How i write one or two bytes into flash memory using fds lib?

[vishal]

I am using nRF52840 with sdk 15.0 version. I am able to read OR write data into flash using fds library. But now i want to write one or two bytes into flash and read this bytes,  how i know the length of that byte while reading data from flash. I know fds library need to at least 4 bytes

For example i want to write integer value 1 or 0. How this possible write and also read with length of read data.

Thanks......

[awneil]

Have you studied the FDS documentation?

It tells you that FDS works with Records - not individual bytes.

So you create a Record, and store your data into that Record.

Then you can read the Record, and update the Record.

infocenter.nordicsemi.com/.../lib_fds_functionality.html

See also: infocenter.nordicsemi.com/.../lib_fds_usage.html

Have you looked at the FDS example?

[vishal]

Hi,

Sorry for late response.. 

Will you please help me how i can store large amount of data in flash using FDS lib. Tha data size is 73Kbytes. 

Can you provide program snippet for the same how i manage file ID rec Key for saving this large data.

Thanks...

[awneil]

Did you actually read my previous reply?

Have you studied that documentation, and looked at that example?

vishal said:

Tha data size is 73Kbytes

Do you actually have that much Flash space available?

[vishal]

awneil said:

Have you studied that documentation, and looked at that example?

Yes, and also i am able to stored some small about of data into flash using FDS.

awneil said:

Do you actually have that much Flash space available?

Yes, We are using nRF52840 chip and having 1Mb flash memory, currently the application program occupy near about 215KB. Remaining flash size is available to store 73KB data.

Will you please guide me the way for how i can store this data?

Thanks...

[awneil]

vishal said:

i am able to stored some small about of data into flash using FDS

So what's your problem in extending that to a large amount of data?

what have you tried?

where are you stuck?

[vishal]

Thanks for fast reply....

Here is below function that i am currently using:

  ret_code_t ret = fds_write(FILE_ID, REC_KEY,data_to_store,length);
  if (ret == FDS_SUCCESS) {
    NRF_LOG_DEBUG("FDS stored");
  } else {
    NRF_LOG_DEBUG("FDS failed error code:%d", ret);
  }

Lets say FILE_ID = 0x0003 & KEC_KEY = 0x1111

data_to_store[length]; & length = 73KB.

Ques:

1. Is it possible to store 73KB data in one request of fds_write(..); with above FILE_ID & KEC_KEY ? 
2. How use FDS_VIRTUAL_PAGES & FDS_VIRTUAL_PAGE_SIZE in available in sdk_config.h for storing 73KB data.

Thanks..!!!

[awneil]

http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/lib_fds_format.html#lib_fds_format_max_length

[vishal]

Hello,

I have read this above link document but still confused for configuration for storing 73KB data. Now I am getting this error FDS_ERR_RECORD_TOO_LARGE. Currently i have set 

FDS_VIRTUAL_PAGES 10

FDS_VIRTUAL_PAGE_SIZE 2048

in sdk_config.h will please guide me how i increase the record size foe storing 73KB data.

Thanks...... 

[awneil]

The title of the thread is, "How to write one or two bytes" - and that was the initial question.

That question has been answered, and you are now asking a different question.

You should edit the title of the thread so that people who might know the answer to the new question will know what you're now asking.

 I don't know.

[vishal]

Ok sure Thanks for your supporting..!!!

[awneil]

New thread about writing large data here:

https://devzone.nordicsemi.com/f/nordic-q-a/41995/how-store-large-amount-data-73kbytes-into-flash-using-fds

Please verify the answer for this thread - to mark it as closed: