I'm currently using ELDK 3.0 (kernel 2.4.25) and a mpc823e trying to do some latency measurements for my final thesis project.
I'm wondering if there is any possibility to read the Timer Counter Register (TCN1) in user space. I have initially used gettimeofday(), which provides sufficient resolution (usec), but I suppose that solution probably adds on some kind of unknown context-switch latency. Does anyone have a clue on how to access this in user space? Could inline assembler or perhaps mmap() do the trick (I'm using C as programming language)?. Regards, Bjorn -------------- next part -------------- An HTML attachment was scrubbed... URL: http://ozlabs.org/pipermail/linuxppc-embedded/attachments/20050307/8820fe30/attachment.htm
