[国嵌攻略][061][2440LCD驱动设计]

/********************************************************************
*名称:lcd
*作者:D
*时间:2015.11.18
*功能:液晶显示屏驱动
********************************************************************/

/********************************************************************
*							 宏定义
********************************************************************/
#define GPCCON ( (*(volatile unsigned long *)0x56000020) )   //GPC组控制寄存器
#define GPDCON ( (*(volatile unsigned long *)0x56000030) )   //GPD组控制寄存器
#define GPGCON ( (*(volatile unsigned long *)0x56000060) )   //GPG组控制寄存器

#define LCDCON1 ( (*(volatile unsigned long *)0X4D000000) )   //LCD控制1寄存器
#define LCDCON2 ( (*(volatile unsigned long *)0X4D000004) )   //LCD控制2寄存器
#define LCDCON3 ( (*(volatile unsigned long *)0X4D000008) )   //LCD控制3寄存器
#define LCDCON4 ( (*(volatile unsigned long *)0X4D00000C) )   //LCD控制4寄存器
#define LCDCON5 ( (*(volatile unsigned long *)0X4D000010) )   //LCD控制5寄存器

#define LCDSADDR1 ( (*(volatile unsigned long *)0X4D000014) )   //帧缓冲起始地址1寄存器
#define LCDSADDR2 ( (*(volatile unsigned long *)0X4D000018) )   //帧缓冲起始地址2寄存器
#define LCDSADDR3 ( (*(volatile unsigned long *)0X4D00001C) )   //帧缓冲起始地址3寄存器

#define TPAL ( (*(volatile unsigned long *)0X4D000050) )   //临时调色板寄存器

#define HIGHT 320   //屏高，vertical
#define WIDTH 240   //屏宽，horizontal

//LCDCON1配置
#define CLKVAL 7      //CLKVAL[17:8]:4 VCLK=HCLK/((CLKVAL+1)*2) VCLK=6.0-7.1MHz HCLK=100MHz
#define PNRMODE 0x3   //PNRMODE[6:5]:11 TFT LCD
#define BPPMODE 0xC   //BPPMODE[4:1]:1100 16 bpp for TFT
#define ENVID_ON 1    //ENVID[0]:0 打开LCD输出
#define ENVID_OFF 0   //ENVID[0]:0 关闭LCD输出

//LCDCON2配置
#define VBPD 1              //VBPD[31:24]:2-1 垂直后肩
#define LINEVAL (HIGHT-1)   //LINEVAL[23:14]:240-1 屏高，对应于Vertical Display Active
#define VFPD 1              //VFPD[13:6]:2-1 垂直前肩
#define VSPW 12             //VSPW[5:0]:13-1 垂直脉宽，对应于Vertical Blank Time

//LCDCON3配置
#define HBPD 1            //HBPD[25:19]:2-1 水平后肩
#define HOZVAL (WIDTH-1)  //HOZVAL[18:8]:240-1 屏宽，对应于Horizontal Display Active
#define HFPD 1            //HFPD[7:0]:2-1 水平前肩

//LCDCON4配置
#define HSPW 79   //HSPW[7:0]:80-1 水平脉宽，对应于Horizontal Blank Time

//LCDCON5配置
#define FRM565 1      //FRM565[11]:1 5:6:5 Format
#define INVVLINE 1    //INVVLINE[9]:1 HSYNC Inverted
#define INVVFRAME 1   //INVVFRAME[8]:1 VSYNC Inverted
#define PWREN_ON 1    //PWREN[3]:1 打开LCD电源
#define PWREN_OFF 1   //PWREN[3]:0 关闭LCD电源
#define HWSWP 1       //HWSWP[0]:1 Swap Enable

//TPAL配置
#define TPALEN_ON 1        //TPALEN[24]:1 Enable
#define TPALEN_OFF 0       //TPALEN[24]:0 Disable
#define TPALVAL 0xFF0000   //TPALVAL[23:16]:RED, TPALVAL[15:8], GREEN,TPALVAL[7:0]:BLUE

/********************************************************************
*							 全局变量
********************************************************************/
unsigned short LCDBUFFER[HIGHT][WIDTH];   //帧缓冲320*240*2字节

/********************************************************************
*名称:init_lcd
*功能:初始化液晶显示屏
*********************************************************************/
void init_lcd(){
	unsigned long LCDBANK;     //LCDSADDR1[29:21] 帧缓冲起始地址30:22位
	unsigned long LCDBASEU;    //LCDSADDR2[20:0]  帧缓冲起始地址21:1位
	unsigned long LCDBASEL;    //LCDSADDR2[20:0]  帧缓冲结束地址21:1位
	unsigned long OFFSIZE;     //LCDSADDR3[21:11] 每行偏移的半字
	unsigned long PAGEWIDTH;   //LCDSADDR3[10:0]  每行字节的半字

	//初始化引脚
	GPCCON = 0xAAAAAAAA;   //GPC15-GPC8:10 VD[7-0], GPC7:10 LCD_LPCREVB, GPC6:10 LCD_LPCREV, GPC5:10 LCD_LPCOE, GPC4:10 VM, GPC3:10 VFRAME, GPC2:10 VLINE, GPC1:10 VCLK, GPC0:10 LEND
	GPDCON = 0xAAAAAAAA;   //GPD15-GPD0:10 VD[23-8]
	GPGCON |= (0x3<<8);    //GPG4[9:8]:11 LCD_PWRDN
	
	//初始化时序
	LCDCON1 = (CLKVAL<<8)|(PNRMODE<<5)|(BPPMODE<<1)|(ENVID_OFF<<0);
	LCDCON2 = (VBPD<<24)|(LINEVAL<<14)|(VFPD<<6)|(VSPW<<0);
	LCDCON3 = (HBPD<<19)|(HOZVAL<<8)|(HFPD<<0);
	LCDCON4 = (HSPW<<0);
	LCDCON5 = (FRM565<<11)|(INVVLINE<<9)|(INVVFRAME<<8)|(TPALEN_OFF<<3)|(HWSWP<<0);
	
	//初始化帧缓冲
	LCDBANK = ((unsigned long)LCDBUFFER>>22)&0x1FF;      //取出帧缓冲地址的30:22位
	LCDBASEU = ((unsigned long)LCDBUFFER>>1)&0x1FFFFF;   //取出帧缓冲起始地址的21:1位
	LCDSADDR1 = (LCDBANK<<21)|(LCDBASEU<<0);
	
	LCDBASEL = ( (((unsigned long)LCDBUFFER + WIDTH*HIGHT*2)>>1) )&0x1FFFFF;   //取出帧缓冲结束地址的21:1位
	LCDSADDR2 = (LCDBASEL<<0);
	
	OFFSIZE = 0;
	PAGEWIDTH = WIDTH*2/2;   //页宽一个字是2个字节，所以乘以2，又因为该值是半字，所以除以2
	LCDSADDR3 = (OFFSIZE<<11)|(PAGEWIDTH<<0);
	
	//关闭临时调色板
	TPAL = (TPALEN_OFF<<24);
	
	//打开液晶显示屏
	LCDCON5 |= (PWREN_ON<<3);
	LCDCON1 |= (ENVID_ON<<0);
}

/********************************************************************
*名称:clear_lcd
*参数:
*	none
*返回:
*	none
*功能:清屏
*********************************************************************/
void clear_lcd(){
	//打开临时调色板
	TPAL = (TPALEN_ON<<24)|(TPALVAL<<0);
}