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51单片机+RA8875控制液晶显示 作者:David   发表日期:2021-01-11   来源:菱致电子   浏览:
本篇文章分别以AT89C51控制RA8875及RA8876为例,详细讲解8位单片机如何通过瑞佑的液晶控制芯片来进行显示控制。


一、硬件

由于8位单片机IO口有限,所以在这里选择SPI通讯方式(还可选择IIC模式)




二、软件

1、软件SPI时序

/**SPI时序**/
void SPI_Init(void)
{
 SCK = 1; 
 SDA = 1; 
    ZCS = 1;
}
 
/******************************************************************************
SPI_Write()
******************************************************************************/
void SPI_Write(unsigned char dat)
{
    unsigned char t = 8;
  do
  {
  SDA = (bit)(dat & 0x80);
  dat <<= 1;
  SCK = 0; 
                SPI_Delay();
  SCK = 1;
                SPI_Delay();
 
  } while ( --t != 0 );
    SCK = 1;
    SDA = 1;
}
 
/******************************************************************************
SPI_Read() If 4-wire SPI be used, and then the SDA singal in this subroutine should be rename to SDO 
******************************************************************************/
unsigned char SPI_Read()
{
   unsigned char dat;
   unsigned char t = 8;
 SDO = 1; //SET SDA=1 is let this singal keeping in input mode before read data
 do
 {
  SDO = 1; //SET SDA=1 is let this singal keeping in input mode before read data
  SCK = 0; 
  SPI_Delay();
  dat <<= 1;
  if ( SDO ) dat++;
  SCK = 1; 
                SPI_Delay();
 } while ( --t != 0 );
 return dat;
 
//*********4_wire_SPI****************************
 
void LCD_CmdWrite(uchar cmd)
{ uchar j; 
   SCK = 1; 
   SDA = 1; 
   ZCS = 0;   
   SPI_Delay();
   SPI_Write(0x80); 
   SPI_Write(cmd);
   SPI_Delay();
   ZCS = 1;
}
 
//----------------------//
void LCD_DataWrite(uchar Data)
    SCK = 1; 
   SDA = 1;   //
   ZCS = 0;
   SPI_Delay();
   SPI_Write(0x00); 
   SPI_Write(Data);
   SPI_Delay();
   ZCS = 1;
}
 
 
//----------------------//
uchar LCD_DataRead(void)
{
 uchar Data;
   SCK = 1; 
   SDO = 1; //
   ZCS = 0;
   SPI_Delay();
   SPI_Write(0x40);  
   Data = SPI_Read();
   SPI_Delay();
   ZCS = 1;
 
 return Data;
}  
//-----------------------//
uchar LCD_StatusRead(void)
{
 uchar Data;
 
   SCK = 1; 
   SDO = 1; //
   ZCS = 0;
   SPI_Delay();
   SPI_Write(0xc0); 
   Data = SPI_Read();
   SPI_Delay();
   ZCS = 1;
 return Data;
}

2、RA8875芯片时钟频率以及液晶屏参数设置(AT070TN92为例)

void INIT(void)
{
RST=0;
  delay_us(100);
  RST=1;
  delay_us(100);
 
//RA8875_PLL_ini();
LCD_CmdWrite(0x88);       
    LCD_DataWrite(0x0b);
    delay_ms(1);    
    LCD_CmdWrite(0x89);       
    LCD_DataWrite(0x02);  
    delay_ms(1);
 
  LCD_CmdWrite(0x10);  //SYSR   bit[4:3]=00 256 color  bit[2:1]=  00 8bit MPU interface
    //LCD_DataWrite(0x000c);   // if 8bit MCU interface   and 65k color display      
   LCD_DataWrite(0x0F); // if 16bit MCU interface   and 65k color display  
delay_us(1); 
 
LCD_CmdWrite(0x04);     //PCLK inverse 
   LCD_DataWrite(0x81);
   delay_ms(1);
  
   //Horizontal set
   LCD_CmdWrite(0x14); //HDWR//Horizontal Display Width Setting Bit[6:0]                   
   LCD_DataWrite(0x63);//Horizontal display width(pixels) = (HDWR + 1)*8 
                   
   LCD_CmdWrite(0x15); //Horizontal Non-Display Period Fine Tuning Option Register (HNDFTR)
   LCD_DataWrite(0x03);//Horizontal Non-Display Period Fine Tuning(HNDFT) [3:0]   
          
   LCD_CmdWrite(0x16); //HNDR//Horizontal Non-Display Period Bit[4:0]                      
   LCD_DataWrite(0x03);//Horizontal Non-Display Period (pixels) = (HNDR + 1)*8 
             
   LCD_CmdWrite(0x17); //HSTR//HSYNC Start Position[4:0]                                   
   LCD_DataWrite(0x02);//HSYNC Start Position(PCLK) = (HSTR + 1)*8    
                     
   LCD_CmdWrite(0x18); //HPWR//HSYNC Polarity ,The period width of HSYNC.                  
   LCD_DataWrite(0x00);//HSYNC Width [4:0]   HSYNC Pulse width(PCLK) = (HPWR + 1)*8   
 
   //Vertical set    
   LCD_CmdWrite(0x19); //VDHR0 //Vertical Display Height Bit [7:0]                         
   LCD_DataWrite(0xdf);//Vertical pixels = VDHR + 1       
                                 
   LCD_CmdWrite(0x1a); //VDHR1 //Vertical Display Height Bit [8]                           
   LCD_DataWrite(0x01);//Vertical pixels = VDHR + 1  
                                      
   LCD_CmdWrite(0x1b); //VNDR0 //Vertical Non-Display Period Bit [7:0]                     
   LCD_DataWrite(0x14);//Vertical Non-Display area = (VNDR + 1) 
                           
   LCD_CmdWrite(0x1c); //VNDR1 //Vertical Non-Display Period Bit [8]                       
   LCD_DataWrite(0x00);//Vertical Non-Display area = (VNDR + 1)  
                          
   LCD_CmdWrite(0x1d); //VSTR0 //VSYNC Start Position[7:0]                                 
   LCD_DataWrite(0x06);//VSYNC Start Position(PCLK) = (VSTR + 1)  
                          
   LCD_CmdWrite(0x1e); //VSTR1 //VSYNC Start Position[8]                                   
   LCD_DataWrite(0x00);//VSYNC Start Position(PCLK) = (VSTR + 1)   
                        
   LCD_CmdWrite(0x1f); //VPWR //VSYNC Polarity ,VSYNC Pulse Width[6:0]                     
   LCD_DataWrite(0x01);//VSYNC Pulse Width(PCLK) = (VPWR + 1)                              
 
   LCD_CmdWrite(0xf2);  
   LCD_DataWrite(0x01);
//Active window  set 
   //setting active window X
    LCD_CmdWrite(0x30); //Horizontal Start Point 0 of Active Window (HSAW0)
    LCD_DataWrite(0x00); //Horizontal Start Point of Active Window [7:0]
//delay_us(1); 
    LCD_CmdWrite(0x31); //Horizontal Start Point 1 of Active Window (HSAW1)    
    LCD_DataWrite(0x00); //Horizontal Start Point of Active Window [9:8]
//delay_us(1); 
    LCD_CmdWrite(0x34); //Horizontal End Point 0 of Active Window (HEAW0)
    LCD_DataWrite(0x1F); //Horizontal End Point of Active Window [7:0]
//delay_us(1); 
    LCD_CmdWrite(0x35); //Horizontal End Point 1 of Active Window (HEAW1)    
    LCD_DataWrite(0x03); //Horizontal End Point of Active Window [9:8]
//delay_us(1); 
 
   //setting active window Y
    LCD_CmdWrite(0x32); //Vertical Start Point 0 of Active Window (VSAW0)
    LCD_DataWrite(0x00); //Vertical Start Point of Active Window [7:0]
//delay_us(1); 
    LCD_CmdWrite(0x33); //Vertical Start Point 1 of Active Window (VSAW1)    
    LCD_DataWrite(0x00); //Vertical Start Point of Active Window [8]
//delay_us(1); 
    LCD_CmdWrite(0x36); //Vertical End Point of Active Window 0 (VEAW0)
    LCD_DataWrite(0xdf); //Vertical End Point of Active Window [7:0]
//delay_us(1); 
    LCD_CmdWrite(0x37); //Vertical End Point of Active Window 1 (VEAW1)    
    LCD_DataWrite(0x01); //Vertical End Point of Active Window [8]
 
// /*setting RA8875 display on*/
    LCD_CmdWrite(0x01); //  
    LCD_DataWrite(0x80); // 
    delay_ms(20); 
/*setting RA8875 memory clear with active window*/
    Clear_Active_Window();
 
// /*setting backlight on RA8875 PWM1 control*/
// PWM1_enable();
//    PWM1_fnuction_sel();
//    PWM1_clock_ratio(0x02); //bit0~3  58KHZ   
//    PWM1_duty_cycle(0xff); // 獹
//    Brightness_level=10;
 
 
//LCD_Clear(0xffff);//
Text_color(0xFFFF);
Geometric_Coordinate(0,800,0,480);
    Draw_square_fill();
    Chk_Busy();
}

3、RA8876芯片及液晶屏初始化函数调用(RA8876_Initial(); )

RA8876_Initial
{

RA8876_HW_Reset();
Check_IC_ready();
// System_Check_Temp();
 
RA8876_SW_Reset();
Check_IC_ready();
 
//------------------------------------
RA8876_PLL();// Set RA8876/77 PLL and Start PLL.
//------------------------------------
RA8876_SDRAM_initial();// set the SDRAM parameter.  
//------------------------------------
 
//**[01h]**//
TFT_24bit();//RA8876 only
 
//**[01h]**//
#if defined (MCU_8bit_ColorDepth_8bpp) || defined (MCU_8bit_ColorDepth_16bpp) || defined (MCU_8bit_ColorDepth_24bpp)
Host_Bus_8bit();
#endif
 
#if defined (MCU_16bit_ColorDepth_16bpp) || defined (MCU_16bit_ColorDepth_24bpp_Mode_1) || defined (MCU_16bit_ColorDepth_24bpp_Mode_2)
Host_Bus_16bit();

#endif

//**[02h]**//
Data_Format_8b_16bpp();

MemWrite_Left_Right_Top_Down();//(Default) Memory Write: Left to Right, Top to Down.
//------------------------------------
//**[03h]**//
 
Graphic_Mode();
// Text_Mode();
 
Memory_Select_SDRAM();
 
//------------------------------------

//** Set color depth, define in [UserDef.h] **//

Select_Main_Window_16bpp(); //[10h]Set main window color depth
Memory_16bpp_Mode(); //[5Eh]Set active memory color depth
 
Select_PIP1_Window_16bpp(); //[11h] PIP 1 Window Color Depth
Select_PIP2_Window_16bpp(); //[11h] PIP 2 Window Color Depth
 
BTE_S0_Color_16bpp(); //[92h] Source_0 Color Depth
BTE_S1_Color_16bpp(); //[92h] Source_1 Color Depth
BTE_Destination_Color_16bpp(); //[92h] Destination Color Depth

//**[12h]~[1Fh]]**//

Set_LCD_Panel(); // define in [UserDef.h]
 
//------------------------------------
//**[20h][21h][22h][23h]**//
Main_Image_Start_Address(0);
//**[24h][25h]**//
Main_Image_Width(2048);
//**[26h][27h][28h][29h]**//
Main_Window_Start_XY(0,0);
//**[50h][51h][52h][53h]**//
Canvas_Image_Start_address(0);
//**[54h][55h]**//
Canvas_image_width(2048);
//**[56h][57h][58h][59h]**//
Active_Window_XY(0,0);
//**[5Ah][5Bh][5Ch][5Dh]**//
Active_Window_WH(1024,600);

BTE_Solid_Fill(0,2048,0,0,0x0000,1024,600); //Memory Clear
}



三、相关API函数的调用

RA8875函数库:"RA8875_subroutine.c","lcd.c"
RA8876函数库:"RA8876.c","RA8876_API.c","RA8876_MCU_IF.c"
瑞佑芯片有非常完善方便调用的函数库,由于C51存储空间较小,建议将需要用到的函数从函数库中复制出来调用。


DEMO展示:

Text_color(Red);     //RA8875
Geometric_Coordinate(10,200,10,10);
Draw_line();
Chk_Busy();

RA8875_Draw_Circle_Square(50,50,200,200,Red);

Draw_Triangle_3point_Coordinate(10,20,80,90,80,20);
Draw_Triangle();
 
Draw_Triangle_3point_Coordinate(400,20,600,200,600,20);
Draw_Triangle_fill();
 
Circle_Coordinate_Radius(100,250,50);
Draw_circle_fill();
  Chk_Busy();
 
Text_color(Red);
Circle_Square_Coordinate_setting(300,400,0,100,10,10);
Draw_Circle_Square_fill();
Chk_Busy();

 


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