STM32F411 In interrupt mode, call usbd_ep_write in the main program

[colorhacker]

In interrupt mode, calling usbd_ep_write in the main program will cause the main program to get stuck and data will never be sent.
ep_write ：
if (ep != 0 && epi->DIEPCTL & USB_OTG_DIEPCTL_EPENA) return -1; // Always returns -1, epi->DIEPCTL & USB_OTG_DIEPCTL_EPENA always is 1

Tracing found that when the main function calls ep_write, the interrupt will generate EP0's ZLP, which will cause the main function's ep_write to be interrupted by EP0's ZLP, and then the data can never be sent.

How can I use the main program to call usbd_ep_write in interrupt mode?

[GrantMTG]

`
#if defined(USBD_USE_IRQ)
USBD_DisableIRQ();
#endif

usbd_ep_write(&udev, MY_IN_EP, In_Packet1, SIZEOF_MYREPORT);

bLoadEp1 = 0; // Prevent more EP1 writes until set=1 by USBD_Ep1EventCb().

#if defined(USBD_USE_IRQ)
USBD_EnableIRQ();
#endif
`