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PS/2 Keyboard: Difference between revisions
The keyboard reset transaction was not clear, the reset function does return ACK before the test result
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(Scan code set 3) |
(The keyboard reset transaction was not clear, the reset function does return ACK before the test result) |
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| Get/set current scan code set
| 0xFA (ACK) or 0xFE (Resend) if scan code is being set; 0xFA (ACK) then the scan code set number, or 0xFE (Resend) if you're getting the scancode. If getting the scancode the table indicates the value that identify each set:
{| {{wikitable}}
|-
! Value
! Use
|-
| 43
| Scan code set 1
|-
| 41
| Scan code set 2
|-
| 3f
| Scan code set 3
|}
|-
| 0xF2
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| None
| Reset and start self-test
| 0xFA (ACK) or 0xFE (Resend) followed by 0xAA (self-test passed), 0xFC or 0xFD (self test failed
|}
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The following table shows which scan codes correspond to which keys when using scan code set 1 (for a "US QWERTY" keyboard only):
Note that scancodes with extended byte (E0) generates two different interrupts: the first containing the E0 byte, the second containing the scancode
{| {{wikitable}}
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The following table shows which scan codes correspond to which keys when using scan code set 3 (for a "US QWERTY" keyboard only):
[https://web.archive.org/web/20170108131104/http://www.computer-engineering.org/ps2keyboard/scancodes3.html Scan Codes]▼
{| {{wikitable}}
|-
!Key
!Code for Scan code set 3
|-
|A || 1C
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|-
|Z || 1A
|
▲[https://web.archive.org/web/20170108131104/http://www.computer-engineering.org/ps2keyboard/scancodes3.html Scan
==See Also==
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===External Links===
*[http://www.win.tue.nl/~aeb/linux/kbd/scancodes.html Keyboard scancodes] - A complete reference on all scancodes you might encounter.
*[https://web.archive.org/web/20030621203107/http://www.microsoft.com/whdc/hwdev/tech/input/Scancode.mspx USB HID to PS/2 Translation Table] - Microsoft's table of scancodes and USB equivalents
*[https://web.archive.org/web/20190301075756/http://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/scancode.doc Keyboard Scan Code Specification] - Microsoft's specification for scancodes
*[https://www.youtube.com/playlist?list=PLUZozxlhse-NUto5JeJ0EDXEUFloWBdAj PS/2 keyboard interface playlist] - A video playlist of building a PS/2 keyboard interface on bread boards, by Ben Eater.
==== Implementations ====
* [http://lxr.linux.no/#linux+v3.5.4/drivers/input/keyboard/atkbd.c Linux] (C,GPL)
* [https://github.com/
[[Category:Human Interface Device]]
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