我想用F28035的ECAP1引脚作为外部中断引脚，配置如下：
//----------------------ECAP1设置-------------------------------
EALLOW;
GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 3; // 0=GPIO, 1=SPISTE-A, 2=LINRX-A, 3=ECAP1
GpioCtrlRegs.GPADIR.bit.GPIO19 = 0; // 1=OUTput, 0=INput
GpioCtrlRegs.GPAPUD.bit.GPIO19 = 0; // Enable pull-up on GPIO19 (CAP1)
GpioCtrlRegs.GPAQSEL2.bit.GPIO19 = 0; // Synch to SYSCLKOUT GPIO19 (CAP1)
PieVectTable.ECAP1_INT = &ECAP1_ISR;
EDIS;
InitECapture();
IER |= M_INT4;
PieCtrlRegs.PIEIER4.bit.INTx1 = 1; // Enable interrupt ECAP1_INT
void InitECapture() {
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.CONT_ONESHT = 1; // One-shot
ECap1Regs.ECCTL2.bit.STOP_WRAP = 3; // Stop at 4 events
ECap1Regs.ECCTL1.bit.CAP1POL = 1; // Falling edge
ECap1Regs.ECCTL1.bit.CAP2POL = 0; // Rising edge
ECap1Regs.ECCTL1.bit.CAP3POL = 1; // Falling edge
ECap1Regs.ECCTL1.bit.CAP4POL = 0; // Rising edge
ECap1Regs.ECCTL1.bit.CTRRST1 = 1; // Difference operation
ECap1Regs.ECCTL1.bit.CTRRST2 = 1; // Difference operation
ECap1Regs.ECCTL1.bit.CTRRST3 = 1; // Difference operation
ECap1Regs.ECCTL1.bit.CTRRST4 = 1; // Difference operation
ECap1Regs.ECCTL2.bit.SYNCI_EN = 1; // Enable sync in
ECap1Regs.ECCTL2.bit.SYNCO_SEL = 0; // Pass through
ECap1Regs.ECCTL1.bit.CAPLDEN = 1; // Enable capture units
ECap1Regs.ECCTL2.bit.TSCTRSTOP = 1; // Start Counter
ECap1Regs.ECCTL2.bit.REARM = 1; // arm one-shot
ECap1Regs.ECCTL1.bit.CAPLDEN = 1; // Enable CAP1-CAP4 register loads
ECap1Regs.ECEINT.bit.CEVT4 = 1; // 4 events = interrupt
}
interrupt void ECAP1_ISR(void)
GpioDataRegs.GPBTOGGLE.bit.GPIO43 = 1;
ECap1Regs.ECCLR.bit.CEVT4 = 1;
ECap1Regs.ECCLR.bit.INT = 1;
ECap1Regs.ECCTL2.bit.REARM = 1;
PieCtrlRegs.PIEACK.all = PIEACK_GROUP4;
}
仿真时给ECAP1引脚输入方波信号，但程序始终不会进入中断，但将ECFRC相应的位置1就能进入中断。不知为何？
