Re: [avrdude-dev] Re: Programmers errors on linux, help!

[E. Weddington]

"Theodore A. Roth" wrote:

> On Mon, 26 May 2003, Alex Shepherd wrote:
>
> :)> > Could this perhaps be due to power supply issues?
> :)>
> :)> I had try it in both configurations - with powering from parallel port,
> :)> and from external power supply - effect is the same.
> :)>
> :)> I can't understand the strange behavior of func usleep() - when I
> :)> set SLOW_TOGGLE=1 avrdude hangs on included calls to uslepp(). But this
> :)> function works correct in another places in par.c! What's going on ?
> :)> I don't know.
> :)
> :)I am having similar problems in that I am seeing verify errors sometimes
> :)(maybe 1-2 in 5) when I run on Win2k. However when I boot Linux on the same
> :)hardware, it runs fine. I tried a number of things at the time to see if it
> :)changed the behaviour but so far I cannot isolate the problem.
> :)
> :)On Linux the programming time is about 10-11 seconds and seems to work fine,
> :)but on Win2k it is only about 6 seconds and fails periodically, so it does
> :)start to smell like a problem with timing.
> :)
> :)I am also wondering about the usleep function as I think most of my failures
> :)are the first 2 bytes on a 64 byte block. I may have had some in other
> :)locations, but I am pretty sure they almost always 64 byte aligned.
>
> I wonder if using select() as a replacement for usleep() might be a possible
> solution. I seem to recall that select() is a bit more portable than
> usleep(). Something like this maybe:
>
> int
> usecsleep (int usecs)
> {
>     struct timeval tv;
>
>     tv.tv_sec = 0;
>     tv.tv_usec = usecs;
>
>     return select (0, NULL, NULL, NULL, &tv);
> }
>
> This was taken from "Linux Application Development" by Johnson and Troan.
>
> This also assumes that cygwin doesn't already implement usleep() in this
> way.
>
> Worth a try.
>

What I'd eventually like to do is to find a comparable Windows API function and
use that instead of any Cygwin-based function. My goal is to eventually move 
away
from Cygwin and build avrdude with MinGW.

Of course, when I can find the time to do this....... :-/

Eric