From: "Rego, P." <pvrego@gmail.com>
Subject: Re: Chicken or the egg. New targets & runtimes
Date: Mon, 21 May 2012 12:51:30 -0700 (PDT)
Date: 2012-05-21T12:51:30-07:00 [thread overview]
Message-ID: <c17d1e1c-5091-420a-9041-53c5a2a1fa0a@googlegroups.com> (raw)
In-Reply-To: <20120516212910.479ca67866ddfe8d25634cdb@iki.fi>
> For example, if you have 4 tasks and divide memory equally, each task
> gets only about 512 bytes (2KB total / 4 = 512b and you need to
> reserve a little for the scheduler also). In addition, task switching
> overheard might become quite big, since you need to save quite many
> registers in every switch and processor CPU frequency is limited to
> 20MHz at maximum.
Well, 512B is exactly the amount of SRAM an AVR Minumus (AT90USB162 - 512B SRAM, 16KB Flash and 16MHz) has available, so it's not so few. I have one, and it's quite good for simple control/robotic applications even using as CDC (much more as standalone). With this 4-tasking scheme, we would simply have the equivalent to 4 AT90USB162 running in parallel, but a bit faster, since ATmega328P is 20MHz, and with more h/w resources. Also the 32KB Flash from the ATmega328p would be enough to allocate all the code for the tasks.
> But, I agree that (implementing) the tasking would be interesting,
> whether or not it being useful. :)
Yes, but I believe it will be useful :-)
prev parent reply other threads:[~2012-05-21 19:52 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-15 14:05 Chicken or the egg. New targets & runtimes Patrick
2012-05-15 14:28 ` Dmitry A. Kazakov
2012-05-15 15:04 ` Lucretia
2012-05-15 19:44 ` Rego, P.
2012-05-15 20:24 ` mjsilva
2012-05-15 22:59 ` Britt
2012-05-16 16:39 ` Rego, P.
2012-05-16 18:29 ` Tero Koskinen
2012-05-21 19:51 ` Rego, P. [this message]
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