Lpc2000

Hi guys, just a thought, try this instead

volatile unsigned long DC1 = 90;

void IRQfunction(void)
{
   DC1 = 20;

}

regards,
Charles

--- In lpc2000@yahoogroups.com, "ed_hage" <ed_hage@y...> wrote:
> 
> Latest update:
> 
> When I reassign a value to DC1 in the function it works, example:
> 
> int DC1 = 90;
> 
> void IRQfunction (void)
> {
>   DC1 = 20;
>   PWM_MR4 = (PWM_MR0 * DC1) / 100; 
>   ... etc
> 
> Now I get a 20% DC, but when I comment out DC1 =20; I should get a 90%
> DC (as specified before) but then I get a constant high output!!
> How can I get the global to work?
> 
> (P.S. I also posted this question on the gnuarm group because I
> suspect this may not be a typical LPC problem but maybe a gnu-issue)
>  
> > That's the point. I have it already running hard coded! I have a
> > simular setup in a PWM_Init () function and I get great 5% DC on my
> > output-pin  when I have the following:
> > 
> > PWM_MR4 = (PWM_MR0 * 5) / 100; 
> > 
> > Also tried (DC1 defined in the function):
> > int DC1 = 5;
> > PWM_MR4 = (PWM_MR0 * DC1) / 100; 
> > 
> > and that works, but what I want and does not work is defining DC1 as a
> > global (outside the function) so I can change it with other functions.
> > How can I solve this problem 
> > 
> > (we have evolved to a problem that has nothing to do with floats
> > anymore ;-} )