Search found 20 matches

by izzy84075
Wed Oct 18, 2017 2:55 pm
Forum: Lazer Tag Modifications
Topic: LTAR TRRS Protocol
Replies: 75
Views: 46760

Re: LTAR TRRS Protocol

It can talk to the LTAR too. The current version has a text box at the bottom where you can type blocks in to send. It can also dump the RAM now in addition to all the variables. The firmware is in mask ROM so I don't think there's any way to permanently brick an LTAR through software. There are so...
by izzy84075
Thu Sep 28, 2017 6:12 pm
Forum: Lazer Tag Modifications
Topic: LTAR TRRS Protocol
Replies: 75
Views: 46760

Re: LTAR TRRS Protocol

Oh, duh. It would help to actually follow the schematic... All of the resistors I had grabbed were off by a power of 10(Brown black /yellow/, not brown black orange...). Now it takes a bit to stabilize(Mostly because of voltage spikes as things power up), but it does work. There's a new capture in t...
by izzy84075
Thu Sep 28, 2017 1:25 pm
Forum: Lazer Tag Modifications
Topic: LTAR TRRS Protocol
Replies: 75
Views: 46760

Re: LTAR TRRS Protocol

Yeah, it's similar to what's on the LTAR display. The circuit is something similar to this one, though I'm pretty sure this one is better than what I had figured out back then. https://i.imgur.com/zn6m854.png The input from the iPod/LTAR goes in where the 40Hz source is in that, and the output from...
by izzy84075
Thu Sep 28, 2017 2:19 am
Forum: Lazer Tag Modifications
Topic: LTAR TRRS Protocol
Replies: 75
Views: 46760

Re: LTAR TRRS Protocol

I've filled in a bit more information about the TAGGER-STATUS block on the wiki: https://wiki.lazerswarm.com/wiki/Tagger_Status_Block BData1 bit 5 is a bit more complicated than hunting/being hunted. Who's hunting who is a function of current game time and how many teams are in the game and which t...
by izzy84075
Wed Sep 27, 2017 4:00 pm
Forum: Lazer Tag Modifications
Topic: LTAR TRRS Protocol
Replies: 75
Views: 46760

Re: LTAR TRRS Protocol

I just pushed another update to my sigrok-decoders repo. There's now a ltar_smartdevice_decode PD, which decodes the "known" BTypes(Currently only 0x02 TAGGER-STATUS) and checks the checksums of blocks.

EDIT: Just pushed another that breaks down what's known of the TAGGER-STATUS block.
by izzy84075
Wed Sep 27, 2017 12:29 pm
Forum: Lazer Tag Modifications
Topic: LTAR TRRS Protocol
Replies: 75
Views: 46760

Re: LTAR TRRS Protocol

I'm thinking maybe that third data frame in the 0x20 block is a salt or a nonce for the DRM. No. 0x20 is unrelated to authentication. It looks like the 0x20 blocks are in response to 0xC0 and 0xA0. Since it happens every 10 seconds it might be the idevice polling to see if the LTAR is still connect...
by izzy84075
Tue Sep 26, 2017 2:57 pm
Forum: Lazer Tag Modifications
Topic: LTAR TRRS Protocol
Replies: 75
Views: 46760

Re: LTAR TRRS Protocol

I started looking at Izzy's capture. The first thing I notice is that all of the block types from the tagger are in the range 0x00-0x7F and all the block types from the device are in the range 0x80-0xFF. I'm pretty sure that block types 0x4F and 0xEF are related to the DRM. Correct! Block type 0x90...
by izzy84075
Thu Sep 21, 2017 8:15 pm
Forum: Lazer Tag Modifications
Topic: LTAR TRRS Protocol
Replies: 75
Views: 46760

Re: LTAR TRRS Protocol

Yeah, it's similar to what's on the LTAR display. The circuit is something similar to this one, though I'm pretty sure this one is better than what I had figured out back then. https://i.imgur.com/zn6m854.png The input from the iPod/LTAR goes in where the 40Hz source is in that, and the output from ...
by izzy84075
Thu Sep 21, 2017 6:47 pm
Forum: Lazer Tag Modifications
Topic: LTAR TRRS Protocol
Replies: 75
Views: 46760

Re: LTAR TRRS Protocol

Ah, okay, I see. Do your USB soundcard things have a stereo input? If so, try to get rid of the second splitter and rewire that handy-looking arrangement on the right-hand one to get the mic and left channels onto the left/right channels and record those with one soundcard. That should at least keep...
by izzy84075
Thu Sep 21, 2017 5:44 pm
Forum: Lazer Tag Modifications
Topic: LTAR TRRS Protocol
Replies: 75
Views: 46760

Re: LTAR TRRS Protocol

Ryan, I have a question about recording from the iDevice. The way I have been doing it is to disconnect the right channel from the input to the sound card so it's just floating. I think I've tried other ways too, i.e. disconnecting ground and right channel. It records ok, but is there a better way ...