Raspberry Pi Forums

Posted: **Mon May 02, 2016 7:16 pm**

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

Posted: **Mon May 02, 2016 7:24 pm**

Core (GPU) or Arm (CPU)?

Arm:

Code: Select all

watch '(vcgencmd measure_clock arm)'

Core:

Code: Select all

watch '(vcgencmd measure_clock core)'

Posted: **Tue May 03, 2016 7:53 am**

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

Raspberry Pi Forums

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

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

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

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