2010/8/19 Mike Frysinger <[email protected]>: > On Thursday, August 19, 2010 12:15:45 Frans Meulenbroeks wrote: >> Hm. I thought about open/close too. Triggered by your comments I wrote >> a small test app. >> If I use fopen/fclose and in a while loop do: >> fputc('0', fp); >> fputc('1', fp); >> I get a wave with period 1.96 uS. >> If I move to open/close with a while loop like: >> write(fd, "0", 1); >> write(fd, "1", 1); >> the period reduces to 1.53 uS. >> Same hw (1.2 ghz ppc) > > but what is the difference in your jtag transfers ?
I've no idea, I just crafted a small test program that toggles the gpio flag. I didn't get to converting the whole gpio module >> BTW: i tried open with and without O_DIRECT but that did not seem to >> make any difference. > > O_DIRECT is meaningless to pseudo file systems like sysfs Yeah, figured that, but to be sure I tried it anyway. Frans ------------------------------------------------------------------------------ This SF.net email is sponsored by Make an app they can't live without Enter the BlackBerry Developer Challenge http://p.sf.net/sfu/RIM-dev2dev _______________________________________________ UrJTAG-development mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/urjtag-development
