pstorage_register return error when I try with more than 1024 bytes (block_size * block_count)

RE: pstorage_register return error when I try with more than 1024 bytes (block_size * block_count)

benevbright — Fri, 11 Sep 2015 13:39:47 GMT

Thanks all you guys. have a good day!

RE: pstorage_register return error when I try with more than 1024 bytes (block_size * block_count)

Susheel Nuguru — Fri, 11 Sep 2015 13:29:18 GMT

totally depends on how much persistant memory your application needs. PSTORAGE_MAX_APPLICATIONS boils down to "number of pages your application needs". So if your application needs X*1024 bytes of memory, then PSTRORAGE_MAX_APPLICATIONS must be set to X.

It is not safe to set it to higher value if you do not need it, that might hide your application bugs and even corrupt the memory without pstorage library being able to detect it.

RE: pstorage_register return error when I try with more than 1024 bytes (block_size * block_count)

benevbright — Fri, 11 Sep 2015 13:09:03 GMT

and I finally discovered. PSTORAGE_MAX_APPLICATIONS caused all. it's value set as 1. and I changed it like 20. and I could call pstorage_register with more data. now my questions is what's the safe number of PSTORAGE_MAX_APPLICATIONS?

Thanks.

RE: pstorage_register return error when I try with more than 1024 bytes (block_size * block_count)

benevbright — Fri, 11 Sep 2015 12:40:47 GMT

RK, Thanks for your advice. as you said, I looked code and found what makes return error.

there is

BLOCK_COUNT_CHECK(COUNT, SIZE)
if (((COUNT) == 0) || ((m_next_page_addr + ((COUNT) *(SIZE)) > PSTORAGE_DATA_END_ADDR)))
{
return NRF_ERROR_INVALID_PARAM;
}

------ I debug it. m_next_page_addr : 260096 PSTORAGE_DATA_END_ADDR : 261120

that was why. it's very small. It there any option to make more room for pStorage?

Thanks.

RE: pstorage_register return error when I try with more than 1024 bytes (block_size * block_count)

RK — Fri, 11 Sep 2015 07:44:44 GMT

well step through the code into the pstorage_register() function and see where it's returning the param error, it's only 20 lines long.

Page aligned means that one page must be an integral number of blocks, ie no block spans two pages. Since a page is 1024 bytes, a block size of 16 is page-aligned.

RE: pstorage_register return error when I try with more than 1024 bytes (block_size * block_count)

benevbright — Fri, 11 Sep 2015 06:31:07 GMT

above link says "Also, when registering for more than a single page, registered blocks must be page aligned." What does this mean?

RE: pstorage_register return error when I try with more than 1024 bytes (block_size * block_count)

benevbright — Fri, 11 Sep 2015 05:55:28 GMT

Hi, Thanks for your answer. but sample code from link I attached is registering 128 * 12 byte size. (In my case, that size returns error) and there is no difference between my code. I don't understand how this possible.

as you said. There is comment "multiple page" something on sample code.

but I found nothing special from sample code.

RE: pstorage_register return error when I try with more than 1024 bytes (block_size * block_count)

RK — Fri, 11 Sep 2015 05:28:04 GMT

You just need to look at the pstorage code. The maximum block size is the same as the maximum amount which can be written by sd_flash_write() which is 256 x 32 bit words which is 1024. That's also the size of one page in the nrf51.

So if you want to write more data, you'll need to chunk it up into multiple writes.