fstorage_sd fails to execute a FLASH operation

[u_pj]

Hi,

we are porting code of our project from SDK 14.2 to SDK 15.3.0, and have encountered unexpected behavior from the fstorage module. Even though SoftDevice and BLE stack are initialized properly and all fstorage functions also return NRF_SUCCESS on each call, the actual FLASH operations are not executed.

The first operation is an attempt to erase one 4096 byte page of FLASH, the address of which is chosen so that it does not interfere with bootloader / FDS / application areas. nrf_fstorage_erase call returns NRF_SUCCESS, however nrf_fstorage_is_busy keeps returning true forever. This behavior has been replicated on nRF52832 and nRF52840 chips.

We have also tried using the fstorage_sd example project, however its behavior is also erroneous (or we are not using it right) as we are unable to store and retrieve string data, the string is either empty or has only few characters right, while the other ones are gibberish.

Thanks in advance for any tips.

Best regards,

PJ

[Vidar Berg]

Hi,

NRF_SUCCESS means that the flash operation got enqueued in the fstorage module, while the result of the actual task will be reported to the registered fstorage callback afterward. Maybe the callback is being blocked, or maybe the flash events from the Softdevice are not being forwarded correctly.

Please try to comment out the call to nrf_fstorage_is_busy (in case it can become blocking), then place a breakpoint in your fstorage callback to check if gets called after adding the erase task. 

You may also take a look at the example I uploaded to this thread: https://devzone.nordicsemi.com/f/nordic-q-a/44443/use-nrf_fstorage_sd-with-nrf_sdh_ble_enable/174621#174621.

Best regards,

Vidar

[u_pj]

Hello Vidar,

I went through all of your responses from the linked thread, it turns out nrf_sdh_soc.c was not compiled/linked. As a result SD events were never reaching the fstorage module. Adding that source file to Makefile's source list fixed the issue completely. Thanks for your help.

Cheers,

PJ