Using FDS Flash storage for user settings as well as for DFU

[Declan Traill]

I am building on a BLE DFU project which already has a NRF_FSTORAGE_DEF for allocation of non-volatile data used by DFU.
I want to add another instance of NRF_FSTORAGE_DEF for use with application setting data.

Can I define two different regions in Flash for this purpose, or do all uses of NRF_FSTORAGE_DEF need to be in a contiguous block of Flash memory?

One problem is that m_fs is used for both instance - which is easily fixed by renaming the DFU one to m_dfu_fs to avoid a name conflict.

The DFU section is set to between 0x7F000 - 0x80000.

Can I set my other section to 0x20000 - 0x22000?

I tried this and it compiles and runs OK, but when the pages_init() function is called on initialization of the FDS module, all three pages are marked as FDS_PAGE_UNDEFINED and are not erased, so all three are discounted and the function returns NO_PAGES.

I have the following settings in sdk_config.h:

#define FDS_VIRTUAL_PAGES 3

#define FDS_VIRTUAL_PAGE_SIZE 1024

#define FDS_VIRTUAL_PAGES_RESERVED 0

Are these settings correct for what I need?

If the Flash fs_data section needs to be contiguous, how should the region be defined? In the project settings or in code (as is done for the DFU region)?

Thanks...

Declan Traill

[RVM]

Hi

What compiler suite was used in this experiment? Am asking because the linker symbol reference seems to be somewhat specific to the KEIL compiler toolsuite?

RMV

[Hung Bui]

It should work with gcc and SES as well. We have covered those compile in the code: 

#elif defined ( __CC_ARM )
extern char Load$$LR$$LR_IROM1$$Base;
extern char Load$$LR$$LR_IROM1$$Length;
extern char Load$$LR$$LR_IROM1$$Limit;
#define CODE_START ((uint32_t)&Load$$LR$$LR_IROM1$$Base)
#define CODE_END   ((uint32_t)&Load$$LR$$LR_IROM1$$Limit)
#define CODE_SIZE  ((uint32_t)&Load$$LR$$LR_IROM1$$Length)

#elif defined ( __ICCARM__ )
extern void * __vector_table;
extern char RO_END$$Base;
#define CODE_START ((uint32_t)&__vector_table)
#define CODE_END   ((uint32_t)&RO_END$$Base)
#define CODE_SIZE  (CODE_END - CODE_START)

#elif defined(__SES_ARM)
extern uint32_t * _vectors;
extern uint32_t __FLASH_segment_used_end__;
#define CODE_START ((uint32_t)&_vectors)
#define CODE_END   ((uint32_t)&__FLASH_segment_used_end__)
#define CODE_SIZE  (CODE_END - CODE_START)

#elif defined ( __GNUC__ )
extern uint32_t __isr_vector;
extern uint32_t __etext;
#define CODE_START ((uint32_t)&__isr_vector)
#define CODE_END   ((uint32_t)&__etext)
#define CODE_SIZE  (CODE_END - CODE_START)
#endif

[RVM]

Thanks. Much appreciated.