touch.c

linux下触摸屏驱动,实用性非常强,可以直接用在linux2.4.18版本,及2.6以上的版本

#include "Touch.h"
#include "../../target/2410addr.h"
#include "../../ucos-ii/includes.h"
#include "../../target/2410lib.h"

#define ADCPRS 39

#define TOUCH_XSIZE  (640)
#define TOUCH_YSIZE  (480)

#define TOUCH_AD_LEFT   0x2a//0x16//0x15b//0x120   
#define TOUCH_AD_RIGHT  0x3e8//0x1fe//0xec8//0xe70
#define TOUCH_AD_TOP    0x30//0x200//0x1d6//0x230
#define TOUCH_AD_BOTTOM 0x3d0//0x3d8//0xdee//0xdf0


static int xMin;
static int xMax;
static int yMin;
static int yMax;

#define TOUCH_SWAP_XY   0// 0
#define TOUCH_MIRROR_X   0
#define TOUCH_MIRROR_Y   1

#define COORD_X 0
#define COORD_Y 1

typedef struct {int Min; int Max; } tMinMax;

static tMinMax xyMinMax[2] = {
#if ((TOUCH_SWAP_XY==0) && (TOUCH_MIRROR_X==0)) || ((TOUCH_SWAP_XY) && (TOUCH_MIRROR_Y==0))
  { TOUCH_AD_LEFT, TOUCH_AD_RIGHT },
#else
  { TOUCH_AD_RIGHT, TOUCH_AD_LEFT },
#endif
#if ((TOUCH_SWAP_XY==0) && (TOUCH_MIRROR_Y==0)) || ((TOUCH_SWAP_XY) && (TOUCH_MIRROR_X==0))
  { TOUCH_AD_TOP,  TOUCH_AD_BOTTOM }
#else
  { TOUCH_AD_BOTTOM,  TOUCH_AD_TOP }
#endif
};

int AD2X(int adx) {
  INT32 r = adx - xyMinMax[COORD_X].Min;
  r *= TOUCH_XSIZE - 1;
  return r / (xyMinMax[COORD_X].Max - xyMinMax[COORD_X].Min);    
}

int AD2Y(int ady) {
  INT32 r = ady - xyMinMax[COORD_Y].Min;
  r *= TOUCH_YSIZE - 1;
  return r/(xyMinMax[COORD_Y].Max - xyMinMax[COORD_Y].Min);    
}

extern OS_EVENT 	*pLcdTask_MsgQueue;

STRU_TOUCH_MSG  StruMsg_Touch;
void *Touch_Isr(void)
{
  static int xPhys, yPhys;
  int x,y;

  /* calculate Min / Max values */
  if (xyMinMax[COORD_X].Min < xyMinMax[COORD_X].Max) {
    xMin = xyMinMax[COORD_X].Min;
    xMax = xyMinMax[COORD_X].Max;
  } else {
    xMax = xyMinMax[COORD_X].Min;
    xMin = xyMinMax[COORD_X].Max;
  }
  if (xyMinMax[COORD_Y].Min < xyMinMax[COORD_Y].Max) {
    yMin = xyMinMax[COORD_Y].Min;
    yMax = xyMinMax[COORD_Y].Max;
  } else {
    yMax = xyMinMax[COORD_Y].Min;
    yMin = xyMinMax[COORD_Y].Max;
  }

  
    rINTSUBMSK|=(BIT_SUB_ADC|BIT_SUB_TC);	

   
    if(rADCTSC&0x100)
    {

	rADCTSC&=0xff;	
    }
    else 
    {

	rADCTSC=(0<<8)|(1<<7)|(1<<6)|(0<<5)|(1<<4)|(1<<3)|(1<<2)|(0);
	

	rADCCON|=0x1;	

	while(rADCCON & 0x1);		
	while(!(0x8000&rADCCON));	

	StruMsg_Touch.ulType = MSG_TYPE_TOUCH;
	xPhys = 0x3ff&rADCDAT0;
	yPhys = 0x3ff&rADCDAT1;

	if ((xPhys <xMin) | (xPhys>xMax)  | (yPhys <yMin) | (yPhys>yMax)) {
	}
	else
	{
		x = AD2X(xPhys);
	       y = AD2Y(yPhys);

	      StruMsg_Touch.ulPara1 = x;
	      StruMsg_Touch.ulPara2 = y;
	      #if	0
		if (OSQPostInIsr(pLcdTask_MsgQueue, (void*)(&StruMsg_Touch)) == OS_Q_NEED_CONTEXT)
		{
			rADCTSC=(1<<8)|(1<<7)|(1<<6)|(0<<5)|(1<<4)|(0<<3)|(0<<2)|(3);
			
		       rSUBSRCPND|=BIT_SUB_TC;
		       rINTSUBMSK&=~(BIT_SUB_TC);	     
		       ClearPending(BIT_ADC);
			IrqStart();
			return (IrqFinish());
			
		}	
		#endif
		OSQPost(pLcdTask_MsgQueue, (void*)(&StruMsg_Touch));
	}
	rADCTSC=(1<<8)|(1<<7)|(1<<6)|(0<<5)|(1<<4)|(0<<3)|(0<<2)|(3);
   	// Stylus Up,Don't care,Don't care,Don't care,Don't care,XP pullup En,Normal,Waiting mode
    }
    rSUBSRCPND|=BIT_SUB_TC;
    rINTSUBMSK&=~(BIT_SUB_TC);	// Unmask sub interrupt (TC)     
    ClearPending(BIT_ADC);	
}


extern void Touch_IsrHandle(void);
void TOUCH_Init(void)
{
  
   
  
    rADCDLY=(50000);	// ADC Start or Interval Delay

    rADCCON = (1<<14)|(ADCPRS<<6)|(0<<3)|(0<<2)|(0<<1)|(0);	
    // Enable Prescaler,Prescaler,AIN5/7 fix,Normal,Disable read start,No operation
    rADCTSC=(0<<8)|(1<<7)|(1<<6)|(0<<5)|(1<<4)|(0<<3)|(0<<2)|(3);//tark
    // Down,YM:GND,YP:AIN5,XM:Hi-z,XP:AIN7,XP pullup En,Normal,Waiting for interrupt mode

    pISR_ADC=(unsigned)Touch_IsrHandle;
    rINTMSK &= ~(BIT_ADC);
    rINTSUBMSK &= ~(BIT_SUB_TC);	
}