Sustav za ispitivanje odziva na vanjski događaj za operacijske sustave namijenjene ugradbenim računalima

master's thesis

• Title (english): External Event Response Time Measurement System for Operating Systems Used in Embedded Devices
• Author: Roko Lisica
• Mentor: Leonardo Jelenković (mentor)
• Committee member: Leonardo Jelenković (predsjednik povjerenstva)
• Committee member: Dejan Škvorc (član povjerenstva)
• Committee member: Marin Golub (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2018-07-09, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing

Abstract

Operacijski sustav Linux je popularan za primjenu na ugradbenim računalima, ali se dugo nije smatrao dovoljno pouzdanim za rad u stvarnom vremenu. Novije verzije su napravile veliki napredak u tom području. U ovom radu je ispitano u kolikoj mjeri je Linux sada spreman za rad u stvarnom vremenu, koji faktori utječu na njegova vremenska svojstva te kakva su ona u usporedbi s operacijskim sustavom FreeRTOS.
Mjerena veličina je kašnjenje između rastućeg ili padajućeg brida na ulaznom GPIO pinu i istog brida na izlaznom pinu. Kašnjenje se mjerilo na posebno razvijenom mjernom sustavu koji se sastoji od dva STM mikroupravljača.
Rezultati pokazuju da je Linux na Raspberry Pi sklopovskoj platformi dovoljno dobar za blage sustave za rad u stvarnom vremenu, ako se kod na njemu izvodi u jezgrenom načinu rada.

Abstract (english)

The Linux operating system is popular for embedded computing, but, for a long time, was not considered reliable enough for real-time applications. More recent versions demonstrate a major improvement in this regard. Within this thesis, testing was performed to determine to what extent is Linux ready for real-time applications, which factors affect its time characteristics and how they compare with FreeRTOS.
Measured quantity is the delay between a rising or a falling edge on an input GPIO pin and the same edge on an output pin. The delay was measured using a specially developed measurement system consisting of two STM microcontrollers.
The results demonstrate that Linux run on a Raspberry Pi hardware platform is good enough for soft real-time applications, if the code on it is run in kernel mode.

• Keywords: Raspberry Pi; Linux; FreeRTOS; rad u stvarnom vremenu; odziv; kašnjenje; jezgra; operacijski sustav; ugradbeni sustavi
• Keywords (english): Raspberry Pi; Linux; FreeRTOS; real-time; response; delay; kernel; operating system; embedded systems
• Language: croatian
• URN:NBN: urn:nbn:hr:168:628587
• Study programme: Title: Computing; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka računarstva (magistar/magistra inženjer/inženjerka računarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-03-13 22:19:24