Dual Bank DFU in NRF52805 using an external flash

RE: Dual Bank DFU in NRF52805 using an external flash

Hung Bui — Tue, 18 May 2021 14:37:34 GMT

Hi Dipak,

nrf_dfu_req_handler_init () is called to initialize the dfu_req_handler but I don't see the reason you need to modify that. What you need to modify is what I mentioned before to change the backend of the fstorage module. So instead of the nrf_fstorage_sd.c , you need to define your own nrf_storage_spi.c so that it handle the flash operation with the external SPI interface, not the internal flash.

nrf_dfu_req_handler_init () initializes the nrf_dfu_flash module, but what you need to modify is the fstorage which is the lower level of the nrf_dfu_flash.

RE: Dual Bank DFU in NRF52805 using an external flash

Dipak — Tue, 18 May 2021 12:14:57 GMT

But may I ask do you have to use nRF52805 and the W25Q32 in your design? The DFU dual bank issue can be solved by simply use an nRF52832 which has 512kB of flash.

Yes, I have NRF52805 & W25Q32 in my design.

Right now, I have no option except external flash.

RE: Dual Bank DFU in NRF52805 using an external flash

Dipak — Tue, 18 May 2021 12:11:29 GMT

Hi Hung,

Sorry for the late reply!

I have read this thread,

https://devzone.nordicsemi.com/f/nordic-q-a/48961/dfu-with-external-qspi-memory

and after entering into DFU first nrf_dfu_req_handler_init is initialize correct?

if yes, then what kind of changes I have to make in the nrf_dfu_req_handler_init function for the external_SPI_interface _init?

Dipak

RE: Dual Bank DFU in NRF52805 using an external flash

Hung Bui — Mon, 10 May 2021 13:13:06 GMT

Hi Dipak,

We currently don't have an example on how to use external flash for doing DFU. What you need to do is to add a new backend to the fstorage to store data in external flash instead of the internal flash. It's similar to the nrf_fstorage_nvmc.c and the nrf_storage_sd.c . But you need to write your own library to access SPI flash instead. This would require some study on how the DFU bootloader works and how fstorage works.

But may I ask do you have to use nRF52805 and the W25Q32 in your design ? The DFU dual bank issue can be solve by simply use a nRF52832 which has 512kB of flash.