Controller hangs with call to fds_init()

[ManishK]

I'm using nrf52 with SDK version 12.0.0. I'm trying to use the FDS for my application. I used one of the existing fds example from link fds_example.

With this example, I call the function "fds_test_init" which in turn calls "fds_init". After debugging, I reached to a point where the function "sd_flash_write" is called and this function declaration is taken from the place "/nRF5SDK/components/softdevice/s132/headers/nrf_soc.h".

It is at the call of this function that the controller hangs with message "Starting target cpu" in the console window.

Below is the definitions of FS & FDS macros:

• FS_QUEUE_SIZE = 4
• FS_OP_MAX_RETRIES = 3
• FS_MAX_WRITE_SIZE_WORDS = 1024
• FDS_OP_QUEUE_SIZE = 4
• FDS_CHUNK_QUEUE_SIZE = 8
• FDS_MAX_USERS = 3
• FDS_VIRTUAL_PAGES = 3
• FDS_VIRTUAL_PAGE_SIZE = 2048

Could anyone support me here to understand why the controller hangs at the call of the function "sd_flash_write"?

Thanks in advance.

[Petter Myhre]

The example should be used with a SoftDevice, I tested your code, and it runs to while (write_flag==0);, but write_flag never becomes 1, because you haven't enabled the SoftDevice.

From the documentation of sd_flash_write() you can see that it has different behavior depending if the SoftDevice is enabled or not:

If the SoftDevice is enabled:
This call initiates the flash access command, and its completion will be communicated to the
application with exactly one of the following events:
    - @ref NRF_EVT_FLASH_OPERATION_SUCCESS - The command was successfully completed.
    - @ref NRF_EVT_FLASH_OPERATION_ERROR   - The command could not be started.

If the SoftDevice is not enabled no event will be generated, and this call will return @ref NRF_SUCCESS when the write has been completed.

[ManishK]

What should I do to enable the softdevice?

[Petter Myhre]

Have a look at ble_stack_init(); in the example you linked to in your question.