單片機與RA8875接法及軟件初始化之一（通過8080接口介紹）
作者：david 發(fā)表日期：2020-10-16 來源： 瀏覽：
本篇文章主要介紹8080時序驅(qū)動RA8875
RA8875 是一個文字與繪圖模式的雙圖層液晶顯示 (TFT-LCD) 控制器，可結(jié)合文字或2D圖形應(yīng)用，最大
可支持到800*480 點分辨率的中小尺寸數(shù)字面板。內(nèi)建 768KB 顯示內(nèi)存可提供大多數(shù)使用者的應(yīng)用一個
更彈性的解決方案。此外，使用者可藉由選用外部串行式Flash 接口，支持BIG5/GB 編碼，可提供最大達
32*32 像素之的字型輸入。在圖形的使用上， RA8875 支持2D 的BTE 引擎 (Block Transfer Engine)，此
功能兼容于一般通用的2D BitBLT 功能，可處理大量圖形數(shù)據(jù)轉(zhuǎn)換與傳送。同時RA8875 也內(nèi)建幾何圖形
加速引擎 (Geometric Speed-up Engine)，提供使用者透過簡單的設(shè)定輕松畫出直線、矩形、圓形和橢圓
的幾何圖形。為了貼近終端始用者的應(yīng)用， RA8875 整合了強大的功能，如畫面卷動功能、顯示浮動窗
口、圖形Pattern 及文字放大等功能，可大量節(jié)省使用者軟件開發(fā)的時間，并提升MCU軟件的執(zhí)行效率。
RA8875 提供低成本的 8080/6800 并列式MCU 接口，由于內(nèi)建強大的硬件加速功能，可降低數(shù)據(jù)傳輸所
需的時間并且改善效率。 RA8875提供串行式 SPI/I2C 等極少量腳位的界面，內(nèi)建 4-wire 的觸控面板控制
器，以及2組脈波寬度調(diào)變 (PWM) ，可用于調(diào)整面板背光或其它應(yīng)用。相對于其它的解決方案， RA8875
是一個功能強大及低成本的彩色TFT 控制器，讓使用者順利解決軟硬件開發(fā)上的疑慮，同時達成低成本、高效能的系統(tǒng)方案。
一、硬件設(shè)計
連接DB[15:0]、CS、WE、RD等信號線。
選擇通訊時序時，硬件電路兩個腳位需要設(shè)定，本篇文章以8080時序講解，所以C86和PS引腳都接地
XI\XO為內(nèi)部晶體振蕩電路的輸入及輸出端，用來連接外部晶體振蕩器，以產(chǎn)生RA885的內(nèi)部頻率信號，晶體振蕩器選取范圍為15MHZ~30MHZ（建議可接20MHZ）
二、軟件設(shè)計
1、單片機FSMC初始化
void FSMC_LCD_Init(void)
{FSMC_NORSRAMInitTypeDef FSMC_NORSRAMInitStructure; //初始化結(jié)構(gòu)體FSMC_NORSRAMTimingInitTypeDef readWriteTiming; //時序結(jié)構(gòu)體/*使能FSMC外設(shè)時鐘*/RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC,ENABLE);//地址建立時間（ADDSET）具體實驗測試進行設(shè)置readWriteTiming.FSMC_AddressSetupTime = 0x00;//數(shù)據(jù)保持時間（DATAST）readWriteTiming.FSMC_DataSetupTime = 0x03;//地址保持時間（ADDHLD）模式B未用到readWriteTiming.FSMC_AddressHoldTime = 0x00;//設(shè)置總線轉(zhuǎn)換周期，僅用于復(fù)用模式的NOR操作readWriteTiming.FSMC_BusTurnAroundDuration = 0x00;//設(shè)置時鐘分頻，僅用于同步類型的存儲器readWriteTiming.FSMC_CLKDivision = 0x00;//數(shù)據(jù)保持時間，僅用于NORreadWriteTiming.FSMC_DataLatency = 0x00;//選擇匹配SRAM的模式readWriteTiming.FSMC_AccessMode = FSMC_AccessMode_A;// 選擇FSMC映射的存儲區(qū)域： Bank1 NORSRAMxFSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_BANK_NORSRAMx;//設(shè)置地址總線與數(shù)據(jù)總線是否復(fù)用，僅用于NORFSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;//設(shè)置要控制的存儲器類型：NOR類型FSMC_NORSRAMInitStructure.FSMC_MemoryType =FSMC_MemoryType_NOR;//存儲器數(shù)據(jù)寬度：16位FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b;//設(shè)置是否使用突發(fā)訪問模式，僅用于同步類型的存儲器FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode =FSMC_BurstAccessMode_Disable;//設(shè)置是否使能等待信號，僅用于同步類型的存儲器FSMC_NORSRAMInitStructure.FSMC_AsynchronousWait=FSMC_AsynchronousWait_Disable;//設(shè)置等待信號的有效極性，僅用于同步類型的存儲器FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low;//設(shè)置是否支持把非對齊的突發(fā)操作，僅用于同步類型的存儲器FSMC_NORSRAMInitStructure.FSMC_WrapMode = FSMC_WrapMode_Disable;//設(shè)置等待信號插入的時間，僅用于同步類型的存儲器FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState;//存儲器寫使能FSMC_NORSRAMInitStructure.FSMC_WriteOperation = FSMC_WriteOperation_Enable;//不使用等待信號FSMC_NORSRAMInitStructure.FSMC_WaitSignal = FSMC_WaitSignal_Disable;// 不使用擴展模式，讀寫使用相同的時序FSMC_NORSRAMInitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Disable;//突發(fā)寫操作FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable;//讀寫時序配置FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &readWriteTiming;//讀寫同樣時序，使用擴展模式時這個配置才有效FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct = &readWriteTiming;FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure); //初始化FSMC配置FSMC_NORSRAMCmd(FSMC_BANK_NORSRAMx, ENABLE); // 使能BANK}
2、寫入命令及寫入數(shù)據(jù)
#define ILI9341_CMD_ADDR (__IO uint16_t*)(0x60000000)#define ILI9341_DATA_ADDR (__IO uint16_t*)(0x60020000) //此處寫入命令及數(shù)據(jù)地址根據(jù)硬件連接的地址線修改__inline void ILI9341_Write_Cmd ( uint16_t usCmd )
{*ILI9341_CMD_ADDR = usCmd;}__inline void ILI9341_Write_Data ( uint16_t usData ){* ILI9341_DATA_ADDR = usData;}
3、8875初始化及液晶屏的相關(guān)初始化（以AT070TN92為例）
GPIO_ResetBits(GPIOE, GPIO_Pin_1);Delay(0xAFF);GPIO_SetBits(GPIOE, GPIO_Pin_1 ); //軟件復(fù)位Delay(0xAFF);//RA8875_PLL_iniLCD_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);/*RA8875 DMA function setting*/SROM_CLK_DIV(0); //set serial interface clock rateSerial_ROM_select1();Select_Serial_Waveform_mode3();SERIAL_ROM_Read_Cycle_5bus();SERIAL_ROM_DMA_mode();SERIAL_ROM_Signal_mode();DMA_Block_mode();/*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 58KHZPWM1_duty_cycle(0xff); //Brightness_level=10;LCD_Clear(0x001f);//
注：RA8875色彩深度 可為256/65K 色，最大支持到800*480.
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