From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=unavailable autolearn_force=no version=3.4.4 X-Received: by 10.224.129.196 with SMTP id p4mr32583276qas.6.1372803666635; Tue, 02 Jul 2013 15:21:06 -0700 (PDT) X-Received: by 10.50.67.74 with SMTP id l10mr1175204igt.0.1372803666409; Tue, 02 Jul 2013 15:21:06 -0700 (PDT) Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!news.eternal-september.org!mx05.eternal-september.org!feeder.eternal-september.org!news.bbs-scene.org!border4.nntp.dca.giganews.com!border2.nntp.dca.giganews.com!nntp.giganews.com!y2no159173qax.0!news-out.google.com!f7ni623qai.0!nntp.google.com!y2no166767qax.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail Newsgroups: comp.lang.ada Date: Tue, 2 Jul 2013 15:21:06 -0700 (PDT) In-Reply-To: Complaints-To: groups-abuse@google.com Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=108.90.156.221; posting-account=qZVz2QoAAAAN9WxYp-9jYb7jORc4Zqwt NNTP-Posting-Host: 108.90.156.221 References: <31f9819e-6509-4d67-acea-4d2ba9a96c04@googlegroups.com> <4csim6j63mk4.1c54vo5v7eu8c.dlg@40tude.net> <51d280e7$0$6556$9b4e6d93@newsspool4.arcor-online.net> User-Agent: G2/1.0 MIME-Version: 1.0 Message-ID: Subject: Re: Help with embedded hardware/software platform selection for ADA From: mjsilva@scriptoriumdesigns.com Injection-Date: Tue, 02 Jul 2013 22:21:06 +0000 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Xref: news.eternal-september.org comp.lang.ada:16066 Date: 2013-07-02T15:21:06-07:00 List-Id: On Tuesday, July 2, 2013 10:27:08 AM UTC-7, Dmitry A. Kazakov wrote: =20 > ...Otherwise there is no problem to have a 100us control loop under a "no= rmal" >=20 > OS like Linux or VxWorks. Even under Windows you can have stable 5ms >=20 > (Windows has timer resolution issues, performance is basically OK). >=20 I'm still trying to convey that what both Simon and I are talking about are= boards 10-100 times less expensive than ones that can run those OSes, usin= g micros that cost as little as a dollar or two. The fat part of the pyram= id, as I said earlier. Here are two examples off the top of my head (both = found in many commercial products, not just hobby projects): (a) Electronic speed controls (ESCs). They drive brushless DC motors at ma= ny thousands of RPM, adjusting the 3-phase PWM and reading back-EMF during = coasting periods. Rather average specs would be a 50us PWM window, includi= ng an ADC read, all using a micro that costs well under $1. (b) RGB LED control. Controllable RGB LEDs require data at a rate of 800kb= ps over a single clock/data line, daisy chained up to 1000 LEDs per control= ler. Again, using a micro in the 1-2 dollar range. I could add to this list of examples indefinitely, without coming anywhere = near your Windows/Linux/VxWorks world.