利用静态数码管实现从9到0 再从0到9

#include
unsigned char code ledchar[] = {
    0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8,
    0x80, 0x90} ;
#define led P0
void zs();
void main()
{
unsigned char cnt;
int i=9;
TMOD=0x01;
TH0=0XB8;
TL0=0X00;
TR0=1;
while(1)
{
if(TF0==1)
{
TF0=0;
TH0=0XB8;
TL0=0X00;
cnt++;
}
if(cnt>=50)
{
cnt=0;
led=ledchar[i];
i--;
if(i<0)
{
zs();
}


}
}
}
void zs()
{
  unsigned char cnt;
int i=0;
TMOD=0x01;
TH0=0XB8;
TL0=0X00;
TR0=1;
while(1)
{
if(TF0==1)
{
TF0=0;
TH0=0XB8;
TL0=0X00;
cnt++;
}
if(cnt>=50)
{
cnt=0;
led=ledchar[i];
i++;



}
}
}