USB_MsgOp (SWI&55399)

USB_MsgOp (SWI&55399)
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USB_MsgOp (SWI&55399) — Message operations

On Entry

Value	Definition	Description
0	USB_MSGOP_NONE
1	USB_MSGOP_REGISTER
2	USB_MSGOP_DEREGISTER
3	USB_MSGOP_FILTER
4	USB_MSGOP_FILTERALL	All messages are filtered The messgae class in R3 is ignored

Pointer to message handler

Parameter to message handler

Message class

0 = message class will not be passed to the caller

1 = message class will be passed to the caller

R0	0 on succesful completion 1 if failed
R1	Error code Table A.1, “Error codes used by the USB system”
R2, R3, R4, R5	Preserved