FDS asynchronous operation to synchronous

[Ansil]

Hi

I am writng some peer information just after connection using pm_peer_data_store. I need to read the data stored to do the next task. As the FDS is asynchronous, i am not able to wait for the completion of FDS write using a wait loop. Is there any way to make it synchronous? Please suggest  a solution to this.

with regards,

Ansil

[Vidar Berg]

Hi Ansil,

It's not possible to make the API itself synchronous while the softdevice is enabled. However, are you sure you need to read the data back immediately after storing it? Since you already know what you've written, why not use that data directly for the next task?

Best regards,

Vidar

[Ansil]

Hi Vidar,

It is for the verification that the data exists in flash and the data is critical. Then the chip can reply that the information is stored successfully.

with reagrds,

Ansil

[Vidar Berg]

Hi Ansil,

I would suggest changing the program logic to allow this response to be sent after receiving the FDS callback.

Best regards,

Vidar

[Ansil]

Hi Vidar,

I have used a wait cycle with sd_app_evt_wait() inside. And i didn't obtain any event from the peer_data_storage.c. As per documentation, the priority of flash access is four (priority) and also "In order to wake up from disabled interrupts, the SEVONPEND flag has to be set in the Cortex-M MCU's System Control Register (SCR), CMSIS_SCB" (disabled interrupts) . So are these the reasons for this asynchronous behaviour and also are FDS events disabled interrupts? 

with regards,

Ansil

[Vidar Berg]

Hi Ansil,

I assume this loop is inside a BLE event running in the SD_EVT_IRQn. This would prevent the application from receiving the flash events signaling the completion of the flash writes from the SoftDevice.

[Ansil]

Hi Vidar,

Thank you for the reply. I will change the program logic then.

with regards,

Ansil