How do I read the current core clock speed from the SOC

[Conjur]

I need the ability to read the current core frequency from C. I do not want a bloated library, nor to execute a script and scrape the output (vcgencmd), nor to read the startup value from config.txt

I have looked through the registers, and can not find anything.

I need to calculate spi dividers dynamically.

V/r,
Mike

[Rive]

Core (GPU) or Arm (CPU)?

Arm:

Code: Select all

watch '(vcgencmd measure_clock arm)'

Core:

Code: Select all

watch '(vcgencmd measure_clock core)'

[ghans]

Is think the only stable , userspace interface you get is the virtual "cpufreq" files
in sysfs. Anything else is propably just built on top of that.

Also

Code: Select all

cat /proc/cpuinfo | grep "Mhz"

ghans