mx1touch.hpp

完整的触摸屏驱动源程序

/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
// MX1TOUCH- Touch Screen driver written to utilize the FreeScale MX1
//      built-in touch controller.
//
//
// Notes:
//
//  This driver has been tested with the MX1 ADS eval board exclusively.
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/

#ifndef _MX1TOUCH_
#define _MX1TOUCH_

#include "peg.hpp"

/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
// ASP registers

typedef struct {
    volatile PEGULONG DataIn;
    volatile PEGULONG Spare1[3];
    volatile PEGULONG Control;
    volatile PEGULONG SampleRate;
    volatile PEGULONG IntCtrl;
    volatile PEGULONG Status;
    volatile PEGULONG Spare2[3];
    volatile PEGULONG ClockDiv;
    volatile PEGULONG Compare;
    volatile PEGULONG FIFOPtr;
} ASP_REG_BLOCK;


/*--------------------------------------------------------------------------*/
// Delay values- User defined delay values. These values are currently
// in 10ms ticks, which is the timebase used when creating this driver.
// You can adjust these values if needed for your system.
/*--------------------------------------------------------------------------*/

#if defined(PEGSMX)

#define TOUCH_POLLING_PERIOD    3   // Polling Interval
#define TOUCH_SETTLE_DELAY     10   // How long to settle on a value?

#define TOUCH_NOISE_LIMIT     500   // some variation in consecutive ATOD
                                    // readings is normal. A lot of variation
                                    // indicates the screen is settling and
                                    // the user is just touching or releasing.
                                    // How much variation between reads is OK
                                    // is determined by this variable


#define TOUCH_DELAY(a)  count(a, ticks, INF);

#elif defined(PEG_QUADROS)

#define TOUCH_POLLING_PERIOD    3   // Polling Interval
#define TOUCH_SETTLE_DELAY      5   // How long to settle on a value?

#define TOUCH_NOISE_LIMIT     400   // some variation in consecutive ATOD
                                    // readings is normal. A lot of variation
                                    // indicates the screen is settling and
                                    // the user is just touching or releasing.
                                    // How much variation between reads is OK
                                    // is determined by this variable

#define TOUCH_DELAY(a)  KS_SleepTask(COUNTER1, a);

#elif defined(PEG_PRKERNEL)

#define TOUCH_POLLING_PERIOD    3   // Polling Interval
#define TOUCH_SETTLE_DELAY      5   // How long to settle on a value?

#define TOUCH_NOISE_LIMIT     400   // some variation in consecutive ATOD
                                    // readings is normal. A lot of variation
                                    // indicates the screen is settling and
                                    // the user is just touching or releasing.
                                    // How much variation between reads is OK
                                    // is determined by this variable

#define TOUCH_DELAY(a)  dly_tsk(a);

#endif

/*--------------------------------------------------------------------------*/
// Miscellaneous definitions used in the driver code...
/*--------------------------------------------------------------------------*/

#define PEN_DOWN_IRQ  46
#define PEN_UP_IRQ     5
#define PEN_DATA_IRQ  33

#define ASP_FIFO_DEPTH 12

#define ASP_INIT_VAL 0x02005001;    // init value, not enabled
#define ASP_ENABLE   0x02005003;    // turn on ASP module

#define ASP_DMCNT       6           // decimation count
#define ASP_BIT_SEL     0           // starting bit of FIR output
#define ASP_IDLE_CNT    2           // idle clocks between samples
#define ASP_DATA_SETUP  2           // delay after switch change



#define TS_TOUCHED    0x8000        // Touch State Last Touched
#define TS_TOUCH_SENT 0x4000        // PM_LBUTTONDOWN was sent


/*--------------------------------------------------------------------------*/
// TOUCH_CAL_DATA
//
// Calibration data used to convert raw ATOD values into pixel coords
/*--------------------------------------------------------------------------*/
typedef struct
{
    PEGUSHORT RawXVals[4];
    PEGUSHORT RawYVals[4];
    PEGINT    ScreenWidth;
    PEGINT    ScreenHeight;
    PEGINT       CenterX;
    PEGINT    CenterY;
    PEGBOOL   IsCalibrated;

} TOUCH_CAL_DATA;

/*--------------------------------------------------------------------------*/
// indexes into TOUCH_CAL_DATA
/*--------------------------------------------------------------------------*/

#define TC_UL 0
#define TC_LL 1
#define TC_UR 2
#define TC_LR 3

void   TouchConfigureHardware(void);     // called first
void   CalibrateTouchScreen(void);       // called second
void   TouchSample(PEGUSHORT *pPutX, PEGUSHORT *pPutY);


#endif