FDS Implementation

[Somesh Burkule]

Hello Everyone,

I am trying to implement fds in nrf52832 with sdk 15.2. getting some issues. I am using 5 record key's and 1 file id.

Before coming to that, Can anyone explain what is file id, record id and record key? I have read documentations but not clear about it.

[Somesh Burkule]

Jared said:

You use record KEY and file ID when you want to access a Record. 

Thanks Jared.

So we can use fds without using Record Id?

[Jared]

You don't need to pass the Record id when you want to access a record since this is something that will be handled by the module. Only Record Key and File Id is necessary.

[Somesh Burkule]

What if I use file I'd and same record key?

[Jared]

From documentation: 

fds_record_find (): This function finds the first record in a file that has the given record key. To search for the next record with the same key in the file, call the function again and supply the same fds_find_token_t structure to resume searching from the last record that was found.

[Somesh Burkule]

Hi Jared,

I am using one file id and 5 record key's. while writing to file, giving error to 5th record. then I increased fds internal queue size from 4 to 8. then it worked properly.

what this queue useful for? how we can define this queue size depend on records?

I need to add one more file id and record key. what value should I use for queue?

[Jared]

Hi,

 

Somesh Burkule said:

what this queue useful for? how we can define this queue size depend on records?

 From documentation:

The size of the internal queue of FDS operations. Increase the size if there are many users, or if your application will queue many operations at a time without waiting for the previous operations to complete. In general, you should increase the queue size if you frequently receive FDS_ERR_NO_SPACE_IN_QUEUES errors.

The FDS module is an asynchronous module, and uses a queue for scheduling operations. The size of the queue determines therefore how many write/read etc operations you can schedule at once. 

regards

Jared

[Somesh Burkule]

Thanks Jared for help.

I have implemented successfully fds operations with 2 file id's and 6 records in nrf52. not much difficult as much I was thinking.