On Sun, 16 Feb 2014, vichy wrote:
> it makes me a little confused.
> if we try to send 108 bytes to FS iso ep over HS hub.
> shouldn't we use below formula to calculate what bus time need for?
> NS_TO_US (think_time + usb_calc_bus_time (
> dev->speed, is_input, 1, 108));
That
hi alan:
2014-02-14 23:36 GMT+08:00 Alan Stern :
> On Fri, 14 Feb 2014, vichy wrote:
>
>> hi Alan:
>>
>> > I don't understand your question.
>> >
>> > At full speed (12 Mb/s), the time required to transfer 188 bytes is
>> >
>> > (188 bytes) * (8 bits/byte) / (12 b/us) = 125.33 us,
>> >
>>
On Fri, 14 Feb 2014, vichy wrote:
> hi Alan:
>
> > I don't understand your question.
> >
> > At full speed (12 Mb/s), the time required to transfer 188 bytes is
> >
> > (188 bytes) * (8 bits/byte) / (12 b/us) = 125.33 us,
> >
> > which is greater than 125 us.
>
> @@ -1412,7 +1412,7 @@ si
hi Alan:
> I don't understand your question.
>
> At full speed (12 Mb/s), the time required to transfer 188 bytes is
>
> (188 bytes) * (8 bits/byte) / (12 b/us) = 125.33 us,
>
> which is greater than 125 us.
@@ -1412,7 +1412,7 @@ sitd_slot_ok (
*/
uf = uframe & 7;
On Mon, 10 Feb 2014, vichy wrote:
> >> 2. in tt_available, below is used to check whether tt time is bigger than
> >> 125us
> >> if (125 < usecs) {
> >> int ufs = (usecs / 125);
> >> int i;
> >> for (i = uframe; i < (uframe + ufs) && i < 8; i++)
> >>
hi Alan:
2014-02-07 23:40 GMT+08:00 Alan Stern :
> On Fri, 7 Feb 2014, vichy wrote:
>
>> Hi Alan:
>>
>> 2014-01-31 2:23 GMT+08:00 Alan Stern :
>> > On Fri, 31 Jan 2014, vichy wrote:
>> >
>> >> Hi all:
>> >> I have some questions ab
On Fri, 7 Feb 2014, vichy wrote:
> Hi Alan:
>
> 2014-01-31 2:23 GMT+08:00 Alan Stern :
> > On Fri, 31 Jan 2014, vichy wrote:
> >
> >> Hi all:
> >> I have some questions about bandwidth calculation
> >> 1. why tt time need to include one maxp bus
Hi Alan:
2014-01-31 2:23 GMT+08:00 Alan Stern :
> On Fri, 31 Jan 2014, vichy wrote:
>
>> Hi all:
>> I have some questions about bandwidth calculation
>> 1. why tt time need to include one maxp bus time ?
>> qh->tt_usecs = NS_TO_US (think_time +
>>
On Fri, 31 Jan 2014, vichy wrote:
> Hi all:
> I have some questions about bandwidth calculation
> 1. why tt time need to include one maxp bus time ?
> qh->tt_usecs = NS_TO_US (think_time +
> usb_calc_bus_time (urb->dev->speed,
>
Hi all:
I have some questions about bandwidth calculation
1. why tt time need to include one maxp bus time ?
qh->tt_usecs = NS_TO_US (think_time +
usb_calc_bus_time (urb->dev->speed,
is_input, 0, max_packet (maxp)));
2. in tt_available,
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