Real-Time Embedded Systems Concepts and Practices

Real-Time Embedded Systems Concepts and Practices

This course is part of Real-Time Embedded Systems Specialization

Instructor: Sam Siewert

What you'll learn

A beginning practitioner's understanding of rate monotonic theory, analysis, and practices for embedded systeems.
Implementation of real-time services as POSIX threads.
Difference between Linux user space and kernel space.

Skills you'll gain

Details to know

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Assessments

11 assignments

Taught in English

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This course is part of the Real-Time Embedded Systems Specialization

When you enroll in this course, you'll also be enrolled in this Specialization.

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There are 4 modules in this course

This course can also be taken for academic credit as ECEA 5315, part of CU Boulder’s Master of Science in Electrical Engineering degree.

Course Description: In this course, students will design and build a microprocessor-based embedded system application using a real-time operating system or RT POSIX extensions with Embedded Linux. The course focus is on the process as well as fundamentals of integrating microprocessor-based embedded system elements for digital command and control of typical embedded hardware systems. Lab Description: The course requires the student to install embedded Linux on the Raspberry Pi ARM A-Series System-on-Chip processor. This course must be completed using a Raspberry Pi as an embedded system (headless) not a PC running Linux. You will however find Linux as a useful host development system or Windows with an SSH terminal access tool such as Putty, MobaXterm, or equivalent.

This module gives an introduction to real-time theory , challenges faced in designing real-time systems and scheduling policies implemented while comparing the Linux POSIX real-time threads to RTOS and MFE systems.

What's included

8 videos6 readings4 assignments2 programming assignments1 peer review1 discussion prompt

8 videosTotal 198 minutes

Course Introduction13 minutesPreview module
Predictable response software36 minutes
Simple Linux real-time services compared to non-real-time - introduction18 minutes
Simple Linux real-time services compared to non-real-time - conclusion36 minutes
Introduction to Scheduling Theory for Real-Time Systems30 minutes
RM Optimal Priority Policy and Service Request and Response Timeline9 minutes
Timing Analysis - Rate Monotonic Priority Assignment Policy By Example7 minutes
Challenges with Linux User and Kernel Space Real-Time Applications45 minutes

6 readingsTotal 60 minutes

EXTRA HELP: Home Lab Set Up10 minutes
EXTRA HELP: Code Walkthroughs and Demonstrations10 minutes
Scan and Question RTES Terminology10 minutes
EXTRA HELP: Code Walkthroughs and Demonstrations10 minutes
EXTRA HELP: Code Walkthroughs and Demonstrations10 minutes
Re-Read, Recite, and Review RTES Terminology we Used10 minutes

4 assignmentsTotal 60 minutes

Scheduling policies15 minutes
Services15 minutes
Module 1 | POSIX Threads and Linux Systems15 minutes
Basic Concepts and Terminology15 minutes

2 programming assignmentsTotal 360 minutes

Assignment 1 : Hello World ! - Simple thread Creation180 minutes
Assignment-2 :Multiple Threads180 minutes

1 peer reviewTotal 60 minutes

Basic and Multi-Threaded Code Review60 minutes

1 discussion promptTotal 10 minutes

Introduce Yourself10 minutes

This module describes the utility curves used for analysis of real-time systems along with Rate Monotonic Scheduling Policy and its Least Upper Bound Condition. It also describes the absolute time and date standards which are critical parameters for real-time services.

What's included

7 videos3 readings3 assignments1 programming assignment2 peer reviews

7 videosTotal 124 minutes

Code Demonstration: SMP compared to AMP5 minutesPreview module
Code Walkthrough: Starter code for AMP using thread affinity7 minutes
Real-Time Scheduling Utility Curves18 minutes
Code Walkthrough: RT Clock14 minutes
Review of absolute time and date standards and resources35 minutes
Rate Monotonic Scheduling Analysis by Worst Case Inspection15 minutes
Rate Monotonic Scheduling - Feasibility vs. Safety and Exceeding the RM LUB27 minutes

3 readingsTotal 320 minutes

Scan and Question Original paper on Rate Monotonic theory (Liu & Layland)180 minutes
Optional reading on Linux NPTL and SCHED_DEADLINE120 minutes
Re-Read, Recite, and Review RTES Terminology we Used20 minutes

3 assignmentsTotal 90 minutes

Real time Utility curves30 minutes
Rate Monotonic Scheduling 30 minutes
Module 2 | Real-Time Systems Analysis, Harmonic Services and RMA Scheduling Policy30 minutes

1 programming assignmentTotal 180 minutes

Assignment 3 : Implementing Linux real-time threads180 minutes

2 peer reviewsTotal 120 minutes

Assignment 3 : Implementing Linux real-time threads60 minutes
CPU Core Affinity and RT Clock Code Review60 minutes

This module covers the methods of sequencing of service requests along with software scheduling and real-time scheduling policies.

What's included

13 videos1 reading2 assignments2 peer reviews

13 videosTotal 187 minutes

Priority Preemptive Scheduler State Machine For Linux and VxWorks22 minutesPreview module
Service Code Structure driven by Interrupts14 minutes
Summary of Key Points and Liu & Layland RMA Uses and Limitations30 minutes
More Details on Liu and Layland RMA Limitations and Work-arounds27 minutes
Code Walkthrough: POSIX Software Interval Timer Example8 minutes
Code Walkthrough: Generic Sequencing using an Interval Timer10 minutes
Comparison of Cyclic Executive, RTOS and Linux RT Service Implementation29 minutes
Introduction to Worst Case Analysis hand diagramming of RM schedules9 minutes
Worst Case Analysis schedule where RM fails (above the LUB)5 minutes
Example where RM succeeds above the LUB for a harmonic service set6 minutes
Example of scheduling above the LUB at 100% utility that is feasible6 minutes
Analysis of a harmonic service schedule by hand diagramming for RM and RR7 minutes
Introduction to Cheddar RMA Tool8 minutes

1 readingTotal 10 minutes

Re-Read, Recite, and Review RTES Terminology we Used10 minutes

2 assignmentsTotal 30 minutes

Real-Time Scheduling and Service Requests15 minutes
Module 3 | Review and Basic Timing Analysis by Hand and with Cheddar15 minutes

2 peer reviewsTotal 390 minutes

Practice Using Generic Sequencer to Create Scenario240 minutes
Using Cheddar to Check Hand Analysis of Schedules150 minutes

This module discusses the use of multi core microprocessors for real-time applications and gives an overview of RTOS Options (Open and Proprietary) and OS with POSIX Real-Time Extensions for real-time systems.