USBLib_CtrlMsg (SWI &5635E)

USBLib_CtrlMsg (SWI &5635E)
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USBLib_CtrlMsg (SWI &5635E) — Starts a transaction using a formatted control message.

On Entry

R0	pipe
R1	Data URB (0 if no data to be transfered)
R2	Message URB
R3	waiting template
R4	bmRequestType (8bit)
R5	bRequest (8bit)
R6	wValue (16bit)
R7	wIndex (16bit)

On Exit

R0	waiting
R1,R2,R3,R4,R5,R6,R7	Preserved

Use

This call starts a USB control transaction by taking the supplied values and creating the properly formatted control message in the supplied URB (R2) then starting a transaction with the appropriate parameters.

Related SWIs

USB_RequestStart (SWI&5538F)

Related Information

Section 7.2.1, “Control transactions”

usb_request_start