AVR-Chat

On Feb 24, 2006, at 9:46 PM, kishor lalu bande wrote:

> i have written following programm
> for delay why it is not working.
> my clock speed is 4Mz and and want use it for LCD display delays
>
> void waitMS(unsigned long ulMS)
> {
>     CLI();          // disable all interrupts
>     ulTick = ulMS;
>     SEI();          // re-enable interrupts
>     while (ulTick>0);
> }

You don't show the definition of ulTick. It must be volatile.

As for timing I/O to LCD's, don't. Poll the LCD for its busy bit,  
while using a timer (such as your ulTick) to prevent an infinite loop  
if the LCD does not respond.

--
David Kelly N4HHE, dkelly@HiWAAY.net
========================================================================
Whom computers would destroy, they must first drive mad.