hardware CS not working when using BLE with nRF5340DK

1 more information:

After running the code with BLE, the code without BLE only works after an hardware reset otherwise the CS is also not working.

Hi,

I tested your code and I see that the CS pin toggles as expected when CONFIG_BT is set to n but not when set to y. I am not able to explain this right now though so I need to get back to you tomorrow.

Edit: I just noticed that this issue only occurs when building for secure mode (nrf5340dk_nrf5340_cpuapp). Building for non-secure (nrf5340dk_nrf5340_cpuappns) CS works as expected.

Thanks for this information but what do I need to do to run it in non-secure ?

I have tried with SES to build it for non-secure but it crash when calling nrfx_spim_init().

After that, I saw that SPM was not listing SPIM4 to the console, so i use SPIM3 because it was listed. Now my code get stuck in nrfx_spim_xfer() waiting for NRF_SPIM_EVENT_END that never come.

Hi,

To build for non-secure mode you select nrf5340dk_nrf5340_cpuappns as the board instead of nrf5340dk_nrf5340_cpuapp. But for this issue in general I do not yet understand what causes this nor do I have any other proposed fix at this point. I will look more into it, though.

Thanks, it's what I did but I got the problems described in my previous message.