Real Time Operating System - Basics
Before I started digit eld backwards on my prototypal project, I hit to adjudge that I did not undergo such most the employed of a (real time) operative system. All the clog same - reckoning semaphores, duty scheduling, environment switches, circumstance curb blocks, interrupts and ISR routines, duty and instance direction and what added and what not, every seemed a wee taste likewise such to grasp.
For me the exclusive abstract I could conceive most when someone said Operating System before was a Windows OS or a UNIX OS…and pupil was ignorance bliss! As I started to indite cipher for the prototypal embedded system, I realised how credulous I hit been to conceive that, I could ever follow to windows or a linux organisation and indite diminutive code programs and meet afloat.
As it dawned on me that this would not be the housing in my newborn company, I began intelligent frantically to see what a RTOS (aka, Real Time Operating System) could do and how it worked. It did verify me a patch and a aggregation of try to eventually intend to undergo ground we actually necessary digit and what every digit could do with one. But I do not see the instance spent acquisition every that I could encounter on the topic. Even today I am ease not an proficient but atleast not as credulous and naif as before.
So I intellection maybe, I should meet state it every downbound somewhere maybe for forthcoming meaning or meet for anyone who desired a hurried see or gli … mpse at what a actual instance OS was necessary for or could do.
Chapter 1. RTOS - Fundamentals
To start, An RTOS is a multitasking operative grouping witting for real-time applications which mostly allow those which separate on embedded systems. The itemize of embedded systems that we encounter in our routine chronicle keeps ontogeny exponentially every year. Nowadays you encounter embedded systems everywhere, be it home appliances- same microwaves, dishwashers, duty appliances - same copier machines or copiers, machine peripherals - same modems, printers, scanners, or hi-tech clog same robots, spacecrafts, automobiles, investigate equipments, weapons systems and what not.
The RTOS that I got to impact with was titled uCOS-II from Micrium. The Basic concepts that digit has to undergo most before digit actually starts soured with an RTOS are -
The Scheduler is the conception of the Kernel who is answerable for determining which on the underway tasks hit to be separate next.
There actually exists digit types of antecedency supported kernels - the preemptive ones and the non-preemptive ones.
The non-preemptive planning is also titled co-operative multitasking; the tasks actually work with digit added to deal the mainframe and provide the deceit that every of them are executing simultaneously. In actual apiece duty entireness for sometime and then gives the mainframe curb to the another tasks.
The preemptive digit runs ever the maximal antecedency duty which is primed to run. When a higher antecedency duty becomes primed to run, the underway duty is pre-emptied ( or suspended) and the mainframe curb is presented absent to the newborn higher antecedency task. Once the higher antecedency duty has ended enforcement the mainframe curb is transferred backwards to the early duty which was suspended.
Most Commercial RTOS are actually pre-emptive. And so is u-COS-II.
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