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8脚MCU点亮2.8" TFT显示屏！

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Kelan|  楼主 | 2011-11-25 11:02 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
tft显示屏, MCU, spi, pi, define
这个2.8"TFT显示屏支持2种界面的接口： 18Bit RGB接口和4线SPI接口。
采用SPI接口的时候，仅仅最少需要4个I/O即可！任何MCU都可以点亮它！

实拍图.rar (201.35 KB)
TFT28图纸.pdf (148.88 KB)

以下是测试程序：


//============================================ 程序功能： 点亮 2.8" TFT 显示屏

//----- TFT 控制器: HX8347-G (最新IC版本）
//----- 硬件连接方式：4根数据线+电源线(+3.3V,GND)



//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------

#include <c8051f340.h>   // SFR declarations
#include <intrins.h>  //--- _nop_() Used



//===============================  

sbit nRES  = P3^0;  //--- 复位信号   
sbit nCS   = P3^1;  //--- 片选信号
sbit SCK   = P3^2;  //--- 时钟信号
sbit SDO   = P3^3;  //--- 输出信号
sbit SDI   = P3^4;  //--- 输入信号(可不用)


#define START_BYTE 0x70  
#define SET_INDEX   0x00      
#define READ_STATUS 0x01      
#define WRITE_REG   0x02      
#define READ_REG    0x03   

/*******************************************************************************/



#define CLR_SPI_CLK do { SCK = 0; ndelay();}while(0)  
#define SET_SPI_CLK do { SCK = 1; ndelay();}while(0)  

#define CLR_SPI_MOSI do { SDO = 0; ndelay();}while(0)  
#define SET_SPI_MOSI do { SDO = 1; ndelay();}while(0)  



/*******************************************************************************/
#define SPI_Enable  do { SCK = 1; ndelay(); nCS = 0; ndelay();}while(0);
#define SPI_Disable  do { SCK = 1; ndelay(); nCS = 1; ndelay();}while(0);




/************************************* 延时子程序 *********************/
void ndelay(void);
void mdelay(unsigned int msec);

/************************************* TFT驱动子程序 *******************/
void SPISend(unsigned char spi_bValue);
void SPISend16(unsigned int spi_bValue);
   
void WriteCOM(unsigned char mNULL,unsigned char cmd);
void WriteDAT(unsigned char mNULL,unsigned char dat);

void Show_RGB(void);



/-----------------------------------------------------------------------------
// main() Routine
//-----------------------------------------------------------------------------
void main (void)  
{
   //........  

   Init_LCD(); //--- 初始化LCD

   Show_RGB(); //---显示RGB三色带
   
   while(1);


}

void Show_RGB(void)
{
    unsigned int k;     


WriteCOM(0x00,0x22); //Start GRAM write

SPI_Enable  

SPISend(START_BYTE | WRITE_REG);


//============================= Red
for(k=0;k<19200;k++)
{
   SPISend16(0xF800);   
}


//============================= Green
for(k=0;k<19200;k++)
{
   SPISend16(0x001F);   
}


//============================= Blue
for(k=0;k<19200;k++)
{
   SPISend16(0x0FE0);   
}

//============================= White
for(k=0;k<19200;k++)
{
   SPISend16(0xFFFF);   
}

SPI_Disable  


}


//----------------------- 初始化2.8" TFT 显示屏
void Init_LCD(void)     
{   
   nRES = 0;
   mdelay(250); //--- Delay 250ms  

   nRES = 1;
   mdelay(250); //--- Delay 250ms  

//=============================

//Driving ability Setting
WriteCOM(0x00,0xEA);WriteDAT(0x00,0x00); //PTBA[15:8]
WriteCOM(0x00,0xEB);WriteDAT(0x00,0x20); //PTBA[7:0]
WriteCOM(0x00,0xEC);WriteDAT(0x00,0x3C); //STBA[15:8]
WriteCOM(0x00,0xED);WriteDAT(0x00,0xC4); //STBA[7:0]
WriteCOM(0x00,0xE8);WriteDAT(0x00,0x48); //OPON[7:0]
WriteCOM(0x00,0xE9);WriteDAT(0x00,0x38); //OPON1[7:0]
WriteCOM(0x00,0xF1);WriteDAT(0x00,0x01); //OTPS1B
WriteCOM(0x00,0xF2);WriteDAT(0x00,0x08); //GEN

//Gamma 2.2 Setting

WriteCOM(0x00,0x40);WriteDAT(0x00,0x01); //
WriteCOM(0x00,0x41);WriteDAT(0x00,0x07); //
WriteCOM(0x00,0x42);WriteDAT(0x00,0x09); //
WriteCOM(0x00,0x43);WriteDAT(0x00,0x19); //
WriteCOM(0x00,0x44);WriteDAT(0x00,0x14); //
WriteCOM(0x00,0x45);WriteDAT(0x00,0x0B); //
WriteCOM(0x00,0x46);WriteDAT(0x00,0x18); //
WriteCOM(0x00,0x47);WriteDAT(0x00,0x61); //
WriteCOM(0x00,0x48);WriteDAT(0x00,0x00); //
WriteCOM(0x00,0x49);WriteDAT(0x00,0x10); //
WriteCOM(0x00,0x4A);WriteDAT(0x00,0x15); //
WriteCOM(0x00,0x4B);WriteDAT(0x00,0x15); //
WriteCOM(0x00,0x4C);WriteDAT(0x00,0x10); //

WriteCOM(0x00,0x50);WriteDAT(0x00,0x19); //
WriteCOM(0x00,0x51);WriteDAT(0x00,0x24); //
WriteCOM(0x00,0x52);WriteDAT(0x00,0x21); //
WriteCOM(0x00,0x53);WriteDAT(0x00,0x29); //
WriteCOM(0x00,0x54);WriteDAT(0x00,0x38); //
WriteCOM(0x00,0x55);WriteDAT(0x00,0x3E); //
WriteCOM(0x00,0x56);WriteDAT(0x00,0x10); //
WriteCOM(0x00,0x57);WriteDAT(0x00,0x5A); //
WriteCOM(0x00,0x58);WriteDAT(0x00,0x09); //
WriteCOM(0x00,0x59);WriteDAT(0x00,0x04); //
WriteCOM(0x00,0x5A);WriteDAT(0x00,0x02); //
WriteCOM(0x00,0x5B);WriteDAT(0x00,0x04); //
WriteCOM(0x00,0x5C);WriteDAT(0x00,0x1D); //
WriteCOM(0x00,0x5D);WriteDAT(0x00,0xCC); //
WriteCOM(0x00,0x1B);WriteDAT(0x00,0x16); //VRH=4.65V
WriteCOM(0x00,0x1A);WriteDAT(0x00,0x01); //BT (VGH~15V);WriteDAT(0x00,VGL~-10V);WriteDAT(0x00,DDVDH~5V)
WriteCOM(0x00,0x23);WriteDAT(0x00,0x70); //VMH(VCOM High voltage ~4.2V)
WriteCOM(0x00,0x24);WriteDAT(0x00,0x93); //VML(VCOM Low voltage -1.2V)

//****VCOM offset**///
WriteCOM(0x00,0x23);WriteDAT(0x00,0x59); //for Flicker adjust //can reload from OTP

//Power on Setting
WriteCOM(0x00,0x18);WriteDAT(0x00,0x3A); //I/P_RADJ);WriteDAT(0x00,N/P_RADJ);WriteDAT(0x00, Normal mode 90Hz
WriteCOM(0x00,0x19);WriteDAT(0x00,0x01); //OSC_EN='1');WriteDAT(0x00, start Osc
WriteCOM(0x00,0x01);WriteDAT(0x00,0x00); //DP_STB='0');WriteDAT(0x00, out deep sleep
WriteCOM(0x00,0x1F);WriteDAT(0x00,0x8A);// GAS=1);WriteDAT(0x00, VOMG=00);WriteDAT(0x00, PON=0);WriteDAT(0x00, DK=1);WriteDAT(0x00, XDK=0);WriteDAT(0x00, DVDH_TRI=1);WriteDAT(0x00, STB=0
mdelay(100);
WriteCOM(0x00,0x1F);WriteDAT(0x00,0x82);// GAS=1);WriteDAT(0x00, VOMG=00);WriteDAT(0x00, PON=0);WriteDAT(0x00, DK=0);WriteDAT(0x00, XDK=0);WriteDAT(0x00, DVDH_TRI=1);WriteDAT(0x00, STB=0
mdelay(100);
WriteCOM(0x00,0x1F);WriteDAT(0x00,0x92);// GAS=1);WriteDAT(0x00, VOMG=00);WriteDAT(0x00, PON=1);WriteDAT(0x00, DK=0);WriteDAT(0x00, XDK=0);WriteDAT(0x00, DVDH_TRI=1);WriteDAT(0x00, STB=0
mdelay(100);
WriteCOM(0x00,0x1F);WriteDAT(0x00,0xD2);// GAS=1);WriteDAT(0x00, VOMG=10);WriteDAT(0x00, PON=1);WriteDAT(0x00, DK=0);WriteDAT(0x00, XDK=0);WriteDAT(0x00, DDVDH_TRI=1);WriteDAT(0x00, STB=0
mdelay(100);


//262k/65k color selection
WriteCOM(0x00,0x17);WriteDAT(0x00,0x05); //default 0x06 262k color // 0x05 65k color

//SET PANEL
WriteCOM(0x00,0x36);WriteDAT(0x00,0x09); //SS_P);WriteDAT(0x00, GS_P);WriteDAT(0x00,REV_P);WriteDAT(0x00,BGR_P

//Display ON Setting
WriteCOM(0x00,0x28);WriteDAT(0x00,0x38); //GON=1);WriteDAT(0x00, DTE=1);WriteDAT(0x00, D=1000

mdelay(100);
WriteCOM(0x00,0x28);WriteDAT(0x00,0x3F); //GON=1);WriteDAT(0x00, DTE=1);WriteDAT(0x00, D=1100

//Set GRAM Area
WriteCOM(0x00,0x02);WriteDAT(0x00,0x00);
WriteCOM(0x00,0x03);WriteDAT(0x00,0x00); //Column Start
WriteCOM(0x00,0x04);WriteDAT(0x00,0x00);
WriteCOM(0x00,0x05);WriteDAT(0x00,0xEF); //Column End
WriteCOM(0x00,0x06);WriteDAT(0x00,0x00);
WriteCOM(0x00,0x07);WriteDAT(0x00,0x00); //Row Start
WriteCOM(0x00,0x08);WriteDAT(0x00,0x01);
WriteCOM(0x00,0x09);WriteDAT(0x00,0x3F); //Row End

WriteCOM(0x00,0x31);WriteDAT(0x00,0x01); // System Interface(SPI)

}  

void WriteCOM(unsigned char mNULL,unsigned char cmd)
{
    mNULL++;
   
SPI_Enable

SPISend(START_BYTE | SET_INDEX); // for register index     
SPISend(cmd);  

SPI_Disable
}

void WriteDAT(unsigned char mNULL,unsigned char dat)
{
    mNULL++;
   
SPI_Enable

SPISend(START_BYTE | WRITE_REG);
SPISend(dat);  

SPI_Disable
}


void mdelay(unsigned int msec)
{
    while(msec--)
{
       ndelay();
}
}

/*******************************************************************************/
void SPISend(unsigned char spi_bValue)   
{   
unsigned char i;   

for(i=0; i<8; i++)  
{   
CLR_SPI_CLK;
   
   if (spi_bValue & 0x80)  
{
      SET_SPI_MOSI;   
}  
else  
{
       CLR_SPI_MOSI;  
}  
         
SET_SPI_CLK;   
   
spi_bValue  <<= 1;   
}
}   

void SPISend16(unsigned int spi_bValue)   
{   
unsigned char i;   

for(i=0; i<16; i++)  
{   
CLR_SPI_CLK;
   
   if (spi_bValue & 0x8000)  
{
      SET_SPI_MOSI;   
}  
else  
{
       CLR_SPI_MOSI;  
}  
         
SET_SPI_CLK;   
   
spi_bValue  <<= 1;   
}
}   



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沙发
joyme| | 2011-11-25 17:46 | 只看该作者
这个不错，感兴趣，MCU的SPI速度能达到流畅显示吗？一幅图片要多久才能显示完整，配合一个能读卡的MCU解码JPEG图片再显示的可行性如何？

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板凳
Kelan|  楼主 | 2011-11-25 19:57 | 只看该作者
该TFT的SPI输入时钟最高允许速度为50MHz， 50x10^6/320x240x2x8 大概为40帧/s.

"配合一个能读卡的MCU解码JPEG图片再显示的可行性如何？"
---- 当然没问题,不一定要解码，直接把待显示的数据放在SD卡或SPI Flash(8脚）也可以。

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地板
Simon21ic| | 2013-3-11 22:22 | 只看该作者
那个8脚的MCU，SPI能到50MHz?

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5楼
ZOUWEN1| | 2013-3-11 22:48 | 只看该作者

那个8脚的MCU，SPI能到50MHz? ,采用的普通IO模拟的，应在在20MHz之内。

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