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 datado{SDO = 1; //SET SDA=1 is let this singal keeping in input mode before read dataSCK = 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 displayLCD_DataWrite(0x0F); // if 16bit MCU interface and 65k color displaydelay_us(1);LCD_CmdWrite(0x04); //PCLK inverseLCD_DataWrite(0x81);delay_ms(1);//Horizontal setLCD_CmdWrite(0x14); //HDWR//Horizontal Display Width Setting Bit[6:0]LCD_DataWrite(0x63);//Horizontal display width(pixels) = (HDWR + 1)*8LCD_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)*8LCD_CmdWrite(0x17); //HSTR//HSYNC Start Position[4:0]LCD_DataWrite(0x02);//HSYNC Start Position(PCLK) = (HSTR + 1)*8LCD_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 setLCD_CmdWrite(0x19); //VDHR0 //Vertical Display Height Bit [7:0]LCD_DataWrite(0xdf);//Vertical pixels = VDHR + 1LCD_CmdWrite(0x1a); //VDHR1 //Vertical Display Height Bit [8]LCD_DataWrite(0x01);//Vertical pixels = VDHR + 1LCD_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 XLCD_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 YLCD_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 depthMemory_16bpp_Mode(); //[5Eh]Set active memory color depthSelect_PIP1_Window_16bpp(); //[11h] PIP 1 Window Color DepthSelect_PIP2_Window_16bpp(); //[11h] PIP 2 Window Color DepthBTE_S0_Color_16bpp(); //[92h] Source_0 Color DepthBTE_S1_Color_16bpp(); //[92h] Source_1 Color DepthBTE_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); //RA8875Geometric_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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