Hello, can someone please help me with DMX

MiB1986 · Joined: 05 Jun 2007 Posts: 3 Location: UK

Hiya,

I am looking to see if you can help, for several years now ive used picaxe, from www.picaxe.co.uk, and this is unfortunately too slow for DMX... as it works on token, but is great for things which do not require fast programs.

I would like to move onto DMX and this means upgrading into an intrupiter, i managed to make a DMX transmitter using one of there processors based upon a pic16f88 and it worked fine, i did this by slowing down for the break and then speeding up for the transmit. etc anywayz

I am completely new to this side of programming in extreme, ie i only know how to turn on and off a few LED using CCS complier and native pic micro,

but what i am after if possible is an example of a DMX reciever which is able to recieve 1 channel of DMX, obviously this channel id choose within the universe.

I intended to do this using a DIP switch, 8 way, and then simply reading portb say to a variable and then using that variable value as the DMX addres, would it work in your opinion?

Basically for now, is it possible to provide me with a DMX reciever code, and a DMX Transmitter code please.... as well as the processor information it will work on.

This code only has to work, and perhaps just store the DMX value recieved in a variable so later i can just use a compare statment and say if value is in the range of... do this etc...

I would perferbily like the resonator to be inside the processor for ease of use, although i do know they are not as acturate so an external is easily considered,

Please can you help, i understand and appreciate this is maybe a tall order.

If you are not able to provide full code, can you please tell me what devices would work with the code posted on the forum previously

I understand about the break, the header etc... i just cant get what i am used to using recieving and storing the data that fast.

Kind Regards....

Martyn

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Microchip has an appnote (AN1076) for DMX512 protocol.
They have source code in ASM. Convert it to CCS.
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en527825

MiB1986 · Joined: 05 Jun 2007 Posts: 3 Location: UK

I have read it,

But how do i convert it?

Is there a way to convert it?

Thanks

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

If you know both CCS and ASM (even a little bit of ASM), then you
can convert it. For example, look at this file:
DMX512TrmtDemo.asm

The first part of it consists of CONFIG statements. In CCS, those
are settings are done with a #fuses statement.

Next come two #define statements:

MiB1986 · Joined: 05 Jun 2007 Posts: 3 Location: UK

unfortunately, i dont have these skills yet,

if i knew how to write in ASM i woud not bother with C, therefore am unable to covert it to C

Thanks for your help though and your time to reply...

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

You don't have to be able to write ASM. You just have to be able to
understand it enough (along with reading the comments) to get a good
idea of what's it's doing, and then write that same concept in CCS.
It doesn't require full ASM programmer skills to do the conversion.

But there's other code out there. This is found with Google.
http://ander.jp/blogarchives/dmxtoled.c

Here's code found with the CCS forum's search page. There may be more.
https://www.ccsinfo.com/forum/viewtopic.php?t=21092&postdays=0&postorder=asc&start=15

Forum search page:
http://www.ccsinfo.com/forum/search.php