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USB composite cdc msc OUT io trouble

Question asked by Ole Ho on Feb 27, 2018

Hey. STM32F746 device transmits constant lenght-garbage bytes from a cdc device while working in composite with MSC interface as well. While enumeration, receiving and SCSI functions work perfectly fine, device sends 4 bytes of some shifting sequence on each HAL call. Where should I move next? Any insight hirely appreciated.