ARM板开发触摸屏程序，出现飘屏！急求解决办法！

mygod0218 2010-04-12 11:24:07

我用ARM板测试一个触摸屏程序，偶尔出现飘屏！
源码如下：



#include "def1.h"

#include "2440addr.h"

#include "2440lib.h"

#include "config.h"





#define REQCNT 30

#define ADCPRS 9	//YH 0627

#define LOOP 1



void  AdcTsAuto(void);



int TouchPanelCnt=0;  // 触摸屏次数的记录



struct TouchLocation

{

	volatile int x;

	volatile int y;

}TPxyLocation = {0,0};

volatile int test_x;

	volatile int test_y;

 INT8U ts_status;//触摸屏的状态（校准还是测试）

//static U16 ts_lefttop_x,ts_lefttop_y,ts_rightbot_x,ts_rightbot_y,ts_leftbot_x,

		   //ts_leftbot_y,ts_righttop_x,ts_righttop_y;

 struct TouchLocation TestPoint[8] = {0};



extern void AdcTsAuto_Handler(void);

extern OS_EVENT  *TP_m_box;

//extern OS_EVENT  *Cal_m_box;           

//extern OS_EVENT  *Lag_m_box; 



//unsigned int buf[3][2];

U16 Ptx[6],Pty[6],tmp[6] = {0,0,0,0,0,0};



//U8 index = 0;

void AdcTsAuto(void)

{

	 int i;

	U32 saveAdcdly;



    if(rADCDAT0&0x8000)

    {

		//Uart_Printf("\nStylus Up!!\n");

		rADCTSC&=0xff;	// Set stylus down interrupt bit

    }

    //else 

    	

	//	Uart_Printf("\nStylus Down!!\n");



	rADCTSC=(1<<3)|(1<<2);         //Pull-up disable, Seq. X,Y postion measure.

	saveAdcdly=rADCDLY;

	rADCDLY=40000;                 //Normal conversion mode delay about (1/50M)*40000=0.8ms



	rADCCON|=0x1;                   //start ADC





   

   for(i=0;i<5;i++)

    {

       // rADCTSC  = (1<<7)|(1<<6)|(0<<5)|(1<<4)|(1<<3)|(1<<2)|(0);   

       

          rADCTSC=(1<<3)|(1<<2);         //Pull-up disable, Seq. X,Y postion measure.

	saveAdcdly=rADCDLY;

	rADCDLY=40000;                 //Normal conversion mode delay about (1/50M)*40000=0.8ms

      

        rADCCON |= 0x1;             //Start Auto conversion

        while(rADCCON & 0x1);       //Check if Enable_start is low

        while(!(0x8000&rADCCON));   //Check ECFLG

      while(!(rSRCPND & (BIT_ADC)));  //check if ADC is finished with interrupt bit

      

		Pty[i] = (0x3ff&rADCDAT1);

        Ptx[i] = (0x3ff&rADCDAT0);

        

        

       //OSPrintf("----- ========(%04d,%04d)=======\n",Ptx[i], Pty[i]);  

    }

   // buf[3][0] =((buf[0][0] + buf[1][0] + buf[2][0])/3)*10;

    //buf[3][1] =((buf[0][1] + buf[1][1] + buf[2][1])/3)*10;

    Ptx[5]=(Ptx[0]+Ptx[1]+Ptx[2]+Ptx[3]+Ptx[4])/5;

    Pty[5]=(Pty[0]+Pty[1]+Pty[2]+Pty[3]+Pty[4])/5;

    OSPrintf(" ========(%04d,%04d)=======\n",Ptx[5], Pty[5]);

    

    



           

//OSPrintf("----- ========(%04d,%04d)=======\n",TPxyLocation.x,TPxyLocation.y);

     TPxyLocation.x=Ptx[5]*10;

     TPxyLocation.y=Pty[5]*10;

     //TPxyLocation.x=TPxyLocation.x*10;

    // TPxyLocation.y=TPxyLocation.y*10;

     	

	//OSMboxPost(TP_m_box,(void*)1);

	 //YH 0627, To check Stylus Up Interrupt.

	 rSUBSRCPND|=BIT_SUB_TC;

	 ClearPending(BIT_ADC);

	 rINTSUBMSK&=~(BIT_SUB_TC);

	 rINTMSK&=~(BIT_ADC);

			 

	 rADCTSC =0xd3;    //Waiting for interrupt

	 rADCTSC=rADCTSC|(1<<8); // Detect stylus up interrupt signal.



			while(1)		//to check Pen-up state

			{

			 if(rSUBSRCPND & (BIT_SUB_TC))	//check if ADC is finished with interrupt bit

				 {

					//Uart_Printf("Stylus Up Interrupt~!\n");

					

					break;	//if Stylus is up(1) state

				}

			}	

			

    //Uart_Printf("count=%03d  XP=%04d, YP=%04d\n", TouchPanelCnt++, TPxyLocation.x, TPxyLocation.y);    //X-position Conversion data            

	OSMboxPost(TP_m_box,(void*)1);

	rADCDLY=saveAdcdly; 

	rADCTSC=rADCTSC&~(1<<8); // Detect stylus Down interrupt signal.

    rSUBSRCPND|=BIT_SUB_TC;

    rINTSUBMSK &=~(BIT_SUB_TC);	// Unmask sub interrupt (TC)     

    ClearPending(BIT_ADC);

}

void Test_Touchpanel(void)

{

    //OSPrintf("ADC touch screen test\n");

    //OSPrintf("[1] calibration touch screen \n");

   // OSPrintf("Please touch the location of left top \n");

    //ts_status = TS_JUSTIFY_LEFTTOP;

    

    rADCDLY=50000;                  //Normal conversion mode delay about (1/3.6864M)*50000=13.56ms

    rADCCON=(1<<14) | (ADCPRS<<6);//| (0<<3) | (0<<2) | (0<<1) | (0);   

	//ADCPRS En, ADCPRS Value

   	rADCTSC=0xd3;  //Wfait,XP_PU,XP_Dis,XM_Dis,YP_Dis,YM_En



   // pISR_ADC = (uint32)AdcTsAuto_Handler;

   pISR_ADC = (int)AdcTsAuto;

	rINTMSK &= ~BIT_ADC;       //ADC Touch Screen Mask bit clear

	rINTSUBMSK &= ~(BIT_SUB_TC);

}