RT-Thread-AB32VG1的TFT LCD屏测试RT-Thread问答社区

AB32VG1的TFT LCD屏测试

发布于 2021-03-31 17:49:38 浏览：1289 订阅该版

本次使用的是2.2寸的TFT SPI LCD屏!![dd.jpg](https://oss-club.rt-thread.org/uploads/20210331/28d4c5a2093a46aafc323f1ab316792d.jpg)
                     TFT LCD 屏
![yj.jpg](https://oss-club.rt-thread.org/uploads/20210331/9b84443090f0c8addbbf10671fe73a84.jpg)
                   板上引脚图
引脚定义
uint8_t LCD_LED;     //PA.7--->>TFT --BL
uint8_t LCD_RS;      //PF.1--->>TFT --RS/DC
uint8_t LCD_CS;      //PA.0--->>TFT --CS/CE
uint8_t LCD_RST;     //PA.5-->>TFT --RST
uint8_t LCD_SCL;     //PA.1--->>TFT --SCL/SCK
uint8_t LCD_SDA;     //PF.0 MOSI--->>TFT --SDA/DIN

宏定义，LCD的像素大小，支持横竖屏
```
//屏幕物理像素设置
#define X_MAX_PIXEL         LCD_Y_SIZE
#define Y_MAX_PIXEL         LCD_X_SIZE

//支持横竖屏快速定义切换
#define USE_HORIZONTAL          1   //定义是否使用横屏      0,不使用.1,使用.

#ifdef USE_HORIZONTAL//如果定义了横屏
#define X_MAX_PIXEL         LCD_Y_SIZE
#define Y_MAX_PIXEL         LCD_X_SIZE
#else
#define X_MAX_PIXEL         LCD_X_SIZE
#define Y_MAX_PIXEL         LCD_Y_SIZE
#endif

#define RED     0xf800
#define GREEN   0x07e0
#define BLUE    0x001f
#define WHITE   0xffff
#define BLACK   0x0000
#define YELLOW  0xFFE0
#define GRAY0   0xEF7D      //灰色0 3165 00110 001011 00101
#define GRAY1   0x8410          //灰色1      00000 000000 00000
#define GRAY2   0x4208          //灰色2  1111111111011111
```
```
void LCD_GPIO_Init(void){

LCD_LED = rt_pin_get("PA.7"); //PA.7--->>TFT --BL
    LCD_RS  = rt_pin_get("PF.1"); //PF.1--->>TFT --RS/DC
    LCD_CS  = rt_pin_get("PA.0"); //PA.0--->>TFT --CS/CE
    LCD_RST = rt_pin_get("PA.5"); //PA.5-->>TFT --RST

LCD_SCL = rt_pin_get("PA.1"); //PA.1--->>TFT --SCL/SCK
    LCD_SDA = rt_pin_get("PF.0"); //PF.0 MOSI--->>TFT --SDA/DIN

rt_pin_mode(LCD_LED, PIN_MODE_OUTPUT);
    rt_pin_mode(LCD_RS, PIN_MODE_OUTPUT);
    rt_pin_mode(LCD_CS, PIN_MODE_OUTPUT);
    rt_pin_mode(LCD_RST, PIN_MODE_OUTPUT);
    rt_pin_mode(LCD_SCL, PIN_MODE_OUTPUT);
    rt_pin_mode(LCD_SDA, PIN_MODE_OUTPUT);
}
```
软件模拟SPI的写数据的实现
```
void  SPI_WriteData(uint8_t Data)
{
    uint8_t i=0;
    for(i=8;i>0;i--)
    {
       if(Data&0x80){
          LCD_SDA_SET; //输出数据
       }
       else{
          LCD_SDA_CLR;
       }
      LCD_SCL_CLR;
      Data<<=1;
      LCD_SCL_SET;
    }
}
/****************************************************************************
* 名    称：Lcd_WriteIndex(uint8_t Index)
* 功    能：向液晶屏写一个8位指令
* 入口参数：Index   寄存器地址
* 出口参数：无
* 说    明：调用前需先选中控制器，内部函数
****************************************************************************/
void Lcd_WriteIndex(uint8_t Index)
{
   LCD_CS_CLR;
   LCD_RS_CLR;
   SPI_WriteData(Index);
   LCD_CS_SET;
}

/****************************************************************************
* 名    称：Lcd_WriteData(uint8_t Data)
* 功    能：向液晶屏写一个8位数据
* 入口参数：dat     寄存器数据
* 出口参数：无
* 说    明：向控制器指定地址写入数据，内部函数
****************************************************************************/
void Lcd_WriteData(uint8_t Data)
{
   LCD_CS_CLR;
   LCD_RS_SET;
   SPI_WriteData(Data);
   LCD_CS_SET;
}

/****************************************************************************
* 名    称：void LCD_WriteReg(uint8_t Index,uint16_t Data)
* 功    能：写寄存器数据
* 入口参数：Index,Data
* 出口参数：无
* 说    明：本函数为组合函数，向Index地址的寄存器写入Data值
****************************************************************************/
void LCD_WriteReg(uint8_t Index,uint16_t Data)
{
    Lcd_WriteIndex(Index);
    Lcd_WriteData_16Bit(Data);
}

/****************************************************************************
* 名    称：void Lcd_WriteData_16Bit(uint16_t Data)
* 功    能：向液晶屏写一个16位数据
* 入口参数：Data
* 出口参数：无
* 说    明：向控制器指定地址写入一个16位数据
****************************************************************************/
void Lcd_WriteData_16Bit(uint16_t Data)
{
    Lcd_WriteData(Data>>8);
    Lcd_WriteData(Data);
}

/****************************************************************************
* 名    称：void Lcd_Reset(void)
* 功    能：液晶硬复位函数
* 入口参数：无
* 出口参数：无
* 说    明：液晶初始化前需执行一次复位操作
****************************************************************************/
void Lcd_Reset(void)
{
    LCD_RST_CLR;
    rt_thread_mdelay(100);
    LCD_RST_SET;
    rt_thread_mdelay(50);
}
/****************************************************************************
* 名    称：void Lcd_Init(void)
* 功    能：液晶初始化函数
* 入口参数：无
* 出口参数：无
* 说    明：液晶初始化_ILI9225_176X220
****************************************************************************/
void Lcd_Init(void)
{
    LCD_GPIO_Init();//使用模拟SPI
    Lcd_Reset(); //Reset before LCD Init.

Lcd_WriteIndex(0xCB);
        Lcd_WriteData(0x39);
        Lcd_WriteData(0x2C);
        Lcd_WriteData(0x00);
        Lcd_WriteData(0x34);
        Lcd_WriteData(0x02);

Lcd_WriteIndex(0xCF);
        Lcd_WriteData(0x00);
        Lcd_WriteData(0XC1);
        Lcd_WriteData(0X30);

Lcd_WriteIndex(0xE8);
        Lcd_WriteData(0x85);
        Lcd_WriteData(0x00);
        Lcd_WriteData(0x78);

Lcd_WriteIndex(0xEA);
        Lcd_WriteData(0x00);
        Lcd_WriteData(0x00);

Lcd_WriteIndex(0xED);
        Lcd_WriteData(0x64);
        Lcd_WriteData(0x03);
        Lcd_WriteData(0X12);
        Lcd_WriteData(0X81);

Lcd_WriteIndex(0xF7);
        Lcd_WriteData(0x20);

Lcd_WriteIndex(0xC0);    //Power control
        Lcd_WriteData(0x23);   //VRH[5:0]

Lcd_WriteIndex(0xC1);    //Power control
        Lcd_WriteData(0x10);   //SAP[2:0];BT[3:0]

Lcd_WriteIndex(0xC5);    //VCM control
        Lcd_WriteData(0x3e); //对比度调节
        Lcd_WriteData(0x28);

Lcd_WriteIndex(0xC7);    //VCM control2
        Lcd_WriteData(0x86);  //--

Lcd_WriteIndex(0x36);    // Memory Access Control
#ifdef USE_HORIZONTAL
        Lcd_WriteData(0xE8); //C8      //48 68竖屏//28 E8 横屏
#else
        Lcd_WriteData(0x48);
#endif

Lcd_WriteIndex(0x3A);
        Lcd_WriteData(0x55);

Lcd_WriteIndex(0xB1);
        Lcd_WriteData(0x00);
        Lcd_WriteData(0x18);

Lcd_WriteIndex(0xB6);    // Display Function Control
        Lcd_WriteData(0x08);
        Lcd_WriteData(0x82);
        Lcd_WriteData(0x27);

Lcd_WriteIndex(0xF2);    // 3Gamma Function Disable
        Lcd_WriteData(0x00);

Lcd_WriteIndex(0x26);    //Gamma curve selected
        Lcd_WriteData(0x01);

Lcd_WriteIndex(0xE0);    //Set Gamma
        Lcd_WriteData(0x0F);
        Lcd_WriteData(0x31);
        Lcd_WriteData(0x2B);
        Lcd_WriteData(0x0C);
        Lcd_WriteData(0x0E);
        Lcd_WriteData(0x08);
        Lcd_WriteData(0x4E);
        Lcd_WriteData(0xF1);
        Lcd_WriteData(0x37);
        Lcd_WriteData(0x07);
        Lcd_WriteData(0x10);
        Lcd_WriteData(0x03);
        Lcd_WriteData(0x0E);
        Lcd_WriteData(0x09);
        Lcd_WriteData(0x00);

Lcd_WriteIndex(0XE1);    //Set Gamma
        Lcd_WriteData(0x00);
        Lcd_WriteData(0x0E);
        Lcd_WriteData(0x14);
        Lcd_WriteData(0x03);
        Lcd_WriteData(0x11);
        Lcd_WriteData(0x07);
        Lcd_WriteData(0x31);
        Lcd_WriteData(0xC1);
        Lcd_WriteData(0x48);
        Lcd_WriteData(0x08);
        Lcd_WriteData(0x0F);
        Lcd_WriteData(0x0C);
        Lcd_WriteData(0x31);
        Lcd_WriteData(0x36);
        Lcd_WriteData(0x0F);

Lcd_WriteIndex(0x11);    //Exit Sleep
        rt_thread_mdelay(120);

Lcd_WriteIndex(0x29);    //Display on
        Lcd_WriteIndex(0x2c);

}

/*************************************************
函数名：LCD_Set_XY
功能：设置lcd显示起始点
入口参数：xy坐标
返回值：无
*************************************************/
void Lcd_SetXY(uint16_t Xpos, uint16_t Ypos)
{
    Lcd_WriteIndex(0x2a);
    Lcd_WriteData_16Bit(Xpos);
    Lcd_WriteIndex(0x2b);
    Lcd_WriteData_16Bit(Ypos);
    Lcd_WriteIndex(0x2c);
}
/*************************************************
函数名：LCD_Set_Region
功能：设置lcd显示区域，在此区域写点数据自动换行
入口参数：xy起点和终点
返回值：无
*************************************************/
//设置显示窗口
void Lcd_SetRegion(uint16_t xStar, uint16_t yStar,uint16_t xEnd,uint16_t yEnd)
{
    Lcd_WriteIndex(0x2a);
    Lcd_WriteData_16Bit(xStar);
    Lcd_WriteData_16Bit(xEnd);
    Lcd_WriteIndex(0x2b);
    Lcd_WriteData_16Bit(yStar);
    Lcd_WriteData_16Bit(yEnd);
    Lcd_WriteIndex(0x2c);
}

/*************************************************
函数名：LCD_DrawPoint
功能：画一个点
入口参数：xy坐标和颜色数据
返回值：无
*************************************************/
void Gui_DrawPoint(uint16_t x,uint16_t y,uint16_t Data)
{
    Lcd_SetXY(x,y);
    Lcd_WriteData_16Bit(Data);

}

/*************************************************
函数名：Lcd_Clear
功能：全屏清屏函数
入口参数：填充颜色COLOR
返回值：无
*************************************************/
void Lcd_Clear(uint16_t Color)
{
   unsigned int i,m;
   Lcd_SetRegion(0,0,X_MAX_PIXEL-1,Y_MAX_PIXEL-1);
   for(i=0;i<X_MAX_PIXEL;i++)
    for(m=0;m<Y_MAX_PIXEL;m++)
    {
        Lcd_WriteData_16Bit(Color);
    }
}
```
由于代码篇幅有点大，详细代码就不一贴上了，**完整的测试代码工程[AB32VG1_TFTLCD](https://gitee.com/ljhya/ab32_vg1_tftlcd.git)**

这次测试也是本着玩一下的心态去实现的，正巧手头上有TFT LCD屏，软件模拟的SPI通信速率还不怎样，屏幕刷新很慢，具体效果下面会贴出测试视频。期待官方推出的软件 SPI。
**已经下载到开发板的测试视频**:(https://www.bilibili.com/video/BV17V411n7b2?from=search&seid=11240481377391531503)