Read Playstation Controller Code

[ChemE]

I searched for the forums about this and saw that there has been a few topics discussing how to read a playstation controller but those threads did not have all the information I was looking for... so:

I am looking to be able to read a playstation controller using a PIC (an 877A to be exact).

Before I set forth to write code to emulate a playstation host on an 877A I thought I would ask if anyone has this code already written and would be kind enough to share?

I started looking into writing my own code but I am a little worried about timing issues... maybe someone can shed some light on this?
What I am wondering is if I use a 20mhz crystal on an 877A will it be too fast to use SPI to interface with PSX controller... what I mean is will the SPI clock speed be to fast for the controller to keep up? what do you all think?

Thank you for the help!

 

[blueroomelectronics]

Hard to say but this may help
http://www.gamesx.com/controldata/psxcont/psxcont.htm

 

[dknguyen]

You can run the SPI clock slower than the system clock- you know that right? You set the the SPI clock with registers in the IC.

And perhaps this will be of help:
**broken link removed**
**broken link removed**

And one of the links above leads to this code:
https://www.lynxmotion.com/images/files/ps2cmd01.txt

 

[ChemE]

Thank you for the replies. The psx document is very help I have been using it. I also looked more into the SPI clock speed and believe I should be alright.

I have another question now. I am trying to interface to different types of microcontrollers through SPI but one thing I have found is that they are at different voltages (3.3v compared to 5v).

If I am trying to receive or send information am i going to have problems since there high signal is not the same? What I am trying to ask is when the 3.3v chip is sending data to the SDI pin of the 5v chip will the 5v chip not register a 3.3v as a high signal?

If I have a problem how do I fix it?

Thank you.

 

[dknguyen]

Thank you for the replies. The psx document is very help I have been using it. I also looked more into the SPI clock speed and believe I should be alright.

I have another question now. I am trying to interface to different types of microcontrollers through SPI but one thing I have found is that they are at different voltages (3.3v compared to 5v).

If I am trying to receive or send information am i going to have problems since there high signal is not the same? What I am trying to ask is when the 3.3v chip is sending data to the SDI pin of the 5v chip will the 5v chip not register a 3.3v as a high signal?

If I have a problem how do I fix it?

Thank you.

More likely than not there will be reliability problems if not outright problems. Use level translator. If you need bidirectional communications over a single line, use a bidirectional one and it is highly preferably one that does automatic direction control rather than a separate direction control pin.