為么我的程序，LCD不顯示
#include"reg51.h"
#include"address.h"
#include"intrins.h"
#include"crc.h"
#define LCD1602_DB P0
sbit LCD1602_RS = P1^0;
sbit LCD1602_RW = P1^1;
sbit LCD1602_E = P1^5;
void InitLcd1602();
void LcdShowStr(unsigned char x, unsigned char y, unsigned char *str);
#define uint unsigned int
#define uchar unsigned char
uchar code sendbuf[]={0x01,0x03,0x02,0x00,0x00,0x03,0x04,0x73};
//0x01 從站地址，0x03功能碼，0x20寄存器地址高位，0x00寄存器地址低位，0x00數據個數高位，0x03數據個數低位，0x04CRC校驗碼高位，0x73CRC校驗碼低位
uchar code tab[]={'0','1','2','3','4','5','6','7','8','9'};
uchar code error[]={"error!"};
uchar tem[5],tem1[8];
uchar resvbuf[10];
int i,j;
uchar resvend,temp2;
uint crctemp,temp,temp1;
void convert10(uint dat)
{
uchar i;
tem1[0]='U';
tem1[1]='=';
tem1[7]='V';
tem[0]=dat/10000;
dat=dat%10000;
tem[1]=dat/1000;
dat=dat%1000;
tem[2]=dat/100;
dat=dat%100;
tem[3]=dat/10;
tem[4]=dat%10;
for (i=0;i<5;i++)
{
tem1[i+2]=tab[tem[i]];
}
}
void serial_int() interrupt 4 using 1
{
if(RI)
{
RI=0;
//temp2=SBUF;
resvbuf[j++]=SBUF;
if(j==7)
{
j=0;
resvend=1;
}
}
}
void initserial ()
{
resvend=0;
TMOD=0x20;
PCON=0x00;
SCON=0xd8;
TL1=0xfd;
TH1=0xfd;
TR1=1;
ES=1;
}
void displayout()
{
crctemp=crccheck(resvbuf,9);
temp=resvbuf[9];
temp=temp << 8 | resvbuf[10];
if(temp==crctemp)
{
temp1=0;
temp1 |=resvbuf[3];
temp1= temp1<<8 | resvbuf[4];
convert10(temp1);
LcdShowStr(0, 1, tem1);
//printf(tem1,8);
}
else
{
LcdShowStr(0, 1,error );
//printf(error,16);
}
}
void delay_10us(uchar n)
{
do
{
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
}while(--n);
}
void delay_ms(uint n)
{
do
{
delay_10us(131);
}while(--n);
}
/* 等待液晶準備好 */
void LcdWaitReady()
{
unsigned char sta;
LCD1602_DB = 0xFF;
LCD1602_RS = 0;
LCD1602_RW = 1;
do {
LCD1602_E = 1;
sta = LCD1602_DB; //讀取狀態字
LCD1602_E = 0;
} while (sta & 0x80); //bit7等于1表示液晶正忙，重復檢測直到其等于0為止
}
/* 向LCD1602液晶寫入一字節命令，cmd-待寫入命令值 */
void LcdWriteCmd(unsigned char cmd)
{
LcdWaitReady();
LCD1602_RS = 0;
LCD1602_RW = 0;
LCD1602_DB = cmd;
LCD1602_E = 1;
LCD1602_E = 0;
}
/* 向LCD1602液晶寫入一字節數據，dat-待寫入數據值 */
void LcdWriteDat(unsigned char dat)
{
LcdWaitReady();
LCD1602_RS = 1;
LCD1602_RW = 0;
LCD1602_DB = dat;
LCD1602_E = 1;
LCD1602_E = 0;
}
/* 設置顯示RAM起始地址，亦即光標位置，(x,y)-對應屏幕上的字符坐標 */
void LcdSetCursor(unsigned char x, unsigned char y)
{
unsigned char addr;
if (y == 0) //由輸入的屏幕坐標計算顯示RAM的地址
addr = 0x00 + x; //第一行字符地址從0x00起始
else
addr = 0x40 + x; //第二行字符地址從0x40起始
LcdWriteCmd(addr | 0x80); //設置RAM地址
}
/* 在液晶上顯示字符串，(x,y)-對應屏幕上的起始坐標，str-字符串指針 */
void LcdShowStr(unsigned char x, unsigned char y, unsigned char *str)
{
LcdSetCursor(x, y); //設置起始地址
while (*str != '\0') //連續寫入字符串數據，直到檢測到結束符
{
LcdWriteDat(*str++); //先取str指向的數據，然后str自加1
}
}
/* 初始化1602液晶 */
void InitLcd1602()
{
LcdWriteCmd(0x38); //16*2顯示，5*7點陣，8位數據接口
LcdWriteCmd(0x0C); //顯示器開，光標關閉
LcdWriteCmd(0x06); //文字不動，地址自動+1
LcdWriteCmd(0x01); //清屏
}
void main()
{
InitLcd1602();
initserial();
EA=1;
while(1)
{
i=0;
while(i<8)
{
SBUF=sendbuf[i];
while(!TI);
delay_10us(50);
TI=0;
i++;
}
delay_ms(1000);
if(resvend)
{
resvend=0;
displayout();
}
}
}
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