【RA4M2-SENSOR】+ TFT屏显示驱动

RA4M2-SENSOR提供了SPI接口，以控制相应的外设，该接口如图1所示。

为保证后续以SPI方式驱动显示屏，先使用该接口以模拟的方式来实现显示屏的驱动。

图1 SPI接口

TFT显示屏与接口的连接关系为：

MOSI----P101

SCK- ---P102

CS----P014

DC----P015

RST----P500

为配置所用的引脚，需所用RASC对引脚加以配置，并生成相应的KEIL工程，见图2所示。

图2 引脚配置

为编译程序设计，对相关引脚输出高低电平的语句定义为：

#define lcd_CS_l()R_IOPORT_PinWrite(&IOPORT_CFG_CTRL, BSP_IO_PORT_00_PIN_14, BSP_IO_LEVEL_LOW)

#define lcd_CS_h() R_IOPORT_PinWrite(&IOPORT_CFG_CTRL, BSP_IO_PORT_00_PIN_14, BSP_IO_LEVEL_HIGH)

#define lcd_RS_l()R_IOPORT_PinWrite(&IOPORT_CFG_CTRL, BSP_IO_PORT_00_PIN_15, BSP_IO_LEVEL_LOW)

#define lcd_RS_h() R_IOPORT_PinWrite(&IOPORT_CFG_CTRL, BSP_IO_PORT_00_PIN_15, BSP_IO_LEVEL_HIGH)

#define lcd_RST_l()R_IOPORT_PinWrite(&IOPORT_CFG_CTRL, BSP_IO_PORT_05_PIN_00, BSP_IO_LEVEL_LOW)

#define lcd_RST_h() R_IOPORT_PinWrite(&IOPORT_CFG_CTRL, BSP_IO_PORT_05_PIN_00, BSP_IO_LEVEL_HIGH)

#define lcd_SDI_l()R_IOPORT_PinWrite(&IOPORT_CFG_CTRL, BSP_IO_PORT_01_PIN_01, BSP_IO_LEVEL_LOW)

#define lcd_SDI_h() R_IOPORT_PinWrite(&IOPORT_CFG_CTRL, BSP_IO_PORT_01_PIN_01, BSP_IO_LEVEL_HIGH)

#define lcd_SCK_l()R_IOPORT_PinWrite(&IOPORT_CFG_CTRL, BSP_IO_PORT_01_PIN_02, BSP_IO_LEVEL_LOW)

#define lcd_SCK_h() R_IOPORT_PinWrite(&IOPORT_CFG_CTRL, BSP_IO_PORT_01_PIN_02, BSP_IO_LEVEL_HIGH)

模拟SPI方式发送字节数据的函数为：

void LCD_Writ_Bus(unsigned char com)   
{	
    unsigned char i;
    for(i=0;i<8;i++)
	{
		if(com & 0x80)
		{
			lcd_SDI_h();
	    }
		else
		{
			lcd_SDI_l();
	    }
		com = com << 1;	
		lcd_SCK_l();
		lcd_SCK_h();
	} 	
}

显示屏的初始化函数为：

void init_lcd(void)
{
  lcd_CS_h();
  lcd_RST_l();
  R_BSP_SoftwareDelay(20, BSP_DELAY_UNITS_MILLISECONDS); 
  lcd_RST_h();
  R_BSP_SoftwareDelay(20, BSP_DELAY_UNITS_MILLISECONDS); 	
  lcd_write_reg(0x11); 
  R_BSP_SoftwareDelay(120, BSP_DELAY_UNITS_MILLISECONDS); 	
  lcd_CS_l();	
  lcd_write_reg(0xB1);
  lcd_write_dat8(0x01);
  lcd_write_dat8(0x2C);
  lcd_write_dat8(0x2D);
  lcd_write_reg(0xB2);
  lcd_write_dat8(0x01);
  lcd_write_dat8(0x2C);
  lcd_write_dat8(0x2D);
  lcd_write_reg(0xB3);
  lcd_write_dat8(0x01);
  lcd_write_dat8(0x2C);
  lcd_write_dat8(0x2D);
  lcd_write_dat8(0x01);
  lcd_write_dat8(0x2C);
  lcd_write_dat8(0x2D);
  lcd_write_reg(0xB4);
  lcd_write_dat8(0x07);
  lcd_write_reg(0xC0);
  lcd_write_dat8(0xA2);
  lcd_write_dat8(0x02);
  lcd_write_dat8(0x84);
  lcd_write_reg(0xC1);
  lcd_write_dat8(0xC5);
  lcd_write_reg(0xC2);
  lcd_write_dat8(0x0A);
  lcd_write_dat8(0x00);
  lcd_write_reg(0xC3);
  lcd_write_dat8(0x8A);
  lcd_write_dat8(0x2A);
  lcd_write_reg(0xC4);
  lcd_write_dat8(0x8A);
  lcd_write_dat8(0xEE);
  lcd_write_reg(0xC5);
  lcd_write_dat8(0x0E);
  lcd_write_reg(0x36);
  lcd_write_dat8(0xC0);
  lcd_write_reg(0xe0);
  lcd_write_dat8(0x0f);
  lcd_write_dat8(0x1a);
  lcd_write_dat8(0x0f);
  lcd_write_dat8(0x18);
  lcd_write_dat8(0x2f);
  lcd_write_dat8(0x28);
  lcd_write_dat8(0x20);
  lcd_write_dat8(0x22);
  lcd_write_dat8(0x1f);
  lcd_write_dat8(0x1b);
  lcd_write_dat8(0x23);
  lcd_write_dat8(0x37);
  lcd_write_dat8(0x00);
  lcd_write_dat8(0x07);
  lcd_write_dat8(0x02);
  lcd_write_dat8(0x10);
  lcd_write_reg(0xe1);
  lcd_write_dat8(0x0f);
  lcd_write_dat8(0x1b);
  lcd_write_dat8(0x0f);
  lcd_write_dat8(0x17);
  lcd_write_dat8(0x33);
  lcd_write_dat8(0x2c);
  lcd_write_dat8(0x29);
  lcd_write_dat8(0x2e);
  lcd_write_dat8(0x30);
  lcd_write_dat8(0x30);
  lcd_write_dat8(0x39);
  lcd_write_dat8(0x3f);
  lcd_write_dat8(0x00);
  lcd_write_dat8(0x07);
  lcd_write_dat8(0x03);
  lcd_write_dat8(0x10);
  lcd_write_reg(0x2a);
  lcd_write_dat8(0x00);
  lcd_write_dat8(0x00);
  lcd_write_dat8(0x00);
  lcd_write_dat8(0x7f);
  lcd_write_reg(0x2b);
  lcd_write_dat8(0x00);
  lcd_write_dat8(0x00);
  lcd_write_dat8(0x00);
  lcd_write_dat8(0x9f);
  lcd_write_reg(0xF0);
  lcd_write_dat8(0x01);
  lcd_write_reg(0xF6);
  lcd_write_dat8(0x00);
  lcd_write_reg(0x3A);
  lcd_write_dat8(0x05);
  lcd_write_reg(0x29);	
}

色彩清除屏幕的函数为：

void  Lcd_Clear(Color)
{
   uint16_t i,j;
   lcd_address_set(0,0,128-1,160-1);
   lcd_write_reg(0x2c);
   for(i=0;i<128;i++)
   {
              for(j=0;j<160;j++)
	      {
                    lcd_write_dat16(Color);
	       }
   }
}

字符显示函数为：

void LCD_ShowChar(uint16_t x,uint16_t y,uint8_t num,uint16_t fc,uint16_t bc,uint8_t sizey,uint8_t mode)
{
	uint8_t temp,sizex,t,m=0;
	uint16_t i,TypefaceNum;
	uint16_t x0=x;
	sizex=sizey/2;
	TypefaceNum=(sizex/8+((sizex%8)?1:0))*sizey;
	num=num-' '; 
	lcd_address_set(x,y,x+sizex-1,y+sizey-1); 
	for(i=0;i<TypefaceNum;i++)
	{ 
		if(sizey==16) temp=asc2_1608[num*16+i];
		for(t=0;t<8;t++)
		{
			if(!mode)
			{
				if(temp&(0x01<<t))lcd_write_dat16(fc);
				else lcd_write_dat16(bc);
				m++;
				if(m%sizex==0)
				{
					m=0;
					break;
				}
			}
			else
			{
				if(temp&(0x01<<t))LCD_DrawPoint(x,y,fc);
				x++;
				if((x-x0)==sizex)
				{
					x=x0;
					y++;
					break;
				}
			}
		}
	}   	 	  
}

字符串显示函数为：

void LCD_ShowString(uint16_t x,uint16_t y,const uint8_t *p,uint16_t fc,uint16_t bc,uint8_t sizey,uint8_t mode)
{         
	while(*p!='\\\\\\\\0')
	{       
		LCD_ShowChar(x,y,*p,fc,bc,sizey,mode);
		x+=sizey/2;
		p++;
	}  
}

实现显示测试的主程序为：

void hal_entry(void)
{
    	init_lcd();
	    Lcd_Clear(RED);
            LCD_ShowChar(10,10,'V',YELLOW ,RED,16,0);
	    LCD_ShowIntNum(20,10,123,3,WHITE,RED,16);
	    LCD_ShowString(10,30,"RA4M2-SENSOR",YELLOW ,RED,16,0);	
	    LCD_ShowFloatNum1(10,50,30.1415926,4,WHITE,RED,16);
	    while (1);
}

经程序的编译和下载，其测试效果如图3所示，说明驱动有效。

图3 显示效果