Hi, I am using timer1 of the lpc932 to count for about 22 sec. It works fine the first time I call the fuction to make it run. But the second time it is called, one of the variables does no reach its maximum. For intance if (++ticks10 == 250) does not reache 250, but 249 and goes back to zero. What could be wrong?
here is the isr for the timer1

void buzzer_timer(void) interrupt 3
{
T1_Start(); // start timer again

if (++ticks10 == 250)
{
if (LCD_Flag == 0) // lcd off
{
if (P2 &= 0x0C) // LCD on
_nop_();
else
P2 |= 0x0C;

if (++ticks == 40){
P2 &= ~0x0C;
ticks = 0;
SCON &= 0x50;
LCD_Flag = 1;
TR1 = 0;
}
}
ticks10 = 0;
}
return;
}