high rate ADC sampling error when fstorage erase

[William.wei]

hi support team，

customer have one problem that saadc is high rate sample at about 800hz, it runs ok, but after ble connection and send data to device from mobile device, there will be erase and write operation using fstorage, and this is the time adc dma buffer disorder,

what's strange is that there is only one chance that buffer is not correct, and after the first timer buffer disorder, it will be this state forever(i think after i call fstorag_erase, the buffer will offset for the second time,but it will not)

and i can send the code here,currently i don;t know how to solve this problem. what happens here.

ble_app_uart+adc32.2K.7z

put the demo in \examples\ble_peripheral\.

regards,

william.

[Marjeris Romero]

Hi William,

There is a known issue with swaps/dissorders in the buffer specially after flash writes/reads. Take a look at Jørgens' answer in this case for possible solutions/workarounds: https://devzone.nordicsemi.com/f/nordic-q-a/20291/offset-in-saadc-samples-with-easy-dma-and-ble/79053#79053