[W600 Chip] Configuring PWM for RGBCCT Lightbulb LED Channel Brightness Control

Question

Disassembled and successfully flashed an openbeken firmware for my lightbulb based on a W600 chip. By trial-and-error method, I managed to figure out five pins that are used for LED channels: red - pa5 green - pb13 blue - pb15 WW - pb8 CW - pb16 I can activate those via LED pin mode just fine,...

p.kaczmarek2 · Accepted Answer

That W600 build has finally succeeded, it seems. It should be ready for testing.

p.kaczmarek2 · Accepted Answer

Very well, it went easier than expected. Let me merge this branch and now let's look into the second issue.

Still, I am suprised that the code below does not work:

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Let's try to insert a conditional pwm_stop here (if value is 0):
https://github.com/openshwprojects/OpenBK7231T_App/pull/1016
Again, wait for the build to finish and check, also watch for flickering when adjusting PWM value (I am not sure if this platform likes repeated start calls)

p.kaczmarek2 · Answer

It seems that not yet all PWM pins are enabled in hal_pins_w800.c, which is also used for W600:

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I can try to enable remaining pins for you, would you be able to test new build once it's ready? I don't have W600 at hand, so it might take several attempts to get it right.

DanteBC · Answer

Sure. Let's try it. I prefer using OTA, so I don't have to desolder the chip again.

p.kaczmarek2 · Answer


red - pa5
green - pb13
blue - pb15
WW - pb8
CW - pb16

According to datasheet, PA5 is PWM_1, PB13 is PWM_2, PB15 is PWM_4, PCB8 is PWM_5 and PB16 is PWM_3 , so it should work.
Can you download build files from this pull request (find "download build artifacts, unpack zip"), do OTA, and recheck?
https://github.com/openshwprojects/OpenBK7231T_App/pull/1015

DanteBC · Answer

As far as I see all Wxxx images are failed to build, therefore there are no images of them inside the artifacts zip. Can you check please?

p.kaczmarek2 · Answer

Sorry, there must be some typo or something, I am helping now in about 4 threads and I am doing it in "round robin" manner, I haven't noticed it failing.
Oh yes, it's a typo:

I have put a dot instead of a comma. Let me fix this... and then try.

Added after 1 [minutes]:

When you test it, please test two things:
- are the PWMs that worked before STILL working?
- are new PWMs working?
Please REBOOT between every try, just to be sure... later check without reboots. Again, I don't have this device, so I need your help with testing.

Added after 9 [minutes]:

EDIT: One more fix added

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.

DanteBC · Answer

While it builds, I've noticed that PWM works a bit strangely. It never fully turns the channel off. Even on 0 or toggle off, it still glows slightly.

Gonna check the new build now. Thank you for your time. I appreciate your help so much.

p.kaczmarek2 · Answer

If you have time to test more, we can also fix this next issue as well. Maybe we need to turn off PWM entirely or smth.

DanteBC · Answer

Sure thing. As long as you have time.

Added after 13 [minutes]:

Tested all 5 PWM channels separately and they all work well. Except for the not turning off part.
One more question, how should I properly number the channels?

DanteBC · Answer

Tested all 5 PWM channels separately and they all work well.
Figured out the proper channel numbers too, so now I can set brightness, temperature, and color.
Everything works, except for the not turning off part.

DanteBC · Answer

Tested the new build and now everything works as it should! Channels work exactly as they should and 0 PWM actually turns off the channel. Color channels do not interfere with each other either. Thank you so much for your work!

p.kaczmarek2 · Answer

You're welcome, and now.. once you have this bulb fully working, can you tell me whether it's present on our list?
https://openbekeniot.github.io/webapp/devicesList.html
If not, consider posting a short teardown/guide (maybe some photos or marking from package, info where it was bought, etc...)

DanteBC · Answer

It's not present there. I'll make a few pictures of the insides, while it's in the disassembled state, and a few assembled too. I don't have the packaging as it was bought quite a while ago. But I'll provide as much info as I can.

[W600 Chip] Configuring PWM for RGBCCT Lightbulb LED Channel Brightness Control

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