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PocketMatrix • View topic - How to read the clock counter (CCNT) of PXA270 processor?
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How to read the clock counter (CCNT) of PXA270 processor?


How to read the clock counter (CCNT) of PXA270 processor?

Postby flashyou » Mar 27, 2006 @ 2:11pm

I'm writing a small assembly routine to read the clock counter (CCNT) from
my Pocket PC (PXA270 processor).

I used the following assembly code:
MRC p14, 0, R0, c1, c1, 0

Unfortunately, all I got was a constant number (86334131) while it
was supposed to change over time.

What's wrong? Please help me.
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Postby refractor » Mar 27, 2006 @ 5:13pm

How have you configured the PMNC register? If you haven't configured it then the clock counter is probably not turned on and you need to set the bottom bit of the PMNC register.

Look at chapter 8 (especially page 104) of <a href="ftp://download.intel.com/design/intelxscale/27347302.pdf">this</a>.
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