[SOLVED] mikroC Increment and decrement

[IcyWolfBrain]

Hey guys, i need help in MikroC programming PIC16F877A processor. So i need do to increment and decrement 7 segment display with two diferrent buttons (one to increment/ other decrement) (Shematic in photo). Increment for me is working but decrement i dont know how to implement.

My Code:

bit state, prev_state;
int i=0;
void main(){

 portd=0;
 trisd=0b00000000;

 while(1){

  state=portb.b0;
  if(prev_state!=state){

  if(state==0)i++;
   if(i>9) i=0;
   //portb=i;
   prev_state=state;

  }
 

 switch(i){
           case 0: portd=0b00111111; break;
           case 1: portd=0b00000110; break;
           case 2: portd=0b11011011; break;
           case 3: portd=0b01001111; break;
           case 4: portd=0b01100110; break;
           case 5: portd=0b01101101; break;
           case 6: portd=0b11111101; break;
           case 7: portd=0b00000111; break;
           case 8: portd=0b11111111; break;
           case 9: portd=0b11101111; break;

           }

  }
}

 

[betwixt]

while(1)
{
  state=portb.b0;       // read the current port state
  if(prev_state!=state) // see if its contents have changed
  {
    if(portb.b0 == 0) i++;  // increment i if b0 switch is closed
    if(portb.b7 == 0) i--;  // decrement it if b7 switch is closed

    if(i < 0) i = 0;    // restrict the range if necessary
    if(i > 9) i = 9;

    prev_state=state;   // only allow one pass until switch changes again
  }
}

I don't use MikroC to check it but the code above should give you some ideas. Note that you might have to debounce the switches to avoid one press appearing to repeat.

Brian.

 

[Dan1138]

Here's my idea:

unsigned char state, prev_state;
unsigned char i;

void main(){

 portd = 0;
 trisd = 0b00000000;
 i = 0;
 prev_state = 0;

while(1){

  state = 0;

  if(portb.b0 == 0) state = state + 1;
  if(portb.b7 == 0) state = state + 2;

  if(prev_state!=state){

    switch(state){
           case 0: /* no buttons pressed */
            break;

           case 1: /* increment button pressed */
            if(i < 9) i++;
            else i = 0;
            break;

           case 2: /* decrement button pressed */
            if(i > 0) i--;
            else i = 9;
            break;

           case 3: /* both buttons pressed */
            break;
    }

    prev_state=state;

    switch(i){          /* .gfedcba */
           case 0: portd=0b00111111; break;
           case 1: portd=0b00000110; break;
           case 2: portd=0b01011011; break;
           case 3: portd=0b01111001; break;
           case 4: portd=0b01100110; break;
           case 5: portd=0b01101101; break;
           case 6: portd=0b01111101; break;
           case 7: portd=0b00000111; break;
           case 8: portd=0b01111111; break;
           case 9: portd=0b01101111; break;
    }
  }
}