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ok, i found an halfway solution ! use a kind of TimeOut on the while loop : while ((__USB_DEV_INT_STAT & CCEMTY_INT) == 0 && cpt<5000){ cpt++; }

Hi, I use emUSB 2.20 for a Bulk device on the NXP LPC2368 and it work quite well. But sometimes , the progam stop in Readcmd or Writecmd fonctions (static void _WriteCmdWithData(U32 Cmd, U32 Data) , static unsigned _ReadCmdData(U32 Cmd) ....) at the this line : while ((__USB_DEV_INT_STAT & CCEMTY_INT) == 0); So the on the computer software side it also stop and give an error ! any idea? Thanks Romain