Baud rate setting option.

[s4CD]

I know. DMX is a standard and has a standard baud rate and that standard is 250000. But hear me out.. are you familiar with DMX512PF IC? It is a pixel protocol that is structured essentially the same as DMX512 except at a baud rate of 650000, allowing for more channels per universe. It also accepts standard DMX512, but that limits you to 170 pixels (510 channels) per run.

I have tested that your library works perfectly with it after changing the declared baud rate in TeensyDMX.cpp line 12 to be 650000.

For testing I added a function (setSpeed) to the Receiver class and the Sender class that allowed switching between the speeds by calling dmxRx.end(), then dmxRx.setSpeed() (feeding a 0 or 1 depending what is desired) and then dmxRx.begin() (or dmxTx if sending) and it works fine to switch on the fly. To do this I had to make kSlotsBaud, kBitTime, and kCharTime NOT declared as constants and then in Receiver/Sender the function sets kSlotsBaud and recalculated the other two. This seems pretty janky but it does seem to work.

I have done pretty extensive tests sending data to a light string by hardcoding the declared baud rate to 650000. I have NOT done a ton of testing changing the speed on the fly, and I'm sure that how I did it is not the proper way to handle it.

I would love to hear what you think and see if you have any interest in adding this as a feature. I'm not sure where in the world you are, but a I could test as needed or potentially send a string or two of the 512pf lights.

[ssilverman]

As you pointed out, it would no longer be DMX. Do you have a link to a protocol specification document? I don't mind taking a look at a specification.

[ssilverman]

@s4CD Do you have a link to a DMX512PF IC datasheet?

[s4CD]

I am sorry for the delay... (Even though it is a little bit your fault as I have been playing with QNEthernet.. lol)
All I have is one in Chinese, but the breakdown for the data structure is in English. I have uploaded it here:
http://mys4i.com/chris_docs/DMX512P_SpecSheet.pdf