RE: USB disconnect causing system reset

Mihal — Thu, 14 Nov 2019 22:11:32 GMT

hi. looks like i have a similar problem on SDKv15.2

NRF_DRV_POWER_EVT_DETECTED is presented and i can process it BUT only when firmware is active.

my code is super simple.

switch (event)
{
case NRF_DRV_POWER_USB_EVT_DETECTED:
    NRF_LOG_INFO("USB power detected");
    if (!nrf_drv_usbd_is_enabled()) {
        if ( !POWER_ON() ) sleep_mode_enter();
    }
    break;
case NRF_DRV_POWER_USB_EVT_REMOVED:
    NRF_LOG_INFO("USB power removed");
    if (!nrf_drv_usbd_is_enabled()) {
    if ( true ) sleep_mode_enter();
    }
break;
default:
}

it supposed to check whether program have been already running before the event.

NRF_DRV_POWER_USB_EVT_DETECTED works perfect

but NRF_DRV_POWER_USB_EVT_REMOVED can not be processed from sys_off even if there is always true as i put in example

UPD: your link in a comment above is broken

RE: USB disconnect causing system reset

Kenneth — Wed, 19 Sep 2018 11:43:27 GMT

Hello, can this be the case: https://infocenter.nordicsemi.com/topic/errata_nRF52840_Rev1/ERR/nRF52840/Rev1/latest/anomaly_840_197.html?cp=4_0_1_2_1_29

Also please update to SDKv15.2 for various bug fixes.