[RESOLVED] ps/2 mouse initalization / keyboard interrupt

megatron23 · **Joined:** Sat Oct 22, 2011 3:03 pm **Posts:** 19

If I initialize the mouse with SANiK's code and enable IRQ12 IRQ1 for keyboard input won't fire anymore. What could I have done wrong?

egos · **Joined:** Fri Nov 16, 2007 1:59 pm **Posts:** 612

Show your ISR code for IRQ12.

megatron23 · **Joined:** Sat Oct 22, 2011 3:03 pm **Posts:** 19

Code:

void mouse_handler() {
  uint8 mouse_stat = inportb(0x64);

  if ( !(mouse_stat & 0x01) || !(mouse_stat & 0x20) ) {
     return;
  }

  switch(mouse_cycle) {
    case 0:
      mouse_byte[0]=inportb(0x60);
      mouse_cycle++;
      break;
    case 1:
      mouse_byte[1]=inportb(0x60);
      mouse_cycle++;
      break;
    case 2:
      mouse_byte[2]=inportb(0x60);
      mouse_x=mouse_byte[1];
      mouse_y=mouse_byte[2];
      mouse_cycle=0;
      break;
  }
}

egos · **Joined:** Fri Nov 16, 2007 1:59 pm **Posts:** 612

Well

But where's EOI command?

megatron23 · **Joined:** Sat Oct 22, 2011 3:03 pm **Posts:** 19

egos wrote:

Well

But where's EOI command?

That is in my ISR. I replied before you edited your reply from "Post your mouse handler".

The ISR calls the mouse_handler and EOI afterwards.
Other IRQs like 0 or 8 do fire, exept IRQ 1.

Bietje · **Joined:** Wed Apr 20, 2011 6:57 am **Posts:** 100

What PIC mask did you set?

megatron23 · **Joined:** Sat Oct 22, 2011 3:03 pm **Posts:** 19

The pic mask set for IRQ12 is 0xEF on PIC2. Bit nr. 12 in word thus bit nr. 4 in byte for the dataport of pic 2.

Combuster · **Posted:** Mon Oct 24, 2011 6:08 am

That's only the second half of the answer :wink:

megatron23 · **Joined:** Sat Oct 22, 2011 3:03 pm **Posts:** 19

It seems I missed the plot a little. Then what would be the first half?

egos · **Joined:** Fri Nov 16, 2007 1:59 pm **Posts:** 612

I think he means PIC1 mask.

megatron23 · **Joined:** Sat Oct 22, 2011 3:03 pm **Posts:** 19

I dont send a mask to PIC1 if I want to enable IRQ12.

The IRQ1 for keyboard is enabled elsewhere. It works without problems if I don't initialize the mouse.

egos · **Joined:** Fri Nov 16, 2007 1:59 pm **Posts:** 612

Does mouse work fine? Check program step by step to localise the fragment where keyboard is missed. Read controller command byte again to check that it is correct.

megatron23 · **Joined:** Sat Oct 22, 2011 3:03 pm **Posts:** 19

After enabling interrupts IRQ12 fires once where neither bit 0 nor bit 5 ist set in the byte from port 0x64. my handler then does not read data from port 0x60 and returns instead.

after that everything works as it should except IRQ1 does not fire anymore.

egos · **Joined:** Fri Nov 16, 2007 1:59 pm **Posts:** 612

Controller command byte is the byte which you can read by command 20h. This byte contains "enable keyboard/mouse interrupt" bits and "disable keyboard/mouse" bits. Read and show this byte.

turdus · **Joined:** Tue Feb 08, 2011 1:58 pm **Posts:** 496

megatron23 wrote:

After enabling interrupts IRQ12 fires once where neither bit 0 nor bit 5 ist set in the byte from port 0x64.

That could take a while to set. Read and check it in a loop (timeout). For example I try it 1000 times before saying it was a false IRQ.

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[RESOLVED] ps/2 mouse initalization / keyboard interrupt

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