USB Custom Class

Dear All,

I use STM32F103VB MCU on my project, I do test some examples on MDK V5.10 and acquire some knowledge (surely not enough as an expert).
Anyway, I try to write custome class USB Device with EP1 as bulk out and bulk in, EP2 as bulk in,
but I where unsuccessful to pass on.
I found that I should write code under USBD_CustomClass0_endpoint1_Event(...) and USBD_CustomClass0_endpoint2_Event(...) routines, but data sequences/length missed and make me confused.

Is there any knowledge which I missed ?
Is there any example to make me help ?

Best regards

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