Hi list.

I am currently designing a playstation controller interface using a 16F877 @
4MHz. (i want to control a couple of motors with the original PSX
controller)

I communicate with the controller using the SPI module @ 250 kHz SPI clk,
which works fine, however i am not getting a response from the
PSX-controller.

When measuring on the PSX-controllers SDO all i can see is approx. 100 mV
cross talk from the SDI. I have tried to connect pull-ups/downs with no
luck.

Here's the sequence i am using :

Lower ATT pin (get controllers attention)
Transmit 0x80,0x42 and 7 times 0x00
Rise ATT.

(normally 0x80 should be 0x01, but PSX uses LSB first - F877 uses MSB first-
and i have tried both)
Anyway, after i have transmitted 0x80, the controller should respond with a
controller ID during the transmission of 0x42, but i get nothing.

I can measure the CLK and 0x80 and 0x42 perfectly with my scope.

Does anybody have an idea ?
(At one point i thought i'd fried the controller, but then i connected it to
a playstation and it still works fine)

Best regards

Jan


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