flash operation error

[Ben.Qin]

I usually see a system event "NRF_EVT_FLASH_OPERATION_ERROR" when updating my device firmware. SDK says that this event indicates that the ongoing flash operation has timed out with an error. What I have done would cause this error? How do I handle this event? I don't think restart DFU is a good choice. Thanks.

[Stefan Birnir Sverrisson]

Hi

Thank you for the update.

You might get a timeout if you are performing a flash erase operation during DFU operation, and the connection interval is very short, 25ms or shorter. I think the default bootloader only performs a flash write, which is not that time consuming and should not time out in this case. Have you modified the default bootloader or are you by any chance performing a flash erase operation during the DFU.

Are you able to update to the more recent softdevice and SDK? I think the pstorage was first introduced in S110 6.0.0. A lot of improvements have been implemented since then. I know that SDK 8.0.0 introduces a way to handle the NRF_EVT_FLASH_OPERATION_ERROR by retrying a flash operation number of times. Perhaps you could mimic that functionality from SDK 8.0.0 into your code.

[Ben.Qin]

Thank you, Stefan. I don't erase flash. But I saw the range of the connection interval was modified by some one of us. It was limited between 11.25ms to 15ms instead of between 20ms to 30ms. It might be the cause. I'll test it. Otherwise, I'll learn the later soft device to get a solution, or update to the latest one.