Digital tube display program based on AD conversion of single chip microcomputer

*This example uses the AD0804 chip, hardware circuit: cs chip select terminal connected to P2.3, WR write data terminal write to P3.6, RD read data terminal connected to P3.7, latch terminal connected to P2.6 pin, digital tube bit select terminal connected to P3.2, P3.3, P3.4 respectively, segment select terminal connected to P1 port*/
#include//header file
#define uint unsigned int//macro file
#define uchar unsigned char//macro file
uchar num;//variable
void delay3(uint z);//delay definition
void dissy();//delay function definition
sbit ge=P3^2;//ones digit definition
sbit shi=P3^3;//tens digit definition
sbit bai=P3^4;//hundreds digit definition
sbit ad_cs=P2^3;//chip select terminal
sbit ad_wr=P3^6;//write data terminal
sbit ad_rd=P3^7;//read data end
sbit pian=P2^6;//latch chip select
void add();//ad conversion sub-function
void delay(uint i);//delay sub-function declaration
uchar code table[]={
0xc0,0xf9,0xa4,0xb0,0x99,
0x92,0x82,0xf8,0x80,0x90,
0x88,0x83,0xc6,0xa1,0x86,
0x8e
};//array

/************Main function**********/
void main()
{
while(1)
{
add();//Call AD conversion sub-function
dissy();//Digital tube display sub-function
}
}

/************AD conversion sub-function**********/
void add()//AD conversion sub-function
{
uchar i;
ad_cs=1;//turn off the chip selectad_cs
=0;//turn on the chip selectad_wr
=1;//write the rising
edgead_wr=0;//write the falling
edgead_wr=1;//write the rising edge

P1=0xff;//Send number to P0
portad_rd=1;//Read rising
edgedelay(25);//Delay for a whilead_rd
=0;//Read falling edge
//////**************Because the AD conversion time cycle is long, my current digital tube does not use latches, and the AD conversion time is greater than the display time, so it will flicker when displayed. The solution to this problem is to call the display subroutine seven times in succession, so that the display time is consistent with the AD conversion time, and the displayed number will not flicker********************//////
for(i=0;i<7;i++) //Call 7 times, equivalent to delay(255)
void dissy();
//////**************************************//////
num=P1;//Give the number to the counter num
}

/************Display sub-function**********/
void dissy()//Display sub-function
{
P0=table[num/100];//Hundreds display data
bai=0;//Hundreds open
delay(14);//Delay for a while
bai=1;//Close hundreds
P0=table[num%100/10];//Tens display data
shi=0;//Tens open
delay(14);//Delay for a while
shi=1;//Close tens
P0=table[num%10];//Hundreds display data
ge=0;//Close tens
delay(14);//Delay for a while
ge=1;//Close tens
}

/**************Delay sub-function*************/

void delay(uint i) //delay function
{
uint j,k; //define variables
for(j=i;j>0;j--) //outer loop
for(k=30;k>0;k--); //inner loop
}