--- In "thoff88" <> wrote:
>
> --- In Jim Jackson <jj@> wrote:
> >
> > On Mon, 21 Nov 2011, thoff88 wrote:
> >
> > > I am fairly new to the ts7250 and I'm trying to control the DIO pins.
> > > When I toggle the pins in a for loop nothing happens unless there is a
> > > printf() statement within the loop. I am using rtai functions so I can
> > > use the real time timer between the loop iterations, yet the pins still
> > > only toggle when there is a printf() statement in the loop.
> > >
> > > If anyone has suggestions to what may be causing this it would be very
> > > appreciated.
> >
> > Without code it's like being mystic meg :-)
> > But probably because you haven't declared your pointers as volatile.
> > Or not using the correct options in mmap? e.g.
> >
> Thank you for the quick response. Here is the code I am using. It only
> outputs a 100 Hz square wave when I use the printf() statement.
>
> void pwm() {
> int i = 0;
> volatile unsigned long *start;
> volatile unsigned long *PBDR, *PBDDR;
> int fd = open("/dev/mem", O_RDWR);
Search the archives or man pages for another helpful option here ...
Sorry, no silver platters here ... now get off my lawn :)
------------------------------------
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/ts-7000/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/ts-7000/join
(Yahoo! ID required)
<*> To change settings via email:
<*> To unsubscribe from this group, send an email to:
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|