Re: [ts-7000] reading pulses in realtime

[Andy Warner <>]

Grant Stockly wrote:
> 
>    A routine that prints a small printk message and exits gets 100-150
>    interrupts per second which causes user space programs to halt.  I'm
>    not sure if the interrupts would be faster without the printk
>    statemets.  I'd hope not, since this is a 200MHz processor we're
>    talking about.  ;)

printk will soak up CPU like a sponge. It usually uses polled output
to ensure that the message gets out no matter how messed up the
system is, as such, you'll likely spend the entire time needed to
send the characters out over the serial port in printk (modulo
hardware fifo depth.).
-- 


Andy Warner             Voice: (612) 801-8549   Fax: (208) 575-5634


 
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