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Forum Index : Microcontroller and PC projects : Creating my own ps2 keyboard with MMBasic
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Plasmamac Guru  Joined: 31/01/2019 Location: GermanyPosts: 554 |
Hi , id like to build my own Ps2 keyboard with MMBasic and the pico. So i need to create the PS2 protocol within MMBasic. What di you think? Plasma |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
It depends on how far you want to go. The simplest PS/2 keyboard (just the basic keys) might be ok, but some keys send several characters. You might find that scanning the keyboard in software isn't very fast, especially if you want rollover detection. Probably fine for ordinary typing but not for gaming. Lots of info Here The transmission protocol might be difficult to get the timing right in MMBasic. You may need to use BITSTREAM or even a PIO. I suggest you try a little ASCII keyboard routine first and see how you get on. Edited 2023-10-08 19:45 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
Holtek used to sell a PS/2 keyboard chip in 40-pin DIL, but I don't know if you can get them anymore. HT82K628A_Holtek.pdf It would probably be easier to go this route, then to try to have MMBASIC generate the PS/2 codes, as I understand the PS/2 protocol is pretty fast. Smoke makes things work. When the smoke gets out, it stops! |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 830 |
Maybe this will help you? Arduino ps2dev library https://github.com/Harvie/ps2dev/tree/15cb56c78ddccfeeeccf4e26e04d2385c380a1f4 Frank |
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