Thanks Dave,
It was a my fault. I'll change it on the SDK and on the article
as soon as possible.
Sergio
Dave Van den Eynde wrote:
>
>
> Hello,
>
> This week I accomplished something; I managed to hook up a HD47780 style
> LCD to the Fox Board. I did however notice that the program rssreader
> was using up all of the CPU because of its brutal 'delay' routines, so I
> went looking for a fix for this.
>
> I needed a function that would put the process to sleep for at least a
> given period of time and give up the CPU to play nice with other
> processes. I doesn't matter if that time is too long, the whole
> communication is synchronous anyway. I found some documentation on
> sleep(), nanosleep() and finally settled on using the select() function
> as the documentation that I found stated that it was the most portable
> way of doing it.
>
> I replaced the functions msDelay() and usDelay() with the following:
>
> void msDelay(int ms)
> {
> struct timeval tv;
>
> tv.tv_sec = 0;
> tv.tv_usec = ms * 1000;
>
> select(0, NULL, NULL, NULL, &tv);
> }
>
> void usDelay(int us)
> {
> struct timeval tv;
>
> tv.tv_sec = 0;
> tv.tv_usec = us;
>
> select(0, NULL, NULL, NULL, &tv);
> }
>
> I compiled and ran it for a while and found out system load dropped from
> >1 to 0.03. Perhaps this snippet of code is worthy of inclusion in the
> next version of the Fox SDK?
>
> Sincerely,
>
> Dave Van den Eynde
>
>
