Hello friends. I use STM32F303 discovery, and trying write code for usb cdc virtual com port, low level, registers only. 3 endpoints, 1st interrupt IN, 2nd bulk IN, 3th bulk OUT. I make it work, but have a problem with receiving endpoint 3, usb peripherial dont full rx_buffer (64 bytes), he update CTR_RX after each received byte, in this way i have always 1 received byte in PMA buffer..last one. Any suggestions? Tnx.