请问28035Ecap如何设置可以使上升沿和下降沿同时触发一个中断ECAP1？

我在用GPIO24作为Ecap时，只能使其上升沿触发中断ECAP1_INT，或下降沿触发ECAP1_INT，怎么就不能二者都触发中断ECAP1_INT？
求各位能否给出个代码的例子，我的例子贴出来，看看怎么修改？
1、初始化
EALLOW;                       // Enable EALLOW
// Set up the ECAP1 pin to primary function
GpioCtrlRegs.GPAPUD.bit.GPIO24 = 0;//上拉
GpioCtrlRegs.GPADIR.bit.GPIO24 = 0; //输入
GpioCtrlRegs.GPAQSEL2.bit.GPIO24 = 0; //
GpioCtrlRegs.GPAMUX2.bit.GPIO24 = 1;  // GPIO24 is ECAP1
EDIS;                         // Disable EALLOW
   ECap1Regs.ECEINT.all = 0x0000;             // Disable all capture interrupts
   ECap1Regs.ECCLR.all = 0xFFFF;              // Clear all CAP interrupt flags
   ECap1Regs.ECCTL1.bit.CAPLDEN = 0;          // Disable CAP1-CAP4 register loads
   ECap1Regs.ECCTL2.bit.TSCTRSTOP = 0;        // Make sure the counter is stopped
   // Configure peripheral registers
   ECap1Regs.ECCTL2.bit.CAP_APWM = 0; //Ecap模式
   ECap1Regs.ECCTL2.bit.CONT_ONESHT = 1;      // one shot mode
   ECap1Regs.ECCTL2.bit.STOP_WRAP = 1;        // Stop at 2 events
   //ECap1Regs.ECCTL1.bit.CAP1POL = 1;          // Falling edge
   ECap1Regs.ECCTL1.bit.CAP2POL = 0;          // Rising edge
   ECap1Regs.ECCTL2.bit.SYNCI_EN = 0;         // Disable sync in
   ECap1Regs.ECCTL2.bit.SYNCO_SEL = 2;   //Disable sync out
   ECap1Regs.ECCTL2.bit.REARM = 1;            // arm one-shot
   //ECap1Regs.ECEINT.bit.CEVT1 = 1;            // 1st events = interrupt
   ECap1Regs.ECEINT.bit.CEVT2 = 1;            // 2st events = interrupt
2、开中断
   EALLOW;
   PieVectTable.ECAP1_INT = &ecap1_isr;
   EDIS;
   IER |= M_INT4;
   PieCtrlRegs.PIEIER4.bit.INTx1 = 1;
3、中断函数
interrupt void ecap1_isr(void)
[
    GpioDataRegs.GPATOGGLE.bit.GPIO6 ^=1; //用来测试中断跳变和外部信号是否一致
    //ECap1Regs.ECCLR.bit.CEVT1 = 1;
    ECap1Regs.ECCLR.bit.CEVT2 = 1;
    ECap1Regs.ECCLR.bit.INT = 1;
    ECap1Regs.ECCTL2.bit.REARM = 1;
    // Acknowledge this interrupt to receive more interrupts from group 4
    PieCtrlRegs.PIEACK.all = PIEACK_GROUP4;
]