topic Re: Keyboard interrupt problem in 8-bit Microcontrollers

MC9S08GT16A - Keyboard interrupt problem

sm — Thu, 29 Oct 2020 08:42:18 GMT

Hello,

I work with a MC9S08GT16A.

I have an interrupt whan I press my Button, but not every time I remove my finger.

You can see below my configuration:

Is there an errata sheet with this kind of problem?

I thank you a lot.

Code:

//PULL-UP for my BP.  PTAPE_PTAPE4 = 1;   KBIPE_KBIPE4 = 1;    KBISC_KBIE   = 1;    KBISC_KBIMOD   = 0;    KBISC_KBEDG4   = 0;   void interrupt 3 It_BP(void){    if  (KBISC_KBF == 1)   {      KBISC_KBIE  = 0;      KBISC_KBACK  = 1;                                                *  ==>     I send here a tempo of 30 ms.     And call after the following function.     }   } // end of It_BPvoid ihmTraiterTempoValidationBP(void){   *  ==> Button pressed<=> ihmEtatBP = TRUE;    if( ihmEtatBP != drvIhmTesterEtatLAB())    {                          KBISC_KBIE = 1;               if (ihmEtatBP == TRUE)      {           ihmEtatBP = FALSE;      }      else      {        ihmEtatBP = TRUE;      }            }} // end of ihmTraiterTempoValidationBP

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Alban Edit: Please include FSL Part Number in all Message Subjects line.

Message Edited by Alban on 2007-08-01 08:07 PM

Re: Keyboard interrupt problem

bigmac — Thu, 02 Aug 2007 00:32:49 GMT

Hello,

It is not entirely clear what you are hoping to achieve. You appear to have set up the KBI module so that PTA4 should cause an interrupt to occur on a negative edge, presumably when the button is pressed. It then seems you intend to disable the KBI interrupt (for a period of 30ms ??). Whether or not you would get a further interrupt when the button is released would depend on KBI interrupt being re-enabled, and whether there was any contact bounce on release. If no bounce, no interrupt since a negative edge remains selected.

However, there seems to be another problem with your posted code - should not the KBI module use vector 22, rather than vector 3?

Regards,

Mac

Re: Keyboard interrupt problem

sm — Thu, 02 Aug 2007 15:43:35 GMT

Hello,

I maintain, Interrupt vector is the 3rd.

I treat the bounce(100 ms), but I do not inverse the polarity with KBISC_KBEDG.

1 interrupt on 10 do not rise.

...

Re: Keyboard interrupt problem

Alban — Thu, 02 Aug 2007 15:54:00 GMT

Hello,

Interrupts are numbered from the top address of 0xFFFF.
Vector 3 is LVD.

Cheers,
Alban.