Hang when sending particular numbers of bytes

[xenovacivus]

Copied from http://www.coocox.org/forum/topic.php?id=3601:

There is one problem with this project. It works fine and I've used it in my project but sometimes the reading of data at the host side hunged up. It was because It doesn't include this fix:

https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=%2fpublic%2fSTe2ecommunities%2fmcu%2fLists%2fcortex_mx_stm32%2fUSB%20CDC%20Device%20hung%20fix&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=75

It causes that if it happens that the number of characters sent to the host ist even multiplictaion of CDC_DATA_IN_PACKET_SIZE then the PC doesn't detect end of transmission correctly. So if you intend to use this example to exchange large amount of data then apply the fix that is given in the link above.