Sorry if this is too off topic, I actually don't have any problem with my nrf52840 dongle, but the App I'm communicating with. But maybe someone of you has run into the same...
The RISC-V coprocessor of the nRF54L Series requires a correct setup of the memory layout, for good performance and correct operation of both the application CPU and the FLPR
The nRF54L Series SoCs features a RISC-V coprocessor, enabling efficient, flexible designs with enhanced performance and ultra-low-power wireless connectivity.
