lcd1602在单片机开发板上是正常的用proteus仿真只显示黑色方块呢？ -

#include<reg52.h>
#include<intrins.h>
#define LCD1602_DB P0
sbit LCD1602_RS = P2^0;
sbit LCD1602_RW = P2^1;
sbit LCD1602_E = P2^2;
bit flag500ms = 0; //500毫秒标志
unsigned char T0RH = 0;
unsigned char T0RL = 0;
unsigned char code str1[] = "DA JIA HAO.";
unsigned char code str2[] = "Let's move...";
void LcdShowStr(unsigned char x, unsigned char y, unsigned char *str, unsigned char len);
void configT0(unsigned int ms);
void InitLcd1602();
void main()
{
unsigned char i;
unsigned char index = 0;
unsigned char pdata bufMove1[16 + sizeof(str1) + 16]; //字符缓冲区
unsigned char pdata bufMove2[16 + sizeof(str2) + 16];
EA = 1;
InitLcd1602();
configT0(2);
for(i = 0; i < 16; i++) //字符缓冲区前15字符赋初值
{
bufMove1[i] = ' ';
bufMove2[i] = ' ';
}
for(i = 0; i < (sizeof(str1) - 1); i++) //字符缓冲区中间15字符赋初值
{
bufMove1[16+i] = str1[i];
bufMove2[16+i] = str2[i];
}
for(i = (16 + sizeof(str1) - 1); i < sizeof(bufMove1); i++) //字符缓冲区后15字符赋初值
{
bufMove1[i] = ' ';
bufMove2[i] = ' ';
}
while(1)
{
if(flag500ms) //到达500毫秒刷新一次
{
flag500ms = 0;
LcdShowStr(0, 0, bufMove1 + index, 16);
LcdShowStr(0, 1, bufMove2 + index, 16);
index++;
if(index >= (16 + sizeof(str1) - 1))
{
index = 0;
}
}
}
}
void configT0(unsigned int ms)
{
unsigned long int tmp;
tmp = 12000000 / 12;
tmp = (tmp * ms) / 1000;
tmp = 65536 - tmp + 12;
T0RH = (unsigned char)(tmp >> 8);
T0RL = (unsigned char)tmp;
TMOD &= 0XF0;
TMOD |= 0X01;
TH0 = T0RH;
TL0 = T0RL;
ET0 = 1;
TR0 = 1;
}
void LcdWaiReady() //读指令
{
unsigned char sta;
LCD1602_E = 0;
LCD1602_DB = 0XFF;
LCD1602_RS = 0;
LCD1602_RW = 1;
do
{
LCD1602_E = 1;
sta = LCD1602_DB;
LCD1602_E = 0;
}
while(sta & 0x80);
}
void LcdWriteCMD(unsigned char cmd) //写指令
{
LcdWaiReady();
LCD1602_E = 0;
LCD1602_RS = 0;
LCD1602_RW = 0;
LCD1602_DB = cmd;
LCD1602_E = 1;
LCD1602_E = 0;
}
void LcdWriteDat(unsigned char dat) //写数据
{
LcdWaiReady();
LCD1602_E = 0;
LCD1602_RS = 1;
LCD1602_RW = 0;
LCD1602_DB = dat;
LCD1602_E = 1;
LCD1602_E = 0;
}
void LcdSetCursor(unsigned char x, unsigned char y)
{
unsigned char addr;
if(y == 0)
{
addr = 0x00 + x;
}
else
{
addr = 0x40 + x;
}
LcdWriteCMD(addr | 0x80);
}
void LcdShowStr(unsigned char x, unsigned char y, unsigned char *str, unsigned char len)
{
LcdSetCursor(x, y);
while(len--)
{
LcdWriteDat(*str++);
}
}
void InitLcd1602()
{
LcdWriteCMD(0x38);
LcdWriteCMD(0x0C);
LcdWriteCMD(0x06);
LcdWriteCMD(0x01);
}
void interrupt_T0() interrupt 1
{
static unsigned char time500ms = 0;
TH0 = T0RH;
TL0 = T0RL;
time500ms++;
if(time500ms >= 250)
{
time500ms = 0;
flag500ms = 1;
}
}

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