单片机开发板LCD1602显示屏只亮不显示 -

标题: 单片机开发板LCD1602显示屏只亮不显示 [打印本页]

作者: cghjgfcb 时间: 2023-2-13 23:53
标题: 单片机开发板LCD1602显示屏只亮不显示
在proteus仿真程序运行LCD1602有显示，但在普中开发板上显示屏只亮，不显示，是哪里出了问题

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作者: cghjgfcb 时间: 2023-2-14 09:29
这是程序代码，求指点

void Lcd1602_Delay1ms(uint c) //?? 0us
{
uchar a,b;
      for (; c>0; c--)
      {
               for (b=199;b>0;b--)
               {
                        for(a=1;a>0;a--);
               }
      }

}

#ifndef       LCD1602_4PINS       //???????LCD1602_4PINS?
void LCD_WriteCmd(uchar com)       //????
{
      LCD1602_E = 0;    //??
      LCD1602_RS = 0;          //??????
      LCD1602_RW = 0;          //????

      LCD1602_DATAPINS = com;    //????
      Lcd1602_Delay1ms(1);             //??????

      LCD1602_E = 1;                //????
      Lcd1602_Delay1ms(5);       //????
      LCD1602_E = 0;
}
#else
void LCD_WriteCmd(uchar com)       //????
{
      LCD1602_E = 0;       //????
      LCD1602_RS = 0;       //??????
      LCD1602_RW = 0;       //????

      LCD1602_DATAPINS = com;       //??4???????P0?????,??????????
      Lcd1602_Delay1ms(2);

      LCD1602_E = 1;       //????
      Lcd1602_Delay1ms(5);
      LCD1602_E = 0;

//       Lcd1602_Delay1ms(1);
      LCD1602_DATAPINS = com << 4; //?????
      Lcd1602_Delay1ms(1);

      LCD1602_E = 1;       //????
      Lcd1602_Delay1ms(5);
      LCD1602_E = 0;
}
#endif
/*******************************************************************************
* ? ? ?       : LcdWriteData
* ????                : ?LCD?????????
* ? ?       : dat
* ? ?       : ?
*******************************************************************************/
#ifndef       LCD1602_4PINS
void LCD_WriteData(uchar dat)                      //????
{
      LCD1602_E = 0;       //????
      LCD1602_RS = 1;       //??????
      LCD1602_RW = 0;       //????

      LCD1602_DATAPINS = dat; //????
      Lcd1602_Delay1ms(1);

      LCD1602_E = 1; //????
      Lcd1602_Delay1ms(5); //????
      LCD1602_E = 0;
}
#else
void LCD_WriteData(uchar dat)                      //????
{
      LCD1602_E = 0;       //????
      LCD1602_RS = 1;       //??????
      LCD1602_RW = 0;       //????

      LCD1602_DATAPINS = dat;       //??4???????P0?????,??????????
      Lcd1602_Delay1ms(1);

      LCD1602_E = 1;       //????
      Lcd1602_Delay1ms(5);
      LCD1602_E = 0;

      LCD1602_DATAPINS = dat << 4; //?????
      Lcd1602_Delay1ms(1);

      LCD1602_E = 1;       //????
      Lcd1602_Delay1ms(5);
      LCD1602_E = 0;
}
#endif
/*******************************************************************************
* ? ? ?    : LcdInit()
* ????                : ???LCD?
* ? ?    : ?
* ? ?    : ?
*******************************************************************************/
#ifndef             LCD1602_4PINS
void LcdInit()                                                 //LCD??????
{
      LCD_WriteCmd(0x38);  //???
      LCD_WriteCmd(0x0c);  //????????
      LCD_WriteCmd(0x06);  //??????1
      LCD_WriteCmd(0x01);  //??
      LCD_WriteCmd(0x80);  //????????
}
#else
void LCD_Init()                                                 //LCD??????
{
      LCD_WriteCmd(0x32);       //?8?????4???
      LCD_WriteCmd(0x28);       //?????????
      LCD_WriteCmd(0x0c);  //????????
      LCD_WriteCmd(0x06);  //??????1
      LCD_WriteCmd(0x01);  //??
      LCD_WriteCmd(0x80);  //????????
}
#endif

void LCD_Clear()
{
      LCD_WriteCmd(0x01);
      LCD_WriteCmd(0x80);
}

//??????????

void LCD_Dispstring(u8 x,u8 line,u8 *p)
{
      char i=0;
      if(line<1)          //?????
      {
            while(*p!='\0')
            {
                     if(i<16-x)
                     {
                              LCD_WriteCmd(0x80+i+x);
                     }
                     else
                     {
                              LCD_WriteCmd(0x40+0x80+i+x-16);
                     }
                     LCD_WriteData(*p);
                     p++;
                     i++;
            }
      }
      else                //?2???
      {
            while(*p!='\0')
            {
                     if(i<16-x)
                     {
                              LCD_WriteCmd(0x80+0x40+i+x);
                     }
                     else
                     {
                              LCD_WriteCmd(0x80+i+x-16);
                     }
                     LCD_WriteData(*p);
                     p++;
                     i++;
            }
      }
}
??????:

#include "public.h"
#include "lcd.h"
#include "temp.h"
#include "i2c.h"

sbit k3=P3^1;       //???????
sbit k1=P3^0;       //?
sbit k2=P3^2;       //?

sbit led=P2^0; //?????

sbit beep=P1^5;       //?????
sbit relay=P1^4;  //????
sbit moto=P1^0; //????

char set_templ=25,set_temph=32;  //??????????
u16 temp_val;  //???????
u8 mode;  //????

void Temp_DataPros()
{
      short temp;
      u8 temp_buf[5];
      temp=Ds18b20ReadTemp();
      temp_val=temp;
      if(temp<0)
      {
            temp=-temp;
            LCD_Dispstring(2+5,0,"-");
      }
      else
      {
            LCD_Dispstring(2+5,0," ");
      }

      temp_buf[0]=temp/100+0x30;
      temp_buf[1]=temp%100/10+0x30;
      temp_buf[2]='.';
      temp_buf[3]=temp%100%10+0x30;
      temp_buf[4]='\0';
      LCD_Dispstring(2+6,0,temp_buf);                //???????xx.x

      temp_buf[0]=set_temph/10+0x30;
         temp_buf[1]=set_temph%10+0x30;
      temp_buf[2]='\0';
      LCD_Dispstring(5,1,temp_buf);       //??????????xx

      temp_buf[0]=set_templ/10+0x30;
         temp_buf[1]=set_templ%10+0x30;
      temp_buf[2]='\0';
      LCD_Dispstring(14,1,temp_buf);       //??????????xx
}

#define  K1_MODE  1
#define  K2_ADD  2
#define  K3_DEC  3

//mode:  0-???? 1-????
u8 KEY_Scan(u8 mode)
{
      static u8 key=1;
      if(key&&(k1==0||k2==0||k3==0))
      {
            delay(300); //??
            key=0;
            if(k3==0)
            {
                     return K1_MODE;
            }
            else if(k1==0)
            {
                     return K2_ADD;
            }
            else if(k2==0)
            {
                     return K3_DEC;
            }
      }
      else if(k1==1&&k2==1&&k3==1)
      {
            key=1;
      }
      if(mode)
      {
            key=1;
      }
      return 0;
}

void KEY_Pros()
{
      u8 key;
      u8 temph_buf[3];

      key=KEY_Scan(0);

      if(key==K1_MODE) //????
      {
            mode++;
            LCD_Clear();

            if(mode==1)
            {
                     LCD_Dispstring(0,0,"SETH: C");
            }
            else if(mode==2)
            {
                     LCD_Dispstring(0,1,"SETL: C");
            }
            else
            {
                     mode=0;
                     LCD_Dispstring(2,0,"Temp:    C");
                     LCD_Dispstring(0,1,"SETH:  ");
                     LCD_Dispstring(9,1,"SETL:  ");
            }
      }
      if(mode==1)       //??????
      {
            switch(key)
            {
                     case K2_ADD:          //?
                                             set_temph++;
                                             if(set_temph>=80)set_temph=80;
                                             break;
                     case K3_DEC:       //?
                                             set_temph--;
                                             if(set_temph<=0)set_temph=0;
                                             break;
            }

            temph_buf[0]=set_temph/10+0x30;
            temph_buf[1]=set_temph%10+0x30;
            temph_buf[2]='\0';
               LCD_Dispstring(6,0,temph_buf);
            At24c02Write(0,set_temph);
      }

      else if(mode==2)  //??????
      {
            switch(key)
            {
                     case K2_ADD:          //?
                                             set_templ++;
                                             if(set_templ>=80)set_templ=80;
                                             break;
                     case K3_DEC:       //?
                                             set_templ--;
                                             if(set_templ<=0)set_templ=0;
                                             break;
            }

            temph_buf[0]=set_templ/10+0x30;
            temph_buf[1]=set_templ%10+0x30;
            temph_buf[2]='\0';
               LCD_Dispstring(6,1,temph_buf);
            At24c02Write(2,set_templ);
      }


}

void sound()
{
      u8 i=50;
      while(i--)
      {
            beep=!beep;
            delay(10);
      }
}
void TempData_Compare()
{
      if(temp_val>set_temph*10)       //????????? ??  ??
      {
            led=0;
            moto=1;
            relay=1;
            sound();
      }
      else if(temp_val<set_templ*10)       //????????? ??  ??
      {
            led=1;
            moto=0;
            relay=0;
            sound();
      }
      else                   //?????????????? ????  ????  ????
      {
            moto=0;
            led=1;
            relay=1;
      }
}

void kai_display()
{
      if(At24c02Read(255)!=18)
      {
            At24c02Write(0,set_temph);
            At24c02Write(2,set_templ);
            At24c02Write(255,18);
      }
      else
      {
            set_temph=At24c02Read(0);
            set_templ=At24c02Read(2);
      }

      LCD_Dispstring(2,0,"Temp:    C");
      LCD_Dispstring(0,1,"SETH:  ");
      LCD_Dispstring(9,1,"SETL:  ");
}

void main()
{
      moto=0;
      led=1;
      relay=1;

      LCD_Init();
      kai_display();
      while(1)
      {
            if(mode==0)
                     Temp_DataPros();
            KEY_Pros();
            TempData_Compare();
      }
}

作者: xuyaqi 时间: 2023-2-14 16:22
调对比度电位器

作者: lkc8210 时间: 2023-2-14 16:22
有没有可能插反了？

作者: angmall 时间: 2023-2-14 17:56
普中开发板有些 LCD 是用4位的。

作者: 人中狼 时间: 2023-2-14 21:16
只有一排方块，初始化不成功

作者: mengsiu 时间: 2023-2-15 10:51
这个时候（单排方块）通常要考虑接线是否正确。

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