NFC and LFCLK initialization

RE: NFC and LFCLK initialization

Simon — Fri, 18 Jan 2019 15:10:16 GMT

I managed to add an app timer (using RTC and the LFCLK) to the NFC Text Record Example, where the timer and the NFC worked as expected.

I have attached the project.

devzone.nordicsemi.com/.../record_5F00_text_5F00_with_5F00_RTC.zip

Best regards,

Simon

RE: NFC and LFCLK initialization

LWittland — Thu, 17 Jan 2019 10:59:40 GMT

No.

I still have no Idea what I can do to use the LFCLK both for NFC and the RTC.

I have tried to run the RTC from the Systick Timer instead of LFCLK, but that caused problems with other parts of our application, so this not an option either.

Also, since the soft device uses up RTC channels 0 and 1, I am limited to RTC chanel 2.

Any Ideas?

RE: NFC and LFCLK initialization

Simon — Wed, 16 Jan 2019 14:33:33 GMT

Did you resolve the issue?

RE: NFC and LFCLK initialization

LWittland — Fri, 11 Jan 2019 08:53:50 GMT

Hello Simon,

I don't have to check if the clock module is initialized; when I initialize the NFC first, it always is.

Not executing the code in LFCLK_config() doesn't do what I need:

Skipping

ret_code_t err_code = nrf_drv_clock_init();

let's me use the LFCLK for my application; the NFC tag is readable, but empty.

Also skipping

nrf_drv_clock_lfclk_request(NULL);

the Tag is readable and contains the data I configured with NFC_NDEF_TEXT_RECORD_DESC_DEF, but the LFCLK isn't avaliable (more precisely: my RTC handler won't be called).

RE: NFC and LFCLK initialization

Simon — Mon, 07 Jan 2019 10:20:23 GMT

The nrf_drv_clock_init() is already run by the NFC example: fc_t2t_setup(..)-->hal_nfc_setup(..)-->nrf_drv_clock_init().

In the LFCLK_Config() function try to run nrf_drv_clock_init_check() first, and only initialize the clock module if it is not already initialized.

Best regards,

Simon

RE: NFC and LFCLK initialization

Simon — Thu, 03 Jan 2019 09:04:41 GMT

Sorry for the long delay, I will try to provide you with an answer by the upcoming monday/tuesday (7/8 january)

RE: NFC and LFCLK initialization

Simon — Fri, 21 Dec 2018 15:29:43 GMT

Currently, a huge portion of the support team are on christmas vacation, and might not be able to answer you in the closest future. In the first week of 2019 most of the staff will we back and you can expect an answer then.

Best regards,

Simon