Disable SoftDevice, disable HFCLK and use app timer driven by LFCLK

RE: Disable SoftDevice, disable HFCLK and use app timer driven by LFCLK

keigo — Fri, 24 Jun 2022 06:07:10 GMT

Thank you for your support.

I finally succeeded in disabling HFCLK. The current dropped dynamically so I concluded that the HFCLK stopped.

In my case, the SAADC remained enabled. It kept HFCLK enabled.

Thanks.

RE: Disable SoftDevice, disable HFCLK and use app timer driven by LFCLK

Jared — Thu, 19 May 2022 07:11:34 GMT

Hi,

Correct.

regards

Jared

RE: Disable SoftDevice, disable HFCLK and use app timer driven by LFCLK

keigo — Thu, 19 May 2022 03:23:26 GMT

Thank you for your support.

You mean debugger will activate HFCLK even if HFCLK is disabled before connecting debugger, is it correct?

Thanks.

RE: Disable SoftDevice, disable HFCLK and use app timer driven by LFCLK

Jared — Wed, 18 May 2022 14:34:48 GMT

Yes, the debugger will activate it. On a second thought, disabling the HFCLK completely is very difficult as many of the peripherals is dependent on it. What current do you measure and what is your requirement? I think the most effective method would be to just disconnect and stop advertising and then go to IDLE sleep instead of trying to disable the HFCLK completely.

regards

Jared

RE: Disable SoftDevice, disable HFCLK and use app timer driven by LFCLK

keigo — Wed, 18 May 2022 12:50:09 GMT

Thank you for your support.

I have checked HFCLKSTAT and it indicated "HFCLK running".

By the way, is it no problem with using J-Link debugger for the device running only with LFCLK?

Thanks.

RE: Disable SoftDevice, disable HFCLK and use app timer driven by LFCLK

Jared — Wed, 18 May 2022 12:24:25 GMT

Hi,

It would mean disabling effectively stopping HFXO and HFINT. RTC will automatically use the LFCLK when it's enabled. How do you verify the state of HFCLK? Do you check the HFCLK stat register?

regards

Jared

RE: Disable SoftDevice, disable HFCLK and use app timer driven by LFCLK

keigo — Wed, 18 May 2022 10:06:41 GMT

Thank you for your support.

Just let me confirm. Which is correct?

"Disabling HFCLK" means:

-HFXO is disabled but HFINT is enabled

-HFXO and HFINT are diabled

I"d like to disable both HFXO and HFINT, then enable LFCLK for RTC.

Thanks.

RE: Disable SoftDevice, disable HFCLK and use app timer driven by LFCLK

Jared — Wed, 18 May 2022 09:25:22 GMT

Hi,

Disabling the Softdevice should disable the HFCLK unless you have turned it on explicitly before initializing the Softdevice. How do you verify the state of the HFCLK?

regards

Jared

RE: Disable SoftDevice, disable HFCLK and use app timer driven by LFCLK

keigo — Wed, 18 May 2022 01:24:52 GMT

Thank you for your support.

I managed to disable SoftDevice, but I cannot disable HFCLK.

Could you tell me how to disable HFCLK?

Thanks.

RE: Disable SoftDevice, disable HFCLK and use app timer driven by LFCLK

Jared — Fri, 13 May 2022 09:30:19 GMT

Hi,

You can disable the Softdevice and HFCLK (if it hasn't been started explicit) by calling nrf_sdh_disable_request(). App timer will use the RTC which again will use the LFCLK. Not sure if you had any specific questions regarding this?

regards

Jared