奇怪了真奇怪了关于74hc595驱动LED的问题 -

#include <reg51.h>
#include <intrins.h>
sbit Ds=P1^0;
sbit Sh=P1^1;
sbit St=P1^2;
void DelayMS(unsigned int z)
{
unsigned char x;
while(z--)
for(x=120;x>0;x--);
}
void In_Data(unsigned char a,b,c)
{
unsigned char i,j,u;
for(u=0;u<6;u++)
{
if(u==0){j=a;}
if(u==1){j=b;}
if(u==2){j=c;}
if(u==3){j=a;}
if(u==4){j=b;}
if(u==5){j=c;}
for(i=0;i<8;i++)
{
j<<=1;
_nop_();_nop_();
Ds=CY;
_nop_();_nop_();
Sh=0;
_nop_();_nop_();
Sh=1;
}
}
St=0;
_nop_();_nop_();
St=1;
}
void main()
{
unsigned char i;
while(1)
{
if(i==0) {In_Data(0x7F,0xFF,0xFF);}//01111111 11111111 11111111
if(i==1 || i==45) {In_Data(0xBF,0xFF,0xFF);}//10111111 11111111 11111111
if(i==2 || i==44) {In_Data(0xDF,0xFF,0xFF);}//11011111 11111111 11111111
if(i==3 || i==43) {In_Data(0xEF,0xFF,0xFF);}//11101111 11111111 11111111
if(i==4 || i==42) {In_Data(0xF7,0xFF,0xFF);}//11110111 11111111 11111111
if(i==5 || i==41) {In_Data(0xFB,0xFF,0xFF);}//11111011 11111111 11111111
if(i==6 || i==40) {In_Data(0xFD,0xFF,0xFF);}//11111101 11111111 11111111
if(i==7 || i==39) {In_Data(0xFE,0xFF,0xFF);}//11111110 11111111 11111111
if(i==8 || i==38) {In_Data(0xFF,0x7F,0xFF);}//11111111 01111111 11111111
if(i==9 || i==37) {In_Data(0xFF,0xBF,0xFF);}//11111111 10111111 11111111
if(i==10 || i==36){In_Data(0xFF,0xDF,0xFF);}//11111111 11011111 11111111
if(i==11 || i==35){In_Data(0xFF,0xEF,0xFF);}//11111111 11101111 11111111
if(i==12 || i==34){In_Data(0xFF,0xF7,0xFF);}//11111111 11110111 11111111
if(i==13 || i==33){In_Data(0xFF,0xFB,0xFF);}//11111111 11111011 11111111
if(i==14 || i==32){In_Data(0xFF,0xFD,0xFF);}//11111111 11111101 11111111
if(i==15 || i==31){In_Data(0xFF,0xFE,0xFF);}//11111111 11111110 11111111
if(i==16 || i==30){In_Data(0xFF,0xFF,0x7F);}//11111111 11111111 01111111
if(i==17 || i==29){In_Data(0xFF,0xFF,0xBF);}//11111111 11111111 10111111
if(i==18 || i==28){In_Data(0xFF,0xFF,0xDF);}//11111111 11111111 11011111
if(i==19 || i==27){In_Data(0xFF,0xFF,0xEF);}//11111111 11111111 11101111
if(i==20 || i==26){In_Data(0xFF,0xFF,0xF7);}//11111111 11111111 11110111
if(i==21 || i==25){In_Data(0xFF,0xFF,0xFB);}//11111111 11111111 11111011
if(i==22 || i==24){In_Data(0xFF,0xFF,0xFD);}//11111111 11111111 11111101
if(i==23) {In_Data(0xFF,0xFF,0xFE);}//11111111 11111111 11111110
DelayMS(1200);
i++;
if(i==46){i=0;}
}
}

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