NRF54L15: BLE Softdevice and SPIM20?

RE: NRF54L15: BLE Softdevice and SPIM20?

Philipp Kremer — Tue, 09 Jun 2026 05:36:00 GMT

Thanks a lot, this resolved the Issue!

Best,
Philipp

RE: NRF54L15: BLE Softdevice and SPIM20?

Vidar Berg — Mon, 08 Jun 2026 14:14:17 GMT

Dear Philipp,

You also have the console which will print the boot banner on startup before the logger is enabled (Note: console is selected by default by the board file). Please try with the following configuration in your project configuration (prj.con):

CONFIG_LOG=n
CONFIG_LOG_BACKEND_BM_UARTE=n
CONFIG_CONSOLE=n
CONFIG_BM_UARTE_CONSOLE=n
CONFIG_NCS_BARE_METAL_BOOT_BANNER=n

You may also look at the .config output to verify what configurations are applied to your build.

Best regards,

Vidar

RE: NRF54L15: BLE Softdevice and SPIM20?

Philipp Kremer — Mon, 08 Jun 2026 13:59:25 GMT

Dear Vidar,

thanks for the quick reply. Unfortunately, this doesn't resolve the issue, as I am using RTT and UART logging was already deactivated. Here is related part of my prj.conf (rest is just from the BLE example):

CONFIG_LOG=y
CONFIG_LOG_BACKEND_BM_UARTE=n
CONFIG_LOG_BACKEND_RTT=y
CONFIG_USE_SEGGER_RTT=y

CONFIG_NRFX_SPIM=y

Do you have other suggestions?

Thanks,

Philipp

RE: NRF54L15: BLE Softdevice and SPIM20?

Vidar Berg — Mon, 08 Jun 2026 11:21:15 GMT

Hello,

The problem is that the SPIM20 instance is a shared with the UARTE20 that is used for console/log output by default (see Peripherals with shared ID and board configuration), and since the UART backend for the logger/console is initialised before main(), you will get an -EBUSY error when trying to initialise the SPIM20 after. To free this peripheral, you can disable the logger and console in your project configuration, or change the default UART instance in the board configuration.

Unrelated to the issue, but for SPIM2x it is also recommended to use pins on PORT 1 when possible to avoid cross domain use: https://docs.nordicsemi.com/r/bundle/ps_nrf54l15/page/chapters/pin.html-dedicated_pins

Best regards,

Vidar