What do we need to check while TESTING? Do we know what we are expecting? Few things which need to be taken care.

1. Considerations In verification of
Safety designs
Hanumath Managoli
Oak Systems Pvt Ltd.
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/ oaksys / Oak-systems / oaksystesting / oaksys

2. Agenda
 Overview of Oak Systems
 What to look for while TESTING
 Q&A
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3. Overview of Oak Systems
 Specialist Software V&V Services company
 Established in 1998
 ISO 9001 certified since 2003
 Over 100 Software specialists
 Multiple domain expertise
 Headquartered in Bengaluru; Projects across
several countries
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4. Our Portfolio 4
Domains
Aerospace &
Defence
Automotive
Embedded
Healthcare
Rail & Space
Services
Software
Verification &
Validation
Test Rig
Development
Software Testing &
Test Automation
Full lifecycle
Documentation
Support
Standards
DO-178B/C
ISO 26262
IEEE 12207
IEC 61508..

5. How People Absorb Tech 5
You must do the thing you think you cannot do

6. Embedded Systems – A few domains 6
 Automotive, Mobility
 Avionics, Aerospace, Military
 Industrial Automation, Plant
Control
 Medical Electronics
 Test, Measuring, Lab
Instrumentation
 Office Systems
 Home, Building Automation
 Banking/ATMs
 Media, Entertainment
 Telecom
 White goods / Home appliances
 ………
Just look around

7. Embedded Systems – It’s Serious Business… 7
Automotive, Mobility
Avionics, Aerospace,
Military
Industrial Automation, Plant
Control
Medical Electronics
Test, Measuring, Lab
Instrumentation
 Office
Home, Building Automation
 Banking/ATMs
 Media, Entertainment
 Telecom

8. Some of them are critical… 8

9. Test and Verify – The vital gate… 9
Requirements Design Implement Test / Verify

10. The typical system… 10
Sensors Processing Actuators
Environment

11. Software Configuration… 11
HARDWARE
O
P
S
Y
S
B/S
C
o
m
O
S
H A L / LLD
N/W COMMUNICATION
APPLICATION(s)
©
Diagnostics

12. 12What do we need to check???
Test for Requirements, functionality is obvious..
 Sensors and Actuators
 Electronics – other
 Electronics – Controller
 The Software

13. 13Do we know what we are expecting???
 Does the design ensure the correct initialization and
further processing of the system following restoration
after a fault?
 Is it ensured that failures of dynamic system activities
result in the system achieving a known and clearly
identified safe state within a specified time limit.

14. 14Few things to be taken care
 Scheduler
 Loop over-runs
 Diagnostics for…
 Sensors, Actuators
 Processor / Controller
 Dual/Multi-core, Illegal Opcode, Unused Mem
 Does ‘ADD’ really add?
 Software / Algorithm
 Diverse or redundant
 Sentinels

15. 15Few things to be taken care
 Error Handling and/or Recovery
 Response – Controlled or Rapid
 Forward/Backward Recovery
 The all important entity – Data
 Timings, including for communication
 Interrupts
 HAZOP, Risk and FMEA are as much an input for the VnV
group

16. 16Transitioning: Sure trouble spots

17. 17The “ERROR BUCKET”
EMPTY
Believe more on ‘BAD STORY’
Sizes of ‘FILL’, ‘EMPTY’ and ‘BUCKET’
depends on error & it’s impact
FILL

18. 18Testing…

19. 19
Yes, it helps!!!
Fr-L Fr-R Rr-L Rr-R
Test Case-1
Test Case-2
Test Case-3

20. 20Not to miss the process angle
 Life-cycle
 Functional Safety
 SIL
 Level of independence

21. 21
Questions & Answers
hymanagoli@oaksys.net

22. Thank you!
Oak Systems Pvt. Ltd.
#27, NGEF Lane, Off 100 Feet Road,
Indira Nagar, Bangalore – 560 038, INDIA
Tel : +91-80-41 26 76 81
Email: contact@oaksys.net
URL: www.oaksys.net
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