touch_screen.c

uccos2的的源码文件

/**************************************************************
Touch Screen control
**************************************************************/
#include "test.h"

#include <string.h>
#include "S3C2410.h"
#include "Touch_Screen.h"

#define ADCPRS 39
#define ITERATION 5
static unsigned int samplebuf[ITERATION][2];
static int CurrSample = 0;
int TouchFlag = 0;
/**************************************************************
The Initial of Touch Screen
**************************************************************/
void Touch_Screen_Init(void)
{
    rADCDLY = (30000);    // 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
}
//*************************************************************
void Touch_Screen_Off(void)
{
}

#define MAX_DIS 10

#define ABS(x) ((x) < 0 ? (-(x)) : (x))

static int lx,ly;
static int Button;
int MouseDown(void)
{
    return Button;
}

void GetMouseLastPos(int* x,int* y)
{
    *x = lx;
    *y = ly;
}

int IsPtInRect(int x,int y,int rx,int ry,int rw,int rh)
{
    if( x < rx || x > (rx+rw)
        || y < ry || y > (ry+rh) )
        return 0;
    return 1;
}

void Touch2Screen(int* x,int *y)
{
    *x = TX2SX(*x);
    *y = TY2SY(*y);
}


int GetMousePos(int* x,int* y)
{
    int i;
    int s1,s2,sub1,sub2;
    int count = 1;

    //if( TouchFlag & 0x01 )
        count = ITERATION;

          //Auto X-Position and Y-Position Read
        rADCTSC=(1<<7)|(1<<6)|(0<<5)|(1<<4)|(1<<3)|(1<<2)|(0);
              //[7] YM=GND, [6] YP is connected with AIN[5], [5] XM=Hi-Z, [4] XP is connected with AIN[7]
              //[3] XP pull-up disable, [2] Auto(sequential) X/Y position conversion mode, [1:0] No operation mode

        for(i=0;i< count;i++)
        {
            rADCTSC  = (1<<7)|(1<<6)|(0<<5)|(1<<4)|(1<<3)|(1<<2)|(0);
            rADCCON |= 0x1;             //Start Auto conversion
            while(rADCCON & 0x1)       //Check if Enable_start is low
            {
            }
            while(!(0x8000&rADCCON))   //Check ECFLG
            {
            }

            samplebuf[CurrSample][0] = (0x3ff&rADCDAT0);
            samplebuf[CurrSample][1] = (0x3ff&rADCDAT1);
            CurrSample++;
            if( CurrSample >= ITERATION )
                CurrSample = 0;
        }

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

    s1 = s2 = 0;
    for(i=0;i<ITERATION;i++)
    {
        s1 += samplebuf[i][0];
        s2 += samplebuf[i][1];
    }
    s1 /= ITERATION;
    s2 /= ITERATION;

    for(i=0;i<ITERATION;i++)
    {
        sub1 = s1 - samplebuf[i][0];
        sub2 = s2 - samplebuf[i][1];

       // printf("%d- %d %d %d %d %d %d\r\n",
       //         i,s1,buf[i][0],sub1,s2,buf[i][1],sub2);
        if( ABS(sub1) > MAX_DIS || ABS(sub2) > MAX_DIS )
        {
            if( Button > 0 )
                Button = MS_RELEASING;
            else
                Button = MS_RELEASED;

            *x = lx;
            *y = ly;

            return 0;
        }
    }

    sub1 = s1 - lx;
    sub2 = s2 - ly;

    if( (ABS(sub1) + ABS(sub2)) < 2 )
    {// 去抖动
        return 0;
    }

    if( Button <= 0 )
    {// 原来释放状态,现在则为按下状态
        Button = MS_PRESSING;// 第1次按下
    }
    else
    {
        Button = MS_PRESSED; // 第N次按下
    }
    lx = s1;
    ly = s2;
    *x = s1;
    *y = s2;
    return 1;
}