Products > Test Equipment
EEVBlog 121GW Multimeter Firmware Details
tpw_rules:
I've set up a GitHub repository for future development and information, located here. The wiki on it is free to edit for anyone with a GitHub account. I plan to upload my IDA database tomorrow or so and work on documenting what I've found on the wiki. If you would like to help, please check out the Questions page. I haven't got my meter yet so I can't answer them.
I've got pretty much the entire thing documented in terms of variables and functions. Some algorithms I don't know yet and would like help with. But there's a hell of a lot of information we can use to start our own firmware, which I also hope to do on perhaps a bit of a longer timescale.
And as I mentioned previously, I have some firmwares edited with bugfixes, if anyone would like to test them out?
BU508A:
Is it possible to put this information into the very first posting of this thread?
Could be helpful finding it more easily imho.
Thanks.
Mr.B:
I don't have my meter yet.
I will be in wave 2 of the shipping (March?).
However, I am very interested in following the firmware thread - bookmarked, so to speak.
Iagash:
Dave, could you provide us with the pinout of the jtag connector, so I could try to read out the bootloader and the option byte values with my ST-Link dongle?
tpw_rules:
I've uploaded the database now. There's a lot more documentation to come too. I will really need y'all's help figuring out the reasoning behind the measurements. If we need to reimplement logging, whatever, but I'd really like to learn how and why the meter e.g. does frequency dependent offset for AC mode. Glance at the Questions page and see if you can figure something out.
By the way, thank you to GitHub users htro for determining the chip and c-MM for finding the clock crystals (though I have a hunch there's still an oscillator somewhere).
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