Write to FLASH inside BLE event

[schef]

Hello, i have read if not all posts about writing to FLASH while using BLE. But could not find the desirable method.

What i would like to do is to write to flash from characteristic write as it comes. The problem is that sd_flash_write is asynchronous.

So i have to block the device until the write has finished or else the writen data may get corrupted. The only way to know that the sd_flash_write had finished is to wait for NRF_EVT_FLASH_OPERATION_SUCCESS inside sys_evt_handler.

But as some other post mentioned if you call the flash command inside the ble event you don't get the response.

One way to get the response is to store the data somewhere, make a flag which is looked up in the main context. But that means that i am limited to the array size i am storing data in.

Isn't there a way to write directly synchronous from the BLE event or at least to somehow block the further execution untill i get the event?

I'm using nrf52832 with sdk 12.2

Thanks

[Hung Bui]

Well, stay for a long time in a interrupt handler may not the very best solution. CPU will be occupied and any other interrupt handler except for APP HIGH will not be executed. Note that there is a chance that the flash write will not be successful. For example when the softdevice return NRF_EVT_FLASH_OPERATION_ERROR then you may end up in a infinite loop.

I still don't know what type of data buffer that you have and which event you have to handle the flash writing. If it's not BLE event, but application event (interrupt from peripheral ) then you can set it to APP LOW priority and you should be able to wait for the event instead of writing and waiting word by word.