缘由怎么让单片机数码管实现第一位开始走0~9,1s后第二位再开始亮? - 24小时必答区

#include "REG52.h"
void sm7447(unsigned char mz, unsigned char w)
{unsigned char Xd=0;P2=255;P2=mz;P3=w;while(++Xd);
}
void main()
{unsigned char jz=0,zhi=128;unsigned int Ys=47474;while(1){sm7447(jz,zhi);if(!++sy)++jz;if(jz>9){while(--Ys);jz=0;if(zhi==128)zhi/=2;else zhi=128;}}
}