How can we enable app_timer2 with sdk 17.1.0?

RE: How can we enable app_timer2 with sdk 17.1.0?

Hieu — Mon, 19 Jun 2023 07:33:35 GMT

Hi Inchul,

Thank you for catching that I didn't update the CTIV and TEMP_CTIV options. To provide a reference for future readers of this post, those configs are discussed here:

case about parameter NRF_SDH_CLOCK_LF_RC_CTIV and NRF_SDH_CLOCK_LF_RC_TEMP_CTIV

NRF_SDH_CLOCK_LF_RC_CTIV and NRF_SDH_CLOCK_LF_RC_TEMP_CTIV Value deep understanding

Regards,

Hieu

RE: How can we enable app_timer2 with sdk 17.1.0?

Inchul Lee — Mon, 19 Jun 2023 03:56:43 GMT

Hi Hieu,

First of all, we ommited that have to initialize SoftDevice. So we had initialized it.

We comfirmed to work app_timer with yuour example but modified sdk_config.h as the following.

------------------------------------------------------------------------------------------------------------------------------

//==========================================================

// <h> Clock - SoftDevice clock configuration

//==========================================================
// <o> NRF_SDH_CLOCK_LF_SRC - SoftDevice clock source.

// <0=> NRF_CLOCK_LF_SRC_RC
// <1=> NRF_CLOCK_LF_SRC_XTAL
// <2=> NRF_CLOCK_LF_SRC_SYNTH

#ifndef NRF_SDH_CLOCK_LF_SRC
#define NRF_SDH_CLOCK_LF_SRC 0 //_LIC : 1 -> 0
#endif

// <o> NRF_SDH_CLOCK_LF_RC_CTIV - SoftDevice calibration timer interval.
#ifndef NRF_SDH_CLOCK_LF_RC_CTIV
#define NRF_SDH_CLOCK_LF_RC_CTIV 16 //_LIC : 0 -> 16
#endif

// <o> NRF_SDH_CLOCK_LF_RC_TEMP_CTIV - SoftDevice calibration timer interval under constant temperature.
// <i> How often (in number of calibration intervals) the RC oscillator shall be calibrated
// <i> if the temperature has not changed.

#ifndef NRF_SDH_CLOCK_LF_RC_TEMP_CTIV
#define NRF_SDH_CLOCK_LF_RC_TEMP_CTIV 2 //_LIC : 0 -> 2
#endif

------------------------------------------------------------------------------------------------------------------------------

We apply parameters which were in sdk 15.2. We think that XTAL on custom board is not working incorrect.

Thanks.

Inchul Lee

RE: How can we enable app_timer2 with sdk 17.1.0?

Hieu — Thu, 15 Jun 2023 11:44:33 GMT

Hi Inchul,

I had a case where a move to app_timer2 caused issue before. However, in that one, the issue only happened when the timer is used in a very particular way; and the issue was that the timer worked incorrectly, rather than not worked at all.

Here is my quick attempt at getting app_timer2 to work with LFRC in the ble_app_blinky_c example.

devzone.nordicsemi.com/.../c309597_5F00_app_5F00_timer_5F00_230615_5F00_01.zip

Hieu

RE: How can we enable app_timer2 with sdk 17.1.0?

Inchul Lee — Thu, 15 Jun 2023 00:48:29 GMT

Hi Hieu,

Thank you for your reply. As your suggestion, we tried NRFX_CLOCK_CONFIG_LF_SRC configuration in sdk_config.h to 0(RC). But app_timer is still not woking. So we tried other parameter reconfiguration.

For your information, this schematic was workiong in SDK 15.2. Now we are using source "nRF5_SDK_17.1.0_ddde560\examples\ble_peripheral\ble_app_blinky_c" to test app_timer.

We attached sdk_config.h which is testing app_timer_v2. Please check. If possible, would you give ours the sample example source code which is using internal RC?

Inchul Lee

devzone.nordicsemi.com/.../0042.sdk_5F00_config.h

RE: How can we enable app_timer2 with sdk 17.1.0?

Hieu — Wed, 14 Jun 2023 13:52:47 GMT

Hi Inchul,

In the absence of more details, I assume that your app_timer is not working due to the lack of external crystal for LFCLK source, and also a missing reconfiguration of LFCLK source to internal RC oscillator.

If that assumption is true, please try reconfiguring the NRFX_CLOCK_CONFIG_LF_SRC configuration in sdk_config.h to 0 (RC).

Hieu