display on, cursor on, cursor position on - m_I2C_intf.write(ClearDisplay); //Clear Display - m_I2C_intf.write(0x06); //ENTRY MODE - //************************************************************************************ + m_I2C_intf.stop(); + wait_ms(200); //Wait for power stable + m_I2C_intf.start(); + m_I2C_intf.write(m_LCD_I2C_addr); + m_I2C_intf.write(ControlByte); //No more control bytes will be sent + m_I2C_intf.write(Display_ON); //Display on, cursor on, cursor position on + m_I2C_intf.write(ClearDisplay); //Clear Display + m_I2C_intf.write(0x06); //ENTRY MODE m_I2C_intf.stop(); }