Unoffical empeg BBS

Quick Links: Empeg FAQ | RioCar.Org | Hijack | BigDisk Builder | jEmplode | emphatic
Repairs: Repairs

Topic Options
#275385 - 01/02/2006 14:14 digital inputs
natewhip
Quiet One

Registered: 03/11/2003
Posts: 0
Loc: Idaho
if it is possible to add digital output could it be possible to add a digital input?

Top
#275386 - 01/02/2006 14:18 Re: digital inputs [Re: natewhip]
tman
carpal tunnel

Registered: 24/12/2001
Posts: 5528
In theory yes. But in practise, no. The lines that go to the tuner can be reconfigured to operate as a digital input but even the designers of the empeg never actually tried it.

Top
#275387 - 01/02/2006 17:33 Re: digital inputs [Re: tman]
schofiel
carpal tunnel

Registered: 25/06/1999
Posts: 2993
Loc: Wareham, Dorset, UK
Well, the sound o/p to the digital board is I2S, so the same bus could be used to transfer sound data. Problem is, there's no receiving device on the bus that could do something with it, so even if you made an electrical connection that was I2S compliant, it would not be useful.

There is also an I2C bus, as has been demonstrated by Benjamin's fan controller. This requires a device driver in the kernel if you want to use it from application userland: however, you'd have to write the driver and build the kernel before even starting on the application to use it. The player app would do nothing with it - only (potentially) the HiJack kernel, if you talked Mark into adding support for something.
_________________________
One of the few remaining Mk1 owners... #00015

Top
#275388 - 01/02/2006 18:12 Re: digital inputs [Re: schofiel]
tman
carpal tunnel

Registered: 24/12/2001
Posts: 5528
There already is a possible method for getting the sound data in and it is connected to the correct DSP input as well.

Top
#275389 - 02/02/2006 08:26 Re: digital inputs [Re: tman]
schofiel
carpal tunnel

Registered: 25/06/1999
Posts: 2993
Loc: Wareham, Dorset, UK
Not according to what I can see on the circuit diagrams, there isn't.
_________________________
One of the few remaining Mk1 owners... #00015

Top
#275390 - 02/02/2006 11:06 Re: digital inputs [Re: schofiel]
tman
carpal tunnel

Registered: 24/12/2001
Posts: 5528
That is what Hugo said.

Top
#275391 - 02/02/2006 11:08 Re: digital inputs [Re: schofiel]
tman
carpal tunnel

Registered: 24/12/2001
Posts: 5528
Quote:
There is also an I2C bus, as has been demonstrated by Benjamin's fan controller. This requires a device driver in the kernel if you want to use it from application userland: however, you'd have to write the driver and build the kernel before even starting on the application to use it. The player app would do nothing with it - only (potentially) the HiJack kernel, if you talked Mark into adding support for something.

I2C isn't designed for audio which is why they made I2S.

Top
#275392 - 02/02/2006 11:58 Re: digital inputs [Re: tman]
schofiel
carpal tunnel

Registered: 25/06/1999
Posts: 2993
Loc: Wareham, Dorset, UK
Didn't say it's for audio - just pointing that it's there: there's also three I/O lines on the ethernet, plus a few other unused bits.
_________________________
One of the few remaining Mk1 owners... #00015

Top
#275393 - 02/02/2006 13:03 Re: digital inputs [Re: schofiel]
mlord
carpal tunnel

Registered: 29/08/2000
Posts: 14491
Loc: Canada
Quote:
there's also three I/O lines on the ethernet


Really? Do you mean, on the RJ-45 jack conductors?

That could explain why the empeg is flakey/fussy about ethernet switches..

Top
#275394 - 02/02/2006 13:16 Re: digital inputs [Re: mlord]
schofiel
carpal tunnel

Registered: 25/06/1999
Posts: 2993
Loc: Wareham, Dorset, UK
No, there are three I/O lines on the chip brought out to pads on the PCB. I am not sure if the driver supports the use of the lines though (ioctrl?).
_________________________
One of the few remaining Mk1 owners... #00015

Top
#275395 - 02/02/2006 14:23 Re: digital inputs [Re: schofiel]
mlord
carpal tunnel

Registered: 29/08/2000
Posts: 14491
Loc: Canada
Quote:
there are three I/O lines on the chip brought out to pads on the PCB.


We should use them to wire up some extra tri-colour LEDs or something!

Top
#275396 - 02/02/2006 17:13 Re: digital inputs [Re: mlord]
schofiel
carpal tunnel

Registered: 25/06/1999
Posts: 2993
Loc: Wareham, Dorset, UK
Funny you should mention that.....
_________________________
One of the few remaining Mk1 owners... #00015

Top