51单片机开发板ds1302+lcd1602出现问号，不能正确计时，困扰很久了，求一下解... -

#include <REG52.H>
#include <INTRINS.H>
#define delay() \
{ \
_nop_(); \
}
sbit DS1302_CE = P3 ^ 5;
sbit DS1302_IO = P3 ^ 4;
sbit DS1302_SCLK = P3 ^ 6;
unsigned char T0RH = 0;
unsigned char T0RL = 0;
bit flag200ms = 0;
void configTimer0(unsigned int ms);
void init_DS1302();
extern void lcdShowStr(unsigned char x, unsigned char y, unsigned char *str);//在lcd1602的x列，y行输出str
extern void initLCD1602();//初始化lcd1602
unsigned char DS1302SingleRead(unsigned char reg);
void main()
{
unsigned char i;
unsigned char psec = 0xAA;
unsigned char time[8];
unsigned char str[12];
EA = 1;
configTimer0(1);
init_DS1302();
initLCD1602();
while (1)
{
if (flag200ms)
{
flag200ms = 0;
for (i = 0; i < 7; i++)
{
time[i] = DS1302SingleRead(i);
}
if (psec != time[0])
{
str[0] = '2';
str[1] = '0';
str[2] = (time[6] >> 4) + '0';
str[3] = (time[6] & 0x0F) + '0';
str[4] = '-';
str[5] = (time[4] >> 4) + '0';
str[6] = (time[4] & 0x0F) + '0';
str[7] = '-';
str[8] = (time[3] >> 4) + '0';
str[9] = (time[3] & 0x0F) + '0';
str[10] = '\0';
lcdShowStr(0, 0, str);
str[0] = (time[5] & 0x0F) + '0';
str[1] = '\0';
lcdShowStr(11, 0, "week");
lcdShowStr(15, 0, str);
str[0] = (time[2] >> 4) + '0';
str[1] = (time[2] & 0x0F) + '0';
str[2] = ':';
str[3] = (time[1] >> 4) + '0';
str[4] = (time[1] & 0x0F) + '0';
str[5] = ':';
str[6] = (time[0] >> 4) + '0';
str[7] = (time[0] & 0x0F) + '0';
str[8] = '\0';
lcdShowStr(4, 1, str);
psec = time[0];
}
}
}
}
void DS1302ByteWrite(unsigned char dat)
{
unsigned char mask;
for (mask = 0x01; mask != 0; mask <<= 1)
{
if (mask & dat)
{
DS1302_IO = 1;
delay();
}
else
{
DS1302_IO = 0;
delay();
}
DS1302_SCLK = 1;
delay();
DS1302_SCLK = 0;
delay();
}
DS1302_IO = 1;
}
unsigned char DS1302ByteRead()
{
unsigned char mask;
unsigned char dat = 0;
DS1302_IO = 1;
for (mask = 0x01; mask != 0; mask <<= 1)
{
if (DS1302_IO)
{
dat |= mask;
}
DS1302_SCLK = 1;
delay();
DS1302_SCLK = 0;
delay();
}
return dat;
}
void DS1302SingleWrite(unsigned char reg, unsigned char dat)
{
DS1302_CE = 1;
delay();
DS1302ByteWrite((reg << 1) | 0x80);
DS1302ByteWrite(dat);
DS1302_CE = 0;
delay();
}
unsigned char DS1302SingleRead(unsigned char reg)
{
unsigned char dat;
DS1302_CE = 1;
delay();
DS1302ByteWrite((reg << 1) | 0x81);
dat = DS1302ByteRead();
DS1302_CE = 0;
delay();
return dat;
}
void init_DS1302()
{
unsigned char i;
unsigned char code initTime[] = {
0x00, 0x30, 0x12, 0x08, 0x10, 0x02, 0x13};
DS1302_CE = 0;
delay();
DS1302_SCLK = 0;
delay();
i = DS1302SingleRead(0);
if (i & 0x80)
{
DS1302SingleWrite(7, 0x00);
for (i = 0; i < 7; i++)
{
DS1302SingleWrite(i, initTime[i]);
}
}
}
void configTimer0(unsigned int ms)
{
unsigned long tmp;
tmp = 11059200 / 12;
tmp = (tmp * ms) / 1000;
tmp = 65536 - tmp;
tmp += 0;
T0RH = (unsigned char)(tmp >> 8);
T0RL = (unsigned char)tmp;
TMOD &= 0xF0;
TMOD |= 0x01;
TH0 = T0RH;
TL0 = T0RL;
ET0 = 1;
TR0 = 1;
}
void interruptTimer0() interrupt 1
{
static unsigned char timer200ms = 0;
TH0 = T0RH;
TL0 = T0RL;
timer200ms++;
if (timer200ms >= 200)
{
timer200ms = 0;
flag200ms = 1;
}
}

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#include <REG52.H>
#define LCD1602_DB P0
sbit LCD1602_RS = P2 ^ 6;
sbit LCD1602_RW = P2 ^ 5;
sbit LCD1602_EN = P2 ^ 7;
/*等待液晶准备好*/
void lcdWaitReady()
{
unsigned char sta;
LCD1602_DB = 0xFF;
LCD1602_RS = 0;
LCD1602_RW = 1;
do
{
LCD1602_EN = 1;
sta = LCD1602_DB; // 读取状态字
LCD1602_EN = 0;
} while (sta & 0x80); // bit_7为1时表示液晶正忙，重复检测直到其等于1为止
}
/*向LCD1602液晶写入一字节命令，cmd为待写入命令值*/
void lcdWriteCmd(unsigned char cmd)
{
lcdWaitReady();
LCD1602_RS = 0;
LCD1602_RW = 0;
LCD1602_DB = cmd;
LCD1602_EN = 1;
LCD1602_EN = 0;
}
/*向LCD1602液晶写入一字节命令，dat为待写入命令*/
void lcdWriteDta(unsigned char dat)
{
lcdWaitReady();
LCD1602_RS = 1;
LCD1602_RW = 0;
LCD1602_DB = dat;
LCD1602_EN = 1;
LCD1602_EN = 0;
}
/*设置显示RAM起始地址，亦即光标位置，(x,y)为对应屏幕上的字符坐标*/
void lcdSetCursor(unsigned char x, unsigned char y)
{
unsigned char addr;
if (y == 0)
{ // 由输入的屏幕坐标计算显示RAM的地址
addr = 0x00 + x; // 第一行字符地址从0x00起始
}
else
{
addr = 0x40 + x; // 第二行字符地址从0x40起始
}
lcdWriteCmd(addr | 0x80); // 设置RAM地址
}
/*在液晶上显示字符串，(x,y)为对应屏幕上的起始坐标，str为字符串指针*/
void lcdShowStr(unsigned char x, unsigned char y, unsigned char *str)
{
lcdSetCursor(x, y); // 设置起始地址
while (*str != '\0')
{ // 连续写入字符串数据，直到检测到结束符
lcdWriteDta(*str++); // 先取str指向的数据，然后str自加1
}
}
/*区域清除，清除从(x,y)坐标起始的len个字符*/
void lcdAreaClear(unsigned char x, unsigned char y, unsigned char len)
{
lcdSetCursor(x, y);
while (len--)
{
lcdWriteDta(' ');
}
}
/*清屏指令*/
void lcdFullClear()
{
lcdWriteCmd(0x01);
}
/*初始化1602液晶*/
void initLCD1602()
{
lcdWriteCmd(0x38); // 16*2显示，5*7点阵，8位数据接口
lcdWriteCmd(0x0C); // 显示器开，光标关闭
lcdWriteCmd(0x06); // 文字不动，地址自动+1
lcdWriteCmd(0x01); // 清屏
}

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