lec1-intro1 - Lecture 1 Introduction What is exactly an...

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Lecture 1: Introduction What is exactly an embedded system => Real-time system that interfaces with external hardware What then exactly is a real-time system => Computer system that interacts with external events Examples: Toaster, braking system, traffic light system (except in Montreal), soda machine, robot. Question: What about air conditioners, refrigerators, thermometers…? Types of Embedded systems – signal processing, mission critical, distributed Embedded real-time challenges: timeliness, predictability, event drivers, reliability, distribution, dynamics, concurrency, scalability, communication, synchronization, scheduling, visibility What is difference between an O/S and an RTOS? -an RTOS is an O/S -an O/S also interfaces H/W below with S/W applications above -an RTOS additionally allows user access to O/S low-level system services RTOS examples: PSOS, Lynos, ALX, QNX, VRTX, Linux, Unixware, Windows CE and NT, RTMX…but by far the world leader in RTOS development and usage: VxWorks by Wind River Systems. Two kinds of RTOS processes – periodic or sporadic
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