hardware CS not working when using BLE with nRF5340DK

RE: hardware CS not working when using BLE with nRF5340DK

Einar Thorsrud — Wed, 24 Feb 2021 13:14:07 GMT

Hi,

Thank you for pointing out the lacking documentation. I have forwarded it to the team so that it can be fixed.

RE: hardware CS not working when using BLE with nRF5340DK

Nicolas Brunner — Tue, 23 Feb 2021 14:24:42 GMT

Thanks for the information, I use the RTT instead of UART for the logging.
I measured with a ohmmeter and saw the pins P0.10, P0.11, P1.0 and P1.1 were connected to the Signal switches that further connect them to the virtual COM port.
It would be helpful to add to the Virtual COM port page the information about the port for the network core.
In the Solder bridge configuration page, information about S27 to SB30 is also missing.

RE: hardware CS not working when using BLE with nRF5340DK

Einar Thorsrud — Tue, 23 Feb 2021 13:18:14 GMT

Hi,

[quote user="Nicolas Brunner"]HCI RPMsg, for what function is this UART used ? Is there a documentation about it ?[/quote]

It is used for logging. It is not explicitly documented in that example, but logging is enabled by default. You can disable it by setting CONFIG_LOG=n in hci_rpmsg's prj.conf.

[quote user="Nicolas Brunner"]I saw that pins are configure to be used by the network core in the function remoteproc_mgr_config(). Why isn't there a way to desactivate this function with prj.conf ?[/quote]

Calling of remoteproc_mgr_config() among other things is configured via CONFIG_TRUSTED_EXECUTION_NONSECURE, but there is no way to disable configuration of just the UART pins via prj.conf out of the box. I agree that would make sense though, if you do not want UART logging from the network core.

RE: hardware CS not working when using BLE with nRF5340DK

Nicolas Brunner — Tue, 23 Feb 2021 12:14:29 GMT

Thank you, instead I have reconfigured the P1.1 to be used by the application core.
When using the HCI RPMsg, for what function is this UART used ? Is there a documentation about it ?
I saw that pins are configure to be used by the network core in the function remoteproc_mgr_config(). Why isn't there a way to desactivate this function with prj.conf ?

RE: hardware CS not working when using BLE with nRF5340DK

Einar Thorsrud — Tue, 23 Feb 2021 09:51:20 GMT

Hi,

The actual issue here is that P1.1 (33) is used by the network core. So the fix is to use another pin. I have tested with P1.3, and with that it works as expected with both secure and non-secure, using both west on the command line and SES.

RE: hardware CS not working when using BLE with nRF5340DK

Nicolas Brunner — Mon, 22 Feb 2021 07:49:43 GMT

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

RE: hardware CS not working when using BLE with nRF5340DK

Einar Thorsrud — Fri, 19 Feb 2021 20:01:04 GMT

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.

RE: hardware CS not working when using BLE with nRF5340DK

Nicolas Brunner — Thu, 18 Feb 2021 11:23:40 GMT

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.

RE: hardware CS not working when using BLE with nRF5340DK

Einar Thorsrud — Wed, 17 Feb 2021 14:34:23 GMT

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.

RE: hardware CS not working when using BLE with nRF5340DK

Nicolas Brunner — Wed, 17 Feb 2021 08:11:19 GMT

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.