This is the mail archive of the
ecos-discuss@sources.redhat.com
mailing list for the eCos project.
timer
- To: ecos-discuss at sources dot redhat dot com
- Subject: [ECOS] timer
- From: mekala natarajan <mekala_natarajan at yahoo dot com>
- Date: Tue, 15 May 2001 04:29:54 -0700 (PDT)
Can someone tell me the timer chip(and clock
frequency) that is used in MBX kit.
(eg.,For i386 pc target, the timer chip is 8254 whose
clock frequency is 1193180HZ, from which we derive at
the kernel clock of 10ms.)
Basically i want to run my application within a time
frame of 2ms(which is less than a tick).Within this
2ms frame, i need to get the current time at various
points of the frame which will be in terms of
microseconds.But ecos get current time system call
will return time in terms of ticks. For this to happen
i reduced the tick resolution to 500us. But with this
configuration performance is degrading, since most of
time is getting wasted in processing the interrupt.
Now i don't want to use the kernel clock.
How can i solve this problem.
Can i directly access the timer chip and derive the
desired periodicity from this.
Is this possible?
If yes.How can i do this?
Regards,
mekala
__________________________________________________
Do You Yahoo!?
Yahoo! Auctions - buy the things you want at great prices
http://auctions.yahoo.com/