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USB Virtual COM port problem on STM32F4

Question asked by lucaV on May 6, 2015
Latest reply on May 29, 2015 by shams.reza
Hi at all,

I'm using a STM32F4 (with HAL libraries) and I have configured the USB as device in order to realize a communication wit the PC through the virtual COM port.

When I send the first packed (from PC to MCU) I have no problem. STM32F4 receives packed and sends the response.
But when I send second one MCU doesn't receives nothing (OTG_FS_IRQHandler is not activated).

Somebody can help me?
Thank you very much 

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