>> Linux runs on at least a dozen h/w platforms. AFAIK, no device driver >> directly includes assembler, and if they do, they are unlikely to be >> part of the mainstream kernel. They certainly wouldn't be part of >> ALSA, I would hope. >> > >a part of assembly-howto :)
[ ... example elided ... ] >Small, huh? :) frankly, who cares? the code you provided (1) doesn't do anything and (2) wouldn't run on a Linux host using a PPC, Alpha, ARM or SPARC processor. >I'm writting programs for microcontrollers in assmbler - te final code >fits in about 2000 lines and takes about 2kB... I know how much would it >take, if I wrote it in C or BASIC... it would probably be almost exactly the same unless you were either a very bad C programmer or an exceptionally good (and obscure) assembler programmer. >I know how it looks from "very hardware" side / experience. >C uses libc and some others... that takes time, so i think it's slower. thats simply not true. C does not use libc unless *you* use it. >use C... but I thought that asm would be simplier/faster. very, very much more complex. and very likely not much faster. besides, you seem to be completely forgetting the fact that very often the instructions executed from *your* code are only a very small fraction of the total executed by the kernel for any given operation. >I would have to call function, make everything i want and finish, before >aprox. 22usec... would it be enough? depends on what you want to do. a function call typically adds between 6 and 12 instructions, even less if you use -fomit-frame-pointer, so its hardly the problem. if you really believe that choosing C or assembler will alter such things by amounts that matter, you've either got way more experience with computers than i have, or way less :) >In uC I had timers, by which i could call an interput after demanded >time. >Is there something like this under linux? yes, but they don't have the resolution you would need. the fastest system timer has a frequency of HZ, which is normally 100 in most x86 systems. there are ways to use the RTC to get higher timing, but they are kludgy, involve a slightly longer code path, and require a patch to the kernel. --p _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
