https://devzone.nordicsemi.com/f/nordic-q-a/68957/qspi-problem-with-nusHi everybody, I think have a problem which involve writing on the external memory of the nrf52840, what I want is when I receive data from the NUS service I want to store it on the external memory. But I encountered an issus with the reading I alwaysen-USTelligent Community 13Wed, 02 Dec 2020 10:56:30 GMThttps://devzone.nordicsemi.com/thread/282852?ContentTypeID=1Wed, 02 Dec 2020 10:56:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:916b115c-d5b0-4159-97c9-b5e832f89ac0TermiteUser<p>It&#39;s working now, you were right that was the problem</p> <p>Thanks a lot !&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/282832?ContentTypeID=1Wed, 02 Dec 2020 09:48:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9419839a-4428-430f-a15c-c23aff7cc6beTermiteUser<p>Hi,</p> <p>I see the problem, I will try your solution and give you an update.</p> <p>Thanks for the reply&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/282829?ContentTypeID=1Wed, 02 Dec 2020 09:37:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6c0fa274-3b0c-40ee-8168-a5e726c7593bJ&#248;rgen Holmefjord<p>Hi,</p> <p>My guess is that the QSPI peripheral runs at a lower priority than the nus_data_handler, which prevents it from writing the data to the flash before you try to read it back.</p> <p>I would highly recommend that you move large processing tasks like this outside of the interrupt/event handlers, for instance by setting a flag in the handler and process the task in main-loop, or use the <a title="Schedule handling library" href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/lib_scheduler.html?cp=7_1_3_41">Schedule handling library</a>.</p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>