How to use the external flash of NRF9160DK

[Hannibalhz]

Dear Nordic Engineers

I have a question would like to ask you.

As we all know, NRF9160 DK has a 64MB external flash. Now, I would like to use this external flash to save the FOTA file. But, I can't use it, so I read the Use Guide of NRF9160 DK,.It shows the NRF52840 control exteral flash to switch to NRF52840 or NRF9160, and the default connection is NRF52840.

So I would like to know how to switch the external flash to NRF9160?

Please give me some suggestion.

Best regards,

[jeremyherbert]

The nrf52 controls the switch.

You can load a firmware like the one here: https://github.com/simon-iversen/sdk-nrf/tree/d1a11f2c39e3b8fb0af7652e7e720626f0e1298e/samples/nrf9160/http_update/application_update (see the hex file in this folder) to connect the 64Mbit flash to the nrf91.

[Priyanka]

Hi Wang,

You can refer to the Github Link created by one of my colleagues, which was provided in the earlier comment by @Jeremy Herbert. THe nRF52840 SoC on the 9160DK comes pre-programmed with a default firmware and in case this firmware is lost, you can program the hello_world sample onto it and then proceed. By default, the physical pins connected from ext_flash -> nRF9160 is switched out. In order to use the external flash, the board controller (nRF52) must switch the GPIOs in, which is what the .hex file in the github link does:

Also, you can read more about the board controller in the developer page:

Best Regards,

Priyanka