tft_driver.c

用OV7720制作摄像头的详细电路原理图

//====================================================================================
//文 件 名：TFT_Driver.c
//功能描述: TFT驱动程序(底层驱动)
//维护记录: 2007年1月17日
//====================================================================================
#include "TFT_Driver.h"

STR_TFT_SETTING TFT_Settings;

//=============================================================
//语法格式：	void TFT_SetBufAddr(unsigned short *Buff1, unsigned short *Buff2, unsigned short *Buff3)
//实现功能：	更新TFT缓冲地址
//参数：		Buff1	-	缓冲区1首地址
//				Buff2	-	缓冲区2首地址
//				Buff3	-	缓冲区3首地址
//返回值：		无
//=============================================================
void TFT_SetBufAddr(unsigned short *Buff0, unsigned short *Buff1, unsigned short *Buff2)
{
	TFT_Settings.Buf[0] = (unsigned short *)(*P_LCD_BUFFER_SA1 = (unsigned int)Buff0);
	TFT_Settings.Buf[1] = (unsigned short *)(*P_LCD_BUFFER_SA2 = (unsigned int)Buff1);
	TFT_Settings.Buf[2] = (unsigned short *)(*P_LCD_BUFFER_SA3 = (unsigned int)Buff2);
	TFT_Settings.WorkBuf = TFT_Settings.DispBuf = *P_LCD_BUFFER_SEL = 0;
}

//=============================================================
//语法格式：	void TFT_SetBufFmt(unsigned int FMT1, unsigned int FMT2)
//实现功能：	更新TFT缓冲区数据格式设置
//参数：		FMT1	-	缓冲区格式1
//				FMT2	-	缓冲区格式2
//返回值：		无
//=============================================================
void TFT_SetBufFmt(unsigned int FMT1, unsigned int FMT2)
{
	TFT_Settings.Buf_Format1 = *P_TFT_FRAME_FMT1 = FMT1;
	TFT_Settings.Buf_Format2 = *P_TFT_FRAME_FMT2 = FMT2;
}

//=============================================================
//语法格式：	unsigned short *TFT_SelDispBuf(unsigned char Buf_Cursor);
//实现功能：	选择一个缓冲区作为显示缓冲区
//参数：		Buf_Cursor - 作为显示输出的缓冲区序号(0~2)
//							 大于2的参数可以获取当前使用的缓冲区首地址
//返回值：		作为显示输出的缓冲区起始地址
//=============================================================
unsigned short *TFT_SelDispBuf(unsigned char Buf_Cursor)
{
	switch(Buf_Cursor)
	{
		case 0:
			TFT_Settings.DispBuf = *P_LCD_BUFFER_SEL = 0;
			break;
		case 1:
			TFT_Settings.DispBuf = *P_LCD_BUFFER_SEL = 1;
			break;
		case 2:
			TFT_Settings.DispBuf = *P_LCD_BUFFER_SEL = 2;
			break;
		default:
			return TFT_Settings.Buf[TFT_Settings.DispBuf];
			break;		
	}
	return TFT_Settings.Buf[Buf_Cursor];
}

//=============================================================
//语法格式：	unsigned short *TFT_SelWorkBuf(unsigned char Buf_Cursor);
//实现功能：	选择一个缓冲区作为工作缓冲区(TFT_API中的函数都是对工作缓冲区操作的)
//参数：		Buf_Cursor - 作为工作缓冲区的序号(0~2)
//							 大于2的参数可以获取当前使用的缓冲区首地址
//返回值：		作为工作缓冲区的起始地址
//=============================================================
unsigned short *TFT_SelWorkBuf(unsigned char Buf_Cursor)
{
	switch(Buf_Cursor)
	{
		case 0:
			TFT_Settings.WorkBuf = 0;
			break;
		case 1:
			TFT_Settings.WorkBuf = 1;
			break;
		case 2:
			TFT_Settings.WorkBuf = 2;
			break;
		default:
			return TFT_Settings.Buf[TFT_Settings.WorkBuf];
			break;		
	}
	return TFT_Settings.Buf[Buf_Cursor];
}

void TFT_SetWorkBufSize(short WorkBufWidth, short WorkBufHeight)
{
	TFT_Settings.WorkBufWidth = (WorkBufWidth >= TFT_WIDTH ? WorkBufWidth : TFT_WIDTH);
	TFT_Settings.WorkBufHeight = (WorkBufHeight >= TFT_HEIGHT ? WorkBufHeight : TFT_HEIGHT);
	TFT_Settings.RowStart = *P_TFT_ROW_START = 0;
	TFT_Settings.ColStart = *P_TFT_COL_START = 0;
	*P_TFT_DUMMY_WIDTH = TFT_Settings.WorkBufWidth - TFT_WIDTH;
}

void TFT_GetWorkBufSize(short *WorkBufWidth, short *WorkBufHeight)
{
	*WorkBufWidth = TFT_Settings.WorkBufWidth;
	*WorkBufHeight = TFT_Settings.WorkBufHeight;
}

void TFT_SetDispOffset(unsigned short OffX, unsigned short OffY)
{
	if((OffX + TFT_WIDTH) > TFT_Settings.WorkBufWidth)
		OffX = TFT_Settings.WorkBufWidth - TFT_WIDTH;
	TFT_Settings.ColStart = *P_TFT_COL_START = OffX;
	TFT_Settings.RowStart = *P_TFT_ROW_START = OffY;
	*P_TFT_DUMMY_WIDTH = TFT_Settings.WorkBufWidth - OffX - TFT_WIDTH;
}

//=============================================================
//语法格式：	void TFT_InitHardware(void);
//实现功能：	初始化TFT相关硬件寄存器
//参数：		无
//返回值：		无
//=============================================================
extern void *memset(void *s, int c, unsigned int n);
void TFT_InitHardware(void)
{
	*P_BUFCTRL_CLK_CONF = 0x03;
 	*P_LCD_INTERFACE_SEL |= TFT_INTERFACE;					// 管脚复用，选择TFT_AUO模式
	*P_LCD_CLK_CONF = C_LCD_RST_DIS | C_LCD_CLK_EN;			// LCD模式时钟使能

	// 设置TFT-LCD数据模式
	*P_TFT_DATA_SEQ = TFT_DATA_SEQ;							// TFT-LCD输出数据格式
	*P_TFT_DATA_FMT = TFT_DATA_FMT;							// TFT-LCD管脚输出数据格式

	// 设置TFT-LCD的行信号
	*P_TFT_HOR_ACT = TFT_HOR_ACT;
	*P_TFT_HOR_FRONT = TFT_HOR_FRONT;
	*P_TFT_HOR_BACK = TFT_HOR_BACK;
	*P_TFT_HOR_SYNC = TFT_HOR_SYNC;
	
	// 设置TFT-LCD的场信号
	*P_TFT_VER_ACT = TFT_VER_ACT;
	*P_TFT_VER_FRONT = TFT_VER_FRONT;
	*P_TFT_VER_BACK = TFT_VER_BACK;
	*P_TFT_VER_SYNC = TFT_VER_SYNC;
	// 设置TFT-LCD显示的起始位置
	*P_TFT_COL_WIDTH = TFT_WIDTH;

	TFT_SetWorkBufSize(TFT_WINDOW_WIDTH, TFT_WINDOW_HEIGHT);

	TFT_SetBufFmt(TFT_FRAME_FMT1, TFT_FRAME_FMT2);
	TFT_SetBufAddr((unsigned short*)TFT_BUFFER0_SA, (unsigned short*)TFT_BUFFER1_SA, (unsigned short*)TFT_BUFFER2_SA);

	memset(TFT_Settings.Buf[0], 0,
			TFT_Settings.WorkBufWidth * TFT_Settings.WorkBufHeight * 2);
	memset(TFT_Settings.Buf[1], 0,
			TFT_Settings.WorkBufWidth * TFT_Settings.WorkBufHeight * 2);
	memset(TFT_Settings.Buf[2], 0,
			TFT_Settings.WorkBufWidth * TFT_Settings.WorkBufHeight * 2);

	*P_BUFCTRL_CLK_CONF = 0x03;
	// 设置TFT-LCD的控制寄存器
	*P_TFT_INT_STATUS = ~C_TFT_INT_EN;			// 中断不使能
	// 使能TFT模块，图像不放大，选择6.75MHz时钟
	*P_TFT_MODE_CTRL = C_TFT_CTRL_EN | TFT_CLK_SET;
}