FDS external spi flash

[ypearson]

Can you FDS for an external spi flash device/chip?

[bjorn-spockeli]

Hi ypearson,

I am afraid that FDS or fstorage, which is used by FDS, support external flash at the current moment. We're looking into this and it will probably be added in a future release of the SDK.

Best regards

Bjørn

[Turnaev]

Two years have passed.

Is it possible now to use an external flash instead of an internal one?

I looked at the FDS source code and realized that this is generally possible, but it is not clear to me how it is used inside the softdevice. And I would not want to remake someone else's library, losing the ability to upgrade to the new version in the future.

[Turnaev]

Ok.

If I replace fstorage to my own functions working with spi flash, SoftDevice will use any sector of the flash for their internal purposes via NVMC except MBR?

[bjorn-spockeli]

Turnaev: The SoftDevice will only use its designated flash area for internal purposes, see SoftDevice memory usage. 

[Turnaev]

Ok. Very good! Thank you!

[kxct]

Fds must modify the fds module code to use external flash, because fds will directly read the internal flash data through the data pointer.

[Nguyen Hoan Hoang]

This flash driver here is quite easy to use and works with almost all SPI Flash.  

https://github.com/IOsonata/IOsonata/blob/master/include/diskio_flash.h

usage example

https://github.com/IOsonata/IOsonata/blob/master/exemples/misc/flash_memory_demo.cpp