Embedded. What Why How
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The document discusses the field of embedded systems, including various hardware and software components, programming environments, and application areas such as IoT and automation. It highlights the importance of debugging and quality assurance in embedded development, providing various tools and methodologies. The author, Volodymyr Shymanskyy, emphasizes the unique challenges of developing embedded systems as opposed to general-purpose applications.
![Support
Old long-term projects (10-15 years!!!)
And so are developers and their habits
[sometimes]](https://image.slidesharecdn.com/embedded-150623104621-lva1-app6891/85/Embedded-What-Why-How-35-320.jpg)
Embedded. What Why How
- 1. Embedded What? Why? How? Volodymyr Shymanskyy June 2015 You can find animated version here: http://tiny.cc/emb-wtf
- 2. Embedder
- 3. Integrated Low Level System Dev Platform Dev Firmware Embedded RTOS, RISC uC, µC, MCU, SoC Microcontrollers FPGA, DSP, ASIC JTAG STM32, Cortex, ARM, AVR, PIC, MIPS, PowerPC, SPARC, Arduino, Xilinx VxWorks Linux Driver Kernel Ring-0
- 4. WHY?
- 6. Embedded Integrated Low Power Small Size Low Cost Durable … or Beautiful
- 9. Applications Automation (industrial, home...), IOT Mobile, Modems, VOIP Telecom, Network, Broadband Automotive Equipment (medical, military, consumer, cooking…)
- 11. Blynk 493% funded on Kickstarter!
- 12. Operating environment becomes application-specific (contrary to general-purpose)
- 14. Frameworks Even C++ features are turned off! ^_^ But there are some: Linux, mbed, QP… Libraries ARE used. LibEvent, minizip, etc...
- 15. C, C++, Java, … ? User Apps Mobile Web Text proc. Prototyping Basic / Pascal Forget it ;) C/C++ Java, .Net Python WOW!!! Perl WOW!!! JS, Node.JS WOW!!! awk, sed WOW!!! Bash / Cmd Just system scripting
- 16. Library Processor(s) Memory Devices Kernel Drivers Supervisor Application Hardware Library Lib Library L Program Program Program Program System Software Framework
- 17. Platforms
- 18. CISC vs RISC vs MISC vs ZISC ● Complex ● Reduced ● Minimal ● Zero!
- 19. x86 GPU DSP FPGA uC Embed Power Float arithm Integer arithm Flow control IO Pipelining Timing Programming From FPGA 101 Platform types
- 20. Tools
- 21. LAB
- 22. Tools Debugging Emulators, Traces, Statistics, Diagnostic.... Hardware Monitors, Scopes, Sniffers.... Quality Assurance is also more interesting!
- 23. Debuggers Conditional breakpoints Data breakpoints Watch expressions Reverse, Rec-Replay Remote debugging Offline debugging Debugging in emulator! Data Display Debugger
- 24. Profilers
- 25. Profilers ● speed, resource usage, cache Perl perl -d:NYTProf myscript.pl Python python -m cProfile myscript.py +pycallgraph Java NetBeans, GC Viewer, here (rus) You can do measurements directly in code!
- 27. fun sysstat (sar) iostat pidstat mpstat etherape, vnstat powertop socat, netem, strace, ltrace
- 29. Protocol Sniffers / Analysers Wireshark Fiddler Hardware USB
- 30. Prototyping ● Python, JS, Node.js ● Arduino ● Online: ○ Coding Ground ○ JSFiddle
- 32. Logs, Dumps, Event Traces ● “Debug by prints” ○ Embedded / multithreaded ● Log to file, to ram (may be shared) ○ Filter by module/severity ● Dump part of the state ○ Stats ● Event Traces ○ Binary, lightweight
- 33. Statistics ● Event counts ○ In domain, or internal ○ Amount of function calls ● Time of processing ● Latency ● CPU/RAM usage
- 34. CLI - Command Line ● Interactive ● One-shot Increases usability & Allows automation!
- 35. Support Old long-term projects (10-15 years!!!) And so are developers and their habits [sometimes]
- 36. Requirements C/C++ OOP/OOD Multithreading, Synchronization, RPC, IPC Linux/Unix Embedded/Low Level Network stack, OSI model POSIX, STL
- 37. Other Requirements Complex systems design Debugging on customer side Logical thinking English
- 38. Benefits?
- 40. RC Car -> Robot
- 41. 3D Printers
- 42. Volodymyr Shymanskyy Embedded Software Developer & Trainer Hackerspace Co-Founder & Coordinator vshymanskyi@gmail.com skype: vshymanskyi LinkedIn, Facebook Submit your ideas and corrections for this presentation