USB_MsgOp (SWI&55399)
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Chapter 2. Core SWI Calls
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Name
USB_MsgOp (SWI&55399) — Message operations
On Entry
R0
Value
Definition
Description
0
USB_MSGOP_NONE
1
USB_MSGOP_REGISTER
2
USB_MSGOP_DEREGISTER
3
USB_MSGOP_FILTER
4
USB_MSGOP_FILTERALL
R1
Pointer to message handler
R2
Parameter to message handler
R3
Message class
R4
0 disable - 1 enable
R5
On Exit
R0
preserved
R1
Error code
Table A.1
R2, R3, R4, R5
Preserved
Use
Related SWI's
USB_MsgSend (SWI&55398)