lcd_draw.c

NXP ARM处理器240*320液晶驱动程序（IAR开发环境）

#include "data_types.h"
#include "lpc2478.h"

/*-----------------------------------------------------------------------------
 *  320 x 240 TFT LCD单个象素的显示数据输出
 */
void PutPixel(INT32S x,INT32S y,INT16S c)
{
    if(x < 320 && y < 240)
      *(volatile INT16U *)(SDRAM_BASE + 2*(x + 320 * y)) = c;
}

/**************************************************************
320×240 16Bpp TFT LCD全屏填充特定颜色单元或清屏
**************************************************************/

void Lcd_ClearScr(INT32S x,INT32S y,INT32S c)
{

        INT32S i = 0;
        while (i < x * y)
        {
            *(volatile INT16U *)(SDRAM_BASE + i * 2) = c;
            i += 1;
        }
}
/**************************************************************
LCD屏幕显示垂直翻转
// LCD display is flipped vertically
// But, think the algorithm by mathematics point.
//   3I2
//   4 I 1
//  --+--   <-8 octants  mathematical cordinate
//   5 I 8
//   6I7
**************************************************************/
void Glib_Line(INT32S x1,INT32S y1,INT32S x2,INT32S y2,INT32S color)
{
	INT32S dx,dy,e;
	dx=x2-x1;
	dy=y2-y1;

	if(dx>=0)
	{
		if(dy >= 0) // dy>=0
		{
			if(dx>=dy) // 1/8 octant
			{
				e=dy-dx/2;
				while(x1<=x2)
				{
					PutPixel(x1,y1,color);
					if(e>0){y1+=1;e-=dx;}	
					x1+=1;
					e+=dy;
				}
			}
			else		// 2/8 octant
			{
				e=dx-dy/2;
				while(y1<=y2)
				{
					PutPixel(x1,y1,color);
					if(e>0){x1+=1;e-=dy;}	
					y1+=1;
					e+=dx;
				}
			}
		}
		else		   // dy<0
		{
			dy=-dy;   // dy=abs(dy)

			if(dx>=dy) // 8/8 octant
			{
				e=dy-dx/2;
				while(x1<=x2)
				{
					PutPixel(x1,y1,color);
					if(e>0){y1-=1;e-=dx;}	
					x1+=1;
					e+=dy;
				}
			}
			else		// 7/8 octant
			{
				e=dx-dy/2;
				while(y1>=y2)
				{
					PutPixel(x1,y1,color);
					if(e>0){x1+=1;e-=dy;}	
					y1-=1;
					e+=dx;
				}
			}
		}	
	}
	else //dx<0
	{
		dx=-dx;		//dx=abs(dx)
		if(dy >= 0) // dy>=0
		{
			if(dx>=dy) // 4/8 octant
			{
				e=dy-dx/2;
				while(x1>=x2)
				{
					PutPixel(x1,y1,color);
					if(e>0){y1+=1;e-=dx;}	
					x1-=1;
					e+=dy;
				}
			}
			else		// 3/8 octant
			{
				e=dx-dy/2;
				while(y1<=y2)
				{
					PutPixel(x1,y1,color);
					if(e>0){x1-=1;e-=dy;}	
					y1+=1;
					e+=dx;
				}
			}
		}
		else		   // dy<0
		{
			dy=-dy;   // dy=abs(dy)

			if(dx>=dy) // 5/8 octant
			{
				e=dy-dx/2;
				while(x1>=x2)
				{
					PutPixel(x1,y1,color);
					if(e>0){y1-=1;e-=dx;}	
					x1-=1;
					e+=dy;
				}
			}
			else		// 6/8 octant
			{
				e=dx-dy/2;
				while(y1>=y2)
				{
					PutPixel(x1,y1,color);
					if(e>0){x1-=1;e-=dy;}	
					y1-=1;
					e+=dx;
				}
			}
		}	
	}
}

/**************************************************************
在LCD屏幕上画一个矩形
**************************************************************/
void Glib_Rectangle(INT32S x1,INT32S y1,INT32S x2,INT32S y2,INT32S color)
{
    Glib_Line(x1,y1,x2,y1,color);
    Glib_Line(x2,y1,x2,y2,color);
    Glib_Line(x1,y2,x2,y2,color);
    Glib_Line(x1,y1,x1,y2,color);
}

/**************************************************************
在LCD屏幕上用颜色填充一个矩形
**************************************************************/
void Glib_FilledRectangle(INT32S x1,INT32S y1,INT32S x2,INT32S y2,INT32S color)
{
    INT32S i;

    for(i=y1;i<=y2;i++)
	Glib_Line(x1,i,x2,i,color);
}