USBLib_SetURB (SWI &56361)

USBLib_SetURB (SWI &56361)
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USBLib_SetURB (SWI &56361) — Sets values in a URB

On Entry

Pointer to URB

bits to flag item to set

0 = number of bytes of used data

1 = pointer to the data

2 = total size

3-31 = reserved and should be 0

used size (only used if bit 0 is set)

pointer to data (only used if bit 1 is set)

total size (only used if bit 2 is set)

On Exit

R0 - R4

Preserved

Use

This call allows a driver to change fields in a URB without a driver directly accessing the URB structure. Its main use is to change the used size parameter to vary the amount of data sent in a transaction.

Note

The total size parameter must only be used if the URB is pointing to external data.

Related SWIs

USBLib_URBInfo (SWI &56360)

Related Information

Chapter 5, Data Buffers