RC Oscilator with SDK 2.8.0

[FrankBajahr]

Hello Nordic team,

just received my first hardware and try to port my code which I developed by using the 54L15PDK board with SDK 2.7.0. At the PDK everything did run fine. 

When flashing the code to my hardware it seems that everything works out well, except the BT doesn´t work at all. As I got a hint to use the new 2.8.0 SDK for the latest chip iteration I was about to do so. However, when compiling the code previously developed for the 54L15PDK I get:

opt/nordic/ncs/v2.8.0/zephyr/drivers/timer/nrf_grtc_timer.c: In function 'sys_clock_driver_init':
/opt/nordic/ncs/v2.8.0/zephyr/drivers/timer/nrf_grtc_timer.c:511:36: error: 'NRF_GRTC_CLKSEL_LFLPRC' undeclared (first use in this function); did you mean 'NRF_GRTC_CLKSEL_LFCLK'?
511 | nrfx_grtc_clock_source_set(NRF_GRTC_CLKSEL_LFLPRC);
| ^~~~~~~~~~~~~~~~~~~~~~
| NRF_GRTC_CLKSEL_LFCLK
/opt/nordic/ncs/v2.8.0/zephyr/drivers/timer/nrf_grtc_timer.c:511:36: note: each undeclared identifier is reported only once for each function it appears in

We are using the LFCLK-PINS as GPIO. So I did the following configurations:

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y

CONFIG_CLOCK_CONTROL_NRF_K32SRC_500PPM=y

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION=y

CONFIG_CLOCK_CONTROL_NRF_CALIBRATION_LF_ALWAYS_ON=y

Any idea what has changed in the 2.8.0 not to work with the internal RC anymore? Is it really required to change to 2.8.0 to get the BT running?

The chip does show the following laser engraving: 54L15, QFAABB, 2435AB 

Well, as usual, any hints are welcome.

Best regards

Frank

[Einar Thorsrud]

Hi,

Which version of the development board do you have? If it is version 0.8.1 or higher, it is a DK even if it says "PDK" on the box. And if so, SDK 2.8.0 will work. Bu but if it has a lower version you need to obtain a DK, as the PDK only works with previosu versions. You will need to select the DK build target (not the PDK, which is no longer supported).

[FrankBajahr]

Hello Einar,

the development board I´m using is a PCA10156 0.7.0. 

I disconnected the 32kHz crystal on that PDK board and BT is running as it it supposed to be. I´m using SDK 2.7.0

When porting the software to my custom board I have been using the same source code as for the demo board. BT did not show up. Could be a hardware issue on the demo board too. So I was hoping that the new SDK 2.8.0 would do the job for me, but instead it was always giving me the above error pointing to the LF-clock.

Well, is there any easy way to send a CW out which would allow me to see a signal at the spectrum analyser? Maybe it's really a hardware issue?

Any hints are welcome.

Best regards

Frank