Posted on July 10, 2004 at 06:22I have a lite timer 1 interrupt to control pulse width. But after several pulse are produced the interrupt is disabled unexpected. If I add ''_asm(''nop'')'' or any other codes to ISR this is not going to happen. Why would _asm(''nop'') affect my routine ?
My ISR codes:
{
iSoftMCount++;
if(iSoftMCount>=3000) // Overflow
{
StaticFlag = 1;
ucHallFlag = 0;
LITE1_disableINT;
iSoftMCount = 0;
}
LTCSR1 &= 0xf7;
_asm(''nop'');
}
Some judgement in MAIN:
LITE1_disableINT; // Disable INT when compare
if(iSoftMCount>=iStopCount) // Stop
{
iSoftMCount = 0;
ucStep = 0;
PBDR |= 0x02; // produce pulse
}
LITE1_enableINT;
Any one has any ideas?
