JP1 Remotes

vickyg2003 · Posted: Wed Jul 04, 2012 8:14 am Post subject:

Your right. I miscalculated the third byte of fixed data.
That's what I get for taking a short cut. I picked 10 up as the device, and stuck it in as that byte without ever decoding that portion by hand, and without thoroughly understanding the Kaisekyo protocol as to where the device would be in the code. X:4,D:4, I just assumed the whole byte would be the device of 10 and I was getting a bit lost when I reached the middle of the signal from either end. I made the same mistake on NoirFire's Skyperfect when I plugged in 8 for the device and it should have been 128. At that time I just chalked it up to a typo, where I should have looked deeper into the decode and I would have seen that I made the same error there.

Sky perfect
01000101 162
01010100 42
00000001 128
11101000 23

desired xor with function
11101001

1000 0000 0101 0101 1000 0101 0100 1000 1100 0000 1101 1000 IRscope from Alan

Humax - Alan
10000000 1
01010101 170
10001010 X4:1, d4:10
01001000 18

desired xor with function to get final bit
00011000

But I don't see how xoring bytes 1 to 4 would get you the '00011000' to xor with bit 5 to get the xsum we are looking for.
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The Robman · Posted: Wed Jul 04, 2012 8:30 am Post subject:

Neither of those XOR groups give the desired result

The Robman · Posted: Wed Jul 04, 2012 8:51 am Post subject:

I just used the Pronto export function to get the binary signals for the Humax, and if you XOR the 1st 4 bytes you do get the desired 00011000 pattern.

vickyg2003 · Posted: Wed Jul 04, 2012 8:59 am Post subject:

The Robman · Posted: Wed Jul 04, 2012 9:17 am Post subject:

so, bottom line, the xsum pattern for the Skyperfect is an XOR of bytes 3 and 4, whereas for the Humax it's an XOR of all 4 fixed bytes. Therefore I agree with Dave that the custom executor should use a seeding byte rather than calculate the pattern.

The seeding byte for Skyperfect should be 11101001 and for Humax it should be 00011000, then XOR this byte with the OBC byte to generate the checksum. Also, don't accidentally include the seeding byte in the signal. My recommendation would be to make the seeding byte the 5th fixed byte, then in the code do this...

1) save the 5th byte (the seed) in a scratch register
2) load the 6th byte (obc) into the 5th byte
3) XOR the saved seed with the 6th byte (obc) to generate the xsum

here's a spreadsheet with both sets in it
http://www.hifi-remote.com/forums/dload.php?action=file&file_id=11054
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Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help!

The Robman · Posted: Wed Jul 04, 2012 9:32 am Post subject:

vickyg2003 · Posted: Wed Jul 04, 2012 9:35 am Post subject:

3FG · Expert Joined: 19 May 2009 Posts: 3367

Vicky,
I see that the SkyPerfect upgrade you made for noifire sets up 3 repeats. Maybe that's necessary for a Slingbox, but I suppose that a general upgrade wouldn't need a special number of repeats. So I guess that for most users, a custom executor isn't needed, and the 00C9 Panasonic executor will work with OEM1=162, OEM2 = 42, Dev = 128, and Sub = 23. It would save 36 bytes.

vickyg2003 · Posted: Wed Jul 04, 2012 11:31 am Post subject:

The Robman · Posted: Wed Jul 04, 2012 1:00 pm Post subject:

The Robman · Posted: Wed Jul 04, 2012 1:27 pm Post subject:

As Panasonic also uses a XOR of the 3rd and 4th bytes, you should be able to use the Panasonic entry in RM "as is" for the Skyperfect, if you supply OEM1=162 and OEM2=42.

For the Humax, we would need a new protocols.ini entry that does an XOR of all 4 fixed bytes. Here's my guess as to what that entry would look like...

The Robman · Posted: Wed Jul 04, 2012 1:51 pm Post subject:

Here's an upgrade for the Skyperfect that uses the Panasonic executor:
http://www.hifi-remote.com/forums/dload.php?action=file&file_id=11057

and here's one for the Humax that uses the new protocols.ini entry (above)
http://www.hifi-remote.com/forums/dload.php?action=file&file_id=11058

both upgrades are completely un-tested, so any feedback would be appreciated.
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Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help!

3FG · Expert Joined: 19 May 2009 Posts: 3367

Rob,
I guess I wasn't clear enough. The 00C9 executor will work for the SkyPerfect. But the executor, as implemented in the RCRP05B, and I suspect other remotes, won't work for the Humax because it doesn't actually use the seed byte. It seems to be hard coded to take the XOR of the 3rd and 4th byte.

The Robman · Posted: Wed Jul 04, 2012 1:55 pm Post subject:

Right, but the version in most remotes, including the Slingbox, should work.
_________________
Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help!

vickyg2003 · Posted: Thu Jul 05, 2012 7:02 am Post subject:

Gee, while I was gone to one event, you guys went and had all the fun!