51 single chip microcomputer read and write max186 c51 program

//The returned data is a 12-bit int

//max186 channel ch0 corresponds to 0, which is max186 pin 1
//max186 channel ch1 corresponds to 1, which is max186 pin 2
//max186 channel ch2 corresponds to 2, which is max186 pin 3
//max186 channel ch3 corresponds to 3, which is max186 pin 4
//max186 channel ch4 corresponds to 4, which is max186 pin 5
//max186 channel ch5 corresponds to 5, which is max186 pin 6
//max186 channel ch6 corresponds to 6, which is max186 pin 7
//max186 channel ch7 corresponds to 7, which is max186 pin 8
//For example: int ch3;
// ch3=ad186(3);
//ch3 is the analog voltage signal input from the 4th pin of max186, the unit is mv. If the 4th pin (ch4) of max186 inputs a voltage of 1.000 volts, it returns 0x3E8H (that is, 1000 in decimal).
//Similarly: ad186 (4) represents the signal input from the 5th pin (ch4). (See the attached picture)

uint ad186(uchar ss) 
    {         
uchar i,kki,s; 
    uint i_da ta,i_datatransfer,addata;
switch(ss)
{
   case 0: s=0x8E;break;
case 1: s=0xCE;break;
case 2: s= 0x9E;break;
case 3: s=0xDE;break;
   case 4: s=0xAE;break;
case 5: s=0xEE;break;
case 6: s=0xBE;break;
case 7: s=0xFE;break;

default: s=0xAE;break;
}

        CS=1; 
        SCLK=0; 
            CS=0; 
            SCLK=0; 
            for(i=0;i<8;i++) 
            { 
                uchar adaddresstransfer; 
                adaddresstransfer=s; 
                adaddresstransfer=(adaddresstransfer>>(7-i))&0x01; 
                DIN=adaddresstransfer; 
                SCLK=1; 
                for(kki=0;kki<2;kki++); 
                SCLK=0; 
            } 
            CS=1; 
            for(i=0;i<6;i++);     
            CS=0; 
            SCLK=1 ; 
            for(i=0;i<12;i++) 
            { 
            SCLK=1;     
            SCLK=0; 
            i_datatransfer=DOUT; 
            i_datatransfer=i_datatransfer<<(11-i); 
            i_da ta=i_da ta|i_datatransfer; 
            } 
            addata=i_da ta ; 
            for(i=0;i<4;i++) 
            { 
            SCLK=1; 
            SCLK=0; 
            } 
           CS=1; 
           i_da ta=i_datatransfer=0; 
     delay(5);
     return(addata);
    }