Maxim Integrated / Mbed OS MAXREFDES155#

DeepCover Embedded Security in IoT: Public-key Secured Data Paths

Dependencies:   MaximInterface

The MAXREFDES155# is an internet-of-things (IoT) embedded-security reference design, built to authenticate and control a sensing node using elliptic-curve-based public-key cryptography with control and notification from a web server.

The hardware includes an ARM® mbed™ shield and attached sensor endpoint. The shield contains a DS2476 DeepCover® ECDSA/SHA-2 coprocessor, Wifi communication, LCD push-button controls, and status LEDs. The sensor endpoint is attached to the shield using a 300mm cable and contains a DS28C36 DeepCover ECDSA/SHA-2 authenticator, IR-thermal sensor, and aiming laser for the IR sensor. The MAXREFDES155# is equipped with a standard Arduino® form-factor shield connector for immediate testing using an mbed board such as the MAX32600MBED#. The combination of these two devices represent an IoT device. Communication to the web server is accomplished with the shield Wifi circuitry. Communication from the shield to the attached sensor module is accomplished over I2C . The sensor module represents an IoT endpoint that generates small data with a requirement for message authenticity/integrity and secure on/off operational control.

The design is hierarchical with each mbed platform and shield communicating data from the sensor node to a web server that maintains a centralized log and dispatches notifications as necessary. The simplicity of this design enables rapid integration into any star-topology IoT network to provide security with the low overhead and cost provided by the ECDSA-P256 asymmetric-key and SHA-256 symmetric-key algorithms.

More information about the MAXREFDES155# is available on the Maxim Integrated website.

Display.cpp@15:75404fab3615, 2018-01-19 (annotated)

Committer:
IanBenzMaxim
Date:
Fri Jan 19 10:28:27 2018 -0600
Revision:
15:75404fab3615
Parent:
13:6a6225690c2e 
Updated MaximInterface revision.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
IanBenzMaxim 0:33d4e66780c0 1 /*******************************************************************************
IanBenzMaxim 0:33d4e66780c0 2 * Copyright (C) 2017 Maxim Integrated Products, Inc., All Rights Reserved.
IanBenzMaxim 0:33d4e66780c0 3 *
IanBenzMaxim 0:33d4e66780c0 4 * Permission is hereby granted, free of charge, to any person obtaining a
IanBenzMaxim 0:33d4e66780c0 5 * copy of this software and associated documentation files (the "Software"),
IanBenzMaxim 0:33d4e66780c0 6 * to deal in the Software without restriction, including without limitation
IanBenzMaxim 0:33d4e66780c0 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
IanBenzMaxim 0:33d4e66780c0 8 * and/or sell copies of the Software, and to permit persons to whom the
IanBenzMaxim 0:33d4e66780c0 9 * Software is furnished to do so, subject to the following conditions:
IanBenzMaxim 0:33d4e66780c0 10 *
IanBenzMaxim 0:33d4e66780c0 11 * The above copyright notice and this permission notice shall be included
IanBenzMaxim 0:33d4e66780c0 12 * in all copies or substantial portions of the Software.
IanBenzMaxim 0:33d4e66780c0 13 *
IanBenzMaxim 0:33d4e66780c0 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
IanBenzMaxim 0:33d4e66780c0 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
IanBenzMaxim 0:33d4e66780c0 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IanBenzMaxim 0:33d4e66780c0 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
IanBenzMaxim 0:33d4e66780c0 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
IanBenzMaxim 0:33d4e66780c0 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
IanBenzMaxim 0:33d4e66780c0 20 * OTHER DEALINGS IN THE SOFTWARE.
IanBenzMaxim 0:33d4e66780c0 21 *
IanBenzMaxim 0:33d4e66780c0 22 * Except as contained in this notice, the name of Maxim Integrated
IanBenzMaxim 0:33d4e66780c0 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
IanBenzMaxim 0:33d4e66780c0 24 * Products, Inc. Branding Policy.
IanBenzMaxim 0:33d4e66780c0 25 *
IanBenzMaxim 0:33d4e66780c0 26 * The mere transfer of this software does not imply any licenses
IanBenzMaxim 0:33d4e66780c0 27 * of trade secrets, proprietary technology, copyrights, patents,
IanBenzMaxim 0:33d4e66780c0 28 * trademarks, maskwork rights, or any other form of intellectual
IanBenzMaxim 0:33d4e66780c0 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
IanBenzMaxim 0:33d4e66780c0 30 * ownership rights.
IanBenzMaxim 0:33d4e66780c0 31 *******************************************************************************/
IanBenzMaxim 0:33d4e66780c0 32
IanBenzMaxim 0:33d4e66780c0 33 #include "Display.hpp"
IanBenzMaxim 0:33d4e66780c0 34
IanBenzMaxim 10:71359af61af8 35 /// @{
IanBenzMaxim 10:71359af61af8 36 /// Width and height of the display in pixels.
IanBenzMaxim 10:71359af61af8 37 static const int width = 128;
IanBenzMaxim 10:71359af61af8 38 static const int height = 64;
IanBenzMaxim 10:71359af61af8 39 /// @}
IanBenzMaxim 10:71359af61af8 40
IanBenzMaxim 13:6a6225690c2e 41 Display::Display(PinName mosi, PinName miso, PinName sclk, PinName ssel,
IanBenzMaxim 13:6a6225690c2e 42 PinName a0)
IanBenzMaxim 13:6a6225690c2e 43 : m_canvas(width, height), spi(mosi, miso, sclk), cs(ssel, 1), a0(a0, 0) {
IanBenzMaxim 13:6a6225690c2e 44 spi.format(8, 3); // CPOL = 1, CPHA = 1
IanBenzMaxim 0:33d4e66780c0 45 }
IanBenzMaxim 0:33d4e66780c0 46
IanBenzMaxim 13:6a6225690c2e 47 void Display::initialize() {
IanBenzMaxim 13:6a6225690c2e 48 sendCommand(0xA0);
IanBenzMaxim 13:6a6225690c2e 49 sendCommand(0xAE);
IanBenzMaxim 13:6a6225690c2e 50 sendCommand(0xC0);
IanBenzMaxim 13:6a6225690c2e 51 sendCommand(0xA2);
IanBenzMaxim 13:6a6225690c2e 52 sendCommand(0x2F);
IanBenzMaxim 13:6a6225690c2e 53 sendCommand(0x26);
IanBenzMaxim 13:6a6225690c2e 54 sendCommand(0x81);
IanBenzMaxim 13:6a6225690c2e 55 sendCommand(0x11);
IanBenzMaxim 13:6a6225690c2e 56 sendCommand(0xAF);
IanBenzMaxim 0:33d4e66780c0 57 }
IanBenzMaxim 0:33d4e66780c0 58
IanBenzMaxim 13:6a6225690c2e 59 void Display::update() {
IanBenzMaxim 13:6a6225690c2e 60 const int rowsPerPage = 8;
IanBenzMaxim 13:6a6225690c2e 61 const int pages = height / rowsPerPage;
IanBenzMaxim 13:6a6225690c2e 62 sendCommand(0xAE);
IanBenzMaxim 13:6a6225690c2e 63 sendCommand(0x40);
IanBenzMaxim 13:6a6225690c2e 64 for (int page = 0; page < pages; page++) {
IanBenzMaxim 13:6a6225690c2e 65 sendCommand(0xB0 + static_cast<uint8_t>(page));
IanBenzMaxim 13:6a6225690c2e 66 sendCommand(0x10);
IanBenzMaxim 13:6a6225690c2e 67 sendCommand(0x00);
IanBenzMaxim 13:6a6225690c2e 68 for (int column = 0; column < width; column++) {
IanBenzMaxim 13:6a6225690c2e 69 uint8_t segment = 0;
IanBenzMaxim 13:6a6225690c2e 70 for (int pixel = 0; pixel < rowsPerPage; pixel++) {
IanBenzMaxim 13:6a6225690c2e 71 segment <<= 1;
IanBenzMaxim 13:6a6225690c2e 72 if (m_canvas.pixelEnabled(column,
IanBenzMaxim 13:6a6225690c2e 73 ((pages - 1 - page) * rowsPerPage) + pixel)) {
IanBenzMaxim 13:6a6225690c2e 74 segment |= 1;
IanBenzMaxim 0:33d4e66780c0 75 }
IanBenzMaxim 13:6a6225690c2e 76 }
IanBenzMaxim 13:6a6225690c2e 77 sendData(segment);
IanBenzMaxim 0:33d4e66780c0 78 }
IanBenzMaxim 13:6a6225690c2e 79 }
IanBenzMaxim 13:6a6225690c2e 80 sendCommand(0xAF);
IanBenzMaxim 0:33d4e66780c0 81 }
IanBenzMaxim 0:33d4e66780c0 82
IanBenzMaxim 13:6a6225690c2e 83 void Display::sendCommand(uint8_t command) {
IanBenzMaxim 13:6a6225690c2e 84 cs = 0;
IanBenzMaxim 13:6a6225690c2e 85 a0 = 0;
IanBenzMaxim 13:6a6225690c2e 86 spi.write(command);
IanBenzMaxim 13:6a6225690c2e 87 cs = 1;
IanBenzMaxim 0:33d4e66780c0 88 }
IanBenzMaxim 0:33d4e66780c0 89
IanBenzMaxim 13:6a6225690c2e 90 void Display::sendData(uint8_t data) {
IanBenzMaxim 13:6a6225690c2e 91 cs = 0;
IanBenzMaxim 13:6a6225690c2e 92 a0 = 1;
IanBenzMaxim 13:6a6225690c2e 93 spi.write(data);
IanBenzMaxim 13:6a6225690c2e 94 cs = 1;
IanBenzMaxim 0:33d4e66780c0 95 }