That depends on how accurate you want.  Sleep() functions can't be too accurate 
for Linux schedule characteristic.  To get best accuracy, you can use hardware
timer.  udelay() is a choice which reduces the overall system performance.

Best Regards,
Leo


> -----Original Message-----
> From: linuxppc-embedded-bounces+leoli=freescale.com@ozlabs.org
> [mailto:linuxppc-embedded-bounces+leoli=freescale.com@ozlabs.org] On Behalf
> Of tony
> Sent: Wednesday, May 24, 2006 5:24 PM
> To: linuxppc-embedded@ozlabs.org
> Subject: delay programming
> 
> 
> hi all
> 	I want to delay 1ms in the program,
> 	does usleep(1000) works accurate?
> 	any good idea?
> 
> regards
> tony
> 
> 
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