hi,
Looks like it is almost working :)
Román wrote:
> .stream = {
> .type = USB_ISOC,
> .count = 6,
> .endpoint = 0x81,
> .u = {
> .isoc = {
> .framesperurb = 1,
> .framesize = 564,
> .interval = 150,
> }
> }
> },
>
>
> Be aware that lsusb -v (without ehci_usb) lists 1023 as the maximum
> packet size, as opposed to 564 (the value with ehci_usb loaded), but
> changing that parameter didn't make any difference. Also note the
> value in .interval: I only got some success with values between 100
> and 200, approximately. I'm not an expert but they seem very strange
> values to me. Didn't have any success at all with ehci_usb loaded.
There is not many drivers using isoc currently, only au6610 and ttusb2.
When I did au6610 it was was also hard to guess those values. I don't
know whats the "correct" way to find values, but here is method I used
(au6610.c):
.framesperurb = 40,
from usbsnoop.log
NumberOfPackets = 00000028
.framesize = 942,
from lsusb
wMaxPacketSize 0x03ae 1x 942 bytes
or from usbsnoop.log
IsoPacket[1].Offset = 942
.interval = 1.25, /* 125 us */
Interface[0]: Pipes[1] : Interval = 0x00000001
Interface[0]: Pipes[1] : PipeType = 0x00000001
(UsbdPipeTypeIsochronous)
I don't remember where I found 125 us, maybe looking times from
usbsnoop.log. Anyhow, looks like it is wrong but still works just fine
because 1.25 is rounded to 1 due to integer.
I hope this helps :)
regards
Antti
--
http://palosaari.fi/
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