Silicon Laboratories Stepper Machine Specifications download pdf (Page 36)

Standard Requests Example

 Get_Descriptor(DEVICE): Standard request to get the device descriptor

bmRequestType = 80h, bRequest = 06h

(Get_Descriptor())

wValue = 0100h (DEVICE)

wIndex = 0000h

wLength = 0012h (18 bytes)

bmRequestType=00h, bRequest=05h

(Set_Address())

wValue = 0300h (Address 3)

wIndex = 0000h

wLength = 0000h (0 bytes)

Set_Address(3): Standard request to set device address to 3.

8 bytes of data found within the setup

phase of the control transfer.

Here are some captures of data highlighting the requests. The first is the

Get_Descriptor(DEVICE) standard request and the second is the Set_Address(3)

request. In the first example we would provide the USB peripheral with the data

that is stored that conforms to the descriptors for the device descriptor. When we

receive the second request we will update the address register with the value

transferred by the host, in this case we would become address 3.

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Silicon Laboratories Stepper Machine Specifications Page 36