linux and the 944

scheistermeiste · 02-08-2004, 09:02 PM

being the linux/computer dork that i am, and having seen linux put on everything from a watch to a x-box ect. has anyone made their 944 run linux???

bryanthompson · bryanthompson's Garage

I wanna know too. yaay for linux

Sabyre · Sabyre's Garage

Open Based ... Nice!!!

kraft · 10:09 AM

.

plandy · 02-09-2004, 09:05 AM

I am all for the idea too!

scheistermeiste · 02-09-2004, 09:07 AM

thats cool as hell but i was actually talking about it being like the DME. would you be able to hook it up to where it actually controls air/fuel maps and other stuff?

Zero10 · 02-09-2004, 09:46 AM

Umm... well yes and no.
You would need some kind of external controller, like an OOPIC or something, because there is data coming in on too many pins, the controller could convert all the incoming data (with the help of an analog-digital converter), and turn it into a serial stream, which could enter on a serial port of any computer. Then you could write a program to interpret this data, and send signals back out, through the oopic and back to the engine. However I fear that the lag time of all these processes will be too much, and you will have to allow for some guestimating, which will lead to decreased performance.
Plus, if you computer ever slows down just a little, it could stall your car.
that is, don't use it to control your sound system too, lol.

However, the idea itself is pretty cool, but I would feel better programming an OOPIC to run the engine, than trying to interface to a PC.

I suppose you could skip using an external controller, but you would have to use multiple ports, and use an analog-digital converter. Along with many transistors to turn your +5V into a +12V, or a switched ground for the coil, etc...
But, that would allow for some pretty cool anti-theft systems.

scheistermeiste · 02-09-2004, 09:57 AM

would it be possible to burn linux directly to a chip so it runs your DME?

kraft · 10:10 AM

.

kraft · 02-09-2004, 10:14 AM

Quote:

Originally posted by scheistermeiste
would it be possible to burn linux directly to a chip so it runs your DME?

in my opinion everything is possible the question then is to know how many time/people/money it would consume for a year to develop something like that.
It would certainely be more accurate and fast in data treatment than a simple 80C51 or Z80 when i see some pocket pc but playing in this game it's only for big boys with big money more than i will ever have.

bryanthompson · bryanthompson's Garage

I'm writing a program right now that takes a stream of data from the Weather Service's satellites, down to our dish, to the demodulator, to the serial port. Serial IO isn't that hard in Java... the hardest part for this project was finding the beginning/end of each packet. If the DME sends a pulsed signal, i can't imagine it being very hard. The hardest part would be making sure you have the exact right formulas or interpration logic. The smallest error in there could potentially cause a ton of damage.

I'd be willing to expirament if anyone has info on pinouts.

Zero10 · 02-09-2004, 07:53 PM

I was trying to make a data logger for the 944 DME, the problem I ran into, is you have to solder a wire into the DME to send it data, and it has a bitrate of 93750, which is very difficult to translate into something usable.