请教一下，为什么lcd12864打点的时候会出现别的点

ID:1098678 · 发表于 2023-12-15 17:20

这是lcd的一些函数
void delay(unsigned int xms)  //延时//
{
      unsigned char i,j;
      for(j = 0; j < xms; j++)
      {
            for(i = 0;i < 110;i++);
      }
}
bit LcdBusyCheck(){
      bit result;
      LCD12864_RS = 0;
      LCD12864_RW = 1;
      LCD12864_EN = 1;
   delay(1);
      result = (bit)(DATA_PORT&0x80);
      LCD12864_EN = 0;
      return result;
}

void WriteCmdToLCD(unsigned char cmd)
{
      while(LcdBusyCheck());
//       delay(10);
      LCD12864_RS = 0;
      LCD12864_RW = 0;
      LCD12864_EN = 1;
   delay(1);
      DATA_PORT = cmd;
//       delay(5);
      LCD12864_EN = 0;
//       delay(5);
//       LCD12864_EN = 1;

}

void WriteDatToLcd(unsigned char dat)
{
      while(LcdBusyCheck());
//       delay(10);
      LCD12864_RS = 1;
      LCD12864_RW = 0;
      LCD12864_EN = 1;
   delay(1);
      DATA_PORT = dat;
//       delay(5);
      LCD12864_EN = 0;
//       delay(5);
//       LCD12864_EN = 1;

}

void WriteStrToLcd(unsigned char *str)
{
      while(*str != '\0')
      {
         WriteDatToLcd(*str++);
         delay(5);
      }
}

unsigned char ReadLcd(void)
{
   unsigned char dat;
   //DATA_PORT=0xff;
   while(LcdBusyCheck());
   LCD12864_RS=1;
   LCD12864_RW=1;
   LCD12864_EN=0;
   LCD12864_EN=1;
   dat=DATA_PORT;
   LCD12864_EN=0;
   return dat;
}

void DrawDots(unsigned char i,unsigned char j)//打点函数 //x，y为128*64 点阵的坐标
{
   unsigned char row,xlabel,xlabel_bit,x,y;
   unsigned char Read_H=0,Read_L=0;
   x = i+6;
   y = 64-j-5;
   WriteCmdToLCD(0x34);    //扩充指令
   WriteCmdToLCD(0x36);    //绘图指令
   xlabel=x>>4;          //确定水平坐标地址
   xlabel_bit=x & 0x0F; // 细分水平坐标中的第几位
   if(y<32) row=y;
   else { row=y-32; xlabel+=8;    }
   WriteCmdToLCD(row+0x80);
   WriteCmdToLCD(xlabel+0x80);
   ReadLcd();
   Read_H=ReadLcd();
   Read_L=ReadLcd();
   WriteCmdToLCD(row+0x80);
   WriteCmdToLCD(xlabel+0x80); //水平坐标地址+基址=显示的水平地址
   if(xlabel_bit<8)
   {

   // Read_H &=(~(0x01<<(7-xlabel_bit))); //变暗
      Read_H |=(0x01<<(7-xlabel_bit)); //变亮
// Read_H = Read_H;
      WriteDatToLcd(Read_H);
      WriteDatToLcd(Read_L);
   }
   else
   {

   //Read_L &=(~(0x01<<(15-xlabel_bit))); //变暗
      Read_L |=(0x01<<(15-xlabel_bit)); //变亮
// Read_L=Read_L;
      WriteDatToLcd(Read_H);
      WriteDatToLcd(Read_L);
   }
//    WriteDatToLcd(Read_H);
//    WriteDatToLcd(Read_L);
   WriteCmdToLCD(0x30);//恢复正常模式
}

void Clear_GDRAM() //清除GDRAM
{
unsigned char x,y;
for(y=0;y<64;y++)
{
for(x=0;x<16;x++)
{
WriteCmdToLCD(0x34);
WriteCmdToLCD(y+0x80); //先送垂直地址
WriteCmdToLCD(x+0x80); //后送水平地址
WriteCmdToLCD(0x30); //基本指令
WriteDatToLcd(0x00); //写入数据0
WriteDatToLcd(0x00);
}
}
}
这是主函数里面的循环打点
   for(i=5;i<50;i++)
         {

        DrawDots(i,i);
delay(100);
        }

ID:390438 · 发表于 2023-12-16 08:21

可能延时不够，或者打点过程中被中断打断了

ID:1098678 · 发表于 2023-12-18 16:59

检查了一下发现是读取数据函数的问题unsigned char ReadLcd()
{
   unsigned char dat = 0;
   while(LcdBusyCheck());
   DATA_PORT=0xff;
   LCD12864_EN=0;
   LCD12864_RS=1;
   LCD12864_RW=1;
   delay(1);
   LCD12864_EN=1;
   delay(1);
   dat=DATA_PORT;
   delay(1);
   LCD12864_EN=0;
   return dat;
}
但是不知道怎么纠正

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