ucos II+ucGUI+s3c2410+LCD+触摸屏整合

环境：ads2.2＋ARM9 ＋s3c2410
 
注意：由于编译器（ads1.2或2.2）对全局变量初始化为0的不完全支持，有时必须手动初始化为0，切记！！！
 
一、ucos II移植到ARM9 s3c2410
可从官网下载移植代码，基本无需改动。
在os_cpu_a.s中的函数UCOS_IRQHandler中的bl OSIntEnter和bl C_IRQHandler之间插入如下代码（见邵贝贝，第2版，第104页的说明：L3.18(4) ）：
        ldr r0, =OSIntNesting
        ldrb r0,[r0]
        cmp r0,#1
        bne XX
        ldr r0,=OSTCBCur
        ldr r1,[r0]
        str sp,[r1]                 ; store sp in preempted tasks's TCB       
             
XX
 
二、ucGui 390移植到ARM9 s3c2410
1. Lcd驱动：
1） 画点函数：
对dm2410实验板上的lcd，左上为原点（0，0），函数如下：
void LCD2410_SetPixel(int xp, int yp, U16 color, int dindex)
{
       *(pLCDBuffer565 + SCREEN_WIDTH*yp + xp) = color;
}
为了达到更快的显示速度，别忘了开启Cache！！！
2）LCD控制器的初始化，对2410函数如下：
int LCD2410_Init(void)
{
       if(!isLcdInit)
       {
              InitLcdPort();
              InitLcdRegs();             
              isLcdInit = 1;
              return 0;
       }
       return 1;
}
 
void InitLcdPort(void)
{
 
    // LCD port initialize.
    s2410IOP->GPCUP = 0xFFFFFFFF;
    s2410IOP->GPCCON = 0xAAAAAAAA;
    s2410IOP->GPDUP = 0xFFFFFFFF;
    s2410IOP->GPDCON = 0xAAAAAAAA;
    s2410IOP->GPGCON &= ~(3 << 8);                 /* Set LCD_PWREN as output  */
    s2410IOP->GPGCON |= (1 << 8);
    s2410IOP->GPGDAT |= (1 << 4);                 //* Backlight ON   
}
void InitLcdRegs(void)
{
       s2410LCD->LCDCON1   =   (CLKVAL_TFT << 8) |   //* VCLK = HCLK / ((CLKVAL + 1) * 2) -> About 7 Mhz
                            (EACH_FRAME << 7) |   //* 0 : Each Frame                                  
                            (3           << 5) |   // TFT LCD Pannel                                  
                            (12          << 1) |   //Y: // 16bpp Mode                                     
                            (0           << 0) ;   // Disable LCD Output                            
    s2410LCD->LCDCON2   =   (VBPD        << 24) |   //* VBPD          : ((32-1)&0xff) = 0x1f                            
                            (LINEVAL_TFT << 14) |   //* LINEVAL_TFT : 480 - 1                         
                            (VFPD        << 6) |   //* VFPD          : ((11-1)&0xff) = 0xa                           
                            (VSPW        << 0) ;   //* VSPW          : ((2-1) &0x3f) = 0x1                          
    s2410LCD->LCDCON3   =   (HBPD        << 19) |   //* HBPD          : ((88-1)&0x7f)                             
                            (HOZVAL_TFT << 8) |   //* HOZVAL_TFT    : 800 - 1                         
                            (HFPD        << 0) ;   //* HFPD          : ((40-1)&0xff)                             
    s2410LCD->LCDCON4   =   (MVAL        << 8) |   //* MVAL          : 13                             
                            (HSPW        << 0) ;   //* HSPW          : ((128-1)&0xff)                             
    s2410LCD->LCDCON5   =   (0           << 12) |   // BPP24BL       : LSB valid                       
                            (1           << 11) |   // FRM565 MODE   : 5:5:5:1 Format                    
                           (0           << 10) |   // INVVCLK       : VCLK Falling Edge               
                            (1           << 9) |   // INVVLINE      : Inverted Polarity               
                            (1           << 8) |   // INVVFRAME     : Inverted Polarity               
                            (0           << 7) |   // INVVD         : Normal                          
                            (0           << 6) |   // INVVDEN       : Normal                          
                            (0           << 5) |   // INVPWREN      : Normal                         
                            (0           << 4) |   // INVENDLINE    : Normal                          
                            (1           << 3) |   // PWREN         : Disable PWREN                   
                            (0           << 2) |   // ENLEND        : Disable LEND signal             
                            (0           << 1) |   // BSWP          : Swap Disable                    
                            (1           << 0) ;   // HWSWP         : Swap Enable                     
    s2410LCD->LCDSADDR1 = ((FRAMEBUF_DMA_BASE >> 22)     << 21) |
                           ((M5D(FRAMEBUF_DMA_BASE >> 1)) << 0);
    s2410LCD->LCDSADDR2=M5D( (FRAMEBUF_DMA_BASE+(LCD_XSIZE_TFT*LCD_YSIZE_TFT*2))>>1 );
    s2410LCD->LCDSADDR3=(((LCD_XSIZE_TFT-LCD_XSIZE_TFT)/1)<<11)|(LCD_XSIZE_TFT/1);
    s2410LCD->LCDINTMSK|=(3); // MASK LCD Sub Interrupt
    s2410LCD->LPCSEL&=(~7); // Disable LPC3600
    s2410LCD->TPAL=0; // Disable Temp Palette
              s2410LCD->LCDCON1 |= 1;      
}
 
其中，部分变量、常量定义如下：
 
#define LCD_XSIZE_TFT       (800)    
#define LCD_YSIZE_TFT       (480)
#define HOZVAL_TFT          (LCD_XSIZE_TFT-1)
#define LINEVAL_TFT         (LCD_YSIZE_TFT-1)
#define MVAL                (13)
#define MVAL_USED           (1)
#define EACH_FRAME                (0)
//STN/CSTN timing parameter for LCBHBT161M(NANYA)
#define WLH                 (3)
#define WDLY                (3)
#define LINEBLANK           (1 &0xff)
#define VBPD                ((32-1)&0xff)
#define VFPD                ((11-1)&0xff)
#define VSPW                ((2-1) &0x3f)
#define HBPD                ((88-1)&0x7f)
#define HFPD                ((40-1)&0xff)
#define HSPW                ((128-1)&0xff)
#define CLKVAL_TFT          (0)  
#define M5D(n)              ((n) & 0x1fffff)
#define SCREEN_WIDTH 800 //800
#define SCREEN_HEIGHT 480 //480
#define FRAMEBUF_DMA_BASE               (0x35000000)
U16* pLCDBuffer565=(U16*)FRAMEBUF_DMA_BASE;
 
3）填写配置文件LCDConf.h
       #define LCD_XSIZE      (800)   /* X-resolution of LCD, Logical coor. */
#define LCD_YSIZE      (480)   /* Y-resolution of LCD, Logical coor. */
#define LCD_BITSPERPIXEL (16)
#define LCD_CONTROLLER 1
#define LCD_SWAP_RB_0  1
 
2．触摸屏驱动：
       触摸屏驱动计算出触摸屏的坐标（x，y），对dm2410实验板上的触摸屏，左下为原点，但不一定是（0，0）。两个函数：
1） 设置中断向量，开中断：
void SetTSInterrupt(void)
{
    rADCDLY = (50000);
    rADCCON = (1<<14)|(ADCPRS<<6)|(7<<3)|(0<<2)|(0<<1)|(0);
      rADCTSC = (0<<8)|(1<<7)|(1<<6)|(0<<5)|(1<<4)|(0<<3)|(0<<2)|(3);
    pISR_ADC = (U32)TSIrqISR; //
    rINTMSK &= ~(BIT_ADC);
    rINTSUBMSK &= ~(BIT_SUB_TC);
}
2） 中断处理函数：
static void TSIrqISR(void)
{
    int i;
    U32 Pt[6];
    rINTSUBMSK |= (BIT_SUB_ADC|BIT_SUB_TC);
     if(rADCDAT0 & 0x8000)
    {//抬起
        isDown = 0;
        rADCTSC &= 0xff;    // Set stylus down interrupt
        TX = -1;
        TY = -1; //抬起触笔时，TX,TY要值成不大于0的数
    }
    else //按下
    {          isDown = 1;
        rADCTSC=(0<<8)|(0<<7)|(0<<6)|(1<<5)|(1<<4)|(1<<3)|(0<<2)|(1);
        for(i=0;i        for(i=0;i<5;i++)                           //5 times
        {
               rADCCON|=0x1;               // Start X-position conversion
            while(rADCCON & 0x1);       // Check if Enable_start is low
            while(!(0x8000&rADCCON));   // Check ECFLG
                     Pt[i]=(0x3ff&rADCDAT0);
        }
        Pt[5]=(Pt[0]+Pt[1]+Pt[2]+Pt[3]+Pt[4])/5;//多次采样取平均值
        TX = Pt[5];
        rADCTSC=(0<<8)|(0<<7)|(1<<6)|(1<<5)|(0<<4)|(1<<3)|(0<<2)|(2);
        for(i=0;i        for(i=0;i<5;i++)                           //5 times
        {
            rADCCON|=0x1;               // Start Y-position conversion
            while(rADCCON & 0x1);       // Check if Enable_start is low
            while(!(0x8000&rADCCON));   // Check ECFLG
            Pt[i]=(0x3ff&rADCDAT1);
        }
        Pt[5]=(Pt[0]+Pt[1]+Pt[2]+Pt[3]+Pt[4])/5;// 多次采样取平均值
 
        TY = Pt[5];
               rADCTSC=(1<<8)|(1<<7)|(1<<6)|(0<<5)|(1<<4)|(0<<3)|(0<<2)|(3);
}
    //cprintf("%d,%d\n",TX,TY);
       OSMboxPost(TouchMbox, 0);//向处理触摸进程发消息
    rSUBSRCPND |= BIT_SUB_TC;
    rINTSUBMSK &= ~(BIT_SUB_TC);         // Unmask sub interrupt (TC)    
    ClearPending(BIT_ADC);    
}
3） 需要的量：
#define LOOP 1
#define ADCPRS 0x27
int TX=0;//触摸坐标x
int TY=0;//触摸坐标y
extern OS_EVENT *TouchMbox;
int isDown;
 
4） 触摸屏校准：
Ucgui390中，带有一校准程序（于TOUCH_Calibrate.c中），可以改写为我所用（见下文）。
也可设置默认值，测出左下最小坐标minX，minY和右上最大坐标maxX，maxY，注意是触摸坐标，不是lcd坐标，如下填写配置文件GUITouchConf.h:
#define GUI_TOUCH_AD_LEFT   minX
#define GUI_TOUCH_AD_TOP    maxY
#define GUI_TOUCH_AD_RIGHT maxX
#define GUI_TOUCH_AD_BOTTOM minY  
#define GUI_TOUCH_SWAP_XY   0
 #define GUI_TOUCH_MIRROR_X   1
#define GUI_TOUCH_MIRROR_Y 1
#define TOUCH_NEED_CALIBRATE 0
 
3、如下填写GUIConf.h：
       #define GUI_OS                    (1) /* Compile with multitasking support */
#define GUI_SUPPORT_TOUCH         (1) /* Support a touch screen (req. win-manager) */
#define GUI_SUPPORT_UNICODE       (1) /* Support mixed ASCII/UNICODE strings */
#define GUI_SUPPORT_CHINESE              (1)
#define GUI_DEFAULT_FONT          &GUI_Font6x8
#define GUI_ALLOC_SIZE            12500 /* Size of dynamic memory ... For WM and memory devices*/
#define GUI_WINSUPPORT            1 /* Window manager package available */
#define GUI_SUPPORT_MEMDEV        1 /* Memory devices available */
#define GUI_SUPPORT_AA            1 /* Anti aliasing available */
 
4、ucgui与lcd驱动函数的连接，即修改LCDWin.c文件：
       在LCDWin.c中，去掉无用的头文件包含。
#define SETPIXEL(x, y, c)   LCD2410_SetPixel(x, y, c, LCD_DISPLAY_INDEX)
#define GETPIXEL(x, y)    LCD2410_GetPixel(x,y, LCD_DISPLAY_INDEX)
即将“LCDSIM_XX”改成“LCD2410_XX”，这两个函数位于lcd驱动文件中。
       ……………………………
 #define SETPIXEL(x, y, c) \
    if (!_CheckBound(c)) { \
      LCD2410_SetPixel(x, y, c, LCD_DISPLAY_INDEX); \
    }
#else
 #define SETPIXEL(x, y, c) LCD2410_SetPixel(x, y, c, LCD_DISPLAY_INDEX)
#endif
#define GETPIXEL(x, y)    LCD2410_GetPixel(x,y,LCD_DISPLAY_INDEX)
……………………………
static void _XorPixel(int x, int y) {
 unsigned int Index = LCD_L0_GetPixelIndex(x,y);
  LCD2410_SetPixel(x, y, LCD_NUM_COLORS-1-Index, LCD_DISPLAY_INDEX);
}
……………………………
int LCD_L0_Init(void) {
    return LCD2410_Init();//调用lcd初始化函数
}
 
5、某些编译器(如：ads1.2)不会初始化全局变量，因此做如下事：
1) 修改如下函数为：（位于GUICore.c）
static void _InitContext(GUI_CONTEXT* pContext) {
   
    memset(pContext,0,sizeof(GUI_CONTEXT))；//add
   
 #if GUI_SUPPORT_MEMDEV
    GUI_SelectLCD();
 #else
    LCD_SetClipRectMax();//LCD_L0_GetRect
 #endif
     pContext->pLCD_HL      = &LCD_HL_APIList;
     pContext->pAFont       = GUI_DEFAULT_FONT;
       pContext->pClipRect_HL = &GUI_Context.ClipRect;
     pContext->PenSize      = 1;
      pContext->DrawMode = GUI_DRAWMODE_NORMAL;//add
     pContext->TextMode = GUI_TEXTMODE_NORMAL;//add
     pContext->TextAlign = GUI_TA_LEFT|GUI_TA_TOP;//add
    pContext->AA_HiResEnable = 0;//add
    /* Variables in WM module */
       #if GUI_WINSUPPORT
           pContext->hAWin    = WM_GetDesktopWindow();
     #endif
     /* Variables in GUI_AA module */
     pContext->AA_Factor = 3;
     LCD_SetBkColor(GUI_DEFAULT_BKCOLOR);
     LCD_SetColor(GUI_DEFAULT_COLOR);
}
 
修改如下函数为：（位于GUIAlloc.c）
void GUI_ALLOC_Init(void) {
........
     GUI_ALLOC.NumUsedBytes = 0;
   memset(&aBlock,0,sizeof(aBlock[0])*GUI_MAXBLOCKS);/////self
    aBlock[0].Size = (1<.......
}
 
 
修改如下函数为：（位于WM.c）（――――――――――New）
void WM_Init(void) {
       if (!_IsInited) {
       ……….
       memset(&_ClipContext,0,sizeof(WM_IVR_CONTEXT));//add
       NextDrawWin = WM__FirstWin = WM_HWIN_NULL;
        ……………….
    _IsInited =1;
       }
}
2)自己编写如下函数(ads1.2)：
void MyInit()
{
       IsInitialized = 0;//MemDev
     _IsInited = 0;//Win
     WM__CreateFlags = 0;
   GUI_CURSOR_pfTempHide = NULL;
 GUI_Context.hDevData = 0;
   WM__hCapture=0;
 WM__hWinFocus=0;
   WM_pfPollPID = 0;
 WM_pfHandlePID = 0;
   GUI_pfTimerExec = 0;
   _KeyMsgCnt = 0;
}
该函数应在GUI_Init()调用之前调用。
 
6、改写GUI_Init()函数：
int GUI_Init(void) {
 int r;
 GUI_DEBUG_LOG("\nGUI_Init()");
 /* Init system wide globals first */
 GUI_DecChar = '.';
 
 /* Init context */
 _InitContext(&GUI_Context);
 GUITASK_INIT();
 r = LCD_Init();
 #if GUI_WINSUPPORT
    WM_Init();
 #endif
 GUITASK_COPY_CONTEXT();
 GUI_Clear();
  GUI_X_Init();
 GUI_CURSOR_Show();//启动即显示鼠标
 return r;
}
 
三、ucGUI与ucOS的整合，主要修改GUI_X.c文件：
       1、定义信号量及全局量：
              static OS_EVENT *DispSem;
static OS_EVENT *EventMbox;
static OS_EVENT *KeySem;
static int        KeyPressed;
static char       KeyIsInited;
       2、实现结合函数：
              int GUI_X_GetTime(void)
{
 return ((int)OSTimeGet());
}
void GUI_X_Delay(int period)
{
    INT32U ticks;
    ticks = (period * 1000) / OS_TICKS_PER_SEC;
    OSTimeDly((INT16U)ticks);
}
void GUI_X_Unlock(void)
{
    OSSemPost(DispSem);
}
void GUI_X_Lock(void)
{
     U8 err;
     OSSemPend(DispSem, 0, &err);
}
U32 GUI_X_GetTaskId(void)
{
  return ((U32)(OSTCBCur->OSTCBPrio));
}
void GUI_X_WaitEvent (void)
{
    INT8U err;
    (void)OSMboxPend(EventMbox, 0, &err);
}
void GUI_X_SignalEvent (void)
{
    (void)OSMboxPost(EventMbox, (void *)1);
}
void GUI_X_InitOS(void)
{
    DispSem   = OSSemCreate(1);
    EventMbox = OSMboxCreate((void *)0);
}
void GUI_X_ExecIdle(void) {GUI_X_Delay(1);}
 
void GUI_X_Init(void) {
    SetTSInterrupt();//此处接入触摸屏的中断设置
    GUI_TOUCH_SetDefaultCalibration();//用默认值校准触摸屏
}
 
四、与触摸屏有关的函数：
1、4个功能函数：
void GUI_TOUCH_X_ActivateX(void) {//空}  
void GUI_TOUCH_X_ActivateY(void) {//空}
int GUI_TOUCH_X_MeasureX(void) {
    return TX;//返回触摸坐标x
}  
int  GUI_TOUCH_X_MeasureY(void){
    return TY; //返回触摸坐标y
}
 
2、触摸屏校准任务（进程， 来自示例程序：TOUCH_Calibrate.c）：
#if TOUCH_NEED_CALIBRATE
static const char * _acPos[] = {
 "(upper left position)",
 "(lower right position)"
};
static void _WaitForPressedState(int Pressed) {
 GUI_PID_STATE State;
 /* Wait until touch is pressed */
 do {
    GUI_TOUCH_GetState(&State);
    if (State.Pressed == Pressed) {
      break;
    }
    GUI_Delay (100);
 } while (1);
}
static void _DispStringCentered(const char * pString) {
 GUI_RECT Rect;
 Rect.x0 = Rect.y0 = 0;
 Rect.x1 = LCD_GetXSize() - 1;
 Rect.y1 = LCD_GetYSize() - 1;
 GUI_DispStringInRect(pString, &Rect, GUI_TA_HCENTER | GUI_TA_VCENTER);
}
static void _GetPhysValues(int LogX, int LogY, int * pPhysX, int * pPhysY, const char * pString) {
 char acText[] = "Press here";
 GUI_RECT Rect;
 int FontSizeY, Align;
 FontSizeY = GUI_GetFontSizeY();
 GUI_Clear();
 GUI_SetColor(GUI_BLACK);
 _DispStringCentered("Runtime calibration,\n"
                      "please touch the screen\n"
                      "at the center of the ring."); /* Ask user to press the touch */
 /* Calculate the rectangle for the string */
 Rect.y0 = LogY - FontSizeY;
 Rect.y1 = LogY + FontSizeY;
 if (LogX < LCD_GetXSize() / 2) {
    Rect.x0 = LogX + 15;
    Rect.x1 = LCD_GetXSize();
    Align = GUI_TA_LEFT;
 } else {
    Rect.x0 = 0;
   Rect.x1 = LogX - 15;
    Align = GUI_TA_RIGHT;
 }
 /* Show the text nearby the ring */
 GUI_DispStringInRect(acText, &Rect, Align | GUI_TA_TOP);
 GUI_DispStringInRect(pString, &Rect, Align | GUI_TA_BOTTOM);
 /* Draw the ring */
 GUI_FillCircle(LogX, LogY, 10);
 GUI_SetColor(GUI_WHITE);
 GUI_FillCircle(LogX, LogY, 5);
 GUI_SetColor(GUI_BLACK);
 /* Wait until touch is pressed */
 _WaitForPressedState(1);
 *pPhysX = GUI_TOUCH_GetxPhys();
 *pPhysY = GUI_TOUCH_GetyPhys();
 /* Wait until touch is released */
 _WaitForPressedState(0);
}
 
static void _Explain(void) {
 _DispStringCentered("This sample shows how\n"
                      "a touch screen can be\n"
                      "calibrated at run time.\n"
                      "Please press the touch\n"
                      "screen to continue...");
 GUI_DispStringHCenterAt("TOUCH_Calibrate", LCD_GetXSize() / 2, 5);
 _WaitForPressedState(1);
 _WaitForPressedState(0);
}
 
void CalibrateTask(void* pdata) {//触摸屏校准任务入口
 int aPhysX[2], aPhysY[2], aLogX[2], aLogY[2], i;
 GUI_SetBkColor(GUI_WHITE);
 GUI_Clear();
 GUI_SetColor(GUI_BLACK);
 GUI_SetFont(&GUI_Font13B_ASCII);
 _Explain();
 /* Set the logical values */
 aLogX[0] = 15;
 aLogY[0] = 15;
 aLogX[1] = LCD_GetXSize() - 20;
 aLogY[1] = LCD_GetYSize() - 20;
 /* Get the physical values of the AD converter for 2 positions */
 for (i = 0; i < 2; i++) {
    _GetPhysValues(aLogX[i], aLogY[i], &aPhysX[i], &aPhysY[i], _acPos[i]);
 }
 /* Use the physical values to calibrate the touch screen */
 GUI_TOUCH_Calibrate(0, aLogX[0], aLogX[1], aPhysX[0], aPhysX[1]); /* Calibrate X-axis */
 GUI_TOUCH_Calibrate(1, aLogY[0], aLogY[1], aPhysY[0], aPhysY[1]); /* Calibrate Y-axis */
 
 { /* calculate and display values for configuration file */
    int calX0, calX1;
    int calY0, calY1;
    GUI_Clear();
   
    GUI_TOUCH_GetCalData(GUI_COORD_X, &calX0, &calX1);
    GUI_TOUCH_GetCalData(GUI_COORD_Y, &calY0, &calY1);
   
    GUI_DispStringAt("calX0: ", 0, 0); GUI_DispDec(calX0, 4); GUI_DispNextLine();
    GUI_DispString ("calX1: ");       GUI_DispDec(calX1, 4); GUI_DispNextLine();
    GUI_DispString ("calY0: ");       GUI_DispDec(calY0, 4); GUI_DispNextLine();
    GUI_DispString ("calY1: ");       GUI_DispDec(calY1, 4);
     
    GUI_DispStringAt("lcdx0: ", 0, 200); GUI_DispDec(aLogX[0], 4); GUI_DispNextLine();
    GUI_DispString ("lcdx1: ");       GUI_DispDec(aLogX[1], 4); GUI_DispNextLine();
    GUI_DispString ("lcdy0: ");       GUI_DispDec(aLogY[0], 4); GUI_DispNextLine();
    GUI_DispString ("lcdy1: ");       GUI_DispDec(aLogY[1], 4); GUI_DispNextLine();
   
    GUI_DispString ("tscX0: ");       GUI_DispDec(aPhysX[0], 4); GUI_DispNextLine();
    GUI_DispString ("tscX1: ");       GUI_DispDec(aPhysX[1], 4); GUI_DispNextLine();
    GUI_DispString ("tscY0: ");       GUI_DispDec(aPhysY[0], 4); GUI_DispNextLine();
    GUI_DispString ("tscY1: ");       GUI_DispDec(aPhysY[1], 4); GUI_DispNextLine();
   
    GUI_DispString ("Please touch display to continue...");
    GUI_Delay(1000);
   
    _WaitForPressedState(1);
    _WaitForPressedState(0);
 }
 GUI_Clear();     
 SystemOn();
 OSTaskSuspend(OS_PRIO_SELF);
 
}
3、为了响应触摸屏，做如下事：
       1）创建进程处理触摸事件，形式如下：
              void TouchTask(void* data) {
              INT8U err;
              while(1)
              {
                     CONSOL_Printf("Waiting for Touch......\n");
OSMboxPend(TouchMbox, 0, &err); /* Acquire semaphore to perform random numbers */
                     CONSOL_Printf("Got a message\n");
                     GUI_TOUCH_Exec();//
                     }
}
2) 如下修改函数 GUI_TOUCH_Exec()：
void GUI_TOUCH_Exec(void) {
 #ifndef WIN32
 static U8 ReadState;
 int x,y;
 /* calculate Min / Max values */
 if (xyMinMax[GUI_COORD_X].Min < xyMinMax[GUI_COORD_X].Max) {
    xMin = xyMinMax[GUI_COORD_X].Min;
    xMax = xyMinMax[GUI_COORD_X].Max;
 } else {
    xMax = xyMinMax[GUI_COORD_X].Min;
    xMin = xyMinMax[GUI_COORD_X].Max;
 }
 if (xyMinMax[GUI_COORD_Y].Min < xyMinMax[GUI_COORD_Y].Max) {
    yMin = xyMinMax[GUI_COORD_Y].Min;
    yMax = xyMinMax[GUI_COORD_Y].Max;
 } else {
    yMax = xyMinMax[GUI_COORD_Y].Min;
    yMin = xyMinMax[GUI_COORD_Y].Max;
 }
  /* Execute the state machine which reads the touch */
 //switch (ReadState) {
 //case 0:
    yPhys = TOUCH_X_MeasureY();
   // TOUCH_X_ActivateY(); /* Prepare X- measurement */
 // ReadState++;
 // break;
 //default:
    xPhys = TOUCH_X_MeasureX();
  // TOUCH_X_ActivateX(); /* Prepare Y- measurement */
    /* Convert values into logical values */
      #if !GUI_TOUCH_SWAP_XY   /* Is X/Y swapped ? */
        x = xPhys;
        y = yPhys;
      #else
        x = yPhys;
        y = xPhys;
      #endif
 
    if ((x xMax) | (y yMax)) {
      GUI_TOUCH_StoreUnstable(-1,-1);
    } else {
      x = AD2X(x);
      y = AD2Y(y);
      GUI_TOUCH_StoreUnstable(x,y);
    }
    /* Reset state machine */
    //ReadState=0;
  // break;
 //}
 #endif /* WIN32 */
}
 
五、     GUI多任务测试：
测试程序：MT_MultiTasking.c

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