JP1 Remotes

Eric W · Joined: 08 Jun 2004 Posts: 6

Hello All....I'm a newbie so I'm sorry if any of this has been covered before. I've done a bunch of reading but I'm still a little unclear on some stuff. Here is the deal:

I've got a Linux MythTV PVR that has a Nice Tracker Wireless keyboard (http://www.directron.com/ack573.html) hooked to it. I would love to get my Radio Shack 15-2116 remote to emulate some of the keys. The remote is able to learn key-stokes with the IR learn function, but as expected I run out of memory after about 22 keys.

I have my cable and IR up and running, however I'm a bit stumped as to what to do now since I can't seem to find any config info on this site (or anywhere else). When I view the "Learned signals" with IR, most of the buttons only give me raw data without any info in on the top (protocol, device, EFC, etc.). Without the EFC info and such, I'm at a loss.

Am I missing something? Or am I supposed to be stuck here? I was hoping that I could simply do 2 passes at downloading the learned signals and somehow combine them into an upgrade code. I've read the documentation but they I don't think it discuss this.

Any help would be greatly appreciated....thanks in advance!

The Robman · Posted: Tue Jun 08, 2004 10:20 pm Post subject:

Q1. Do the signals that you learned actually work?
Q2. Please post the IR memory file so one of us can take a look at it.

NOTE: Please post a link to the file once you have loaded it, but please read the sticky thread that explains how to post links to Yahoo files first.
_________________
Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help!

Eric W · Joined: 08 Jun 2004 Posts: 6

The Robman · Posted: Wed Jun 09, 2004 11:33 am Post subject:

OK, some quick preliminary research into these signals shows that it uses a tricky format where one of the burst pairs starts with an OFF time (rather than the standard ON time). Just like the last time we saw a signal like this, when the first pair in the stream starts with an OFF time, they insert an extra ON burst between the leadin pair and the first data pair.

Here's my preliminary findings, along with the binary for the 15 buttons learned. At first glance there appears to be a 3 bit device code followed by an 8 bit command code, a 1 bit toggle (that changed for each repetition), then a 4 bit checksum.

leadin = +1800 -1200 (+450)
1 = +450 -600
0 = -600 +450
leadout= -75000

000 00000000 0 0000
000 00000000 1 0001

000 01000000 0 1000
000 01000000 1 1001

000 00100000 0 0100
000 00100000 1 0101

000 01100000 0 1100
000 01100000 1 1101

000 01001000 0 1001
000 01001000 1 1000

000 00110001 0 0101
000 00110001 1 0100

000 01110001 0 1101
000 01110001 1 1100

000 00001001 0 0011
000 00001001 1 0010

000 00010001 0 0001
000 00010001 1 0000

000 01010001 0 1001
000 10000001 1 1111
000 01010001 1 1000

000 01010101 0 0101
000 10000001 1 1111
000 01010101 1 0100

000 00110110 0 1001
000 00110110 1 1000

000 00010111 0 1101
000 00010111 1 1100

000 00001111 0 1111
000 00001111 1 1110

000 00110000 0 0110
000 00110000 1 0111
_________________
Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help!

bwade_913 · Joined: 18 Jan 2004 Posts: 20 Location: Boulder, CO

Eric W · Joined: 08 Jun 2004 Posts: 6

bwade_913 · Joined: 18 Jan 2004 Posts: 20 Location: Boulder, CO

Eric W · Joined: 08 Jun 2004 Posts: 6

Hey Bret,

I'm not sure I will ever totally ditch the keyboard. I think that 95% of the time I will use the remote but occasionally use the keyboard for things like like mythgame. When I finally get a HDTV I'll probably use it to pull up the occasional web site as well and I would use the keyboard then too.

I have an IR sensor working through my PVR 250 card so my remote does work. I've pretty much setup the remote according to Jarod's guide. The reception of that IR sensor is not as good as the sensor that comes with the keyboard....so that is one of my motivations. Additionally, I would like the "cleaner" implementation of just using the keyboard IR receiver for both remote and keyboard but that's just my OCD taking control. Smile

I'm glad to see a fellow MythTV user here though!

Cheers

jon_armstrong · Posted: Thu Jun 10, 2004 3:41 pm Post subject:

Eric,

Give this a try. I think what Rob called a "toggle bit" is a bit set for the key press/release command. The key press is the Zero bit, the key release is One. This is pretty typical of all the keyboards that I have seen. The good news is that that isn't really important. And hard wiring that in a protocol can be counter productive. If you need a ctrl-alt-del you really need the ctrl-press, alt-press, and del-press for it to work

I see this protocol as 17 bits. A start bit (a zero) 15 data bits, and a parity bit as Rob figured out and a stop bit (a One). In Protocol builder I treated it as one bit of fixed data of two 8-bit bytes of variable data and handled the stop bit in the lead-out

This is what the PB protocol looks like in John Fine's new irp format:

{38k}<-624,468|468-624>(1820, -590,0:1:Byte1:8,Byte2:8,442,-75000)

Rather than have the protocol calculate the parity bit that PB can't do, you can calculate it (if you really wan't to try all possible commands but for a keyboard that doesn't really serve any purpose).

So test the following Device and Protocol upgrade Cable/1776. Be sure to delete all the learned commands first. If I'm right this will work as well as the learned commands.

Upgrade Code 0 = 6E F0 (Cable/1776) Nice Tracker Wireless keyboard (KM v8.22)
A1 00 80 00 3B 00 0A 29 00 00 08 08 04 04 0C 0C
09 09 06 25 0E 2D 01 23 02 21 06 FE 01 EF 02 ED
0A A5
End

Upgrade Protocol 0 = 01 A1 (S3C8+) Custom Protocol for Cable/1776 Nice Tracker Wireless keyboard (KM v8.22)
3D 92 12 8B 13 8D C4 10 01 08 00 EA 01 24 00 EA
01 24 92 7C 03 8E 01 24 8D 01 46
End
_________________
-Jon

johnsfine · Posted: Thu Jun 10, 2004 4:05 pm Post subject:

jon_armstrong · Posted: Thu Jun 10, 2004 5:44 pm Post subject:

The Robman · Posted: Thu Jun 10, 2004 6:51 pm Post subject:

I should also add that I haven't completely nailed down the forumula for the checksum yet. I've got it so that 95% of the bits calculate correctly but there's a couple of bits that are still wrong.

Jon, what did you make of the extra data stream in the middle of the ZERO and PAUSE signals?
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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!

jon_armstrong · Posted: Thu Jun 10, 2004 7:23 pm Post subject:

The Robman · Posted: Thu Jun 10, 2004 8:26 pm Post subject:

It was the same length as the other commands, with the same lead-in time and the same checksum.

Eric, could you re-learn the ZERO and PAUSE buttons, along with a sampling of some of the other buttons please?
_________________
Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help!

jon_armstrong · Posted: Thu Jun 10, 2004 8:32 pm Post subject:

Also, just learn with a sharp tap on the keyboard (don't hold the key down)
_________________
-Jon