Elevator Dot Matrix counter using PIC16F877A

HI,
I need to make a circuit using PIC16F877A and 5x8 dot matrix display to make an elevator counter which display the number of floor using gray code as input signal.
i want to count 16 floor from G to floor 15.
the power to the circuit is 24 VDC .
CAN ANY BODY HELP WITH THE CIRCUIT CODE IN C LANGUGE OR THE SCHEMATIC CIRCUIT ON PROTUES as it is the first time for me to use dot matrix with pic microcontrollers.
thanks in advance

Hi I have some code that I used long time back to test a 5x7 dot matrix display. At that time I was trying to make a car number gear display used in rally cars. It is very basic. It used a 4017 decade counter to switch columns and rows are connected to the PIC. if you use the 16F877, you will have more than enough pins to multiplex it.


// MODIFIED for 16F628
#include <pic.h>
#include <pic16f6x.h>
#include "delay.h"
#include "delay.c"

#define XTAL_FREQ 4MHZ
__CONFIG(0x3F30); // no crystal required


#define PORTBIT(adr, bit) ((unsigned)(&adr)*8+(bit))


static bit r0 @ PORTBIT(PORTB, 0); // row0
static bit r1 @ PORTBIT(PORTB, 1); // row1
static bit r2 @ PORTBIT(PORTB, 2); // row2
static bit r3 @ PORTBIT(PORTB, 3); // row3
static bit r4 @ PORTBIT(PORTB, 4); // row4
static bit r5 @ PORTBIT(PORTB, 5); // row5
static bit r6 @ PORTBIT(PORTB, 6); // row6
static bit clk @ PORTBIT(PORTB, 7); // 4017 clock

static bit rst @ PORTBIT(PORTA, 0); // stwitch position 1
static bit pos2 @ PORTBIT(PORTA, 1); // stwitch position 2
static bit pos3 @ PORTBIT(PORTA, 2); // stwitch position 3
static bit pos4 @ PORTBIT(PORTA, 3); // stwitch position 4
static bit pos5 @ PORTBIT(PORTA, 4); // stwitch position 5

void clock();
void reset();

//main function
void main(void)
{

TRISB = 0b00000000; // all outputs
TRISA = 0b00000001; // 1st output rest inputs
PORTB = 0b11111111; // all off
CMCON = 0b00000111; // disable comparators

while(1)
{
PORTB= 0x3E;
clock();
PORTB= 0x11;
clock();
PORTB= 0x11;
clock();
PORTB= 0x11;
clock();
PORTB= 0x3E;
reset();





}


}


void clock()
{
clk=0;
clk=1;
DelayMs(10);
clk=0;
}

void reset()
{
rst=0;
rst=1;
DelayMs(10);
rst=0;
}