ST7920 12864 经典函数

void  LCD12864Init(void)           //LCD12864字库初始化程序

{
 Delay_nms(100); //大于40MS的延时程序            
 PSB = 1;  //设置为8BIT并口工作模式
 Delay_nus(1);
 RST = 0;
 Delay_nms(100); //大于40MS的延时程序             
 RST = 1;  //复位置高
 Delay_nms(100);
 
 
 Delay_nms(50);
 LCD12864_Write(COMMAND,0x30);  //Extended Function Set :8BIT设置,RE=0: basic instruction set, G=0 :graphic display OFF
 Delay_nms(120);         //大于100uS的延时程序
 LCD12864_Write(COMMAND,0x30);  //Function Set
 Delay_nms(40);          //大于37uS的延时程序
 LCD12864_Write(COMMAND,0xC0);  //Display on Control
 Delay_nms(120);         //大于100uS的延时程序
 LCD12864_Write(COMMAND,0x10);  //Cursor Display Control光标设置
 Delay_nms(120);         //大于100uS的延时程序
 LCD12864_Write(COMMAND,0x0C);  //Display Control,D=1,显示开
 Delay_nms(120);         //大于100uS的延时程序
 LCD12864_Write(COMMAND,0x01);  //Display Clear
 Delay_nms(15);          //大于10mS的延时程序
 LCD12864_Write(COMMAND,0x06);  //Enry Mode Set,光标从右向左加1位移动
 Delay_nms(120);         //大于100uS的延时程序
 
 
}
 
void LCD12864WaitForReady(void)
{
    unsigned char temp;
#ifdef _Use_LCD12864OnlyWrite
 Delay_nus(30);
#else
 LCD12864_SetReadData;
 LCD12864_RS = 0;
 LCD12864_RW = 1;
  
 do
 {
        LCD12864_EN = Enable;
  Delay_nus(1);
  temp = LCD12864_Data_PIN;
  Delay_nus(1);
  LCD12864_EN = Disable;
 }while (temp & 0x80);  //RW=1,读PD7，为0表示空闲；
 
    LCD12864_EN = Disable;
 LCD12864_SetWriteData;
 
#endif
}
 
void LCD12864_Write(unsigned char cmdordata,unsigned char Data)  //传送数据或者命令,当cmdordata=0是,传送命令,当cmdordata=1,传送数据.
{
    LCD12864WaitForReady();
 LCD12864_EN = 0;
 LCD12864_RW = 0;
 Delay_nus(1);
 if(cmdordata == 0)
 {
  LCD12864_RS = 0;
 }
 else
 {
  LCD12864_RS = 1;
 }
 Delay_nus(1);
 LCD12864_Data_Port = Data;
 LCD12864_EN = 1;
 Delay_nus(1);
 LCD12864_EN = 0;
}
 
unsigned char LCD12864_Read(void)
{
 unsigned char data;
    LCD12864WaitForReady();
 LCD12864_SetReadData;
 LCD12864_RS = 1;
 Delay_nus(1);
 LCD12864_RW = 1;
    Delay_nus(1);
 LCD12864_EN = 1;
 Delay_nus(1);
 data = LCD12864_Data_PIN;
 LCD12864_EN = 0;
 LCD12864_SetWriteData;
 return data;
}
void LCD12864_Clean(void)
{
    unsigned char x,y;
    LCD12864_Write(COMMAND,GRAPH_ON);
    LCD12864Init();     //设置扩展指令集，按手册说明，仅设置了绘图位，
    LCD12864_Write(COMMAND,GRAPH_ON); //需要两次，本次设置扩展指令集。
 
    for (y=0;y<32;y++)
    {
        LCD12864_Write(COMMAND,0x80+y); //设置y=0000+000x，y+1则往下一行
        LCD12864_Write(COMMAND,0x80); //设置x=0000 0000
        for (x=0;x<16;x++)
        {
            LCD12864_Write(DATA,0x00);   //高字节数据
            LCD12864_Write(DATA,0x00); //低字节数据
        }
    }
}
void Serial_DDRAM_Address_Set(unsigned char ucDDramAdd)
{
 LCD12864_Write(COMMAND,BASIC_FUNCTION);   //基本指令集
 LCD12864_Write(COMMAND,ucDDramAdd);    //设定DDRAM地址到地址计数器AC
}
void Overturn_Char(unsigned char x,unsigned char y,unsigned char wide,unsigned char cor)
{
    unsigned char i,base_x,colour;
 if(cor == 1) colour = 0xFF;
 if(cor == 0) colour = 0x00;
 LCD12864_Write(COMMAND,GRAPH_OFF);
 if(y == 1 || y == 2)    base_x = 0x80;
 if(y == 3 || y == 4)    base_x = 0x88;
    if(x % 2)
 {
     for(i = 0;i < wide; i ++)
  {
         LCD12864_Write(COMMAND,0X80 - 16 + y * 16 + i);
         LCD12864_Write(COMMAND,base_x+(x/2));
      LCD12864_Write(DATA,colour);
      LCD12864_Write(DATA,0x00);
  }
 }
 else
 {
     for(i = 0;i < wide; i ++)
  {
         LCD12864_Write(COMMAND,0X80 - 16 + y * 16 + i);
         LCD12864_Write(COMMAND,base_x+(x/2)-1);
      LCD12864_Write(DATA,0x00);
      LCD12864_Write(DATA,colour);
  }
 }
 LCD12864_Write(COMMAND,GRAPH_ON); 
}
void Overturn_Font(unsigned char x,unsigned char y,unsigned char wide,unsigned char cor)
{
    unsigned char i,base_x,colour;
 if(cor == 1) colour = 0xFF;
 if(cor == 0) colour = 0x00;
 LCD12864_Write(COMMAND,GRAPH_OFF);
 if(y == 1 || y == 2)    base_x = 0x80;
 if(y == 3 || y == 4)    base_x = 0x88;
 
    for(i = 0;i < wide;i ++)
 {
     LCD12864_Write(COMMAND,0X80 - 16 + y * 16 + i); //- 16 + y * 16 + i);
     LCD12864_Write(COMMAND,base_x+x-1);
  LCD12864_Write(DATA,colour);
  LCD12864_Write(DATA,colour);
 }
 LCD12864_Write(COMMAND,GRAPH_ON);
}
void GUI_Point(unsigned char y,unsigned char x,unsigned colour)
{
    unsigned char GDRAM_hbit,GDRAM_lbit;
    unsigned char x_Dyte,x_byte;                 //定义列地址的字节位，及在字节中的哪1位
    unsigned char y_Dyte,y_byte;      
    x--;y--;          //定义为上下两个屏(取值为0，1)，行地址(取值为0~31)
  
    x_Dyte=y/16;                                         //计算在16个字节中的哪一个
    x_byte=y&0x0f;                                     //计算在该字节中的哪一位
    y_Dyte=x/32;                                         //0为上半屏，1为下半屏
    y_byte=x&0x1f;                                     //计算在0~31当中的哪一行
  
    LCD12864_Write(COMMAND,0x80+y_byte);                     //设定行地址(y坐标)
    LCD12864_Write(COMMAND,0x80+x_Dyte+8*y_Dyte);         //设定列地址(x坐标)，并通过8*y_Dyte选定上下屏
                          
    LCD12864_Read();
    GDRAM_hbit=LCD12864_Read();                         //读取当前显示高8位数据
    GDRAM_lbit=LCD12864_Read();                         //读取当前显示低8位数据
    Delay_nus(1);
  
    if(colour==1)
    {
  LCD12864_Write(COMMAND,0x80+y_byte);                     //设定行地址(y坐标)
  LCD12864_Write(COMMAND,0x80+x_Dyte+8*y_Dyte);         //设定列地址(x坐标)，并通过8*y_Dyte选定上下屏
  Delay_nus(1);
 
        if(x_byte<8)                                             //判断其在高8位，还是在低8位
  {
   LCD12864_Write(DATA,GDRAM_hbit|(0X01<<(7-x_byte)));     //显示GDRAM区高8位数据
   LCD12864_Write(DATA,GDRAM_lbit);                             //显示GDRAM区低8位数据
        }
        else
        {
   LCD12864_Write(DATA,GDRAM_hbit);
   LCD12864_Write(DATA,GDRAM_lbit|(0x01<<(15-x_byte)));
        }
    }
    else
    {
  LCD12864_Write(COMMAND,0x80+y_byte);                     //设定行地址(y坐标)
  LCD12864_Write(COMMAND,0x80+x_Dyte+8*y_Dyte);         //设定列地址(x坐标)，并通过8*y_Dyte选定上下屏
  Delay_nus(1);
 
        if(x_byte<8)                                             //判断其在高8位，还是在低8位
  {
   LCD12864_Write(DATA,GDRAM_hbit & ~(0X01<<(7-x_byte)));     //显示GDRAM区高8位数据
   LCD12864_Write(DATA,GDRAM_lbit);                             //显示GDRAM区低8位数据
        }
        else
        {
   LCD12864_Write(DATA,GDRAM_hbit);
   LCD12864_Write(DATA,GDRAM_lbit & ~(0x01<<(15-x_byte)));
        }
 }
 
}
 
void GUI_Line(unsigned char x0,unsigned char y0,unsigned char x1,unsigned char y1,unsigned char colour)
{
    int temp;
    int dx,dy;               //定义起点到终点的横、纵坐标增加值
    int s1,s2,status,i;
    int Dx,Dy,sub;
 
    dx = x1 - x0;
    if(dx >= 0)                 //X的方向是增加的
        s1 = 1;
    else                     //X的方向是降低的
        s1 = -1;   
    dy = y1 - y0;                 //判断Y的方向是增加还是降到的
    if(dy >= 0)
        s2 = 1;
    else
        s2 =- 1;
 
    Dx = abs(x1-x0);             //计算横、纵标志增加值的绝对值
    Dy = abs(y1-y0);
     
    if(Dy > Dx)                            
    {                     //以45度角为分界线，靠进Y轴是status=1,靠近X轴是status=0
        temp = Dx;
        Dx = Dy;
        Dy = temp;
    status = 1;
    }
    else
        status = 0;
 
 
 
    sub = Dy + Dy - Dx;                 //第1次判断下个点的位置
    for(i = 0;i < Dx;i ++)
    {
        GUI_Point(x0,y0,colour);           //画点
        if(sub >= 0)                             
        {
            if(status == 1)               //在靠近Y轴区，x值加1
                x0 += s1;
            else                     //在靠近X轴区，y值加1             
                y0 += s2;
            sub -= (Dx + Dx);                 //判断下下个点的位置
        }
        if(status == 1)
            y0 += s2;
        else     
            x0 += s1;
        sub += Dy + Dy;
      
    }
}
 
void plotC(int x,int y,int xc,int yc,unsigned char colour)
{
    GUI_Point(xc+x,yc+y,colour);
    GUI_Point(xc+x,yc-y,colour);
    GUI_Point(xc-x,yc+y,colour);
    GUI_Point(xc-x,yc-y,colour);
    GUI_Point(xc+y,yc+x,colour);
    GUI_Point(xc+y,yc-x,colour);
    GUI_Point(xc-y,yc+x,colour);
    GUI_Point(xc-y,yc-x,colour);
}
 
void GUI_Circle(int xc,int yc,int r,unsigned char colour)
{
    int x,y,d;
    y = r;
    d = 3 - (r + r);
    x = 0;
    while(x <= y)
    {
        plotC(x,y,xc,yc,colour);
        if(d < 0)
            d += (x + x + x + x) + 6;
        else
        {
            d+=((x - y) + (x - y) + (x - y) + (x - y)) + 10;
            y = y - 1;
        }
        x = x + 1;
    }
}
void GUI_Full(unsigned char x0,unsigned char y0,unsigned char x1,unsigned char y1,unsigned char colour)
{
    unsigned char i,j;
 for(j = y0;j <= y1;j ++)
     for(i = x0;i <= x1;i ++)
      GUI_Point(i,j,colour);
}