touch.c

基于三星44B0的FAT16文件系统 测试版

#include "..\Target\44b.h"
#include "..\Target\44blib.h"

#define TOUCH_MSR_Y   0x9c//读Y轴坐标命令（参考表14－2的位定义说明）
#define TOUCH_MSR_X   0xdc//读X轴坐标命令

typedef struct {
	int  Pressed;
	int  x;
	int  y;
}TOUCHSTATE;

TOUCHSTATE _State;

int ReadTouch(unsigned char command)//TouchStruct *TouchState)
{
	unsigned char temp,i,ack;
	
	ack=0;    
    ///PG7<-PENIRQ,PG6<-BUSY,PG5<-DOUT,PG4->CS,PG3->DCLK,PG2->DIN
    //PC14<-DCLK, PC11<-DOUT, PC10<-BUSY, PC9<-DIN, PC8<-CS, EXINT7<-PENIRQ	
	
	rPDATC &=0xbeff;//rPDATG &=0xe7;	//clr cs;clr dclk
	temp=0x80;
	for(i=0;i<8;i++)
	{
		if(command&temp)//mov din,c
			rPDATC |=0x0200;//rPDATG|=0x04;//setb din  ,PC9=1 //setb din
		else
			rPDATC &=0xfdff;//rPDATG &=0xfb;//clr  din	,PC9=0 //clr  din
		rPDATC |=0x4000;//rPDATG |=0x08;	//setb dclk            //setb dclk
		Delay(3);
		rPDATC &=0xbfff;//rPDATG &=0xf7;	//clr dclk ,PC14=0     //clr dclk
		Delay(3);
		temp=temp>>1;
	}
	temp=(unsigned char)((rPDATC&0x0400)>>8);
	while(temp==0)		//while((temp=(rPDATG&0x40))==0); 	// 当busy(pc10)=0 循环	
		temp=(unsigned char)((rPDATC&0x0400)>>8);
	rPDATC &=0xf7ff;//rPDATG &=0xdf;	//clr dout  ,PC11=0  //clr din
    	
	rPDATC |=0x4000;//rPDATG |=0x08;	//setb dclk ,PC14=1		//setb dclk
	Delay(3);
	rPDATC &=0xbfff;//rPDATG &=0xf7;	//clr dclk  ,PC14=0						//clr dclk
	Delay(3);
	for(i=0;i<7;i++)
	{
		rPDATC |=0x4000;//rPDATG |=0x08;	//setb dclk ,PC14=1			//setb dclk
		temp=(unsigned char)((rPDATC&0x0800)>>8);
		if(temp)		//if(temp=rPDATG&0x20)		//当dout(pc11)=1	
			ack++;
		ack=ack<<1;
		Delay(3);
		rPDATC &=0xbfff;//rPDATG &=0xf7;	//clr dclk ,PC14=0		//clr dclk
		Delay(3);
	}
	rPDATC |=0x4000;	// rPDATG |=0x08;//setb dclk ,PC14=1
	temp=(unsigned char)((rPDATC&0x0800)>>8);
	if(temp)		//if(temp=rPDATG&0x20)
		ack++;	
	Delay(3);	
	rPDATC &=0xbfff;	//rPDATG&=0xf7;//clr dclk
	rPDATC |=0x0100;	//rPDATG|=0x10;//setb cs
        
	return ack;
}

void Test_Touch(void)
{
   	unsigned int save_C,save_G,save_PC,save_PG;
   	
   	save_C=rPCONC;
	save_G=rPCONG;
    save_PC=rPUPC;
    save_PG=rPUPG;   
	
	Uart_Printf("[Touch Screen Panel test!\n");
	Uart_Printf(" 在计算机上,按任意键退出测试...\n");
	Uart_Printf("点击触摸屏，显示点击的位置坐标。\n");
		
	_State.Pressed=0;
	_State.x=0;
	_State.y=0;
	
	//rPCONG=0x015f;//init. I/O
	//rPUPG &=0x80;
	rPCONC =0x1f05ff55;		//PC14,PC8,PC9为输出，PC10,PC11为输入
	rPUPC  =0x00ff;   
	rPCONG =0x00ff;			//PG7 设为输入
	rPUPG  =0x80;				//PG7 the pull up resistor is disabled

	    
	ReadTouch(0xdc);
   
	while(!Uart_GetKey())
	{
		if(((rPDATG&0x80)==0)&&(_State.Pressed==0)) //PENIRQ电平为低  PG7=0	//PENIRQ电平为低
		{
            _State.Pressed=1;			//说明已经按下
		    _State.x=ReadTouch(TOUCH_MSR_X);
		    _State.y=ReadTouch(TOUCH_MSR_Y);
		    Uart_Printf("\nTouch at the point ( %4d, %4d )",_State.x,_State.y);
		}
		else if(((rPDATG&0x80)!=0)&&(_State.Pressed==1))
			_State.Pressed=0;
		
		Delay(100);
	}
	rPCONC=save_C;
	rPCONG=save_G;
	rPUPC=save_PC;
	rPUPG=save_PG;

}