USBD_MSD Disk initialization fails in USB unplug with SDK15.0

Question

After unplugging the USB, disk initialization fails in usbd_user_ev_handler function function (case: APP_USBD_EVT_STOPPED). If I connect and disconnect a second time, it works.

art_art · Accepted Answer

Hi. 
 I had the almost the same issue. After any access to the files via the USB, the file system was demolished after internal flash access. I added additional logs to the SDK in QSPI module and it has shown me, that QSPI uninit function (block_dev_qspi_uninit), called after unplugging the USB, was busy (return with NRF_ERROR_BUSY). 
 I add this code at the beggining of block_dev_qspi_uninit: 
 if ((p_work->state != NRF_BLOCK_DEV_QSPI_STATE_IDLE)) 
 { 
 wait_for_idle(p_qspi_dev); 
 } 
 It fixed the problem. 
 
 Best regards Artur

USBD_MSD Disk initialization fails in USB unplug with SDK15.0

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