📄 main.c

📁 这是一个arm7液晶屏的驱动程序
💻 C
📖 第 1 页 / 共 2 页
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上一页 12
void ST7920SetGdramLocation(uchar x, uchar y)
{
  /* 设定gdram位置时，应当先设定垂直位置在设定水平位置 */
  ST7920WriteByte(MSG_TYPE_COMM, ST7920_GDRAM_BASE+y);  //  垂直坐标设定
  ST7920WriteByte(MSG_TYPE_COMM, ST7920_GDRAM_BASE+x);  //  水平坐标设定
}


void ST7920WriteString( uchar* string)
{
  ST7920WriteByte(MSG_TYPE_COMM, ST7920_COMMAND_TYPE_BASIC);

  while(*string)
  {
    ST7920WriteByte(MSG_TYPE_DATA,*string);
    string++;
  }
}

void ST7920WriteChinese(uint msg)
{
  ST7920WriteByte(MSG_TYPE_COMM, ST7920_COMMAND_TYPE_BASIC);

  ST7920WriteByte(MSG_TYPE_DATA,((0xFF00&msg)>>8));
  ST7920WriteByte(MSG_TYPE_DATA,((0xFF&msg)));
}


void ST7920LcmClear()
{
    ST7920WriteByte(MSG_TYPE_COMM, ST7920_COMMAND_TYPE_BASIC);
    ST7920WriteByte(MSG_TYPE_COMM, ST7920_COMMAND_BASIC_CLEAR);
}

/*
  函数说明:打点
  参数说明: unsigned int x  ： (自定义坐标系)像素坐标点的x坐标 ;范围为0~127
            unsigned int y  ： (自定义坐标系)像素坐标点的y坐标 ;范围为0~63
  备注说明: 1. 自定义坐标系设置：设置液晶屏左下角为原点，向左为x正坐标线，向上为y正坐标线；
               由于st7920内部使用的坐标系为：左上角为原点，向左为x正坐标线，向下为y正坐标线；
               因此存在一个坐标转化的问题；具体参见函数体相应坐标转化部分。
            2. 自定义坐标系与st7920内部使用坐标系的另一区别：前者以像素为基本操作单位，而
               后者以位元组（一位元组 = 8个像素）为基本操作单位。

*/
void ST7920DrawDot(uchar x, uchar y)
{
  unsigned char cx,cy;

  ST7920WriteByte(MSG_TYPE_COMM, ST7920_COMMAND_TYPE_EXTEND);
  ST7920WriteByte(MSG_TYPE_COMM, ST7920_COMMAND_EXTEND_GRAPHIC_ON);

  /* 转化坐标点到st7920坐标系对应坐标点 */
  cx = x/16;     //  计算像素坐标在st7920坐标系下的位元组x坐标
  cy = 63-y;     //  y

  if(cy >= 32)
  {
    cx = cx + 8;
    cy -= 32;
  }

  ST7920SetGdramLocation(cx,cy);
  ST7920WriteWord((0x8000>>(x%16)));
}

/*
  函数说明：显示图片
  参数说明：unsigned char* pic -- 图片十六进制文件信息
  备    注：1.st7920处于图形模式、扩展指令集下
            2.st7920驱动的12864液晶屏在图形模式下使用gdram显示图形信息，
            3.gdram以左上角为原点，向左向下递增，向左为水平坐标(x)，向下为垂直坐标(y)
            4.gdram提供32*64个位元组(一行32个位元组，共64行)(一个位元组8位，可控制8个像素点),
              因此gdram可控制(32*8=)256 * 64个像素点；
              以位元组为基本控制单位，通过置1或0来达到显示或不显示该像素点。
*/

void ST7920DrawPic(uchar *pic)
{
  uchar x,y ;
  uint  index = 0;

  ST7920WriteByte(MSG_TYPE_COMM, ST7920_COMMAND_TYPE_EXTEND);
  ST7920WriteByte(MSG_TYPE_COMM, ST7920_COMMAND_EXTEND_GRAPHIC_ON);

  for( y=0; y<32; y++)
  {
    for( x=0; x<8; x++)
    {
      ST7920SetGdramLocation(x,y);
      ST7920WriteByte(MSG_TYPE_DATA, pic[index++]);
      ST7920WriteByte(MSG_TYPE_DATA, pic[index++]);
    }
  }

  for( y=0; y<32; y++)
  {
    for( x=8; x<16; x++)
    {
      ST7920SetGdramLocation(x,y);
      ST7920WriteByte(MSG_TYPE_DATA, pic[index++]);
      ST7920WriteByte(MSG_TYPE_DATA, pic[index++]);
    }
  }
}

void ST7920DrawLine(uchar xSrc, uchar ySrc, uchar xDst, uchar yDst)
{
  uchar i,k,b;



  if( xSrc == xDst)       //  垂直线
  {
    for( i=ySrc; i <= yDst; i++) ST7920DrawDot(xSrc, i);
  }
  else if( ySrc == yDst)  //  水平线
  {
    for( i = xSrc; i <= xDst; i++) ST7920DrawDot(i, ySrc);
  }
  else                    //  斜线
  {
     k = (yDst-ySrc)/(xDst-xSrc); //  斜率
     b = ySrc - k*xSrc;
     for( i = xSrc; i <= xDst; i++) ST7920DrawDot(i, k*i+b);
  }

  ST7920WriteByte(MSG_TYPE_COMM, ST7920_COMMAND_TYPE_EXTEND);
  ST7920WriteByte(MSG_TYPE_COMM, ST7920_COMMAND_EXTEND_GRAPHIC_ON);
}


/********************************************************************
函 数 名：Delay
入口参数：ms
出口参数：无
建立日期：2007年3月3日
修改日期：
函数作用：毫秒级的延时程序，当晶振为48Mhz时，xtal=48;
说    明：
********************************************************************/
void Delay(int ms)
{
    int i;
    while(ms--)
   {
     for(i=1;i<(48*143-2);i++)
         ;
   }
}





unsigned char pic12864[]=
{
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};
上一页 12
💿 文件大小 5 K
👤 上传用户 edan1181
📂 所属分类驱动编程
🏷️ 相关标签

#arm7 #液晶屏 #驱动程序
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