On 27/03/2011 20:55, threewheeler6 wrote:
>
>
> Oli Glaser wrote:
>> Could do with seeing info on how the switches are mapped to bits in the
>> bytes. From what I gather the console sends some request, then the
>> controller responds with 2 data bytes (after the initial sequence) Is
>> each switch just represented by a bit toggle?
>> Maybe your timing or alignment is out, or the data is getting corrupted,
>> but can't be sure of anything without some info on the console protocol
>> - a link to a relevant page or something.
>>
>>
> Sorry about that, http://www.gamesx.com/controldata/psxcont/psxcont.htm i=
s
> pretty complete.
>
> Thank You
>                       -Eric

Ah, that makes sense I think. The protocol for byte 4 of the digital=20
controller is :

Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7
SLCT           STRT UP   RGHT DOWN LEFT

The fact you are seeing up and right for up pressed, and down and left=20
for down pressed seems to suggest you may have the data line timing=20
wrong, and the up/down bit is "eating" into the next (down/left) bit=20
time. This could be due to a problem in your code, or capacitance on the=20
data line, so the voltage falls too slowly. Is the PIC pin directly=20
driving the data line? If you can't find the problem in your code, you=20
could try adding a buffer (or using a shorter cable, or just as a rough=20
test pull the line low a little earlier)
I would check the timing with a scope/logic analyser to see if this is=20
what is happening.

--=20
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