如何用STC89C52来驱动ADS1256的AD转换

我写了一个代码，还是不行，求各位精通这方面的工程师指教一下，感激不尽

#include<reg52.h>
#include<stdio.h>
#include<intrins.h>

#define uchar unsigned char
#define ulong unsigned long
#define uint unsigned int

sbit ***=P1^0;

sbit mosi=P1^1;

sbit miso=P1^2;

sbit ss=P1^3;

sbit dula=P2^6;

sbit wela=P2^7;

sbit rst=P1^4;

uchar code table[]={0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};

/////////////////////////////////////////
void nop(void)
{
;
}
/////////////////////////////////////////
void delayms(uint xms)
{
uint i,j;
for(i=xms;i>0;i--)
for(j=110;j>0;j--);
}

void delayus(uchar a) //ͦʱ1uS
{
uint i=0,j=0;
for(i=0;i<a;i++)
for(j=0;j<50;j++);
}
///////////////////////////////////////////////////
uchar data_receive(void) //ÊÕ×Ö½ÚÒ»Êý¾Ý
{
uchar i,dat=0,temp;
bit bt;
***=1;
delayms(10);
miso=1;
ss=0;
nop();
nop();
for(i=0;i<8;i++)
{
***=1;
nop();
nop();
***=0;
delayms(10);
nop();
nop();
bt=miso;
if(bt)
temp=0x01;
else
temp=0x00;
dat=(dat<<1);
dat=(dat|temp);
}
ss=1;
***=1;
delayms(10);
return dat;
}
////////////////////////////////////////////////////
void dat_transmit(uchar dat) //·¢Ò»×Ö½ÚÊý¾Ý
{
uchar i,datbuf;
datbuf=dat;
ss=0;
//while(ss!=0);

for(i=0;i<8;i++)
{
***=0;
delayms(10);
if(datbuf&0x80)
miso=1;
else
miso=0;
datbuf=(datbuf<<1);
***=1;
delayms(10);
}

}

////////////////////////////////////////////
void display (uchar qianwang,uchar baiwang,uchar shiwang,uchar wang,uchar qian,uchar bai,uchar shi,uchar ge)
{
dula=1;
P0=table[qianwang];
dula=0;
P0=0xff;
wela=1;
P0=0xfe;
wela=0;
P0=0xff;
delayms(5);

dula=1;
P0=table[baiwang];
dula=0;
P0=0xff;
wela=1;
P0=0xfd;
wela=0;
P0=0xff;
delayms(5);

dula=1;
P0=table[shiwang];
dula=0;
P0=0xff;
wela=1;
P0=0xfb;
wela=0;
P0=0xff;
delayms(5);

dula=1;
P0=table[wang];
dula=0;
P0=0xff;
wela=1;
P0=0xf7;
wela=0;
P0=0xff;
delayms(5);

dula=1;
P0=table[qian];
dula=0;
P0=0xff;
wela=1;
P0=0xef;
wela=0;
P0=0xff;
delayms(5);

dula=1;
P0=table[bai];
dula=0;
P0=0xff;
wela=1;
P0=0xdf;
wela=0;
P0=0xff;
delayms(5);

dula=1;
P0=table[shi];
dula=0;
P0=0xff;
wela=1;
P0=0xbf;
wela=0;
P0=0xff;
delayms(5);

dula=1;
P0=table[ge];
dula=0;
P0=0xff;
wela=1;
P0=0x7f;
wela=0;
P0=0xff;
delayms(5);
}

///////////////////////////////////////////////////
void ads_reg(uchar reg,uchar dat1) //д¼Ä´æÆ÷ºÍµØÖ·Êý¾Ý
{
ss=0;

dat_transmit(0x50+reg);
dat_transmit(0x00);
dat_transmit(dat1);
ss=1;
delayus(1);
}
///////////////////////////////////////
void ads1256_into(void)
{
rst=0;

nop();

rst=1;

ads_reg(00,0xf0);//STATUS

ads_reg(01,0x10);//MUX

ads_reg(02,00);//ADCOM

ads_reg(03,0xf0);//DTATE

ads_reg(04,0x0f);//IO

}

/////////////////////////
void main()
{
uchar a,A1=0,A2=0,A3=0,A4=0,A5=0,A6=0,A7=0,A8=0,adval=0;
ads1256_into();
while(1)
{
adval=data_receive();
P0=0xff;

for(a=10;a>0;a--)
{
display(A1,A2,A3,A4,A5,A6,A7,A8);
}

A1=adval/10000000;
A2=adval%10000000/1000000;
A3=adval%1000000/100000;
A4=adval%100000/10000;
A5=adval%10000/1000;
A6=adval%1000/100;
A7=adval%100/10;
A8=adval%10;
}
}