USB MSC example in interrupt mode

RE: USB MSC example in interrupt mode

Duy — Sat, 28 Dec 2019 06:49:06 GMT

Hello,

I got the same issue and I made it run by the following lines of code. I have no idea why. I am using SDK 15.3 also.

/**@brief Function for initializing the usbd. */
static void usbd_init(void)
{
    static const app_usbd_config_t usbd_config = 
    {
        .ev_state_proc = usbd_user_ev_handler
    };

    app_usbd_serial_num_generate();
       
    ret_code_t err_code = app_usbd_init(&usbd_config);
    APP_ERROR_CHECK(err_code);    
}


static void usbd_start()
{
    ret_code_t err_code;

    app_usbd_class_inst_t const * class_cdc_acm = app_usbd_cdc_acm_class_inst_get(&m_app_cdc_acm);
    err_code = app_usbd_class_append(class_cdc_acm);
    APP_ERROR_CHECK(err_code);

    if (USBD_POWER_DETECTION)
    {
        err_code = app_usbd_power_events_enable();
        APP_ERROR_CHECK(err_code);
    }
    else
    {
        NRF_LOG_INFO("[USB]No USB power detection enabled\r\nStarting USB now");

        app_usbd_enable();
        app_usbd_start();
    }
}


int main(void)
{
    ret_code_t err_code;

    // Initialize.
    log_init();
    clock_init();
    timers_init();
    uart_init();
    buttons_leds_init();
    usbd_init();
    // It does not work if the function usbd_start() is here.
    //usbd_start();

    db_discovery_init();
    power_management_init();
    ble_stack_init();
    gatt_init();
    nus_c_init();
    scan_init();

    // Start execution.
    // It works if the function usbd_start() is here
    usbd_start();
    // Do manythings here
    
        printf("BLE UART central example started.\r\n");
    NRF_LOG_INFO("BLE UART central example started.");
    scan_start();

    // Enter main loop.
    for (;;)
    {
//        while (app_usbd_event_queue_process())
//        {
//            /* Nothing to do */
//        }

    }
    
}

Best regards,

Duy

RE: USB MSC example in interrupt mode

ebray — Tue, 23 Jul 2019 14:18:13 GMT

No, because the QSPI flash is the only "drive" that is configured to work with FatFS. Also, it works fine in polling mode.

RE: USB MSC example in interrupt mode

Edvin — Tue, 23 Jul 2019 14:04:14 GMT

[quote user="ebray"]Odd. The link still works fine for me. If you search for the text below in the forum you can find the post that way.[/quote]

Sorry. I meant that they didn't find the cause of the issue.

[quote user="ebray"]It seems to get hung up waiting for the QPSI to become not busy but that never occurs.[/quote]

Have you tested the example without the QSPI part? Or you can try to turn off and on the power register on the QSPI like described in the workaround here.

RE: USB MSC example in interrupt mode

ebray — Tue, 23 Jul 2019 13:06:44 GMT

It appears that the real issue is that when the USB is disconnected the fatfs_init call never returns. It seems to get hung up waiting for the QSPI flash to become not busy but that never occurs.

RE: USB MSC example in interrupt mode

ebray — Tue, 23 Jul 2019 12:30:39 GMT

Odd. The link still works fine for me. If you search for the text below in the forum you can find the post that way.

usb-cdc-acm-example-is-not-working-in-interrupt-mode

Thank you for testing and verifying the behavior on the MSC example. Since it works properly for the CDC example I'm assuming it's either a bug or a configuration issue as I wouldn't think there should be any difference in the USBD user events generated.

RE: USB MSC example in interrupt mode

Edvin — Tue, 23 Jul 2019 09:26:52 GMT

Hello,

I see that the thread that you link to died. I have tested, and I see the same behavior as you, but I am not certain that the interrupt handler handles all the events correctly, as it does when you use the event queue. I have asked our SDK team if they can take a look at what you would need to do to use this mode. I will let you know as soon as I know something.

Best regards,

Edvin