atmega16 controls MAX7219 in digital tube display

#include

#define uchar unsigned char
#define uint unsigned int

uchar QIAN=0,BAI=0,SHI=0,GE=0;

void delay_ms(uint ms)
{
  uint i,j;
  for(i=ms;i>0;i--)
     for(j=1141;j>0;j--);
}

void System_Init(void)
{
  DDRB=0XFF;
  PORTB=0XFF;
}

void BCD_Change(uint data)
{ 
  uint TEN=0;        //Note the type of variable
  TEN=data;
  QIAN=TEN/1000;       //0x03e8=1000
  TEN% =1000;
  BAI=TEN/100;
  TEN%=100;
  SHI=TEN/10;
  TEN%=10;
  GE=TEN;
}

void MAX7219_SendData(uchar addr,uchar data)//Send the high bit first and then the low bit
{
  uchar i =0,j=0,a=0,temp=0;
  PORTB&=0Xbf;     //Pull LOAD low
  while(i<16)//LOAD/cs terminal at the same time or after the rising edge of the 16th clock, the next It becomes high level before the rising edge of the clock, otherwise the data will be lost
  {
     if(i<8)        //Determine whether to transmit the address or the data
        temp=addr;
     else
        temp=data;
     for(j=8;j>=1; j--)
     {
        a=temp;     
  a=a>>2;   //Shift the data to the right by 2, and shift the highest bit of the data to be transmitted to bit5 to facilitate the output
  of a=a&0x20;  //Remove it on the PB5 port The high and low bits of the data on BIT5
  PORTB&=0XDF;   //0XDF   1101 1111
  PORTB|=a;  //Output the highest bit of the data
  temp<<=1;       //Shift the data to the left by one bit and transmit the second highest bit of data, one cycle 8 transmissions completed
  PORTB&=0x7f;   //Pull CLK low
  PORTB|=0x80;   //Pull CLK high, data transmission on rising edge
     }
     i+=8;            //Judgment statement
  }
  PORTB|=0X40;   //LOAD=1,PB6 =1;
}

void MAX7219_SendData_(uchar addr,uchar data)
{
  uchar i=0,j=0,temp=0;
  PORTB&=0XBF;     //LOAD=0, PB6=0;
  for(i=0;i<8 ;i++)  //Transfer address
  {
     temp=addr;
     PORTB&=0X7F;   //SLK=0, data is transferred in on the rising edge of the clock
     if((temp&0x80)==0x80) //Determine whether the high bit is 1 or 0, if it is 1 Output 1 on PB7, otherwise output 0
     PORTB|=0X20;
     else
     PORTB&=0XDF;
  PORTB|=0X80;   //SLK=1, data is transferred in on the rising edge of the clock
  addr=addr<<1;   //The data is shifted left by one bit, transmit the second-highest data, and complete the transmission 8 times in one cycle
  }
  for(j=0;j<8;j++)  //Transmit data
  {
     temp=data;
     PORTB&=0X7F;    //SLK=0, data is on the rising edge of the clock Pass in
     if((temp&0x80)==0x80)//Determine whether the high bit is 1 or 0, if it is 1, output 1 on PB7, otherwise output 0
     PORTB|=0X20;
     else
     PORTB&=0XDF;
  PORTB|=0X80;  //SLK =1, data is transferred in at the rising edge of the clock
  data=data<<1;      //The data is shifted one bit to the left, the next highest bit data is transferred, and the transfer is completed 8 times in one cycle
  }
  PORTB|=0X40;   //LOAD=1,PB6= 1;
}

void MAX7219_Init(void)
{
  MAX7219_SendData_(0x0c,0x01);//Power-down mode: 0x01 indicates normal operation/0x00 indicates sleep mode
  MAX7219_SendData_(0x0f,0x00);//Display test mode: 0x00 indicates normal operation/0x01 Indicates display test mode
  MAX7219_SendData_(0x09,0xff);//Decoding mode: 0x00 means no decoding/0x01, 0x0f, 0xff means different decoding methods, 0xff means 7-segment decoding
  MAX7219_SendData_(0x0b,0x07);// Scan settings: 0x07 represents 8 digital tubes
  MAX7219_SendData_(0x0a,0x07); //Display brightness: the range is 0~f, here it is set to 7
}

void Display_time(void)
{
   MAX7219_SendData_(0x01,1);
 MAX7219_SendData_(0x02,1);
 MAX7219_SendData_(0x03,0x0a);
 MAX7219_SendData_(0x04,2);
 MAX7219_SendData_(0x05,6);
 MAX7219_SendData_ (0x06,0x0a);
 MAX7219_SendData_( 0x07,3);
 MAX7219_SendData_(0x08,0);
}

void Display_date(void)
{
  
  MAX7219_SendData(0x01,QIAN);
  MAX7219_SendData(0x02,BAI);
  MAX7219_SendData(0x03,SHI);
  MAX7219_SendData(0x04,0X80|GE );
  MAX7219_SendData (0x05,1);
  MAX7219_SendData(0x06,0x80|2);
  MAX7219_SendData(0x07,2);
  MAX7219_SendData(0x08,8);
}

void main(void)
{
  System_Init();
  MAX7219_Init();
  BCD_Change(2010);
  while (1)
  {
     Display_time();
  delay_ms(2000);
  Display_date();
  delay_ms(2000);
  }
}

PROTUES7.5 policy map