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STM32F3 USB as Virtual Comm port

Question asked by fox.matthew on Jan 28, 2014
I'm working on an STM32F373C8.  I've been working a lot with the usb as a virtual comm port and I haven't had any problems.  However, I'm currently working on an application where I only have the microcontroller sending information over USB back to a server, and no communication the other way.  As of right now, I'm getting into this loop, but then usb_packet_sent never becomes true again:

if( usb_packet_sent == 1 ){
     CDC_Send_DATA(usart1_rx_buffer.databuffer, usart1_rx_buffer.length);

Has anyone ever encountered this?  I'm not doing anything differently in my code other not receiving packets via usb.  Thanks in advance for any help!