How to write uint8_t some_array via FDS ?

RE: How to write uint8_t some_array via FDS ?

ovrebekk — Wed, 09 May 2018 10:45:22 GMT

I am glad to hear you found a solution 🙂

RE: How to write uint8_t some_array via FDS ?

purgoufr — Thu, 15 Mar 2018 04:54:52 GMT

I still have not figured out how to do it using FDS, but fStorage does work. Thank you Torbjørn.

RE: How to write uint8_t some_array via FDS ?

ovrebekk — Wed, 14 Mar 2018 09:09:58 GMT

1) No, you can remove the CLI library if you like. This is just included to provide a command line interface when running the example. If you delete all the cli_xxx functions from main.c the library should no longer be used.

2) The m_hello_world variable is a char array, which is almost the same as a uint8_t array (the only difference is that char is signed, while uint8_t is unsigned).

You can modify line 292 in main.c to write your some_array instead of m_hello_world:
rc = nrf_fstorage_write(&fstorage, 0x3f000, some_array, sizeof(some_array), NULL);
APP_ERROR_CHECK(rc);

The read function works almost exactly the same, and you can use that to read the data into another array:

rc = nrf_fstorage_read(&fstorage, 0x3f000, second_array, sizeof(second_array));
APP_ERROR_CHECK(rc);

If you just want to move data from one RAM buffer to another you can also use memcpy(..), but you probably know this already.

Best regards
Torbjørn

RE: How to write uint8_t some_array via FDS ?

purgoufr — Tue, 13 Mar 2018 14:23:15 GMT

Hi ovrebekk, thanks for your answer. I have a few questions;

Q-1 Do I have to use the Cli.c library? If no, how to read array and then store it into another array ?

Q-2 Is there an example of FDS that I have described above (uint8_t some_array [7])?

I looked the LINK, but it wrote "static uint32_t const m_deadbeef[2] = {0xDEADBEEF,0xBAADF00D};" This is not exactly what I want to learn. "uint8_t some_array [7] = {0x00,0x01,0x02,0x03,0x04,0x05,0x06};" I want to save it and read it, then copy it to another array.

RE: How to write uint8_t some_array via FDS ?

ovrebekk — Tue, 13 Mar 2018 13:45:50 GMT

Hi Ugur

Have you had a look at the fstorage example in the SDK?

If you are looking for a simple library to read and write one or more bytes to flash I think fstorage is the better choice. FDS is more sophisticated, but might be a bit overkill for what you are trying to do.

Best regards
Torbjørn