Splitting a Bluetooth LE application over two SoC -

[Lorenzo Amicucci]

Hi 
I have a Bluetooth LE application in nRF52840, with nRF Connect SDK. I would like to split it over two SoC: nRF52840DK + nRF52DK (nRF52832)

In the nRF52DK, I want to run HCI UART example (i.e. only the Nordic SoftDevice Controller)
In the nRF52840 I want to run the upper layers (so that I can send/receive HCI commands to the nRF52DK over UART.

How can I build my application so that it does not include the Controller and it can talk over UART to the nRF52DK? 
Based on my understanding, Zephyr is built to support an external controller.

Do you have some kconfig to enable it? how do I specify the UART to be used for this? 
From my application point of view, do I need to make any change?
Is this functionality handled by the BT Zephyr Host, or there is an extra layer that expose HCI to whatever application is running on nRF52840
(i.e. can I both use the zephyr HOST and at the same time send/receive HCI commands directly?)

Thanks

LA 

 

[Sigurd Hellesvik]

See Zephyr Bluetooth Stack Architecture Build Types.

Regards,
Sigurd Hellesvik

[Lorenzo Amicucci]

Thanks

this is good link. One thing I dont find: how you select UART vs SPI? 
(and how you specify which uart, uart0, 1, etc)

Thanks

BR
LA

[Sigurd Hellesvik]

See hci_spi.

Regards,
Sigurd Hellesvik

[Lorenzo Amicucci]

Thanks. 
For HCI_SPI, it looks like we need to enable CONFIG_BT_SPI in the host application?

What about for UART?

Thanks

BR
LA

[Sigurd Hellesvik]

Lorenzo Amicucci said:

For HCI_SPI, it looks like we need to enable CONFIG_BT_SPI in the host application?

I agree.

Lorenzo Amicucci said:

What about for UART?

See CONFIG_BT_HCI_BUS_TYPE for choices. It looks like H4 and H5 are UART. See their configs for the difference.

Regards,
Sigurd Hellesvik