NRF_Fstorage Address Issue

[Ahtasham Baig]

Hi i am working on project where i need to store logs on flash, i included nrf_storage and set start address 0x42000 and end address 0x50000 according to my application, my product contains softdevice, application and bootloader.... but when i try to read write or erase specific address it get stuck ... my application is based on FreeRTOS 

[Jørgen Holmefjord]

Hi,

What exactly do you mean by "it get stuck"? Do you get a hardfault, an error, code stuck in a loop waiting for an event, etc.?

Can you post the code you used for configuring fstorage, and how you perform the read/write/erase operations?

Have you made sure that the start and end addresses used for fstorage does not overlap with the application code area?

Best regards,
Jørgen

[Jørgen Holmefjord]

I would recommend you to check the return code, rc, from nrf_fstorage_write. The destination address needs to be word-aligned, which it does not seems to be. 

You may also debug the application to see exactly where the code is stuck.

[Ahtasham Baig]

i tried to debug and my data is multiple of program unit which is 4

[Jørgen Holmefjord]

Yes, but the destination address (0x42001) in your code snippet it not. There is a check inside nrf_fstorage_write():

NRF_FSTORAGE_PARAM_CHECK(addr_is_aligned32(dest),                NRF_ERROR_INVALID_ADDR);

[Ahtasham Baig]

Can you guide me how can i resolve this issue and what should be my address range as you can see from the memory layout on above image

[Jørgen Holmefjord]

From your image, the memory range provided to Fstorage seems to be fine. However, you need to provide a word-aligned address to nrf_fstorage_write function, as it can only write full words. Instead of writing to address 0x42001, you need to write to 0x42000 or 0x42004.

[Ahtasham Baig]

Hi i tried to writing at address 42000 which is wrote successfully but it is not reading log as :

00> <info> app: fstorage example started.
00>
00> <info> app: SoftDevice is present.
00>
00> <info> app: Initializing nrf_fstorage_sd implementation...
00>
00> <info> app: ========| flash info |========
00>
00> <info> app: erase unit: 4096 bytes
00>
00> <info> app: program unit: 4 bytes
00>
00> <info> app: ==============================
00>
00> <info> app: Writing "hello_world!" to flash.
00>
00> <info> app: --> Event received: wrote 12 bytes at address 0x42000.

it get stuck at reading i am reading as 

rc = nrf_fstorage_read(&fstorage,0x42000,&readdata,12);
NRF_LOG_INFO("Data: %s read at flash",readdata);

[Jørgen Holmefjord]

Can you post the code full code for the read? How does it get stuck? Are you getting an error, stuck in a loop, etc?

[Ahtasham Baig]

Here is my code Snippet;

[Jørgen Holmefjord]

The following line seems to cause a hardfault in your application:

NRF_LOG_INFO("Data: %s read at flash", readdata);

You declare readdata as a char pointer, and set this to NULL. Then you pass a reference to this pointer to the nrf_fstorage_read function, but this will not store the pointer to the actual data in the readdata pointer, this will still be NULL after the function call.

You can read the data like this:

char readdata[12] = {0x00};

rc = nrf_fstorage_read(&fstorage, 0x42000, readdata, 12);
APP_ERROR_CHECK(rc);

NRF_LOG_INFO("Data: %s read at flash", readdata);

wait_for_flash_ready(&fstorage);

[Ahtasham Baig]

Hi i tried your method it is working but there is an issue i need to read schedules upto 200 byte so i am reading 256 bytes ... but there is issue i need to read multiple address at startup and when i ready single it reads correct data but later when i tries to read multiple addresses it either not completely reads data or gives error 
my address are as 
0x42000 for 12 BYTE DATA

0x42100 for 256 BYTE Data

0x42400 for 256 byte data

[Ahtasham Baig]

Issue resolved