https://devzone.nordicsemi.com/f/nordic-q-a/61547/a-problem-about-stop-sd-stack-in-usb-and-ble-projecthi ,when develop the usb + gzll+ble hid funcation, i find that it will occur a erro when stop the ble stack in the project that have usb funcation,so i try in the project : nordic sdk\nRF5_SDK_16.0.0_98a08e2\examples\peripheral\usbd_ble_uart like tisen-USTelligent Community 13Tue, 19 May 2020 08:59:27 GMThttps://devzone.nordicsemi.com/thread/250630?ContentTypeID=1Tue, 19 May 2020 08:59:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f5c5dd8d-7cbe-481a-a91c-d1396ffc05c5pipixia_8_8<p>i have slove this problem,it is because the api&nbsp;void idle_state_handle(void).if the power_manage() in the api,this problen will occur，because it is relative with sd.</p><div style="clear:both;"></div>