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NCS(1.3.2) nRF Desktop cannot connect with Zephyr SW LL.

I want to use nrf52833 as the keyboard and nrf52820 as the dongle.Refer to the example of
ncs1.3.2\nrf\applications\nrf_desktop, I want to add the LLPM of nrf52820.

But there is Only app_ZDebug.conf configuration of ncs1.3.2\nrf\applications
\nrf_desktop\configuration\nrf52820dongle_nrf52820 .

CONFIG_BT_LL_SW_SPLIT=y Use Zephyr SW LL, which seems to be due to insufficient RAM. How can
nrf52820dongle use Nordic SoftDevice LL?

What is puzzling is that I tried to use Zephyr SW LL without success.

Our company has nRF Desktop mouse and dongle hardware, when I configure it as follows (using
Nordic SoftDevice LL):

  • west build -b nrf52840gmouse_nrf52840 -d nrf52840gmouse_nrf52840 -- - DCMAKE_BUILD_TYPE=ZDebug

  • west build -b nrf52840dongle_nrf52840 -d nrf52840dongle_nrf52840 -- - DCMAKE_BUILD_TYPE=ZDebug

The mouse can be connected to the computer through the dongle.

However, when I try to use configuration (using Zephyr SW LL):

  • west build -b nrf52840gmouse_nrf52840 -d nrf52840gmouse_nrf52840 -- - DCMAKE_BUILD_TYPE=ZDebugSplitLL

  • west build -b nrf52840dongle_nrf52840 -d nrf52840dongle_nrf52840 -- - DCMAKE_BUILD_TYPE=ZDebugSplitLL

The mouse cannot be connected to the computer through the dongle.

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