Lpc2000

I'll try it, thank you

--- In lpc2000@yahoogroups.com, Robert Adsett <subscriptions@...> wrote:
>
> At 01:12 PM 3/26/2006 +0000, grodo2k wrote:
> >Hello
> >I have a problem; the folowing code, allow to trigger an interrupt via
> >UART0 but when the interrupt occurs one time it doesn't end. When I
> >send a char from PC to the LPC I receive 'A' non stop. Can someone say
> >me, why?
> >
> >When I use the line: U0IIR_copy = U0IIR;, it ackts same.
> >The code:
> >
> >void UART0INT() __irq
> >{
> >         if(toggle)
> >         {
> >                 IO0CLR |= 0x20000;  //clr P0.17
> >                 toggle = 0;
> >         }
> >         else
> >         {
> >                 IO0SET |= 0x20000;  //set P0.17
> >                 toggle = 1;
> >         }
> >         send_char_u0('A');
> >         //exit ISR
> >     //U0IIR_copy = U0IIR;
> >         VICVectAddr = 0x00000000; //dummy write
> >}
> 
> Read the section in the user manual on the IIR.  Different interrupts 
> sources require different acknowledgements.  In particular the
receive data 
> interrupt requires that data be read to acknowledge the interrupt. 
Since 
> you never read the data the interrupt is never acknowledged.
> 
> You also need to enable the FIFO, although you are unlikely to see the 
> effect of that until everything else is at least mostly working.
> 
> Robert
> 
> " 'Freedom' has no meaning of itself.  There are always
restrictions,   be 
> they legal, genetic, or physical.  If you don't believe me, try to
chew a 
> radio signal. "  -- Kelvin Throop, III
> http://www.aeolusdevelopment.com/
>