USB_GET_CURRENT_FRAM(9) USB Core APIs USB_GET_CURRENT_FRAM(9)NAME
usb_get_current_frame_number - return current bus frame number
SYNOPSIS
int usb_get_current_frame_number(struct usb_device * dev);
ARGUMENTS
dev
the device whose bus is being queried
RETURN
The current frame number for the USB host controller used with the given USB device. This can be used when scheduling isochronous requests.
NOTE
Different kinds of host controller have different "scheduling horizons". While one type might support scheduling only 32 frames into the
future, others could support scheduling up to 1024 frames into the future.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_GET_CURRENT_FRAM(9)
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usb_get_current_frame_number(9F) Kernel Functions for Drivers usb_get_current_frame_number(9F)NAME
usb_get_current_frame_number - Return current logical usb frame number
SYNOPSIS
#include <sys/usb/usba.h>
usb_frame_number_t usb_get_current_frame_number(dev_info_t *dip);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI)
PARAMETERS
dip Pointer to the device's dev_info structure.
DESCRIPTION
The usb_get_current_frame_number() function retrieves the current logical USB frame number.
Isochronous requests can be started on a particular numbered frame. An offset number of frames (typically between 4 and 10) can be added to
the current logical frame number to specify the number of an upcoming frame to start an isochronous request.
The USB specification requires that the frame frequency (the period between start-of-frame packets) is one millisecond. The Solaris oper-
ating environment USB implementation uses a running counter of the number of milliseconds since boot as the current logical frame number.
RETURN VALUES
On success, the usb_get_current_frame_number() function returns the current USB frame number. On failure it returns 0. The function fails
if dip is NULL.
CONTEXT
May be called from user, kernel or interrupt context.
EXAMPLES
usb_pipe_handle_t handle;
usb_frame_number_t offset = 10;
usb_isoc_req_t *isoc_req;
isoc_req = usb_alloc_isoc_req(...);
...
...
isoc_req->isoc_frame_no = usb_get_current_frame_number(dip) + offset;
isoc_req->isoc_attributes = USB_ATTRS_ISOC_START_FRAME;
...
...
if (usb_pipe_isoc_xfer(handle, isoc_req, 0) != USB_SUCCESS) {
...
}
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Architecture |PCI-based systems |
+-----------------------------+-----------------------------+
|Interface stability |Committed |
+-----------------------------+-----------------------------+
|Availability |SUNWusb |
+-----------------------------+-----------------------------+
SEE ALSO attributes(5), usb_alloc_isoc_req(9F), usb_get_max_pkts_per_isoc_request(9F), usb_pipe_isoc_xfer(9F), usb_pipe_get_max_bulk_trans-
fer_size(9F), usb_isoc_request(9S)SunOS 5.11 25 July 2004 usb_get_current_frame_number(9F)
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