| Products > Test Equipment |
| Brymen IR connection protocol - Anyone sniffed it yet? |
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| jadew:
Awesome! Thanks a lot for the screenshots! Indeed, I think it represents which segments are ON or OFF and yeah, doesn't seem like UART because I can't spot any stop or start bits. Also, it's probably safe to assume that the spot where you wrote the values is actually the last digit, which is turned off, hence the HIGH value for all the segments. I think the bit meaning is this (MSB first): 4 5 0 1 6 2 3 7 So bit 7 is the dot, 4 - the top segment, 0 - top right, 1 - middle, etc. I think what we need to know now is what gets transmitted when you first plug the device in or when you start reading data, because there has to be a trigger string that starts all this up. So if you still have everything set up, it would be great to see what's going on at that time. I don't know why the TX diode reflects whatever is on RX, maybe it's just a way of saying we got the bit right, go on. I guess I can experiment with that once I get communication going. This would explain the weird baud rate as well, meaning that it's not given by any clock, but by how fast the devices respond to each other. Thanks again. PS: Love that scope of yours. |
| Simon Loell:
I just took the IR thing apart again. Maybe I have to measure some where else on the phototransistor. I will do the measurements tomorrow (it's 1a.m. local time). |
| jadew:
Cool, I'll set up a test environment by tomorrow. Cheers! |
| Simon Loell:
Happy news. I've got it hooked up right this time. After have tried to ohm the tracks on the PCB, it lead me into 3 pinheader holes marked with silkscreen "T", "R", "G"..... Guess what Einstein :-DD Anyway. It makes a bit more sense now. The PC transmits clock at a given frequency. Exactly 160 clock cycles. The multimeter sends data back in sync with the clock. Before the clock starts, a initialization pulse is given on 10ms. See if the data makes sense or if I have to make more measurements. |
| jadew:
Nice! I find it a bit weird tho that the clock signal is behind the data, in the close up you can tell that RX went high before TX went down. Kinda makes you wonder which edge is the setup edge and which one is the sampling edge, or... what's really the deal in there. I'll send that initial 10ms pulse first and see if I get anything in response. Edit: I'll get to it in about 20 minutes. I'm still working for my day job right now. |
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