CSCE 236: Embedded Systems
Spring 2021

Instructor

Jeffrey Falkinburg
Computer Science and Engineering
368 Avery Hall
jfalkinburg2@unl.edu
Office Hours:
TBD via Zoom
and by appointment.

Teaching Assistants

Undergraduate TAs:
See Canvas
Office Hours:
TBD

Course Information

Tuesday Lecture: 9:30-10:45am in Avery Hall 110
Thursday Lecture: 9:30-10:45am in Avery Hall 110
Thursday Lab: 11:00-12:15pm in Avery Hall 21

For detailed information on this course please see the course syllabus in html or pdf format.

Course Description

Embedded Systems are everywhere. Every time you look at your watch, answer the phone, take a picture, or turn on the TV you are interacting with an embedded system. Embedded systems are also found in cars, airplanes, and robots. They far outnumber traditional computers (which also contain embedded processors) and learning to design and program embedded systems is a critical skill that is necessary for many industry and scientific jobs.

In this course you will learn the basics of designing, interfacing, configuring, and programming embedded systems. We will make use of the Arduino platform, which is an inexpensive, popular embedded system used by hobbyists, researchers, and in industry, to implement the techniques learned in class. By the end of the course you will have mastered the basics of embedded system design and programming. This course will help to prepare you for cutting edge careers in industry and research.

Datasheets and other useful documents

Arduino Uno R3 schematic: The schematic of the Arduino we are using in this course.
Atmega328 datasheet: Datasheet for the processor on the Arduino Uno we are using in this course.

Assignments

See the course schedule below for reading assignments and the general topics covered in the course. Unless otherwise noted, assignments are due at the start of class on the due date.

Assignment	Due Date
Course Survey	Weds, Jan 27th, 5pm
HW 1 (pdf,code)	Start of class, Thurs, Feb 4th
Lab 1 (pdf)	Start of class, Thurs, Feb 11th
HW 2 (pdf)	Start of class, Thurs, Feb 18th
Lab 2 (pdf, lab2_button_count.ino, lab2_button_count.cpp)	Start of class, Thurs, Feb 25th
HW 3 (pdf,code)	Start of class, Thurs, Mar 4th
Test 1 from prior years: 2012, 2013, 2014, 2015, 2016, 2019	For review for test on Tuesday, Mar 9th in class
Lab 3 (pdf,Ultrasonic Sensor Datasheet,Servo Datasheet)	Thurs, Mar 11th (End of class)
HW 4 (pdf,code)	Start of class, Tues, Mar 16th
Project 1 (pdf) Project Report Template (Word Doc) Project Report Rubric (pdf) L298N Datasheet (pdf)	Bitbucket Repos: Thursday, Mar 18th (in Lab) Checkpoint 1 - "Robot Assembly/Schematic" Thursday, Mar 18th (in Lab) Checkpoint 2 - "Robot Motion", Tuesday, Mar 23rd (in morning Lab) B-Functionality - "Wall Following", Thursday, Mar 25th (in Lab) Competition, Thursday, Mar 25th (in Lab) Code and Written Report: Tuesday, Mar 30th, 2020 (beginning of class) Competition Times
Lab 4 (pdf, Lab 4 Code(Lab4_irq.ino or Lab4_irq.cpp)	Tuesday, Apr 6th (End of class)
HW 5 (pdf)	Start of class, Thurs, Apr 15th
Project 2 (pdf) Checkpoint 1 Code: (test.ino) Checkpoint 2 Code: (project2.ino, ir_decoder.cpp, ir_decoder.h) Project Report Template (Word Doc) Project Report Rubric (pdf) IR Sensor Datasheet (pdf1,pdf2)	Checkpoint 1 - "IR Decoding", Tuesday, Apr 13th (in Lab) Checkpoint 2 - "Robot Motion with IR Remote", Tuesday, Apr 20th (in Lab) A-Functionality - "Wall Following with Obstacle Avoidance, Thursday, Apr 29th (in Class and Lab) Competition, Thursday, Apr 29th (in Class and Lab) Written Report, Friday, Apr 30th by close of business (4:30pm) Competition Times
Test 2 from prior years: 2012, 2013, 2014, 2015, 2019	For review for test on Tuesday, Apr 27th in class
Lab 5 - Bonus Lab (pdf) Lab 5 Code(LCD_Starter_Code.cpp, pong.cpp, pong.h) Joystick Module Datasheet	Friday, Apr 30th (Close of Business)

For assignments that require electronic code submission, you can do so on Canvas
*Note html versions of assignments may lack some formatting or pictures found in the pdf version.

Recommended Course Books

Marilyn Wolf, Computers as Components, Fourth Edition: Principles of Embedded Computing System Design, 4th ed. Morgan Kaufmann, 2016
Available in the book store or purchase online. Readings from this book are specified in the format Wx.x, where x.x indicates the chapter and subsection.

David Russell, Introduction to Embedded Systems, 2010.
Available for free download when on the UNL campus. Good reference for embedded C programming. Do not print out this book, it is less expensive to order a printed copy than to print it yourself. Readings from this book are specified in the format Rx.x, where x.x indicates the chapter and subsection. Note: this book is specifically designed for the Arduino platform, but there are some differences between the version of the Arduino used in the book and the version we are using in class. So be careful!

Edward Lee and Sanjit Seshia, Introduction to Embedded Systems, A Cyber-Physical Systems Approach, 2011.
Available for free download. Do not print out this book, it is less expensive to order a printed copy than to print it yourself. There are no specific readings from this book, but it is a good reference for those interested in exploring some subjects further.

Brian W. Kernighan and Dennis M. Ritchie, C Programming Language (2nd Edition), 1988. ISBN: 0131103628
A wiki-style C "text book" alternative
Another online C text book
C Frequently Asked Questions from the days of Usenet
Suggested references for those with little prior C programming experience. There are no specific readings from these, but they are good references.

Lab Kit / Equipment List

Please purchase the items listed below. I recommend you check with the EE shop First (SEC 122), all equipment can be purchased online as well. If you look through the homeworks, labs, and projects we will be using many of the items in the following kits.

Arduino Uno Kit with buttons, wires, RGB LED, LEDs, Servo, photoresistors, IR receiver, etc. Here are a couple recommended kits:
- Elegoo Uno Kit: Cheaper kit with most of necessary parts.
- Arduino Uno Kit: Genuine Arduino starter kit with most of the necessary parts, but more expensive.
Robot Kit
- Elegoo Robot Kit: Cheap robot kit that uses AA batteries. The low current batteries seem to cause the robot motors to be inconsistent and not easily drive straight. Used a lot in Spring 2020.
- LAFVIN Robot Kit: Robot kit that uses rechareable (18650 3000mAh) batteries that will need to be purchased. This kit seems to drive the motors more consistently/reliably. Used by some in Fall 2020.
Logic Analyzer (recommended not required): If you choose to purchase a cheap logic analyzer you can use the PulseView open source software to run it. Otherwise you can use the logic analyzer in the SEC Labs.
- HiLetgo Logic Analyzer: USB Logic Analyzer.
- KeeYees Logic Analyzer: USB Logic Analyzer with mini grabbers.

Course Schedule

Below is an approximate schedule of course topics. These are subject to change, assignments will be announced in class. Readings are recommended and will be added as the semester progresses, so make sure to check back often; however, the best resource for this course is attending class and taking good notes. The course is roughly broken into regular class lectures on Tuesday and Thursday and then lab-style lectures on Thursday where a Labture is specified. Typically during labtures there will be a short topic-specific lecture followed by a hands-on, small group, in class lab assignment.

Week	Class Topics	Lab	Reading
Week 1, Jan 25	course intro, c programming		R2.1, R2.2, R2.4
Week 1 Additional Readings:	Basic C Types More on Basic C Types Bit Operations More Bit Operations Fixed width types Why use uint8_t C Pre-Processor and Macros How not to write code and the output (really, try compling it) Pointers Function Pointers Apollo Guidance Computer
Week 2, Feb 1	embedded system design, arduino intro, basic circuit diagrams		R2.5, R2.6, R2.7, R2.8, W1.1, W1.2, W1.3
Week 3, Feb 8	instruction sets, registers and mem access, digital I/O	Arduinos	W2.1, W2.2, R6.*
Week 2 and 3 Additional Readings:	Basic circuit elements How to read a schematic Arduino Uno R3 schematic How to read a datasheet Atmega328 datasheet Register-based digital I/O Another register-based digital I/O (just make sure to use bit operations (\|=,&=) and not binary value!) Arduino-function digital I/O AVR memory map overview (see datasheet as well) Directly accessing memory/registers with C macros (but for ARM, not AVR) Directly accessing memory in assembly Program counter (general info) Read up on the AVR Program Counter in the datasheet. Reading the program counter is not straight forward, but somtimes necessary.
Week 4, Feb 15	registers and memory, debugging		W3.1, R7.*
Week 5, Feb 22	debugging, timers	timers and I/O	R4.*
Week 4 and 5 Additional Readings:	Suggestions for debugging ES More debugging suggestions JTAG Another JTAG link Yet another JTAG link Viewing assembly output Arduino build process overview General info on timers AVR timers
Week 6, Mar 1	timers and PWM	PWM and servos	R8.*
Week 7, Mar 8	analog to digital converters (A2D) and review	begin Project 1	Test 1(tentative)
Week 6 and 7 Additional Readings:	Read section 16 in the datasheet on the Timer/Counter1 with PWM Details of Arduino millis fuction (and how it uses Timer0) Sparkfun PWM Arduino PWM (including analogWrite) Wikipedia PWM Fast versus Phase/Freq Correct PWM How servos work More on how servos work Wikipedia ADC Sparkfun ADC More ADC
Week 8, Mar 15	CPU bus, communication protocols (UART, SPI, RS485) Begin Project 1	A2D	W4.1, R10.1 to R10.1.3
Week 9, Mar 22		Project 1 Competition
Week 8 and 9 Additional Readings:	Parallel versus Serial, UART (sparkfun) Serial Communication (Wikipedia) Parallel Communication (Wikipedia) Serial Comms, UART, RS232, RS485 UART (Wikipedia) UART (sparkfun) More UART (but beware, code examples for a different processor) Interfacing a UART to USB-UART converter (TTL, RS232, USB, etc) SPI (sparkfun) SPI (wikipedia) SPI (arduino)
Week 10, Mar 29
Week 11, Apr 5		Begin Project 2
Week 12, Apr 12	interrupts	interrupts, communication	W3.1.4, W3.2, R9.*
Week 13, Apr 19	I2C, peripherals, sensors, Embedded Operating Systems, power management, embedded algorithms, program optimization, review	i2c	R10.1.2, W6.1, W6.2, W6.3, W5.5, W5.6, W5.7
Week 12 and 13 Additional Readings:	Interrupts More Interrupts Interrupts, very broadly (wikipedia) List of all interrupts on AVR AVR Libc Interrupt Reference AVR pitfalls of reentrant code I2C (warning code examples not for Arduino) I2C (sparkfun) I2C (wikipedia) I2C aka Wire Library (arduino)
Week 14, Apr 26		Project 2 Competition	Test 2

CSCE 236: Embedded Systems Spring 2021