raspberry pi pico - interfacing with ps2 keyboard with pio

[@ErTnEc]

Nice example, although not sure if I'm missing something? I've connected a Model F AT keyboard to my RP2040, I can read the scancodes just fine, but when trying to send 0xED to set the LED, the keyboards response is 0xFE (Resend).

[@brendenadamczak9283]

Interesting? Do you have a logic analyzer to grab whats happening?

[@ErTnEc]

@@brendenadamczak9283 thanks, I actually figured it out not long after my comment.. Whenever you call atk_send_command, you are only ever adding the parity bit when you send the LED state itself, but when you send initial commands (such as PS2_COMMAND_SET_LED), you're not adding the parity bit to the command, so the keyboard fails to acknowledge it.

[@fredrikbergquist5734]

Looking at Gist I can’t find the code for the PIO

[@brendenadamczak9283]

so the pio code is here github.com/brendena/atkPico/releases/tag/v0.1

[@salmantechnologies282]

Here You are Using Pi_pico as a Device right and our pc will be the host or both host or device kindly tell me about i am learning USB protocol

[@brendenadamczak9283]

Yep i'm using the pico as a device in this video. In USB there can be lots of usb device but only one host. So if you plugging a usb device into you pc then it's going to be a device.

[@fredrikbergquist5734]

Really nice! Is the timing dependent on clock speed? I am overclocking the Pico, will that be a problem?

[@brendenadamczak9283]

Should work at different speeds. The code has a clock to calc the proper divide.

[@syrus3k]

Lol, I've been bashing my head against a wall and it's very obvious now from your video that I'm putting 5v into the PICO's GPIO with clock and data pins hence it's not working.. whoops.

[@csbluechip]

Another awesome video ...sadly I want to pretend to be a PS/2 mouse/keyboard ...but much was learned :)

[@brendenadamczak9283]

Got you covered here too! kzbin.info/www/bejne/d4Wqi3dodt55ocU

[@csbluechip]

@@brendenadamczak9283 You Star! :)