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Похоже, что можно прописать UARTy (под WIN)
регистр FIFO:IOCTL_SERIAL_SET_FIFO_CONTROL
Operation
The IOCTL_SERIAL_SET_INFO_CONTROL request sets the FIFO control register (FCR). Serial does not verify the specified FIFO control information.Input
The AssociatedIrp.SystemBuffer member points to a client-allocated ULONG that is used to input FIFO control information.The Parameters.DeviceIoControl.InputBufferLength is set to the size in bytes of a ULONG.
Output
NoneI/O Status Block
The Information member is set to zero.The Status member is set to one of the Generic Status Values for Serial Device Control Requests.
Headers
Defined in ntddser.h. Include ntddser.h.
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