Re: Issue of PS/2 IP core

Altera_Forum · ‎09-25-2009

I have implement a porgram which show the key from keyboard on VGA, but now i meet a trouble. it show twice character whenever i press the keyboard. I try to set a breakpoint at the condition if (decode_mode == KB_ASCII_MAKE_CODE );, then everything work properly. But when I remove the break point it show the character twice.

Can any one advice this? Thank you

#include "system.h"# include "stdio.h"# include "altera_up_avalon_character_buffer.h"# include "altera_up_avalon_pixel_buffer.h"# include "altera_up_avalon_ps2.h"# include "altera_up_ps2_keyboard.h"
 
/*Function that read keyboard input and show on monitor*/
void read_keyboard(alt_up_ps2_dev *ps2_kb, alt_up_char_buffer_dev  *vga)
{
    KB_CODE_TYPE decode_mode;
    alt_u8 buffer;
    int x = 0, y = 1;  //If y start from 0 character will hide on the top of monitor
    char ascii;
    char *inputStr;
    alt_up_char_buffer_init(vga);
    alt_up_char_buffer_clear(vga); //Clear previous character on the screen
 
    while(1) 
    { 
        if (decode_scancode(ps2_kb, &decode_mode, &buffer, &ascii)==0) //If get a make code from keyboard
        {
                if (decode_mode == KB_ASCII_MAKE_CODE );
                {
     translate_make_code(decode_mode, buffer, inputStr); //translate the code like "SPCAE", "BACKSPACE"
     alt_up_char_buffer_string(vga, inputStr, x,y);
     x++;
     if (x > 80)
     {
      y++;
      x = 0;
     }
     if (y > 60)
     {
      y = x = 0;
     }
    }
        }
    }
}
 
int main(void)
{    
 
    alt_up_ps2_dev *ps2 = alt_up_ps2_open_dev("/dev/up_avalon_ps2_0"); //open PS/2 device
    alt_up_ps2_init(ps2);
    alt_up_ps2_clear_fifo(ps2);
    alt_up_char_buffer_dev  *vga = alt_up_char_buffer_open_dev("/dev/up_avalon_character_buffer_0");//open vga device
 
 
   if (ps2->device_type == PS2_KEYBOARD) //Check if the device connected to PS/2 is keyboard
    {
 
        read_keyboard(ps2, vga);
    }
    else 
    {
        printf("Error...\n");
        return -1;
    }
 
 
 
}

Altera_Forum · ‎08-12-2010

have you solve the problem?

Altera_Forum · ‎12-09-2010

I am having this same problem. I'm also calling decode_scancode() in a while(1) loop, and it always gives me to make codes (press and release), never any break codes.

Anyone else have this issue? My code is essentially the same as ctkhai's

Regards,

Jonathon

Altera_Forum · ‎05-04-2011

Hi all, where did you get altera_up_avalon_character_buffer.h?

I am not finding this file in my PC at all.

Altera_Forum · ‎05-04-2011

@waiyung, Do you have the University Program IP packages installed? Anything with "_up" in it is referring to University Program.

Altera_Forum · ‎05-04-2011

By the way, all, this is definitely some sort of timing issue. I too got it to work while debugging and stepping through the program, but not running at full 16MHz. I wondering if its managing to pull the same code from the buffer twice before it is cleared or something. I know it's not elegant, but inserting some sleep (somewhere, I can't remember now) did the trick.

Altera_Forum · ‎05-04-2011

Yes, I have UP package installed. But it does not have the header file altera_up_avalon_character_buffer.h

I double checked it by searching through my PC. This file is not there. But I found altera_up_avalon_video_character_buffer_with_dma.h

Also, in the system file, I cannot find the character_buffer either. Any idea?