En/na Manu Abraham ha escrit:
Ok, now I have that document, and that page refers to firmware
downloading in MPEG TS mode, in usb mode the procedure is different
(however it is documented with source code).
There is a nice picture of the USB mode on page 45
Well, I can already successfully download the firmware.
A picture is worth a thousand words, but a thousand lines of sample code
is worth more than a picture ;-)
I made some sniffing and I can see that the firmware downloading is done
according to the example software, but in the capture file I see some
things that aren't documented.
Now comes the question:
0)everything (commands, replies, ts data) is done with bulk transfers
1)all commands are sent on endpoint 2
2)to each command corresponds a reply that comes through endpoint 1 (but
usbsnoop identifies it as endpoint 0x81)
3)what appears to be TS data comes through endpoint 4 (0x84 in usbsnoop)
The fact that commands and replies are on 2 different endpoints means
that I cannot use dvb_usb_generic_rw/dvb_usb_generic_write, yes, no, or
am I just being stupid?
will take a look in there.
I already did: dvb_usb_generic_rw uses the same endpoint for writing and
reading, so I just made my private functions that do the same but using
endpoint 2 for writing and 1 for reading.
[...]
from pages 29 - 32
Endpoint 0 is the same as defined in USB 1.1 standard.
Endpoint 1 is bulk-in.
Endpoint 2 is bulk-out.
Endpoint 3 is interrupt.
Endpoint 4 is bulk-in.
Endpoint 1 and 2 serve the control messages, while Endpoint 4 serves the
video data packets. Endpoint 3 is reserved and currently not used.
And that happens to be true as well :-)
It was the endpoint reported by usbsnoop (0x81, 0x84) that confused me.
One more question: how do I guess the values for the mpeg data transfer
(apart from the type USB_BULK and the endpoint 0x04)?
I have some captured data if it may help.
Bye
--
Luca
A: Because it destroys the flow of the conversation
Q: Why is it bad?
A: No, it's bad.
Q: Should I top post in replies to mailing lists?
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