Of course it depends what you work on, I've been that path and come back again (although a while ago now). The reason is simple. 99% of everything I am currently working on has extreme size or power consumption requirements, but often has a fair degree of computational complexity. It would be real nice to bolt in an RTOS, and a few off the shelf parts, patch it together with a little C and spit out a product. The problem is I haven't yet found any combination that can do this fast enough, or compactly enough for my needs. I do test the compilers and other tools that come with development kits I buy, but haven't yet found one that could do what I need. When I do I'll buy it. In the mean time my products create their own market niche. The market for my two main products wouldn't exist if they were more expensive, bigger, or ran for less time between charges. All unachievable with COTs ttechniques. Al kennethwada wrote: > > heh... > > I used to do that! In fact, I was a big proponent of always doing the > 1st project with some 'XYZ-processor architecture' ENTIRELY in > assembler. With technological life-cycles now measured in months I no > longer have the luxury of doing this 'old-school' thing anymore. > > About the only thing I will do hard-core assembly on is the > highly-tweaked DSP/signal processing using FPGA cores, or specialized > DSPs anymore. Squeezing every extra MIPS is usually worth the hassle > of the extra effort and obtuseness of highly-crafted assembler in this > case. > > In fact, I used to pooh-pooh shrink-wrapped RTOS's! I was of the > following camp..."I can write my own RTOS, why...I only need that > infinite while(1) loop, and I am fine!". Now that I have spec'd in a > bunch of these shrink-wrapped RTOS's, and written drivers, and a bunch > of other stuff like this; I now find myself recommending > shrink-wrapped RTOS's, file-systems and communications servers too! > > The trick to successful deployment of this off-the-shelf technology is > to wrapper this stuff so most of the details are hidden to the > applications developers. All the apps-developers need to know is how > to write generic C/C++ code in a generic environment like DOS, Linux, > or Windows! > > Ken Wada > > --- In lpc2000@yahoogroups.com, Onestone <onestone@b...> wrote: > > Ah but the objective of learnig ARM ASM was to understand the fine > > details of the instruction set to write my own optimised code, not > to > > use C, or somebody elses generic optimisation. > > > > Al > > > > kennethwada wrote: > > > > > > > > The fastest way to use this is to do the following: > > > - Write a small piece of Keil "C" code > > > - Compile with the listing and Assemble source options checked > > > - look at dissassembled code with the "Arm Architeture Reference > > > Manual at your side" > > > > > > I did this, and managed to get some quality assembly language code > up > > > and operational in an hour or two! > > > > > > Most of my asm code is in the startup. With the Keil tools, there > > > really is very little, or no need to write your own assembler. > > > > > > Ken Wada > > > > > > --- In lpc2000@yahoogroups.com, Onestone <onestone@b...> wrote: > > > > And a lot of time. It's 811 pages long! few days read for a > decent > > > > novel, but a lifetime for a reference book! > > > > > > > > Al > > > > > > > > Ken Wada wrote: > > > > > > > > > RE:Learning ARM ASM > > > > > > > > > > Hello Chip; > > > > > You need the "Arm Archtitecture Reference Manual" > > > > > > > > > > Ken Wada > > > > > > > > > > Yahoo! Groups Sponsor > > > > > ADVERTISEMENT > > > > > <http://us.ard.yahoo.com/SIG=129qe2qbj/M=298184.6191685. > 7192823. > > > 3001176/D=groups/S=1706554205: > > > HM/EXP=1112112871/A=2593423/R=0/SIG=11el9gslf/*http://www.netflix. > > > com/Default?mqso=60190075> > > > > > > > > > > > > > > > > > > > > > > > > ---------------------------------------------------------------------- > > > -- > > > > > Yahoo! Groups Links > > > > > > > > > > * To visit your group on the web, go to: > > > > > http://groups.yahoo.com/group/lpc2000/ > > > > > > > > > > * To unsubscribe from this group, send an email to: > > > > > lpc2000-unsubscribe@yahoogroups.com > > > > > <mailto:lpc2000-unsubscribe@yahoogroups.com? > > > subject=Unsubscribe> > > > > > > > > > > * Your use of Yahoo! Groups is subject to the Yahoo! Terms > of > > > > > Service <http://docs.yahoo.com/info/terms/>. > > > > > > > > > > > > > > > > > > >--------------------------------------------------------------------- > > > --- > > > > > > > > > >No virus found in this incoming message. > > > > >Checked by AVG Anti-Virus. > > > > >Version: 7.0.308 / Virus Database: 266.8.4 - Release Date: > > > 27/03/2005 > > > > > > > > > > > > > > > > > > > > > > > > > Yahoo! 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Terms of > > > Service <http://docs.yahoo.com/info/terms/>. > > > > > > > > > >--------------------------------------------------------------------- > --- > > > > > >No virus found in this incoming message. > > >Checked by AVG Anti-Virus. > > >Version: 7.0.308 / Virus Database: 266.8.4 - Release Date: > 27/03/2005 > > > > > > > > > > > Yahoo! Groups Sponsor > ADVERTISEMENT > <http://us.ard.yahoo.com/SIG=1292ne6g0/M=298184.6018725.7038619.3001176/D=groups/S=1706554205:HM/EXP=1112143341/A=2593423/R=0/SIG=11el9gslf/*http://www.netflix.com/Default?mqso=60190075> > > > > ------------------------------------------------------------------------ > Yahoo! Groups Links > > * To visit your group on the web, go to: > http://groups.yahoo.com/group/lpc2000/ > > * To unsubscribe from this group, send an email to: > lpc2000-unsubscribe@yahoogroups.com > <mailto:lpc2000-unsubscribe@yahoogroups.com?subject=Unsubscribe> > > * Your use of Yahoo! Groups is subject to the Yahoo! Terms of > Service <http://docs.yahoo.com/info/terms/>. > > >------------------------------------------------------------------------ > >No virus found in this incoming message. >Checked by AVG Anti-Virus. >Version: 7.0.308 / Virus Database: 266.8.4 - Release Date: 27/03/2005 > >
Message
Re: [lpc2000] Re: Learning ARM ASM
2005-03-29 by Onestone