51单片机用矩阵键盘控制数码管,求助大佬-创新互联

从黑体的地方开始,我想通过矩阵键盘控制数码管显示0-15,但是不知道怎么搞两位数的显示,是不是延时什么的有问题
#include

sfr P4 = 0xC0;
unsigned char code duanma[18]={
  0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,
0x80,0x90,0x88,0x80,0xc0,0x86,0x8e,0xbf,0x7f};
sbit R1 = P3^0;
sbit R2 = P3^1;
sbit R3 = P3^2;
sbit R4 = P3^3;

sbit C1 = P3^4;
sbit C2 = P3^5;
sbit C3 = P4^2;
sbit C4 = P4^4;

void HC573(unsigned char one)
{
  switch(one)
  {
  case 4:
  P2 = (P2 & 0x1f) | 0X80;
  break;
  case 5:
  P2 = (P2 & 0x1f) | 0xa0;
  break;
  case 6:
  P2 = (P2 & 0X1f) | 0Xc0;
  break;
  case 7:
  P2 = (P2 & 0X1f) | 0Xe0;
  break;
  }
   }

void Delay(unsigned char t)
{
  while(t--);
}
void SHUMA(unsigned char two, unsigned char thr )
{
  HC573(6);
  P0 = 0x01<< thr;
  HC573(7);
  P0 = two;
}
unsigned char num = 0, yum = 0;
void Juzhen()
{
  C1 = 0; C2 = C3 = C4 = 1;
  R1 = R2 = R3 = R4 = 1;
  if(R1 == 0)
  {
  while(R1 == 0);
  num =0  ;
  SHUMA(duanma[num],1);
  }
  else if(R2 == 0)
  {
  while(R2 == 0);
  num = 1 ;
  SHUMA(duanma[num],1);
  }
  else if(R3 == 0)
  {
  while(R3 == 0);
  num =  2;
  SHUMA(duanma[num],1);
  }
  else if(R4 == 0)
  {
  while(R4 == 0);
  num =  3;
  SHUMA(duanma[num],1);
  }
  C2 = 0; C1 = C3 = C4 = 1;
  R1 = R2 = R3 = R4 = 1;
  if(R1 == 0)
  {
  while(R1 == 0);
  num =  4;
  SHUMA(duanma[num],1);
  }
  else if(R2 == 0)
  {
  while(R2 == 0);
  num =  5;
  SHUMA(duanma[num],1);
  }
  else if(R3 == 0)
  {
  while(R3 == 0);
  num =  6;
  SHUMA(duanma[num],1);
  }
  else if(R4 == 0)
  {
  while(R4 == 0);
  num =  7;
  SHUMA(duanma[num],1);
  }
  C3 = 0; C2 = C1 = C4 = 1;
  R1 = R2 = R3 = R4 = 1;
  if(R1 == 0)
  {
  while(R1 == 0);
  num =  8;
  SHUMA(duanma[num],1);
  }
  else if(R2 == 0)
  {
  while(R2 == 0);
  num =  9;
  SHUMA(duanma[num],1);
  }
  else if(R3 == 0)
  {
  while(R3 == 0);
  num = 0 , yum = 1;
  SHUMA(duanma[num],1);
  Delay(100);
  SHUMA(duanma[yum],0);
  Delay(100);
  }
  else if(R4 == 0)
  {
  while(R4 == 0);
  num = 1,yum = 1 ;
  SHUMA(duanma[num],1);
  Delay(100);
  SHUMA(duanma[yum],0);
  while(R4 == 0);
  }
  C4 = 0; C2 = C3 = C1 = 1;
  R1 = R2 = R3 = R4 = 1;
  if(R1 == 0)
  {
  while(R1 == 0);
  num = 2,yum = 1 ;
  SHUMA(duanma[num],1);
  Delay(500);
  SHUMA(duanma[yum],0);
  }
  else if(R2 == 0)
  {
  while(R2 == 0);
  num = 3,yum = 1 ;
  SHUMA(duanma[num],1);
  Delay(500);
  SHUMA(duanma[yum],0);
  }
  else if(R3 == 0)
  {
  while(R3 == 0);
  num = 4,yum = 1 ;
  SHUMA(duanma[num],1);
  Delay(500);
  SHUMA(duanma[yum],0);
  }
  else if(R4 == 0)
  {
  while(R4 == 0);
  num = 5 ,yum = 1;
  SHUMA(duanma[num],1);
  Delay(500);
  SHUMA(duanma[yum],0);
  }
}

void main()
{
  while(1)
  {
  Juzhen();
  }
}

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