Generating keyboard interrupts on a MC13213 GT60 controller

McGillMike — Fri, 09 Mar 2007 05:51:14 GMT

right now, i have an isr reading:

__interrupt voidKBI_ISR(void) {

  //KBI1SC = cKBI1SC | cKBI1SC_Ack;
  if(KBI1SC & 0b00001000) //test if KBF set
  {
   KBI1SC &= 0b11111101; //disable KBIE
   //KBI1SC = cKBI1SC_Ack; //clear interrupt flag
   KBI1SC |= 0b00000100; //clear interrupt flag
   PWRLib_MCU_WakeupReason.Bits.FromKBI = 1;    //set KB event flag
  }

then, in main control, i read:

if (Res.Bits.FromKBI == TRUE )
    {
         LED4TOGGLE;
         debounceCounter = 0;
         while(debounceCounter<100)
           debounceCounter++;
         //while(debounceCounter<1000){;}
         debounceCounter = 0;
         /* IH_added functions to record keystroke */
         if(!(PTAD & (1<<5))) keyPressed |= KB4;
         if(!(PTAD & (1<<4))) keyPressed |= KB3;
         if(!(PTAD & (1<<3))) keyPressed |= KB2;
         if(!(PTAD & (1<<2))) keyPressed |= KB1;
         //TOGGLE_EXT_LED;
         //enable keyboard interrupts
         KBI1SC |= 0b00000010;
         keyState= KEY_PRESSED;
         /* clear kb interrupt flag */
         Res.Bits.FromKBI = FALSE;

}

in initialisation

PTAPE = 0b00111100;

PTADD = 0b00000001;

KBIPE = 0b00111100;

all this changes nothing because the PTAD pins stay at 00111100 all the time, none of the 4 1s ever drop to a 0. They stay 1s from beginning of startup to termination of program. I can generate the pushbutton event, but i never get any actual response in the ports. i cannot understand why it never drops to 0. Or better yet, its never 0 to begin with.

thanks.

Re: Generating keyboard interrupts on a MC13213 GT60 controller

snaeth — Sat, 10 Mar 2007 02:13:32 GMT

Im a bit of a newb, so forgive me if this is completely wrong, but from first looking at it, it looks like your are enabling the pull up resisters......giving you your for 1's.......and then you have those port A pins set as input.......so they are reading the 1's. those port A pins need to be set as output. so you can set those pins to the value you want, within the micro.

Re: Generating keyboard interrupts on a MC13213 GT60 controller

McGillMike — Sat, 10 Mar 2007 02:50:16 GMT

Actually, i fixed my problem. I wasn't checking for the right states. So youre right.

thanks.

topic Re: Generating keyboard interrupts on a MC13213 GT60 controller in 8-bit Microcontrollers

Generating keyboard interrupts on a MC13213 GT60 controller

Re: Generating keyboard interrupts on a MC13213 GT60 controller

Re: Generating keyboard interrupts on a MC13213 GT60 controller