我记得 很久前  在 google 上找到一个现成的  再次google  未验证
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#include<reg52.h>
#define uchar unsigned char
#define uint  unsigned int

sbit TM_dio=P2^1;
sbit TM_stb=P2^2;
sbit TM_clk=P2^3;

uchar data TAB_keynum[5];//这5个数据来保存键值
#define knum1 TAB_keynum[0]
#define knum2 TAB_keynum[1]
#define knum3 TAB_keynum[2]
#define knum4 TAB_keynum[3]
#define knum5 TAB_keynum[4]

//共阴的数码管表格0-f
uchar code TAB_duan[]={0x3f,0x6,0x5b,0x4f,0x66,0x6d,0x7d,0x7,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

void delay_ms(uint x)//廷时1ms*x
{
uint a,b;
for(b=x;b>0;b--)
for(a=125;a>0;a--);
}

void delayus(){}//延时4us


void WR_TM1628_Byte(uchar TM_dat)
{
uchar i;
for(i=0;i<8;i++)
{
TM_dio=(bit)(TM_dat&0x01);//强制转成:位，低位先发送
TM_clk=0;//---------|
TM_dat>>=1;//-------|
TM_clk=1;//---------|___|----/上升沿有效
}
}
uchar Read_TM_Byte()
{
uchar i,k;
for(i=0;i<8;i++)
{
TM_clk=0;
k>>=1;
TM_clk=1;
if(TM_dio==1){k|=0x80;}//1000 0000
//        else k&=0x7f;       
}
return (k);
}

void Wr_TM_CMD(uchar TMcmd)
{
TM_stb=0;//片选，0有效
WR_TM1628_Byte(TMcmd);
TM_stb=1;//片选，0有效
TM_dio=1;
}

void Read_keynumber()//读TM1628的key值并入5个数组里面
{
uchar i;
TM_stb=0;//片选，0有效

WR_TM1628_Byte(0x42);//读键值命令0x42
TM_dio=1;//****************这一句很关键/在读数据时，一定要释放DIO=1
delayus();//必要的delay
for(i=0;i<5;i++)
{
TAB_keynum=Read_TM_Byte();//读key值
}

TM_stb=1;//片选，0有效
}

void TM1628_display(uchar dat1,uchar dat2,uchar dat3,uchar dat4,uchar dat5,uchar dat6,uchar dat7)
{
Wr_TM_CMD(0x03);//显示模式
Wr_TM_CMD(0x40);//地址自动加一

TM_stb=0;//片选，0有效

WR_TM1628_Byte(0xc0);//地址0开始
WR_TM1628_Byte(dat1);
WR_TM1628_Byte(0xff);
WR_TM1628_Byte(dat2);
WR_TM1628_Byte(0xff);
WR_TM1628_Byte(dat3);
WR_TM1628_Byte(0xff);
WR_TM1628_Byte(dat4);
WR_TM1628_Byte(0xff);
WR_TM1628_Byte(dat5);
WR_TM1628_Byte(0xff);
WR_TM1628_Byte(dat6);
WR_TM1628_Byte(0xff);
WR_TM1628_Byte(dat7);
WR_TM1628_Byte(0xff);

TM_stb=1;//片选，0有效

Wr_TM_CMD(0x8f);//送亮度指令
}

void TM1628_init()
{
TM_dio=1;
TM_stb=1;
TM_clk=1;
}

void main()
{

delay_ms(300);
TM1628_init();
//乱写二个数玩玩
TM1628_display(TAB_duan[8],TAB_duan[2],TAB_duan[3],TAB_duan[4],TAB_duan[8],0xff,0xff);
delay_ms(3000);
while(1)
{

Read_keynumber();//读键值
delay_ms(100);
//显示键值
TM1628_display(TAB_duan[knum1],TAB_duan[knum2],TAB_duan[knum3],TAB_duan[knum4],TAB_duan[knum5],0xff,0xff);
delay_ms(100);
}