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STM32f407 isoc transfer was reduced

Question asked by replicater on Aug 2, 2015
Latest reply on Aug 31, 2015 by Amel N
Hello all!
I use STM32F4Discovery (embedded code based on HAL v1.6.0) paired with libusbk. To switch on/off the isochronous IN transfer over EP2 i send commands (control transfer) to EP0. The maximum size of EP2 packet was set to 864 bytes. I modified a standart example (Read.Isochronous written on C#), wich enabled receiving the data from device. After the program was runned first time, the data was received correctly. All transfers was with 864 bytes length. But all other execution of program was bring that all packets are reduced to latest 4 bytes (aligned to four bytes size). I attach the USBlyzer report below.
USBlyzer report

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