DALI 2 DT8 Tuneable White software stack

Bill2 · ‎2025-04-16

Does anyone know if there are any software stacks available through ST that support DALI 2 colour tuneable (DT8) control gear devices (LED drivers). I can see that ST have a third party offering from MBS Solutions that claims to offer full DALI2 support but after contacting them they say that it doesn't support any DT8 control gear commands except RGBWAF - which none of my clients are asking for ...

MOBEJ · ‎2025-05-12

Hello @Bill2 ,

I recommend checking the user manual UM1728.This document provides detailed information on the implementation of the Digital Addressable Lighting Interface (DALI) within the STM32F1xx 32-bit microcontroller family. It should offer valuable insights and guidance for your project.
BR

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Ozone · ‎2025-05-12

I had been dealing with DALI and DT8 quite some while ago, but it seems things haven't changed too much.
Although standardized, it seems mostly larger vendors promote and use this protocol.

I would drop the "ST" (or "ARM Cortex") constraint, and check out other implementations as well.
If it's reasonably well implemented, a port of the device type specific logic shouldn't be too difficult.

sven2399 · ‎2025-10-27

You can contact me here: sevenlab.de - if this is still an issue for you. Though, I am puzzled why an RGBWAF model doesn't fit your requirement. Obvously, you do not need to support all color channels. Most drivers implement RGBW.

Bill2 · ‎2025-10-28

@sven2399 wrote:
You can contact me here: sevenlab.de - if this is still an issue for you. Though, I am puzzled why an RGBWAF model doesn't fit your requirement. Obvously, you do not need to support all color channels. Most drivers implement RGBW.

RGBWAF doesn't fit my requirement because my requirement is for tuneable white.

sven2399 · ‎2025-10-28

The device type 8 standard covers all kind of multi-colour gears. As I wrote, you do not have to support all the six channels in RGBWAF. The minimum is two channels, like for tunable white drivers. All the commands and behaviour for tunable white drivers are described in the IEC 62386-209 standard.
What got you confused is that the device needs to support calculations, e.g. from a colour temperature to intensity of the different colour-channels. For RGB(W) that is rather trivial, and that is just what MBS supports.

Bill2 · ‎2025-10-28

I think you are getting confused. I contacted MBS and they said that they currently only support RGBWAF mode, not tuneable white or XY but that they are adding those modes soon (probably they have already done that by now).

sven2399 · ‎2025-10-28

I apologize for my mistakable reply (and it I didn´t wanted to imply you are confused). I meant that the MBS stack only supports RGBWAF commands because there is only a simple calculation to set the colour for the different LED channels accordingly. Tc and XY commands require calculations in the colour space that are currently not implemented in the MBS stack.