flash storage start and end address

[jonas.woerner]

Hello,

I am trying to find out where to put my persistent storage data in flash.

I have to set start_addr and end_addr, to use fstorage, but I dont know what addresses are free to use. I currently dont have a bootloader, but will add one soon, so I would need to place the data below the coming bootloader, so how do I determine the start and end addresses?

chip is the NRF52832 and S132 softdevice.

thanks a lot,

Jonas

[Vidar Berg]

Hello Jonas,

The bootloader start address will be stored in NRF_UICR->NRFFW[0] (@0x100010014) so you can use that as an upper boundary for your data section, then determine the lower boundary by subtracting the number of flash pages you need from the end address. I would recommend reuse the flash_end_addr() function in fds.c for finding the upper boundary. It will automatically the end of flash if no bootloader is present.

Here's the typical memory layout with softdevice, bootloader and app (source):

Updated link: https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/lib_bootloader.htm#lib_bootloader_memory

[fuheng]

I cannot found this picture of flash map in nRF52832 datasheet . Where did you find this picture ? Can you shown me the document ? Thanks a lot

[Vidar Berg]

I've updated the link in my answer above.