tchscr.c

arm3000触摸屏实验源代码

#include "44b.h"
#include "LCDConf.H"
#include "tchScr.h"
#include "maro.h"

#define ADS7843_CMD_X	(ADS7843_CTRL_START|ADS7843_GET_X|ADS7843_CTRL_12MODE|ADS7843_CTRL_DFR|ADS7843_CTRL_ENPWD)
//采样x轴电压值，数据为12位，参考电压输入模式为差分模式，允许省电模式
#define ADS7843_CMD_Y	(ADS7843_CTRL_START|ADS7843_GET_Y|ADS7843_CTRL_12MODE|ADS7843_CTRL_DFR|ADS7843_CTRL_ENPWD)

int TchScr_Xmax=1876,TchScr_Xmin=269,
	TchScr_Ymax=229,TchScr_Ymin=1725;//触摸屏返回电压值范围

void TchScr_GetScrXY(int *x, int *y, U8 bCal)
{//获得触摸点坐标
	unsigned int temp;

	rPDATF&=~ADS7843_PIN_CS;//打开ADS7843

	SendSIOData(ADS7843_CMD_X);//发送读取x电压值控制字
	SendSIOData(0);//等待8个时钟节拍，因为完成一转换需要16个时钟
	temp=ReadSIOData();//读取采样值高8位
	SendSIOData(ADS7843_CMD_X);
	temp<<=8;
	temp|=ReadSIOData();//读取低8位并与以前高8位组成16位数据
	*x=(temp>>4);//去掉低4位，保留12位有效数据

	SendSIOData(0);
	temp=ReadSIOData();
	SendSIOData(ADS7843_CMD_X);
	temp<<=8;
	temp|=ReadSIOData();
	*x+=(temp>>4);

	SendSIOData(0);
	temp=ReadSIOData();
	SendSIOData(ADS7843_CMD_X);
	temp<<=8;
	temp|=ReadSIOData();
	*x+=(temp>>4);

	SendSIOData(0);
	temp=ReadSIOData();
	SendSIOData(ADS7843_CMD_Y);
	temp<<=8;
	temp|=ReadSIOData();
	*x+=(temp>>4);
	*x>>=2;		//采样4次取平均值
	//读取y电压值
	SendSIOData(0);
	temp=ReadSIOData();
	SendSIOData(ADS7843_CMD_Y);
	temp<<=8;
	temp|=ReadSIOData();
	*y=(temp>>4);

	SendSIOData(0);
	temp=ReadSIOData();
	SendSIOData(ADS7843_CMD_Y);
	temp<<=8;
	temp|=ReadSIOData();
	*y+=(temp>>4);
	
	SendSIOData(0);
	temp=ReadSIOData();
	SendSIOData(ADS7843_CMD_Y);
	temp<<=8;
	temp|=ReadSIOData();
	*y+=(temp>>4);

	SendSIOData(0);
	temp=ReadSIOData();
	SendSIOData(0);
	temp<<=8;
	temp|=ReadSIOData();
	*y+=(temp>>4);
	*y>>=2;		

	rPDATF|=ADS7843_PIN_CS;//关闭ADS7843

	if(bCal){//对采样结果进行转换
		*x=(*x-TchScr_Xmin)*LCD_XSIZE/(TchScr_Xmax-TchScr_Xmin);
		*y=(*y-TchScr_Ymin)*LCD_YSIZE/(TchScr_Ymax-TchScr_Ymin);
	}
}
U32 TchScr_GetOSXY(int *x, int *y)
{//获得触摸点坐标并返回触摸动作
	static U32 mode=0;
	static int oldx,oldy;
	int i,j;
	for(;;){
	if((mode!=TCHSCR_ACTION_DOWN) && (mode!=TCHSCR_ACTION_MOVE)){
			if(!TCHSCR_IsPenNotDown){//有触摸动作
				TchScr_GetScrXY(x, y,TRUE);//得到触摸点坐标
				for(i=0;i<40;i++){
					if(TCHSCR_IsPenNotDown)//抬起
						break;
					Delay(100);
				}
				if(i<40){	//在规定的双击时间之内抬起，检测是不是及时按下
					for(i=0;i<60;i++){
						if(!TCHSCR_IsPenNotDown){
                            if (i<10) {i=60;break;}//如果单击后很短时间内按下，不视为双击
                                
							mode=TCHSCR_ACTION_DBCLICK;
							for(j=0;j<40;j++) Delay(100);//检测到双击后延时，防止拖尾
                            break;
						}
						
                    Delay(100);
					}
					if(i==60)		//没有在规定的时间内按下
						mode=TCHSCR_ACTION_CLICK;
				}
				else{	//没有在规定的时间内抬起
					mode=TCHSCR_ACTION_DOWN;
				}
			  	
              break;
			}
		}
		else{
			if(TCHSCR_IsPenNotDown){	//抬起
				mode=TCHSCR_ACTION_UP;
				*x=oldx;
				*y=oldy;
				return mode;
			}
			else{
				TchScr_GetScrXY(x, y,TRUE);
				if(ABS(oldx-*x)>4 ||ABS( oldy-*y)>4){//有移动动作
					mode=TCHSCR_ACTION_MOVE;
					break;
				}
			}
		}
		Delay(50);
	}



	oldx=*x;
	oldy=*y;
	return mode;
}

void TchScr_Test()
{
	U32 mode;
	int x,y;
	
//	Uart_Printf("\nplease touch the screen\n");

	for(;;){
		mode=TchScr_GetOSXY(&x, &y);
		switch(mode){
		case TCHSCR_ACTION_CLICK:
			Uart_Printf("Action=click:x=%d,\ty=%d\n",x,y);
			break;
		case TCHSCR_ACTION_DBCLICK:
			Uart_Printf("Action=double click:x=%d,\ty=%d\n",x,y);
			break;
		case TCHSCR_ACTION_DOWN:
			Uart_Printf("Action=down:x=%d,\ty=%d\n",x,y);
			break;
		case TCHSCR_ACTION_UP:
			Uart_Printf("Action=up:x=%d,\ty=%d\n",x,y);
			break;
		case TCHSCR_ACTION_MOVE:
			Uart_Printf("Action=move:x=%d,\ty=%d\n",x,y);
			break;
		}
		Delay(1000);
	}
}