Latest revision as of 20:33, 1 August 2010

Instructions to connect a PS/2 keyboard to your Armadeus board

Your Armadeus board allows you to connect it a PC keyboard, by using the power of the Spartan3 FPGA (if present on your board).

Connect the PS/2 DATA line to the FPGA pin P137 (IO_L27N_0) and the CLOCK one to the FPGA pin P140 (IO_L01P_0).
If your keyboard supports 3,3v power supply you don't need to use the resistor divider brige ! Just use 3,3v from your development board and connect the PS/2 connector pins directly to the FPGA.

Firmware for PS/2 is avaiblable in your SVN repository: firmware/PS2/ps2_top.bit
Copy it to your TFTP directory and follow the procedure here.

The core uses the following register map:

Address	Name	Description
0x12000000	Status register	The following bits are used: 0x2 => empty, 0x8=>full, the other bits can be ignored (not used or for debug purposes)
0x12000002	Data read register	The keyboard scancodes can be read from this register. After each access, the next byte from the fifo appears here
0x12000004	Test register	(has nothing to do with the PS2 interface, just for fun) The lower 8 bit behave like a normal RAM
0x12000006	Test register	(has nothing to do with the PS2 interface, just for fun) The lower 8 bit behave like a normal RAM
0x12000008	Test register	(has nothing to do with the PS2 interface, just for fun) The value is always 0x1234, write is ignored

Use this Linux driver to control this IP.

Status register starts with value 0x000A -> Fifo Full + Fifo Empty normal ??

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 * http://www.rennes.supelec.fr/ren/fi/elec/docs/mouse_ps2/souris_ps2.htm
 * http://www.computer-engineering.org/ps2protocol/
-{{LanguageBar|PS/2|PS/2|PS/2}}
 [[Category:UserInput]]