ILI9341 TFT LCD驱动器初始化配置详解

/*
  * 函数功能: 初始化LCD寄存器
  * 输入参数: 无
  * 返 回 值: 无
  * 说    明：需要配置哪些寄存器，需要设置什么值与液晶厂家生产环境密切相关，
  *           所以这些参数由厂家提供，不同厂家可能不同。也可以根据ILI9341芯片
  *           手册内容参考修改。
*/
static void ILI9341_REG_Config ( void )
{

	/*  Power control B (CFh)  */
/*  功耗控制B  */
	DEBUG_DELAY();
	LCD_WRITE_CMD(0xCF);
	LCD_WRITE_DATA(0x00);
	LCD_WRITE_DATA(0x81);
	LCD_WRITE_DATA(0x30);
	
	/*  Power on sequence control (EDh) */
/*  电源时序控制  */
	DEBUG_DELAY();
	LCD_WRITE_CMD(0xED);
	LCD_WRITE_DATA(0x64);
	LCD_WRITE_DATA(0x03);
	LCD_WRITE_DATA(0x12);
	LCD_WRITE_DATA(0x81);
	
	/*  Driver timing control A (E8h) */
/*  驱动时序控制A  */
	DEBUG_DELAY();
	LCD_WRITE_CMD(0xE8);
	LCD_WRITE_DATA(0x85);
	LCD_WRITE_DATA(0x10);
	LCD_WRITE_DATA(0x78);
	
	/*  Power control A (CBh) */
/*  功耗控制A  */
	DEBUG_DELAY();
	LCD_WRITE_CMD(0xCB);
	LCD_WRITE_DATA(0x39);
	LCD_WRITE_DATA(0x2C);
	LCD_WRITE_DATA(0x00);
	LCD_WRITE_DATA(0x34);
	LCD_WRITE_DATA(0x02);
	
	/* Pump ratio control (F7h) */
/*  泵比控制  */
	DEBUG_DELAY();
	LCD_WRITE_CMD(0xF7);
	LCD_WRITE_DATA(0x20);
        	
	/* Driver timing control B(EAh) */
/*  驱动时序控制B  */
	DEBUG_DELAY();
	LCD_WRITE_CMD(0xEA);
	LCD_WRITE_DATA(0x00);
	LCD_WRITE_DATA(0x00);
	
	/* Frame Rate Control (In Normal Mode/Full Colors) (B1h) */
 /*  帧速率控制（正常模式/全色模式）  */
	DEBUG_DELAY();
	LCD_WRITE_CMD(0xB1);
	LCD_WRITE_DATA(0x00);
        //此处RTNA[4:0]=11100,对应帧频率是68HZ，使用的是正常模式，内部时钟分频
	LCD_WRITE_DATA(0x1B);
	
	/*  Display Function Control (B6h) */
/*显示功能设置控制*/
        //按理有四个参数，为什么参考的例程只写了两个参数，其它是默认吗
	DEBUG_DELAY();
	LCD_WRITE_CMD(0xB6);
	LCD_WRITE_DATA(0x0A);
	LCD_WRITE_DATA(0xA2);
        	
	/* Power Control 1 (C0h) */
/*功耗控制1*/        
	DEBUG_DELAY();
	LCD_WRITE_CMD(0xC0);
        //VRH[5:0]：设置GVDD电平，作为VCOM电平和灰度电压的基准电压，当前设置GVDD为5.5V
	LCD_WRITE_DATA(0x35);
        		
	/* Power Control 2 (C1h) */
 /*功耗控制2*/        
	DEBUG_DELAY();
        //设置最佳的工作电压的升压因子，为了降低功耗，设置一个较小的因子
	LCD_WRITE_CMD(0xC1);
        //应该是0x01，不应该是0x11，此处貌似参考的野火的例程写的有问题
	LCD_WRITE_DATA(0x01);
	
	/* VCOM Control 1(C5h) */
/*VCOM控制1*/
	LCD_WRITE_CMD(0xC5);
	LCD_WRITE_DATA(0x45);
	LCD_WRITE_DATA(0x45);
        	
	/*  VCOM Control 2(C7h)  */
/*VCOM控制2*/        
	LCD_WRITE_CMD(0xC7);
	LCD_WRITE_DATA(0xA2);
        	
	/* Enable 3G (F2h) */
/*使能3G*/        
	LCD_WRITE_CMD(0xF2);
        //0x01为使能伽马控制，不知道野火的代码为什么0x00不启用，不启用的话后面的设置不是无效了吗
	LCD_WRITE_DATA(0x01);
        
	/* Gamma Set (26h) */
/*伽马设置*/	        
	LCD_WRITE_CMD(0x26);
        //按理没有参数，不知道官方为什么要写入数据，况且既然已经不启用伽马控制了，写什么伽马设置
        //GC[7:0]01是伽马曲线1（G2.2)
	LCD_WRITE_DATA(0x01);
	DEBUG_DELAY();
	
	/* Positive Gamma Correction(E0h) */
/*正极伽马校正*/        
	LCD_WRITE_CMD(0xE0); //Set Gamma
	LCD_WRITE_DATA(0x0F);
	LCD_WRITE_DATA(0x26);
	LCD_WRITE_DATA(0x24);
	LCD_WRITE_DATA(0x0B);
	LCD_WRITE_DATA(0x0E);
	LCD_WRITE_DATA(0x09);
	LCD_WRITE_DATA(0x54);
	LCD_WRITE_DATA(0xA8);
	LCD_WRITE_DATA(0x46);
	LCD_WRITE_DATA(0x0C);
	LCD_WRITE_DATA(0x17);
	LCD_WRITE_DATA(0x09);
	LCD_WRITE_DATA(0x0F);
	LCD_WRITE_DATA(0x07);
	LCD_WRITE_DATA(0x00);
	
	/* Negative Gamma Correction (E1h) */
/*负极伽马校正*/
	LCD_WRITE_CMD(0XE1); //Set Gamma
	LCD_WRITE_DATA(0x00);
	LCD_WRITE_DATA(0x19);
	LCD_WRITE_DATA(0x1B);
	LCD_WRITE_DATA(0x04);
	LCD_WRITE_DATA(0x10);
	LCD_WRITE_DATA(0x07);
	LCD_WRITE_DATA(0x2A);
	LCD_WRITE_DATA(0x47);
	LCD_WRITE_DATA(0x39);
	LCD_WRITE_DATA(0x03);
	LCD_WRITE_DATA(0x06);
	LCD_WRITE_DATA(0x06);
	LCD_WRITE_DATA(0x30);
	LCD_WRITE_DATA(0x38);
	LCD_WRITE_DATA(0x0F);
	
	/* memory access control set（36h） */
/*存储器访问控制*/
	DEBUG_DELAY();
	LCD_WRITE_CMD(0x36); 	        
        //野火官方默认为0xC8会导致整个屏幕的文字反转
        //其它默认即可，关键是其中的BGR参数，默认是BGR模式，需要当心（难怪我之前的颜色不太正常）
	LCD_WRITE_DATA(0x08);    
	DEBUG_DELAY();
	
	/* column address control set （2Ah）*/
/*列地址设置*/
	LCD_WRITE_CMD(0x2A); 
	LCD_WRITE_DATA(0x00);
	LCD_WRITE_DATA(0x00);
	LCD_WRITE_DATA(0x00);
	LCD_WRITE_DATA(0xEF);
	
	/* page address control set（2Bh) */
/*行地址设置*/
	DEBUG_DELAY();
	LCD_WRITE_CMD(0x2B); 
	LCD_WRITE_DATA(0x00);
	LCD_WRITE_DATA(0x00);
	LCD_WRITE_DATA(0x01);
	LCD_WRITE_DATA(0x3F);
	
	/*  Pixel Format Set (3Ah)  */
/*像素格式设置*/
	DEBUG_DELAY();
	LCD_WRITE_CMD(0x3a); 
        //设定16BPP
	LCD_WRITE_DATA(0x55);
	
	/* Sleep Out (11h)  */
/*退出睡眠模式*/  
        //一个小疑问，为什么要退出睡眠模式呢，难道插电默认就是睡眠状态吗，还是只是为了保险起见，才这么写的呢？
        //实际测试结果，注释掉这句确实无法点亮屏幕
	LCD_WRITE_CMD(0x11);	
        //退出睡眠模式后，需要等待120ms
	Lcd_Delay(0xAFFf<<2);
	DEBUG_DELAY();
	
	/* Display ON (29h) */
/*开显示*/
        //28h是关显示，29h是开显示
	LCD_WRITE_CMD(0x29); 
        	//初始化完成以后,提速
	if(lcd_id==0X9341)//如果是9341IC,则设置WR时序为最快
	{
		//重新配置写时序控制寄存器的时序
        //地址建立时间(ADDSET)清零
		FSMC_Bank1E->BWTR[0]&=~(0XF<<0);
        //数据保存时间清零
		FSMC_Bank1E->BWTR[0]&=~(0XF<<8);
        //地址建立时间(ADDSET)为4个HCLK =21ns
		FSMC_Bank1E->BWTR[0]|=4<<0;
        //数据保存时间(DATAST)为5.2ns*4个HCLK=21ns
		FSMC_Bank1E->BWTR[0]|=4<<8;
	} 
}