Tom,
Would you please show me how did you get bmRequestType to value 0xC2.
Many thanks.
John
On Mon, Jul 16, 2012 at 5:37 PM, Tim Roberts <t...@probo.com> wrote:
> John Chen wrote:
>
>
> I need to convert a legacy app from win api calls to libusbx, most of the
> legacy app is using DeviceIoControl , from libusbx docs, the I believe I
> need to use libusb_control_transfer, but I am not sure how to change the
> calls from DeviceIoControl calls to libusb_control_transfer as
> the parameters for those api are total different.
>
> Would anyone give me some advice how to do that? maybe some examples?
>
>
> Honestly, you should be able to figure this out on your own. Did you even
> notice that the parameter names in the VENDOR_OR_CLASS_CONTROL_REQUEST
> structure are exactly the same as the parameter names to libusb?
> RequestType, Request, Index, Value? A few minutes reading would tell you
> how to combine direction, recipient and request type into the bmRequestType
> field for control requests, but I will tell you that a device-to-host
> vendor request to an endpoint has a bmRequestType of 0xC2.
>
> When you use libusbx, you are writing a driver. It may not feel like it,
> but it is a driver. You need to understand something about USB in order to
> drive a USB device, and right now you don't seem to have that.
>
>
>
> Below is some of our legacy calls in window api.
>
>
> No, this is exactly one legacy call.
>
>
>
> {
> enError = SendVendorRequest(
> VENDOR_REQUEST_DIRECTION_DEVICE2HOST, // direction
> VENDOR_REQUEST_REQUESTTYPE_VENDOR, // request type
> VENDOR_REQUEST_RECEPIENT_ENDPOINT, // recipient
> VR_I2C_COMMAND, // request
> c_usDeviceId, // device id
> c_usOffset, // offset
> c_uiLength, // size
> reinterpret_cast<UCHAR*>(pszAssNum)); // buffer
>
>
> bmRequestType = 0xC2
> bRequest = VR_I2C_COMMAND
> wValue = c_usDeviceId
> wIndex = c_usOffset
> length = c_uiLength
>
> You should be able to figure the parameters out from that.
>
> --
> Tim Roberts, t...@probo.com
> Providenza & Boekelheide, Inc.
>
>
>
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