Data and clock pins reversed according to oscilloscope measurement?

[nanoant]

First of all I want to share news that I managed to build working unit with HW-221 TXS0108E level converter that I had lying around:


Notable differences:

1. GPIO13 is connected to OE of TXS0108E, instead of powering the unit. TXS0108E is powered from 3.3V and 5V pins.
2. Only 4 of 8 are used and shifter is on the back of Rpi Pico, but HW-221 board is extremely cheap so IMHO can be better bang for buck for this project. And I have quite a stock of these boards.
3. Looks there's a short between GND and A3, but actually they don't touch, and there's additional transparent isolation.
4. I did not solder PS/2 plugs, instead use Dupont, since I want also to talk with boards/FPGA that have PS/2 pins but no proper sockets.

Now the problem. According to my oscilloscope I see keyboard clock on GPIO11 and data on GPIO12, which is opposite from what is written in the documentation. I checked both level shifter and Pi pins. This looks like some trivial problem but I have honestly no clue why this is happening. Any thoughts?

[No0ne]

Hi, nice work/photos!
I'm currently in the process of swapping pins, see https://github.com/No0ne/ps2x2pico/releases/tag/beta-0.6
The PIO code which uses data before clock isn't finished yet.
The old CPU bitbang code did use clock before data on the GPIOs.
Hope this clarifies your issue!

[nanoant]

All clear! Many thanks @No0ne for your great contribution to retro-noobs community ;)