Touchscreen Action Function Keypad

void action5_51(void){
    unsigned long parameters[3]={0,0,0};
    uint8_t i=0,tokencounter=1,tokencounterold=1;
    char buf[9];
    bool nextsubstract=true;
    T6963cWriteChunkAt_P(T6963C_ADDR_GRAPHIC,Settings,sizeof(Settings));
    //Reading Settings from display
    T6963cPutStringXY_P(0,1,PSTR("F start:"));
    T6963cPutStringXY_P(0,2,PSTR("F step :"));
    T6963cPutStringXY_P(0,3,PSTR("F stop :"));
    T6963cPutStringXY_P(2,4,PSTR("Values(Khz)"));
    T6963cCursorBlinkTxtGrph(1);
    T6963cCursorPattern(1);
    T6963cSetCursorXY(8,1);

    while (stateEventEval(currentState,cor[0],cor[1]) != ENTER)
    {
        coord = touch_read(5,tchcal);
        cor[0] = *coord;
        cor[1] = *(coord+1);
        switch (stateEventEval(currentState,cor[0],cor[1]))
        {
        case NUM0 : if (parameters[i]!=0 &&tokencounter<8)
        {parameters[i] *= 10;tokencounter++;}       break;
        case NUM1 : if (tokencounter < 8)
        {parameters[i] *= 10;parameters[i] += 1;tokencounter++;}    break;
        case NUM2 : if (tokencounter < 8)
        {parameters[i] *= 10;parameters[i] += 2;tokencounter++;}    break;
        case NUM3 : if (tokencounter < 8)
        {parameters[i] *= 10;parameters[i] += 3;tokencounter++;}    break;
        case NUM4 : if (tokencounter < 8)
        {parameters[i] *= 10;parameters[i] += 4;tokencounter++;}    break;
        case NUM5 : if (tokencounter < 8)
        {parameters[i] *= 10;parameters[i] += 5;tokencounter++;}    break;
        case NUM6 : if (tokencounter < 8)
        {parameters[i] *= 10;parameters[i] += 6;tokencounter++;}    break;
        case NUM7 : if (tokencounter < 8)
        {parameters[i] *= 10;parameters[i] += 7;tokencounter++;}    break;
        case NUM8 : if (tokencounter < 8)
        {parameters[i] *= 10;parameters[i] += 8;tokencounter++;}    break;
        case NUM9 : if (tokencounter < 8)
        {parameters[i] *= 10;parameters[i] += 9;tokencounter++;}    break;
        case NUMENTER :
            i += 1;tokencounter=1;tokencounterold=1;
            nextsubstract=true;
        break;
        case NUMBACK :
        if(tokencounter!=0)
        {
            if (parameters[i] != 0)
                {
                    parameters[i] -= (parameters[i] % 10);
                    parameters[i] /=10;
                    if(tokencounter != 1){tokencounter-=1;}else{}
                }else{nextsubstract = true;}
        }
            break;
        }
            if (nextsubstract==true && tokencounter != tokencounterold){tokencounter--;nextsubstract=false;}
            tokencounterold = tokencounter;
        //  if(i>=3)break;
            T6963cSetCursorXY((7+tokencounter),(1+i));

            CsettingsFStart = parameters[0];
            sprintf(buf,"%lu",parameters[0]);
            //fillwithspaces(buf,9);
            T6963cPutStringXY(8,1,buf);


            CsettingsFStep =  parameters[1];
            sprintf(buf,"%lu",parameters[1]);
            //fillwithspaces(buf,9);
            T6963cPutStringXY(8,2,buf);

            CsettingsFStop =  parameters[2];
            sprintf(buf,"%lu",parameters[2]);
            //fillwithspaces(buf,9);
            T6963cPutStringXY(8,3,buf);

    }
    //Disable cursor
    T6963cCursorBlinkTxtGrph(0);
    fireEventENTER = true;
}