新人头回发帖，求助大神，关于lcd1602乱码的问题

只看该作者 · 2014-4-28 17:32

程序如下：

#include <msp430g2553.h>
#define uchar unsigned char
#ifndef _CRY1602_H
#define _CRY1602_H
#define uchar unsigned char
#define uint unsigned int
void DispStr(uchar x,uchar y,uchar *ptr);
void LocateXY(uchar x,uchar y);
void Disp1Char(uchar x,uchar y,uchar data);
void LcdReset(void);
void LcdWriteCommand(uchar cmd,uchar chk);
void LcdWriteData(uchar data);
void WaitForEnable(void);
void Delay5ms(void);
#endif
uchar *s1 = "             AN HONG ";
uchar *s3 = "             are you out of mind";
#define datadir  P1DIR
#define dataport P1OUT
#define busy    0x80
#define ctrldir  P2DIR
#define CLR_RS P2OUT &= ~BIT0;    //RS = P2.0
#define SET_RS P2OUT |= BIT0;
#define CLR_RW P2OUT &= ~BIT1;    //RW = P2.1
#define SET_RW P2OUT |= BIT1;
#define CLR_EN P2OUT &= ~BIT2;    //EN = P2.2
#define SET_EN P2OUT |= BIT2;
void main(void)
{
WDTCTL = WDT_ADLY_250;       //间隔定时器，定时250ms
uchar *s2,*s4;
uchar j,k,l,j1,k1,l1;
uchar i = 0,i1=0;
s2 = s1;
      s4 = s3;
LcdReset();
while(*s1++ != '\0') i++;       //计算字符串有效字符个数
      while(*s3++ != '\0') i1++;
while(1)
{
for(j = 0;j < i;j++)
{
l = j;
for(k = 0;k<16;k++)
{
if(l < i)
Disp1Char(k,2,s2[l++]);
else
Disp1Char(k,2,' ');
}
IFG1 &= ~WDTIFG;          //清除中断失效标志
while(!(IFG1 & WDTIFG));
IFG1 &= ~WDTIFG;
}

for(j1 = 0;j1 < i1;j1++)
{
l1 = j1;
for(k1 = 0;k1<16;k1++)
{
if(l < i1)
Disp1Char(k1,1,s4[l1++]);
else
Disp1Char(k1,1,' ');
}
IFG1 &= ~WDTIFG;          //清除中断失效标志
while(!(IFG1 & WDTIFG));
IFG1 &= ~WDTIFG;
}

   }
}

void DispStr(uchar x,uchar y,uchar *ptr)
{
  uchar *temp;
  uchar i,n = 0;
  temp = ptr;
  while(*ptr++ != '\0') n++;       //计算字符串有效字符个数
  for(i = 0; i < n; i++)
  {
Disp1Char(x++,y,temp[i]);
if(x == 0x0f)
{
   x = 0;
   y ^= 1;
}
  }
}

void LocateXY(uchar x,uchar y)
{
  uchar temp;
  temp = x&0x0f;
  y &= 0x01;
  if(y) temp |= 0x40;//如果在第2行
  temp |= 0x80;
  LcdWriteCommand(temp,1);
}
void Disp1Char(uchar x,uchar y,uchar data)
{
  LocateXY(x,y);
  LcdWriteData(data);
}
void LcdReset(void)
{
  ctrldir |= 0x07;             //控制线端口设为输出状态
  datadir = 0xff;             //数据端口设为输出状态
  LcdWriteCommand(0x38,0);    //规定的复位操作
  Delay5ms();
  LcdWriteCommand(0x38,0);
  Delay5ms();
  LcdWriteCommand(0x38,0);
  Delay5ms();
  LcdWriteCommand(0x38,1);    //显示模式设置
  LcdWriteCommand(0x08,1);    //显示关闭
  LcdWriteCommand(0x01,1);    //显示清屏
  LcdWriteCommand(0x06,1);    //写字符时整体不移动
  LcdWriteCommand(0x0c,1);    //显示开，不开游标，不闪烁
}
void LcdWriteCommand(uchar cmd,uchar chk)
{
  if(chk) WaitForEnable();       //检测忙信号？
  CLR_RS;
  CLR_RW;
  _NOP();
  dataport = cmd;             //将命令字写入数据端口
  _NOP();
  SET_EN;                   //产生使能脉冲信号
  _NOP();
  _NOP();
  CLR_EN;
}
void LcdWriteData(uchar data)
{
  WaitForEnable();       //等待液晶不忙
  SET_RS;
  CLR_RW;
  _NOP();
  dataport = data;       //将四显示数据写入数据端口
  _NOP();
  SET_EN;                //产生使能脉冲信号
  _NOP();
  _NOP();
  CLR_EN;
}
void WaitForEnable(void)
{
  P1DIR &= 0X00;       //将P1口切换为输入状态
  CLR_RS;
  SET_RW;
  _NOP();
  SET_EN;
  _NOP();
  _NOP();
  while((P1IN & busy) != 0); //检测忙标志
  CLR_EN;
  P1DIR |= 0xff;    //将P1口切换为输出状态
}
void Delay5ms(void)
{
  uint i = 40000;
  while(i != 0)
  { i--;}
}
预期效果，上一行滚完“an。。。。”之后，下一行开始滚“are。。。”，如此往复。
可是在第二行滚完后紧接着跟出了一堆乱码，才开始继续循环，求大神解释