Gazell Host Callback function not being call back when USB turn into suspend

RE: Gazell Host Callback function not being call back when USB turn into suspend

buglovebug — Mon, 22 Jul 2024 09:15:46 GMT

Hi, Kenneth, Pls allow me to jump in, if gzll not initiated right after USB_init(), bss above discussions, it is good to run nrf_drv_clock_hfclk_request(NULL); before gzll initializaion?

RE: Gazell Host Callback function not being call back when USB turn into suspend

Brian_Chen — Wed, 23 Aug 2023 11:49:02 GMT

It works, thanks!

RE: Gazell Host Callback function not being call back when USB turn into suspend

Kenneth — Wed, 23 Aug 2023 10:54:33 GMT

Can you try a different workaround:

After calling app_usbd_init() in main, can you add following line:

nrf_drv_clock_hfclk_request(NULL);

I believe this should ensure hfclk is running.

Kenneth

RE: Gazell Host Callback function not being call back when USB turn into suspend

Brian_Chen — Wed, 23 Aug 2023 10:26:12 GMT

I have check the instructions in app_usbd_suspend_req() and the description of the APP_USBD_EVT_DRV_SUSPEND, both of them indicate that it will release(stop) the hfclk.

So, I add an code in the while loop in mian() function, use an LED to indicate the status of the hfclk (as my laptop is sleeping, I cannot check the Log). the LED indicate when the USB suspend, the hfclk will turn off.

I put nrfx_clock_hfclk_start() just after the app_usbd_suspend_req(). the problem is solved, but I don't know if there are any problems may caused by the restart of the hfclk.

RE: Gazell Host Callback function not being call back when USB turn into suspend

Kenneth — Wed, 23 Aug 2023 08:25:57 GMT

Sounds like you are closing on to the problem yes, how/where did you find that hfclk is stopped?

Kenneth

RE: Gazell Host Callback function not being call back when USB turn into suspend

Brian_Chen — Wed, 23 Aug 2023 04:26:02 GMT

I have noticed that, the problem is because the APP_USBD_EVT_DRV_SUSPEND event will turn off the hfclk, and the gzll timer is not function. Is there anyway to keep hfclk active when APP_USBD_EVT_DRV_SUSPEND event happened?

RE: Gazell Host Callback function not being call back when USB turn into suspend

Brian_Chen — Tue, 22 Aug 2023 13:41:54 GMT

Hi,

Yes, the usbd_user_ev_handler will go APP_USBD_EVT_DRV_SUSPEND event. I just copy this part fo code from the SDK keyboard example. I have tried to remove the app_usbd_suspend_req(), but the gzll device still cannot communicate with the host.

regards,

Letian.

static void usbd_user_ev_handler(app_usbd_event_type_t event)
{
    switch (event)
    {
    case APP_USBD_EVT_DRV_SOF:
        break;
    case APP_USBD_EVT_DRV_SUSPEND:
        app_usbd_suspend_req(); // Allow the library to put the peripheral into sleep mode
        // bsp_board_leds_off();
        break;
    case APP_USBD_EVT_DRV_RESUME:
        // LED_On(BSP_LED_3);
        //  kbd_status(); /* Restore LED state - during SUSPEND all LEDS are turned off */
        break;
    case APP_USBD_EVT_STARTED:
        // LED_On(BSP_LED_3);
        break;
    case APP_USBD_EVT_STOPPED:
        app_usbd_disable();
        break;
    case APP_USBD_EVT_POWER_DETECTED:
        NRF_LOG_INFO("USB power detected");

        if (!nrf_drv_usbd_is_enabled())
        {
            app_usbd_enable();
        }
        break;
    case APP_USBD_EVT_POWER_REMOVED:
        NRF_LOG_INFO("USB power removed");
        app_usbd_stop();
        break;
    case APP_USBD_EVT_POWER_READY:
        NRF_LOG_INFO("USB ready");
        app_usbd_start();
        break;
    default:
        break;
    }
}

RE: Gazell Host Callback function not being call back when USB turn into suspend

Kenneth — Tue, 22 Aug 2023 13:15:47 GMT

Hello,

What is the implementation of usbd_user_ev_handler? Likely you are going to system off mode or similar on APP_USBD_EVT_DRV_SUSPEND event.

Kenneth