starter,want help!

hello,every body.

sorry for my poor english,my first language is not englsh.i began to learn niosII about two weeks ago,and i want to design a fpga which contains a soft cpu core to replace MCU(MCS-51,e.g.8031).The c code of the 8031 are partly as follows:# include <reg51.h># include <intrins.h># include <absacc.h>

long i,j;

sbit p10=P1^0;

sbit p11=P1^1;

sbit p12=P1^2;

sbit p14=P1^4;

sbit p15=P1^5;

sbit p13=P1^3;

........

........

........

main()

{

InitializeA();

TMOD=0x20;

TL1=0xfd;TH1=0xfd;

PCON=0x00;

TR1=1;

p11=0; p11=1

xx=0;

while(1)

{

p11=1;

//delay(20);

p11=0;

//delay(20);

p11=1;

p12=0;

p13=1;

p10=0;

p10=1;

i=0;

p15=1;

xx=p15;

while (xx==0)

{

p15=1;

xx=p15;

}

p15=1;

xx=p15;

if(xx==1)

p11=0;

p11=1;

p12=1;

for(i=0;i<286;i++)

{//for1

for(j=0;j<360;j++)//720

{ //for2

P0=0xff;

re_am=P0;

if(j<359) //718 359

{

SBUF=re_am;

while(TI==0)

{

}

TI=0; //delay(5);

}

P2=0xff;

re_am=P2;

if(j<359)//359

{

SBUF=re_am;

while(TI==0)

{

}

TI=0; //delay(5);

}

p13=0;p13=1;

} //for2

} //for1

}//if_end

}//first while_end

}

i want to write this code into niosII,and use the cpu soft core to achieve the fuctions play by the MCU.

as show above,MCU uses p10...p17 as control signals,how can i achieve this in nios?can i use PI/Os to replay p10...p17 to play control fuctions?if it does,how can i link the p10...p17 to the PI/Os in c code?

and SBUF in MCU is a serial port,can i use UART to replace it?and the examples altera provides always use UART to transfer charicters,then how can i use it to transfer control signals,as 0,1?

i think the function i want to achieve is not difficult,but i am a poor starter,and i have been confused with it for a long time .can you help me with it ,kind persons?