中断函数：
interrupt void S3_GetPressed_isr(void)
{
S3_GetPressed_Flag=1-S3_GetPressed_Flag;
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}
注意：以下程序 EALLOW/EDIS未写出，实际程序中没问题的。
gpio初始化：
GpioCtrlRegs.GPAPUD.bit.GPIO12 = 0;
GpioCtrlRegs.GPAMUX1.bit.GPIO12 = 0;
GpioCtrlRegs.GPADIR.bit.GPIO12 = 0;
GpioCtrlRegs.GPAQSEL1.bit.GPIO12 = 2;
GpioCtrlRegs.GPACTRL.bit.QUALPRD1 = 0xff;
GpioIntRegs.GPIOXINT1SEL.bit.GPIOSEL = 12;
连接中断函数：
PieVectTable.XINT1 = &S3_GetPressed_isr;
中断使能：
XIntruptRegs.XINT1CR.bit.POLARITY = 1;
XIntruptRegs.XINT1CR.bit.ENABLE = 1;
IER |= M_INT1;
PieCtrlRegs.PIEIER1.bit.INTx4 = 1;
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