1. EMBEDDED SYSTEM SOFTWARE AND RTOS BASICS DIAGRAMS
Embedded Systems Software Training Center
EMBEDDED SYSTEM SOFTWARE AND RTOS BASICS DIAGRAMS

2. Diversity of the Embedded Systems
The range of embedded systems is extremely diverse both in terms of its scale and nature.
There is currently no effective way of classifying the various systems.
Embedded device total cost
* It is also necessary to add in a time-to-market factor.
！Today development costs have become a significant factor in mass-production.
Controls rice cookers to nuclear power plants

3. Case Example: Embedded system used in car
Provided by Toyota Motor Corporation

4. Software embedded in an equipment and in LSI
DSP – Digital Signal Processor
LSI – Large Scale Integration

5. Embedded software size and deployment
Sales of embedded s/w is congruous with sales of large s/w systems, like MS Windows

6. The size of the respondents (the number of employees)
Compare this data with your company.

7. The size of the respondents (sales)
Compare this data with your company.

8. Breakdown of the total development cost in the operating department
The cost of software development accounts for 40% of total development costs.

9. Types of targeted processors
The 32 bits era

10. Programming languages
Mainstream is C language

11. Targeted OS
ITRON has the largest sector

12. Processing Order: Cooperative vs. Preemptive
Cooperative Multitasking
Preemptive Multitasking
Process A OS
Process A (low priority, cyclic)
Process B1
Process B2
Process B (low priority)
Process C
Process C (high priority, cyclic)
Process D
Process D (high priority)
Processes (tasks) are run in an infinite loop
If task takes too much time (B), need to divide it
No overhead occurs
Scheduling is performed by the OS
Long task is suspended if needed
Overhead: caused by OS internals
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13. References Embedded systems: Scheduling: Synchronization
Christof Ebert, Jurgen Salecker, “Embedded Software-Technologies and Trends”
Steve Heath, “Embedded Systems Design - 2ed”
Michael Barr; Anthony J. Massa, “Programming embedded systems: with C and GNU development tools”
Scheduling:
Synchronization
On-line library
QNX architecture
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