Hi all,

I am using m32c87 with starter kit and i am "starter" to microcontroller wants to learn a lot.

I have a program that displays a menu which has 5 or more submenus. When i push the button, submenus in the display goes below. Program is like that;

unsigned volatile char mmm = 0x00;

void main(void)   
{
unsigned int ii;
char ucStr[5][6]= {"menu0","menu1","menu2","menu3","menu4"};
char far *p;
char degis[8]=0;
InitialiseDisplay();
p=&degis;
while(1)
{
  for(ii=0;ii<8;ii++)
  {
   degis[ii]=ucStr[mmm][ii];
  }
  DisplayString(LCD_LINE1,p);
}
}       

DisplayString is obviously take the char to LCD. I directly copied from tutorial. And this is my ISR;

#pragma INTERRUPT INT_INT0
void INT_INT0(void)
{
 
unsigned long delay=0x3F;
while(delay--);
mmm++%5;
asm("NOP");
sayac++;
return;
}

Sayac means nothing. mmm goes to +1 and LCD displays another submenus. This is very simple for c.However this is not working.

The problem is, when i push the switch, interrupt service rutine works 2 or 3 times. So firstly, menu0 appear, than menu2 than again menu0.

What do you think about that? What can be the problem?

And also, i am trying to do some kind of works with the starter kit(using timers adc's or anything else) Do you have an idea that there are some ways to improve myself correctly and fast?