标题: 单片机驱动LCD1602一直白块这个怎么解决? [打印本页]
作者: 蒲小广 时间: 2022-10-26 13:30
标题: 单片机驱动LCD1602一直白块这个怎么解决?
单片机源程序如下:
#include<reg52.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit SPEAK=P1^7; //定义蜂鸣器输出端口
sbit Key0=P1^0; //定义独立按键
sbit Key1=P1^1;
sbit Key2=P1^2;
sbit Key3=P1^3;
sbit RS=P2^0; //定义控制引脚
sbit RW=P2^1;
sbit E=P2^2;
uchar beat,tl,th; //定义节拍和T0初值变量
uchar code TABLE[]={ //音符对应的定时器初值表
0xfb,0x04,0xfb,0x90,0xfc,0x09,0xfc,0x44,
0xfc,0xac,0xfd,0x09,0xfd,0x34,0xfd,0x82,
0xfd,0xc8,0xfe,0x06,0xfe,0x22,0xfe,0x56,
0xfe,0x85,0xfe,0x9a,0xfe,0xc1};
uchar code GRACE[]={ //《奇异恩典》音符码表
0x14,0x48,0x62,0x42,0x68,0x54,0x48,0x24,0x18,
0x14,0x48,0x62,0x42,0x68,0x54,0x8c,0x88,
0x64,0x86,0x62,0x82,0x62,0x48,0x14,0x26,0x42,0x42,0x22,0x18,
0x14,0x48,0x62,0x42,0x68,0x54,0x4c,0x48,0x00};
uchar code JOY[]={ //《欢乐颂》音符码表
0x64,0x64,0x74,0x84,0x84,0x74,0x64,0x54,0x44,0x44,0x54,0x64,0x66,0x52,0x58,
0x64,0x64,0x74,0x84,0x84,0x74,0x64,0x54,0x44,0x44,0x54,0x64,0x56,0x42,0x48,
0x54,0x54,0x64,0x44,0x54,0x62,0x72,0x64,0x44,0x54,0x62,0x72,0x64,0x54,0x44,0x54,0x18,
0x64,0x64,0x74,0x84,0x84,0x74,0x64,0x54,0x44,0x44,0x54,0x64,0x56,0x42,0x48,0x00};
uchar code HAPPY[]={ //《生日快乐》音符码表
0x82,0x01,0x81,0x94,0x84,0xB4,0xA4,0x04,
0x82,0x01,0x81,0x94,0x84,0xC4,0xB4,0x04,
0x82,0x01,0x81,0xF4,0xD4,0xB4,0xA4,0x94,
0xE2,0x01,0xE1,0xD4,0xB4,0xC4,0xB4,0x04,
0x82,0x01,0x81,0x94,0x84,0xB4,0xA4,0x04,
0x82,0x01,0x81,0x94,0x84,0xC4,0xB4,0x04,
0x82,0x01,0x81,0xF4,0xD4,0xB4,0xA4,0x94,
0xE2,0x01,0xE1,0xD4,0xB4,0xC4,0xB4,0x04,
0x00};
uchar code GRACE_Name[]="Amazing Grace ";
uchar code JOY_Name[]="Ode To Joy ";
uchar code HAPPY_Name[]="Happy Birthday ";
void Timer0_Initialize();
void Delay_1ms(uchar ms);
void Delay(uchar);
void Key_Scan(char *numz,uchar *kz);
uchar Busy_Check();
void LCD_Write_Command(uchar cmd);
void LCD_Initialize();
void Show_String(uchar x,uchar y,uchar *str);
void main()
{
uchar m,m1,k=0; //定义临时变量
char num=0;
char *numz;
uchar *kz;
uchar *p[3];
uchar *q[3];
numz=#
kz=&k;
p[0]=GRACE;p[1]=JOY;p[2]=HAPPY;
q[0]=GRACE_Name;q[1]=JOY_Name;q[2]=HAPPY_Name;
Timer0_Initialize();
LCD_Initialize();
while(Key1);
Delay_1ms(5);
while(Key1);
while(1)
{
while(*(p[num]+k)!=0) //判断取得的音符码是否为结束码
{
beat=*(p[num]+k)&0x0f; //取节拍码
m=_crol_(*(p[num]+k),4)&0x0f; //取音调码
if(m!=0) //判断取得的音调码是否为0
{ //不是，根据取得的音调码计算T0初值
m1=--m*2+1;
m=m*2;
tl=TL0=TABLE[m1];
th=TH0=TABLE[m];
TR0=1; //启动T0
}
else //取得的音符码为0，则停止T0
TR0=0;
Delay(beat);
k++;
Show_String(0,0,q[num]);
Show_String(0,1,q[num]+16);
Key_Scan(numz,kz);
}
num++;
if(num>2)
num=0;
k=0;
}
}
/************************** T0初始化函数 ****************************/
void Timer0_Initialize()
{
TMOD=0x01;
IE=0x82;
}
/************************* T0中断服务函数 ***************************/
void timer0() interrupt 1 using 1
{
TL0=tl;TH0=th; //重装定时初值
SPEAK=~SPEAK; //蜂鸣器控制端口电平取反
}
/************************ 四分之一拍延时函数 ************************/
void Delay_Beat()
{
uint i;
for(i=0;i<20000;i++);
}
/************************** 节拍延时函数 ****************************/
void Delay(uchar tt)
{
uchar i;
for(i=0;i<tt;i++)
Delay_Beat();
}
/***************************1ms延时函数 ****************************/
void Delay_1ms(uchar ms)
{
int i;
while(ms--)
for(i=125;i>0;i--);
}
/**************************按键扫描函数******************************/
void Key_Scan(char *numz,uchar *kz)
{
bit flag;
if(!Key0)
{
Delay_1ms(5);
if(!Key0)
{
(*numz)--;
if(*numz<0)
*numz=2;
*kz=0;
}
}
else if(!Key2)
{
Delay_1ms(5);
if(!Key2)
{
(*numz)++;
if(*numz>2)
*numz=0;
*kz=0;
}
}
else if(!Key3)
{
Delay_1ms(5);
if(!Key3)
{
TR0=0;
flag=1;
while(flag)
{
if(!Key1)
{
Delay_1ms(5);
if(!Key1)
{
flag=0;
TR0=1;
}
}
}
}
}
while((!Key0)||(!Key1)||(!Key2));
}
/*******************检查1602是否处于忙状态函数**********************/
uchar Busy_Check()
{
uchar LCD_Status;
RS=0;
RW=1;
E=1;
Delay_1ms(1); //为什么延时1ms呢？
LCD_Status=P0;
E=0;
return LCD_Status;
}
/************************向1602写入命令函数*************************/
void LCD_Write_Command(uchar cmd)
{
while((Busy_Check()&0x80)==0x80); //如果1602忙
RS=0;
RW=0;
E=0;
P0=cmd;
E=1;
Delay_1ms(1);
E=0;
}
/************************向1602写入数据函数*************************/
void LCD_Write_Data(uchar dat)
{
while((Busy_Check()&0x80)==0x80);
RS=1;
RW=0;
E=0;
P0=dat;
E=1;
Delay_1ms(1);
E=0;
}
/*************************初始化1602液晶函数************************/
void LCD_Initialize()
{
LCD_Write_Command(0x38); //设置1602液晶功能，8位数据接口，
//两行显示，5*10点阵字符
Delay_1ms(1);
LCD_Write_Command(0x01); //清屏
Delay_1ms(1);
LCD_Write_Command(0x06); //输入方式选择指令，数据读写后AC自动+1，
//输出显示保持不变
Delay_1ms(1);
LCD_Write_Command(0x0c); //开显示，关光标，关闪烁
Delay_1ms(1);
}
/****************在坐标点X、Y上写入一个字符串函数*******************/
void Show_String(uchar x,uchar y,uchar *str)
{
uchar i=0;
if(y==0)
LCD_Write_Command(0x80|x);
if(y==1)
LCD_Write_Command(0xc0|x);
for(i=0;i<16;i++)
{
LCD_Write_Data(*(str+i));
}
}
作者: 人中狼 时间: 2022-10-26 14:39
调节对比度，看是否真的显示两行方块，确定显示两行方块，就是初始化通过了，问题出在写入显示数据上
作者: mengsiu 时间: 2022-10-27 22:41
应该是对比度调得太大了。能显示两行方块，说明初始化正常。
作者: man1234567 时间: 2022-10-28 14:24
接线错误或时序不当为多 
作者: coody_sz 时间: 2022-10-28 15:24
检查电路没接错，检查驱动没错误。1602基本是最简单的LCD模块了！
作者: 1792237060 时间: 2022-10-28 15:31
有一个引脚接的是可调电阻，可以通过拧螺丝的方式，把这个电阻的值调小。就能完成对比度的调节了
作者: wufa1986 时间: 2022-10-28 15:35
说明完全没有操作成功，这东西上电就是这样
作者: 大漠孤烟001 时间: 2022-10-28 15:55
我其实很喜欢段码LCD，因为省电！以前了解很多单片机都不带段码LCD驱动，普通MCU就要加LCD驱动芯片，电流太大！2年前买了200片STC的带LCD驱动的样片S T C 8H4K64TLCD，我做了不少电压表、电流表、功率表、GPS时钟、BPC时钟等等，超级省电，很喜欢。
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