Hi, the original post says, This constant is calibrated at production time by Tuya, but sadly, when flashing new firmware we have no access to calibration data. But since then, LibreTiny has made a lot of progress in decrypting and interpreting the Tuya data partitions. Should we be able to...

>>21190524 For the Tongou DIN rail units I've found the original calibration data both in the reports from the Tuya firmware (DPS 22, 23, 24, 25) and also in the flash if we read it before overwriting it. More details at we ought to be able to give users a way of liberating these devices without having to recalibrate for themselves.If users do calibrate, we can calculate PREF based only on UREF and IREF too.

So you've got the calibration contants from Tuya API? Or would a 2MB flash dump be enough? Can you share the dumps? Maybe something is in Tuya JSON config partition?

>>21192909 > So you've got the calibration constants from Tuya API? Yes. > Or would a 2MB flash dump be enough? Also yes. > Can you share the dumps? Sure, a full dump is in the ltchiptool feature request linked from the above ESPHome issue. It's not in the JSON partition; it's in the key value store partition at 0x001d5000.

BK7231T or BK7231N? Here are N partitions: Code: C / C++Log in, to see the code Added after 50 :or you could mean Added after 1 [minutes]:btw Code: C / C++Log in, to see the code

>>21193062 BK7231N.For the partition information, I'm just repeating what I was told in

Extracting Tuya Calibration Data from Tongou DIN Rail Power Meter Flash Dumps

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#1 21190524 14 Aug 2024 09:42

dwmw2 dwmw2

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Post #1
21190524 14 Aug 2024 09:42

Hi, the original post says, "This constant is calibrated at production time by Tuya, but sadly, when flashing new firmware we have no access to calibration data."
https://www.elektroda.com/rtvforum/topic3887748.html

But since then, LibreTiny has made a lot of progress in decrypting and interpreting the Tuya data partitions. Should we be able to find the original calibration data somehow?
I have about 10 Tongou DIN Rail power meters to liberate, and can take copies of the full original flash from each and look for differences.
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#2 21191518 15 Aug 2024 06:59

dwmw2 dwmw2

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Post #2
21191518 15 Aug 2024 06:59

>>21190524
For the Tongou DIN rail units I've found the original calibration data both in the reports from the Tuya firmware (DPS 22, 23, 24, 25) and also in the flash if we read it before overwriting it. More details at https://github.com/esphome/issues/issues/6155

Ideally we ought to be able to give users a way of liberating these devices without having to recalibrate for themselves.

If users do calibrate, we can calculate PREF based only on UREF and IREF too.
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#3 21192909 16 Aug 2024 13:13

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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21192909 16 Aug 2024 13:13

So you've got the calibration contants from Tuya API? Or would a 2MB flash dump be enough? Can you share the dumps? Maybe something is in Tuya JSON config partition?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
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#4 21193054 16 Aug 2024 15:53

dwmw2 dwmw2

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Post #4
21193054 16 Aug 2024 15:53

>>21192909

> So you've got the calibration constants from Tuya API?

Yes.

> Or would a 2MB flash dump be enough?

Also yes.

> Can you share the dumps?

Sure, a full dump is in the ltchiptool feature request linked from the above ESPHome issue. It's not in the JSON partition; it's in the "key value store" partition at 0x001d5000.
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#5 21193062 16 Aug 2024 16:06

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #5
21193062 16 Aug 2024 16:06

BK7231T or BK7231N?

Here are N partitions:
Code: C / C++
Log in, to see the code

Added after 50 [seconds]:

or you could mean https://github.com/openshwprojects/OpenBK7231...71676018d23aa4777/sdk/include/kv_storge.h#L80

Added after 1 [minutes]:

btw
https://github.com/openshwprojects/OpenBK7231.../bk7231t_bl0937_1_plug_demo/src/bl0937.c#L883
Code: C / C++
Log in, to see the code

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#6 21193122 16 Aug 2024 16:36

dwmw2 dwmw2

Level 6

Topic author Helpful post? (0)

Post #6
21193122 16 Aug 2024 16:36

>>21193062
BK7231N.

For the partition information, I'm just repeating what I was told in https://github.com/libretiny-eu/ltchiptool/issues/38#issuecomment-2291726328
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