void Test_Touchpanel(void)
{
   
    rADCDLY=50000;  //ADC启动延时 (1/3.6864M)*50000=13.56ms
    
    /*设置AD转频率*/
    preScaler = ADC_FREQ;
    preScaler = 50000000/ADC_FREQ - 1; //PCLK=50M
    rADCCON = (1<<14)|(preScaler<<6); //使能分频,  分频值PRSCVL=19
                                                          //转换频率=50MHz/(19+1)=2.5HMz
                                                          //转换时间=1/(2.5MHz/5)=2×10^(-6)秒 
                                                          //一秒钟转换5×10^5次
    /*设置触摸屏为等待中断模式，等待触摸笔被按下*/
    rADCTSC=0xd3;  //Wfait,XP_PU,XP_Dis,XM_Dis,YP_Dis,YM_En
                              //11010011  来自2440手册
    
    /*clear irq*/
    rSRCPND = 0x80000000;     //清除挂起状态
    rINTPND = 0x80000000;
    ClearSubPending(BIT_SUB_TC);  

    pISR_ADC = (U32)AdcTsAuto;   //中断服务函数

    /*enable INT_TC irq*/ 
    rINTMSK = 0x7fffffff;            //打开屏蔽
    EnableSubIrq(BIT_SUB_TC);
}

static void __irq AdcTsAuto(void)  //中断服务函数
{
    U32 saveAdcdly;
    /****************stylus down************************/
    /*检测子中断源，判断是否是INT_TC中断，且触摸笔按下*/
    if(rSUBSRCPND & (BIT_SUB_TC))
    {
if( !(rADCDAT0&0x8000))  //是否落下状态
   Uart_Printf("\nStylus down\n");
else 
            Uart_Printf("\nStylus up\n"); 
    }

    saveAdcdly=rADCDLY;
    rADCDLY=40000;    //ADC启动延迟    (1/50M)*40000=0.8ms

      rADCCON|=0x1;                   //开始ADC
    while(rADCCON & 0x1);      //转换是否开始  
  while(!(rADCCON & 0x8000));  //转换是否结束
while(!(rSRCPND & 0x80000000));  //检测是否产生INT_ADC中断

    /*获取X,Y坐标*/
    xdata=http://www.mamicode.com/(rADCDAT0&0x3ff);   //[9：0]存储X值
    ydata=http://www.mamicode.com/(rADCDAT1&0x3ff);   //[9：0]存储Y值
 Uart_Printf("count=%03d  XP=%04d, YP=%04d\n", count++, xdata, ydata);    
     
     /*3个PND         2个MSK*/ 
    ClearSubPending(BIT_SUB_TC);
    rSRCPND = 0x80000000;
    rINTPND = 0x80000000;  
    EnableSubIrq(BIT_SUB_TC);
    rINTMSK = 0x7fffffff;
    /****************stylus down************************/