Hi all
I want to get the usb printer 's device_id_string, by sending the request:
usb_control_msg(usbdev,
0xa1, //request type
0, //request
0, //wvalue
0, //wIndex
deviceid, //string
contains the id string
sizeof(deviceid), //size
1000 //timeout
);
but it faild by return the errno 16 which shows that the device or source busy.
I only open the device and then do this control, why it complains that device
busy?
Thanks in advance!
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