And, any idea how to use them? 3 pins is perplexing.
Wrong stuff removed
Nope.
UPDI used on Atmel micros on Anduril capable flashlights uses a single line for debug and flashing. Much earlier than that, Motorola/Freescale/NXP Coldfire, S12, and some other MCUs used BDM which was also a single wire protocol.
If you want to flash a newer Anduril to this light, look here for hardware and procedures to use those pads.
The programming hardware won’t help because the firmware is closed source.
You don’t need the original source to program a flashlight. If it’s ATTiny based then Anduril has your back.
Aren’t most microcontrollers programmed over UART? AVR has their own one wire programming interface, but neither use clock signals.
One wire is more for just a few sensors. I think the STmicro stuff has a 1 wire option. At least one of my programmers has a label for it, but with all my hobby stuff, I’ve never used 1 wire for programming. I have only used it for a temperature sensor as far as I can recall. Everything is either JTAG or UART in my limited experience.
So there’s the OneWire protocol that’s for sensors, different microcontrollers will implement a programming protocol using a single wire, which is what I meant.
Jtag has a clock signal, but is generally 5 lines.
My point being that looking for similar trace lengths because one is a clock signal isn’t sound advice. All the common protocols either don’t use a clock signal, or are more than two lines.
That photo doesn’t look like a Sofirn LT1S at all.
Oops you are right, I got the model designations mixed up. It is the one with 1x 21700. LT1 mini? It’s not on their site right now, I guess OOS. But I took the pic myself. I hope it comes back since it’s a nice light.
Added: I’ve edited the title, thanks for the catch!
Certainly looks like UPDI pads. I have update the firmware on other kinds of flashlights with similar pads. You can try to connect with a test command without trying to reflash. Here is a lot of information on the topic: https://budgetlightforum.com/t/anduril-flashlight-reflash-reference/216942
they might be.
