请教wince5.0 下触摸屏下一句代码的意思？

我用的是mirco2440开发板，在触摸屏程序里有一段代码如下：
TSP_PowerOn(VOID)
{
    RETAILMSG(0,(TEXT("::: TSP_PowerOn()\r\n")));

    /* Use TSXM, TSXP, TSYM, TSYP            */
   v_pIOPregs->GPGCON |=  ((0x3 << 30) | (0x3 << 28) | (0x3 << 26) | (0x3 << 24));

    v_pADCregs->ADCDLY = 50000;

    v_pADCregs->ADCCON =    (1      << 14) |    /* A/D Converter Enable                    */
                            (ADCPRS <<  6) |    /* Prescaler Setting                    */
                            (0      <<  3) |    /* Analog Input Channel : 0                */
                            (0      <<  2) |    /* Normal Operation Mode                */
                            (0      <<  1) |    /* Disable Read Start                    */
                            (0      <<  0);     /* No Operation                            */

    v_pADCregs->ADCTSC =    (0      <<  8) |    /* UD_Sen                                */
                            (1      <<  7) |    /* YMON  1 (YM = GND)                    */
                            (1      <<  6) |    /* nYPON 1 (YP Connected AIN[n])        */
                            (0      <<  5) |    /* XMON  0 (XM = Z)                        */
                            (1      <<  4) |    /* nXPON 1 (XP = AIN[7])                */
                            (0      <<  3) |    /* Pull Up Disable                        */
                            (0      <<  2) |    /* Normal ADC Conversion Mode            */
                            (3      <<  0);     /* Waiting Interrupt                    */


    v_pINTregs->INTSUBMSK  &= ~(1<<IRQ_SUB_TC);

    v_pPWMregs->TCFG1  &= ~(0xf << 12);     /* Timer3's Divider Value                */
    v_pPWMregs->TCFG1  |=  (0   << 12);     /* 1/2                                    */
    v_pPWMregs->TCNTB3  = g_timer3_sampleticks;       /* Interrupt Frequency                    */
}
很明显这段代码是初始化触摸屏相关寄存器的，但是对于其中一句很是不理解，即： v_pIOPregs->GPGCON |=  ((0x3 << 30) | (0x3 << 28) | (0x3 << 26) | (0x3 << 24));
这一段代码是初始化几个中断IO端口，但这几个端口根本没有用到，原理图上已经把这几个端口上拉了。既然如此为什么还要初始化呢?请高手指点一下。

没人懂吗，自己顶

再顶……

有啊,GPG12-GPG15都是触摸接口,你好好看看这个CPU哦,当不用作触摸接口时也是AIN4,AIN5,,AIN6,,AIN7,口,

我QQ是382354867,我现在也在弄这个,还得向你请教请教