Epicenter
Well-Known Member
I am currently in the process of adding a D-Pad to my GP2X (MK1, Non-First Edition unit). I'm using equipment generously provided to me by Radek with some modifications-- I'll be providing photos upon completion along with information on what exactly I did. Once I have the relevant info which is why I'm posting this thread, it should not take long at all, assuming my GP2X does not explode in a maelstrom of fire, sparks and fury.
Anyway! I'm to the point where I must know which pins on the GP2X stick connect to each other when the 4 ordinal directions on the default stick are pressed; UP, DOWN, LEFT, and RIGHT. I will quote Bacteria's thread (http://www.gp32x.de/board/index.php?showtopic=27227&hl=) with this bit:
However, there was a picture once showing where A, D,G, J, F and I *were* on the board. As it stands, none are labelled and the names seem to be mostly arbitrarily assigned, so this diagram was really all I had to go on-- however, it seems to have fallen off the face of the internet.
So I did a little more detective work. Grahf went ahead and stuck an NGC d-pad on his '2x and posted a few images. The most useful were these two:
Inverting the image of the NGC pad's contact board, I could faintly make out traces, so I drew over them as below and labelled them as I Believe they are wired to the GP2X board. Note how the one I marked as going to pin I or C (in all probability) does not terminate at a switch but forms the common trace that touches one side of EVERY direction's switch. This leads me to believe it is a HI (3.3v?) or GND trace hooking to I/C that is coupled with the appropriate direction line when a switch is closed.
.. here is another image from Grahf I inverted which shows the same trace structure.
The other 4 lines appear to lead to the pins I labelled above. Look legit? What I've made are of course just educated guesses; very educated but still just guesses. Since the stick is dismantled already I'm unable to do continuity checks to confirm anything, so any useful information before I go experimenting some more and wasting a lot of time would be extremely helpful. Thanks a ton to anyone who can offer a tidbit of advice here or there! (oh yes, and of course; I've PM'ed Radek, Grahf and Reesy about this one..)
Anyway! I'm to the point where I must know which pins on the GP2X stick connect to each other when the 4 ordinal directions on the default stick are pressed; UP, DOWN, LEFT, and RIGHT. I will quote Bacteria's thread (http://www.gp32x.de/board/index.php?showtopic=27227&hl=) with this bit:
Bacteria said:
However, there was a picture once showing where A, D,G, J, F and I *were* on the board. As it stands, none are labelled and the names seem to be mostly arbitrarily assigned, so this diagram was really all I had to go on-- however, it seems to have fallen off the face of the internet.
So I did a little more detective work. Grahf went ahead and stuck an NGC d-pad on his '2x and posted a few images. The most useful were these two:
Inverting the image of the NGC pad's contact board, I could faintly make out traces, so I drew over them as below and labelled them as I Believe they are wired to the GP2X board. Note how the one I marked as going to pin I or C (in all probability) does not terminate at a switch but forms the common trace that touches one side of EVERY direction's switch. This leads me to believe it is a HI (3.3v?) or GND trace hooking to I/C that is coupled with the appropriate direction line when a switch is closed.
.. here is another image from Grahf I inverted which shows the same trace structure.
The other 4 lines appear to lead to the pins I labelled above. Look legit? What I've made are of course just educated guesses; very educated but still just guesses. Since the stick is dismantled already I'm unable to do continuity checks to confirm anything, so any useful information before I go experimenting some more and wasting a lot of time would be extremely helpful. Thanks a ton to anyone who can offer a tidbit of advice here or there! (oh yes, and of course; I've PM'ed Radek, Grahf and Reesy about this one..)
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