USB_CALC_BUS_TIME
Section: (9)
Updated: 09 October 2005
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NAME
usb_calc_bus_time - approximate periodic transaction time in nanoseconds
SYNOPSIS
"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.
Index
- NAME
-
- SYNOPSIS
-
- ARGUMENTS
-
- DESCRIPTION
-
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Time: 00:02:56 GMT, October 09, 2005