1. NAME▲

usb_calc_bus_time - approximate periodic transaction time in nanoseconds

2. SYNOPSIS ▲

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

3. 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.

4. 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.

5. COPYRIGHT ▲