这条lcd1602的C程序怎么总是有错误的？
#include<at89x52.h>
#include<absacc.h>
#define LCDCOM XBYTE[0x2000]
#define LCDDATAW XBYTE[0xa000]
sbit LCDEN=P2^5;
/*---驱动部分函数说明----*/
void delayl();
void delays();
void WriteCommand(unsigned char c); //命令子函数说明
void WriteData(unsigned char c); //数据子函数说明
void ShowChar(unsigned char pos,unsigned char c);//显示字符子函数说明
void ShowString(unsigned char line,char *ptr);
void InitLcd();
/*--主函数--*/
void main(void)
{
char code str1[]="u=218v=290k";
char code str2[]="new year!";
unsigned char i,j;
SP=0x50;
delayl();
InitLcd();
ShowString(0,str1);
ShowString(1,str2);
delayl();
delayl();
delayl();
delayl();
for(i=0;i<17;i++)
{
ShowString(0,str1+i);
ShowString(1,str2+i);
for(j=0;j<120;j++)
delays();
}
}
/*----LCD驱动部分-----*/
void delayl()
{
unsigned char i,j;
i=0xa0;
j=0xff;
while(i--)
while(j--);
}
void delays()
{
unsigned char i;
i=0x1f;
while(i--);
}
void writecommand(unsigned char c)//写命令，将字C写入LCD
{
delays();
LCDEN=0;
LCDCOM=c;
}
void writedate(unsigned char c)//写数据，使显示字符
{
delays();
LCDEN=0;
LCDDATAW=c;
}
void showchar(unsigned char pos,unsigned char c)
{
unsigned char p;
if(pos<0x10) p=pos+0x80;
else p=pos+0xb0;
writecommand (p);
writedate(c);
}
void ShowString(unsigned char line,char *ptr)
{
unsigned char l,i;
l=line*0x10;
for(i=0;i<16;i++)
/*ShowChar(l++;*(ptr+i))*/; 错误点 就还有这个错误了 错误显示内容：（ AA.C(72): warning C280: 'ptr': unreferenced local variable）
}
void initlcd()
{
delayl();
writecommand(0x38);
writecommand(0x38);
writecommand(0x06);
writecommand(0x0c);
writecommand(0x01);
writecommand(0x80);
}
3\4楼的回答都正确了，可是还是不能显示。原因是没有检测忙信号。还有编程也有点错误，这是一条书上的编程，但是书是错误的。应该作以下改正才能显示：
bit lcd_bz() //测试LCD忙碌状态
{
bit result;
rs = 0;
rw = 1;
LCDEN = 1;
delays();
delays();
result = (bit)(P0 & 0x80);
LCDEN = 0;
return result;
}
/*----LCD驱动部分-----*/
void delayl()
{
unsigned char i,j;
i=0xa0;
j=0xff;
while(i--)
while(j--);
}
void delays()
{
unsigned char i;
i=0x1f;
while(i--);
}
void writecommand(unsigned char c)//写命令，将字C写入LCD
{
while(lcd_bz());
rs=0;
rw=0;
LCDEN=0;
P0=c;
delays();
LCDEN=1;
delays();
LCDEN=0;
}
void writedate(unsigned char c)//写数据，使显示字符
{
while(lcd_bz());
rs=1;
rw=0;
LCDEN=0;
P0=c;
LCDEN=1;
delays();
LCDEN=0;
}
最新回答
花朵之蓝
2024-11-05 16:29:29
{
unsigned char l,i;
l=line*0x10;
for(i=0;i<16;i++)
showchar(l++,*(ptr+i));
}
/*******ptr类型声明有问题吧，还有showchar两个参数之间要用逗号，要全小写,跟上面的保持一致，指针变量ptr要明确声明unsigned char *ptr，还有，如果你的字符串不够16个这样就不太好吧，改一下吧：*****/
void ShowString(unsigned char line,unsigned char *ptr)
{
unsigned char l,i;
l=line*0x10;
while(*ptr)
{showchar(l,*ptr); l++;ptr++;}
}
干净好听的昵称
2024-11-05 14:07:53
#define uchar unsigned char
#define uint unsigned int
uchar code table[]="I LIKE MCU!";
uchar code table1[]="
www.TXMCU.COM
";sbit lcden=P3^4;
sbit lcdrs=P3^5;
sbit dula=P2^6;
sbit wela=P2^7;
uchar num;
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void write_com(uchar com)
{
lcdrs=0;
P0=com;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void write_data(uchar date)
{
lcdrs=1;
P0=date;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void init()
{
dula=0;
wela=0;
lcden=0;
write_com(0x38);
write_com(0x0e);
write_com(0x06);
write_com(0x01);
write_com(0x80+0x10);
}
void main()
{
init();
for(num=0;num<11;num++)
{
write_data(table[num]);
delay(20);
}
// write_com(1);
write_com(0x80+0x53);
for(num=0;num<13;num++)
{
write_data(table1[num]);
delay(20);
}
for(num=0;num<16;num++)
{
write_com(0x18);
delay(20);
}
while(1);
}
这是郭天翔教程上的例程自己看下，用的也是1602，不知有用没。
清欢.
2024-11-05 18:30:49
解桑陌
2024-11-05 07:33:57
改
ShowChar(l++,*(ptr+i))
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