Hi, I want to use the timer16, I can control the timer with the timer16_ctl(), but the prolem is that when the timer countdown to zero, I can't use the interrupt handler to get this event, i have the following code for setup the interrupt handler. request_irq(SYS_TIMER_0_IRQ, timer_timeout_intr, SA_INTERRUPT, "AC49X timer", NULL); where the AC49X_SYS_TIMER_0_IRQ is 5, and timer_timeout_intr() is just a function to printk a line out. I want to know is just that simple to call request_irq() to have the interrupt handler be called when the interrupt is issued? Thanks! Co Ngai Fung -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ living is easy with eyes closed, misunderstanding all you see. - strawberry fields forever ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~