[mythtv-users] direct usb-usb cable to replace usb-uirt
Dan Wilga
mythtv-users2 at dwilga-linux1.amherst.edu
Fri Oct 30 17:16:33 UTC 2009
At 4:08 PM +0100 10/30/09, Marius Schrecker wrote:
>I figured the actual signal would be different from what lirc would
>transmit, bu tif I plug a UIRT into my Linux box, and cat what comes
>in over the /dev/ node, I should be able to see what my STB would
>expect to receive.
No, not likely, IMHO. The UIRT talks to the Linux box using a
proprietary (but documented) protocol, which encapsulates the IR
pulses. The STB most likely uses another protocol entirely to talk on
its USB port. It's very unlikely that it uses a protocol that
resembles either raw IR pulses or what the UIRT uses.
It's most likely that the STB uses a protocol that says, "tune to
channel 1-2-3". Contrast that with the USB_UIRT protocol, which says,
"I got a series of IR pulses in this on-off sequence," or, "I got a
series of IR pulses that I recognize as this remote control
keypress." (This latter mode of the UIRT isn't actually used in
LIRC.) In short, the STB likely talks in channel numbers, whereas the
UIRT talks in pulses and keypresses. It's apples and oranges.
Try taking your STB's model name/number and Googling it with "USB
tune" to see what you get. You might be surprised.
--
Dan Wilga "Ook."
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