About the Mesh Config Entry occupies too much ram

RE: About the Mesh Config Entry occupies too much ram

AHaug — Wed, 19 Oct 2022 07:59:59 GMT

Hi,

The reason for why there are 16 entries the dmx scene is because SCENE_REGISTER_ARRAY_SIZE is set to 16, which is according to the mesh model specification, section 5.1.3.1. It should be fine to set it to 1 instead if this is what you need according to your requirements.

Kind regards,
Andreas

RE: About the Mesh Config Entry occupies too much ram

Mandeep — Tue, 18 Oct 2022 13:11:02 GMT

Hi Andreas

Thank for your answer.

Actually, my question is about the mesh config entry, my light data is 1024 byte, it mean 1024 byte for each config entry, When I use the mesh config entry, it must create a live value(dmx_scene) include 16 entry, the size is 16k, it occupies too much ram, my question is can I just create the value for one entry and can store or load the required entry into the value? I mean I don’t need all the scene data in RAM, I just want load the one I need.

RE: About the Mesh Config Entry occupies too much ram

AHaug — Mon, 17 Oct 2022 14:30:27 GMT

Hi,

The DMX is defined to have 512 channels of 8 byte in series corresponding to the light setting you want for your scene configuration. Each channel corresponds to 1 light and you will only transmit one channel per light you have in your network per frame, which means that you will only send information up to the amount of lights you have in your network. The DMX transmits synchronous with a long start bit, followed by the 1st to 512th bytes, and finished with a stop bit. Worst case this will be 512 bytes per channel.

If you control the entire process yourself, you're free to program it as you see fit, however if you want to have 2 universes/configuration of lights of 512 devices per DMX you will have 1024 bytes which will be around 16k of RAM if everything is being used in your controller. The same goes for a wireless connection - you will have to account for all of the channels resulting in the same memory requirements.

It is also worth mention that this is an open ticket so users with experience with DMX , feel free to chime in.

Kind regards,
Andreas