USB_CALC_BUS_TIME

Section: (9)
Updated: 17 July 2003
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NAME

usb_calc_bus_time - approximate periodic transaction time in nanoseconds

SYNOPSIS

long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount);

ARGUMENTS

speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
is_input: true iff the transaction sends data to the host
isoc: true for isochronous transactions, false for interrupt ones
bytecount: how many bytes in the transaction.

DESCRIPTION

Returns approximate bus time in nanoseconds for a periodic transaction. See USB 2.0 spec section 5.11.3; only periodic transfers need to be scheduled in software, this function is only used for such scheduling.

ABOUT THIS DOCUMENT

This documentation is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

For more details see the file COPYING in the source distribution of Linux.

If you have comments on the formatting of this manpage, then please contact Michael Still (mikal@stillhq.com).

This documentation was generated with kernel version 2.5.71.

This document was created by man2html, using the manual pages.
Time: 02:18:37 GMT, July 17, 2003