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.cpp
- Committer:
- IanBenzMaxim
- Date:
- 2016-04-14
- Revision:
- 1:e1c7c1c636af
- Child:
- 6:b6bafd0a7013
File content as of revision 1:e1c7c1c636af:
/******************************************************************************* * 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. ******************************************************************************* */ #include <sstream> #include "Display.hpp" #include "mbed.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 //automatically updated and the data is directed to the intended ST7036i device. If the RS bit of the last control byte is set to //logic 0, these command bytes will be decoded and the setting of the device will be changed according to the received commands. enum LCD_Commands { ControlByte = 0x00, //Only one control byte will be sent. Only a stream of data bytes is allowed to follow. ControlByte_RS_Set = 0x40, //Only one control byte will be sent with the RS bit set. Only a stream of data bytes is allowed to follow. ControlBytes = 0x80, //Another control byte will follow, unless an I2C Stop condition is received. ControlBytes_RS_Set = 0xC0, //RS Set and another control byte will follow, unless an I2C Stop condition is received. }; //LCD Instructions enum LCD_Instructions { ClearDisplay = 0x01, Display_OFF = 0x08, //Display off Display_ON = 0x0C, //Display on, cursor off, cursor position off ReturnHome = 0x02, SetDdramAddress = 0x80 }; // LED Driver Port Registers // Initial port state 0x80 enum LED_Driver_Ports { P1 = 0x01, P2 = 0x02, // Blue LED P3 = 0x03, // Green LED P4 = 0x04 // Red LED }; // Convert a byte color value into the representation used by the MAX7306 PWM registers static std::uint8_t convertColorToPwmRegVal(std::uint8_t color) { const std::uint8_t staticOffRegVal = 0x80; // LED is static off by setting to input const std::uint8_t staticOnRegVal = 0x00; // LED is static on const std::uint8_t minOnRegVal = 0x01; // LED on for minimum duty cycle std::uint8_t regVal; if (color == 0x00) // Use static off for no color { regVal = staticOffRegVal; } else if (color == 0xFF) // Use static on for full color { regVal = staticOnRegVal; } else // Use standard PWN for all other values { // The 3 least significant bits cannot be rendered with the MAX7306 regVal = color >> 3; if (regVal == staticOnRegVal) regVal = minOnRegVal; } return regVal; } Display::Display(I2C & I2C_intf, uint8_t LCD_I2C_addr, uint8_t LED_driver_I2C_addr) : m_I2C_intf(I2C_intf), m_LCD_I2C_addr(LCD_I2C_addr), m_LED_driver_I2C_addr(LED_driver_I2C_addr) { } void Display::initialize(void) { initializeLCD(); initializeLED_Driver(); } void Display::initializeLED_Driver(void) { const std::uint8_t Configuration26 = 0x26; //intial port state 0xEC const std::uint8_t Configuration27 = 0x27; //intial port state 0x8F //Intial mode //write to Configuration Register 0x26 m_I2C_intf.start(); m_I2C_intf.write(m_LED_driver_I2C_addr); m_I2C_intf.write(Configuration26); //RST does reset PWM/blink counters, RST resets registers to power-on-reset state m_I2C_intf.write(0x1F); m_I2C_intf.stop(); //Write to Configuration Register 0x27 m_I2C_intf.start(); m_I2C_intf.write(m_LED_driver_I2C_addr); m_I2C_intf.write(Configuration27); //Enable bus time out, set P1,P2,P3 to be controlled by their registers (0x01,0x02,0x03) m_I2C_intf.write(0x0E); m_I2C_intf.stop(); } void Display::setBackLightColor(const Color & color) { // Red m_I2C_intf.start(); m_I2C_intf.write(m_LED_driver_I2C_addr); m_I2C_intf.write(P4); m_I2C_intf.write(convertColorToPwmRegVal(color.R)); m_I2C_intf.stop(); // Green m_I2C_intf.start(); m_I2C_intf.write(m_LED_driver_I2C_addr); m_I2C_intf.write(P3); m_I2C_intf.write(convertColorToPwmRegVal(color.G)); m_I2C_intf.stop(); // Blue m_I2C_intf.start(); m_I2C_intf.write(m_LED_driver_I2C_addr); m_I2C_intf.write(P2); m_I2C_intf.write(convertColorToPwmRegVal(color.B)); m_I2C_intf.stop(); } void Display::clearLine(Line line) { writeCompleteLine("", line); setCursorPosition(line); } void Display::clearDisplay(void) { 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(ClearDisplay); m_I2C_intf.stop(); } void Display::initializeLCD(void) { 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) //When IS[2:1]=(0,1): extension instruction be selected(refer instruction table 1 ) //When IS[2:1]=(1,0): extension instruction be selected(refer instruction table 2 ) m_I2C_intf.write(0x14); //BIAS SET 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(); } void Display::writeCharacter(std::uint8_t character) { m_I2C_intf.start(); m_I2C_intf.write(m_LCD_I2C_addr); m_I2C_intf.write(ControlByte_RS_Set); //No more control bytes will be sent m_I2C_intf.write(character); //Display on, cursor on, cursor position on m_I2C_intf.stop(); } void Display::writeText(const std::string & text) { const char RETURN_CHAR = 0x16; std::size_t length = text.length(); if (length > lineLength) length = lineLength; //Write to LCD m_I2C_intf.start(); m_I2C_intf.write(m_LCD_I2C_addr); m_I2C_intf.write(ControlByte_RS_Set); for(std::size_t i = 0; i < length; i++) { if(text[i] != RETURN_CHAR) m_I2C_intf.write(text[i]); } m_I2C_intf.stop(); } void Display::setCursorPosition(Line line, std::size_t position) { if (position > (lineLength - 1)) // Set to last line character for values outside the upper bound position = (lineLength - 1); m_I2C_intf.start(); m_I2C_intf.write(m_LCD_I2C_addr); m_I2C_intf.write(ControlByte); // No more control bytes will be sent if(line == SecondLine) // Offset for second line position += 0x40; m_I2C_intf.write(SetDdramAddress | position); m_I2C_intf.stop(); } void Display::writeLine(const std::string & text, Line line) { setCursorPosition(line); writeText(text); } void Display::writeCompleteLine(const std::string & text, Line line) { // Add padding to user's string std::string writeText(text); if (writeText.length() < lineLength) writeText.append(lineLength - writeText.length(), ' '); writeLine(writeText, line); } void Display::writeMessage(const std::string & message) { if (message.length() > lineLength) { // Find split point std::istringstream messageStream(message); std::string word; std::size_t splitIndex = 0; do { if (word.length() > 0) splitIndex += (word.length() + 1); std::getline(messageStream, word, ' '); } while ((splitIndex + word.length()) <= lineLength); if (splitIndex == 0) // First word is too long { writeCompleteLine(message.substr(0, lineLength), FirstLine); writeCompleteLine(message.substr(lineLength), SecondLine); } else { writeCompleteLine(message.substr(0, splitIndex - 1), FirstLine); writeCompleteLine(message.substr(splitIndex), SecondLine); } } else { writeCompleteLine(message, FirstLine); writeCompleteLine("", SecondLine); } }