* got problem with timer interrupt
@ 2010-01-18 15:28 wilbur.chan
0 siblings, 0 replies; only message in thread
From: wilbur.chan @ 2010-01-18 15:28 UTC (permalink / raw)
To: linuxppc-dev
A timer has been added into my system, and it is used to generate
continuous interrupt every 1 ms.
This hw is register by request_irq(19, handler_1ms)
Howeve I found that , it is longer than 1 ms between two interrupts,
for I used get_cycles everytime we entered
do_irq :
if(irq==19)
{
delta = get_cycle()-old;
}
but to find that delta is always larger than cpu cycles between 1ms.
Does anyone know why this happened?
regards,
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