【CW32饭盒派开发板试用体验】+TFT屏显示驱动

饭盒派开发板配置了TFT接口及相应的显示屏，其接口如图1所示。

图1 TFT显示屏接口

针对显示屏所连接的引脚，其引脚配置的函数为：

void LCD_GPIO_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStruct;
    __RCC_GPIOB_CLK_ENABLE();
    __RCC_GPIOA_CLK_ENABLE();
    GPIO_InitStruct.IT = GPIO_IT_NONE;
    GPIO_InitStruct.Mode= GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Speed= GPIO_SPEED_HIGH;
    GPIO_InitStruct.Pins= GPIO_PIN_4| GPIO_PIN_5| GPIO_PIN_6| GPIO_PIN_7;
    GPIO_Init(CW_GPIOB, &GPIO_InitStruct);
    GPIO_InitStruct.Pins= GPIO_PIN_15;
    GPIO_Init(CW_GPIOA, &GPIO_InitStruct);
}

以GPIO口模拟SPI方式字节数据的函数为：

void SPI_WriteData(unsigned char Data)
{
         unsigned char i=0;
         for(i=8;i>0;i--)
         {
             if(Data&0x80)
                LCD_SDA_SET;   
             else LCD_SDA_CLR;
             LCD_SCL_CLR;     
             LCD_SCL_SET;     
             Data<<=1; 
         }
}

用于满屏色彩彩色的函数为：

void Color_Test(void)
{
         unsigned int i=1;
         Lcd_Clear(GRAY0);
         Gui_DrawFont_GBK16(20,10,BLUE,GRAY0,"Color
Test");
         Delay(0xFFFF);
         Delay(0xFFFF);
         while(i--)
         {
                     Lcd_Clear(WHITE);
                     Delay(0xFFFF);
                     Delay(0xFFFF);
                     Lcd_Clear(BLACK);                   
                     Delay(0xFFFF);
                     Delay(0xFFFF);
                     Lcd_Clear(RED);
                     Delay(0xFFFF);
                     Delay(0xFFFF);
                     Lcd_Clear(GREEN);
                     Delay(0xFFFF);
                     Delay(0xFFFF);
                     Lcd_Clear(BLUE);
                     Delay(0xFFFF);
                     Delay(0xFFFF);
         }
}

由于在色彩刷新过程中其速度很快，因此在色彩切换时应添加必要的演示。

实现色彩测试和文本信息显示的主程序为：

int32_t main(void)
{   
GPIO_InitTypeDef GPIO_InitStruct;   
RCC_HSI_Enable(RCC_HSIOSC_DIV6);   
__RCC_GPIOA_CLK_ENABLE();   
GPIO_InitStruct.IT = GPIO_IT_NONE;   
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;   
GPIO_InitStruct.Pins = LED_GPIO_PINS;   
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;   
GPIO_Init(LED_GPIO_PORT, &GPIO_InitStruct);
__RCC_GPIOC_CLK_ENABLE();
GPIO_InitStruct.IT= GPIO_IT_NONE;   
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;   
GPIO_InitStruct.Pins = GPIO_PIN_13;   
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
Lcd_Init();
Color_Test();
Delay(0xFFFF);
Delay(0xFFFF);
Redraw_Mainmenu();
Delay(0xFFFF); 
Delay(0xFFFF);
Lcd_Clear(GRAY0);Gui_DrawFont_GBK16(15,5,BLACK,GRAY0,"HELLOworld");
Gui_DrawFont_GBK16(15,25,RED,GRAY0,"LCD OK DISPLAY");  Delay(0xFFFF);
Delay(0xFFFF);
Num_Test();
showimage(gImage_tb);
while(1);
}

经程序的编译与下载，其显示效果如图2所示。

图2 显示效果

为实现图像的显示功能，为其配置的显示函数为：

void showimage(const unsigned char *p)
{
         int i,j,k; 
         unsigned char picH,picL;
         Lcd_Clear(RED);
         for(k=0;k<3;k++)
         {
                   for(j=0;j<2;j++)
                   {
                             Lcd_SetRegion(50*j+2,50*k,50*j+49,50*k+49);                                                               
                             for(i=0;i<50*50;i++)
                             {       
                                        picL=*(p+i*2+1);
                                        picH=*(p+i*2); 
                                        LCD_WriteData_16Bit(picH<<8|picL);
                             }
                   }
         }
}

该显示函数的功能是对一幅50*50像素点的图片进行显示，并构成一个3行2列的图片阵列，其显示效果如图3所示。

图3 显示图像

为进行汉字的显示及按键的绘制，其测试函数为：

void Redraw_Mainmenu(void)
{
         Lcd_Clear(GRAY0);
         Gui_DrawFont_GBK16(15,5,BLUE,GRAY0,"实验平台");
         DisplayButtonUp(85,27,125,45);
         DisplayButtonUp(85,49,125,67);
         Delay(0xFFFF);
         Delay(0xFFFF);
}

该函数的显示效果如图4所示：

图4 显示汉字与按键

为了能在编程过程中直接以显示的内容来编写显示语句，它是通过索引表来进行转换处理的，其结构定义为：

struct typ FNT_GB162

{

unsigned char Index[2];

char Msk[32];

};

所用的字库结构为：

//宋体字5号

#define

hz16_num 100

const

struct typFNT_GB162 hz16[] = {

#if

USE_ONCHIP_FLASH_FONT

...

"实",0x02,0x00,0x01,0x00,0x7F,0xFE,0x40,0x02,0x88,0x84,0x04,0x80,0x04,0x80,0x10,0x80,0x08,0x80,0x08,0x80,0xFF,0xFE,0x01,0x40,0x02,0x20,0x04,0x10,0x18,0x08,0x60,0x04,/ "实",2 /

"验",0x00,0x20,0xF8,0x20,0x08,0x50,0x48,0x50,0x48,0x88,0x49,0x04,0x4A,0xFA,0x7C,0x00,0x04,0x44,0x04,0x24,0x1D,0x24,0xE4,0xA8,0x44,0x88,0x04,0x10,0x2B,0xFE,0x10,0x00,/ *"

验",3* /

"平",0x00,0x00,0x7F,0xFC,0x01,0x00,0x01,0x00,0x11,0x10,0x09,0x10,0x09,0x20,0x01,0x00,0xFF,0xFE,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,/ *"

平",4* /

"台",0x02,0x00,0x02,0x00,0x04,0x00,0x08,0x20,0x10,0x10,0x20,0x08,0x7F,0xFC,0x20,0x04,0x00,0x00,0x1F,0xF0,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x1F,0xF0,0x10,0x10,/ *"

台",5* /

...

#endif

0x00,

};

在需要显示自己的内容时，需使用相应的软件来提取相应的字模来完善该字库，其提取界面如图5所示，采用的格式如图6所示。

图5 提取工具

图6 提取格式