OTA-DFU of nrf52832 using External Flash instead of internal flash

[Prasad]

Hi guys!

1. I wanted to ask that can we use an external flash(connected via SPI/I2C interface to the mcu) instead of internal flash for storing downloaded image(s)?

2. If yes, what & all things have to be modified?

3. Is there an example for this?

I searched through the infocenter but, was unable to find any info regarding this.

Please Help!

Regards, Prasad.

[bjorn-spockeli]

Yes, that should be possible to implement as long as you do not plan on running it from external flash. Unfortunatly, we do not have an example for this.

My suggestion would be to replace the pstorage calls in the bootloader, i.e. instead using pstorage to write it to internal flash you use a function that takes the same parameters, but writes to external flash instead. Once you've written the entire firmware to the external flash, then I suggest that you reset the nRF52. The nRF52822 will then restart in the bootloader and you can then readback the application into internal flash.

Best regard

Bjørn

[Prasad]

Thanks Bjorn! This is exactly what I was looking for.

Only 1 doubt I have is that how the bootloader will get to know where exactly(whether in internal or external flash & also exactly at which address in the flash) I have kept the new image.

Regards, Prasad.