Re: Nios II PS2 Keyboard

Altera_Forum · ‎01-28-2014

In QSYS I added a PS/2 Controller IP Core and wired it in Verilog.

My code:

#include <stdio.h># include <stdlib.h># include "system.h"
# include <altera_up_avalon_ps2.h># include <altera_up_ps2_keyboard.h>
alt_up_ps2_dev *ps2;
KB_CODE_TYPE *decode_mode;
alt_u8 buf;
char ascii;
int main()
{
    ps2 = alt_up_ps2_open_dev("/dev/ps2");
    alt_up_ps2_init(ps2);
    printf("Detected device: %d\n",ps2->device_type);
    while (1)
    {
        decode_scancode(ps2,decode_mode,&buf,&ascii);
        if (*decode_mode != 6)
            printf("Decode mode: %d Buffer: 0x%X ASCII: %c\n",*decode_mode,buf,ascii);
    }
    return 0;
}

Decode mode is always 1 or 2, and the buffer is always one byte even if it should be longer. (for example Right Alt key)

Altera_Forum · ‎01-28-2014

Problem solved. Can not execute decode_scan without any delay.

Altera_Forum · ‎07-21-2014

Can you help me?

I have a problem with ps2 keyboard interface.

I used a ps2 controller and used code C in Nios ii for connect to PS2 keyboard

But when I try to connected and detected device by instruction " printf("Detected device: %d\n", ps2->device_type);" then result is:

"Detected device: -1".

what wrong with my project? Please help me.