ra2 pininde buton çalışmıyor

merhabalar ,elimde 8x8 dotmatris 16f628-74595-3 buton ile çoçuğum için 1. butona basınca harfleri 2. butona basılınca şekilleri 3 butona basınca sayıları gösteren devre yaptım . b portu tamamen çıkış

a portu ra0-ra1 74595 kontrolü için(clock ve data lanchı da clok verdim )ra2 portun a 3,buton ra3 e 2cı buton ra4e 1.. butonu koydum . programı yazdım ama ne yapyıysam ra2 yı buton grişi olarak tanımlayamadım

program aşağıdadır . devre 2 buton olarak istenilen gibi çalışıyor sayı butonu basmıyor

#include "16F628.H"

#FUSES XT,NOWDT,NOPROTECT,NOLVP,NOPUT,NOCPD

#use delay(clock=4000000)//PIC OSİLATÖRU 4Mhz SECİLİYOR

#use fast_io(b)//HIZLI GIRIŞ CIKIŞ AYARI

#use fast_io(a)

int i=0,f=0,x=150,y=0,Z=0,a=0,b=0,c=0,h=0;//

const char harf[208]={

255,243,237,222,192,222,222,222,//A

255,224,222,222,224,222,222,224,//B

255,225,222,254,254,254,222,225,//C

255,224,222,222,222,222,222,224,//D

255,224,254,254,240,254,254,224,//E

255,224,254,254,248,254,254,254,//F

255,225,254,254,224,238,238,224,//G

255,238,238,238,224,238,238,238,//H

255,224,251,251,251,251,251,224,//I

251,255,224,251,251,251,251,224,//İ

255,239,239,239,239,239,238,241,//J

255,238,246,250,252,250,246,238,//K

255,254,254,254,254,254,254,224,//L

255,238,228,234,238,238,238,238,//M

255,238,236,236,234,230,230,238,//N

255,241,238,238,238,238,238,241,//O

245,255,241,238,238,238,238,241,//Ö

255,240,238,238,238,240,254,254,//P

255,224,238,238,240,246,238,222,//R

255,241,238,254,241,239,238,241,//S

255,224,251,251,251,251,251,251,//T

255,238,238,238,238,238,238,241,//U

245,255,238,238,238,238,238,241,//Ü

255,238,238,238,238,238,245,251,//V

255,238,238,245,251,251,251,251,//Y

255,224,239,247,251,253,254,224,//Z

};

const char sayi[80]={

255,241,238,238,238,238,238,241,//0

255,251,249,250,251,251,251,224,//1

255,241,238,239,247,251,253,224,//2

255,241,238,239,243,239,238,241,//3

255,247,251,253,254,246,224,247,//4

255,224,254,224,239,239,238,225,//5

255,241,238,254,240,238,238,241,//6

255,192,223,239,247,251,251,251,//7

255,241,238,238,241,238,238,241,//8

255,241,238,238,241,239,239,241,//9

};

const char sekil[208]={

24,60,90,231,231,90,60,24,//baklava

231,219,189,126,189,189,165,165,//ev

201,128,128,193,227,247,255,255,//kalp

90,189,90,231,231,90,189,90,//baklava2

128,221,235,247,235,221,128,255,//kumssati

235,247,118,129,118,247,247,235,//dron

247,235,221,190,221,235,247,255,//yamuk

243,235,171,0,171,235,235,243,//okyay

239,207,128,0,128,207,239,255,//oksağ

255,255,219,255,255,126,189,195,//gülen surat

255,255,219,255,255,195,189,126,//somurtan surat

255,190,213,227,193,227,213,190,//kartane

239,199,131,239,239,0,129,195,//gemi

251,193,222,239,247,51,129,192,//kuğ

255,255,219,255,255,195,219,195,//şaşkın surat

189,219,231,0,126,126,126,0,//tv

255,252,252,0,84,124,255,255,//anahtar

247,227,193,128,227,227,227,227,//yukarıok

247,243,1,0,1,243,247,255,//solok

227,227,227,227,128,193,227,247,//aşağıok

227,227,247,193,247,247,235,221,//cinali

0,126,66,90,90,66,126,0,//içiçekare

247,227,193,128,255,255,255,255,//üçgen

255,99,93,30,93,99,255,255,//balık

223,239,247,195,223,239,247,251,//yıldırım

193,182,182,128,136,128,193,213,//kurukafa

};

void ekranset(){for(i=0;i<9;i++){output_a(1);

delay_ms(1);

output_a(0);

delay_ms(1);}}

void int ekran(a){output_a(3);

delay_ms(1);

output_a(0);for(i=0;i<9;i++){output_b(harf[a+i]);

output_a(1);

delay_ms(1);

output_a(0);}

}

void int ekran1(a){output_a(3);if(a>72){a=0;}

delay_ms(1);

output_a(0);for(i=0;i<9;i++){output_b(sayi[a+i]);

output_a(1);

delay_ms(1);

output_a(0);}

}

void int ekran2(a){output_a(3);

delay_ms(1);

output_a(0);for(i=0;i<9;i++){output_b(sekil[a+i]);

output_a(1);

delay_ms(1);

output_a(0);}

}

void int anaekran(h){

if(h==8){ekran(a);}

if(h==4){ekran1(a);}

if(h==16){ekran2(a);}

}

void main()

{

  setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);

  setup_timer_1(T1_DISABLED);

  setup_timer_2(T2_DISABLED,0,1);

  setup_comparator(NC_NC_NC_NC);

  setup_vref(VREF_LOW|-2);

  set_tris_a(0x38);//gıriş cıkış belirleniyor

set_tris_B(0x00);

ekranset();

while(1){

h=input_a();a=a+8;if(a>200){a=0;}

while(h>0){z=h; h=input_a(); anaekran(z);}

while(h==0){h=input_a();anaekran(z);}

}

}

 setup_vref(VREF_LOW|-2); komut satırını çıkartım düzeldi saygılarımla