TMS320F28377D 的ECAP 模块测试方波的频率和占空比-TI中文支持网

在程序中试过两种方式，连续的和 one-short ，连续的得不到正确的结果，one-short可以，但是只能进入中断函数一次，后续Ecap reg 就不在捕获寄存器了，代码如下

void ECaptureConfig(volatile struct ECAP_REGS *reg)
{
    reg-> ECEINT.all = 0x0000;             // Disable all capture __interrupts
    reg-> ECCLR.all = 0xFFFF;              // Clear all CAP __interrupt flags
    reg-> ECCTL1.bit.CAPLDEN = 0;          // Disable CAP1-CAP4 register loads
    reg-> ECCTL2.bit.TSCTRSTOP = 0;        // Make sure the counter is stopped

   // Configure peripheral registers
//    reg-> ECCTL1.bit.FREE_SOFT =2;//free run
    reg-> ECCTL2.bit.CONT_ONESHT = 1;      // One-shot
    reg-> ECCTL2.bit.STOP_WRAP = 3;        // Stop at 4 events
    reg-> ECCTL1.bit.CAP1POL = EC_RISING;    // Falling edge
    reg-> ECCTL1.bit.CAP2POL = EC_FALLING;    //1= Rising edge
    reg-> ECCTL1.bit.CAP3POL = EC_RISING;    //0= Falling edge
    reg-> ECCTL1.bit.CAP4POL = EC_FALLING;    // Rising edge
    reg-> ECCTL1.bit.CTRRST1 = 0;   // Difference operation
    reg-> ECCTL1.bit.CTRRST2 = 0;   // Difference operation
    reg-> ECCTL1.bit.CTRRST3 = 0;   // Difference operation
    reg-> ECCTL1.bit.CTRRST4 = 0;   // Difference operation
    reg-> ECCTL2.bit.SYNCI_EN = 0;   // DisEnable sync in
    reg-> ECCTL2.bit.SYNCO_SEL = 0;        // Pass through

reg-> ECCTL1.bit.CAPLDEN = 1; // Enable capture units

    //need change for different cap
    reg->ECCTL2.bit.REARM=1;
    reg-> ECEINT.bit.CEVT4 = 1;            // 1 events = __interrupt
    reg-> ECEINT.bit.CTROVF =1;
    reg-> ECCTL2.bit.TSCTRSTOP = 1;        // Start Counter
}

void EcapInit(void)
{
ECaptureConfig(&ECap1Regs);
}

__interrupt void ecap1_isr(void)
{

uint32_t prdio =0,duty=0;
PieCtrlRegs.PIEACK.all = PIEACK_GROUP4;

    if(ECap1Regs.ECFLG.bit.CTROVF == 1)
    {
        ECap1Regs.ECCLR.bit.CTROVF = 1;
        ECap1Regs.ECCLR.bit.INT = 1;
    }
    if(ECap1Regs.ECFLG.bit.CEVT4 == 1)
    {
        ECap1Regs.ECCLR.bit.CEVT1 = 1;
        ECap1Regs.ECCLR.bit.CEVT2 = 1;
        ECap1Regs.ECCLR.bit.CEVT3 = 1;
        ECap1Regs.ECCLR.bit.CEVT4 = 1;
        ECap1Regs.ECCLR.bit.INT = 1;

          prdio= ECap1Regs.CAP3 – ECap1Regs.CAP1;
          duty = ECap1Regs.CAP2 – ECap1Regs.CAP1;
          if(prdio >0)
          {
              FreData[0].frequen = 150000000/prdio;
              FreData[0].duty = duty*100/prdio;
          }else
          {
              FreData[0].frequen = 0;
              FreData[0].duty = 0;
          }

}
// // arm one-shot

ECap1Regs.ECCTL2.bit.TSCTRSTOP =0;
// ECap1Regs.ECCTL2.bit.REARM = 1;

}
#endi

上电后第一次进中断函数的频率值和占空比都是正常的，但捕获不会再次发生，如果把中断的这句 ECap1Regs.ECCTL2.bit.REARM = 1; 加上，CEVT1~4 会立刻置位，ECAp1~4 的值和TSCTR的值相等，而且在中断函数中无法清零。我想持续读取方波的频率应该怎么办？

Susan Yang：

您可以参考下C2000WARE内例程的设置

C2000Ware_2_00_00_02\device_support\f2837xd\examples\cpu1\ecap_capture_pwm

该例程是one-shot的

//
// InitECapture - Initialize ECAP1 configurations
//
void InitECapture()
{ECap1Regs.ECEINT.all = 0x0000;// Disable all capture __interruptsECap1Regs.ECCLR.all = 0xFFFF;// Clear all CAP __interrupt flagsECap1Regs.ECCTL1.bit.CAPLDEN = 0;// Disable CAP1-CAP4 register loadsECap1Regs.ECCTL2.bit.TSCTRSTOP = 0;// Make sure the counter is stopped//// Configure peripheral registers//ECap1Regs.ECCTL2.bit.CONT_ONESHT = 1;// One-shotECap1Regs.ECCTL2.bit.STOP_WRAP = 3;// Stop at 4 eventsECap1Regs.ECCTL1.bit.CAP1POL = 1;// Falling edgeECap1Regs.ECCTL1.bit.CAP2POL = 0;// Rising edgeECap1Regs.ECCTL1.bit.CAP3POL = 1;// Falling edgeECap1Regs.ECCTL1.bit.CAP4POL = 0;// Rising edgeECap1Regs.ECCTL1.bit.CTRRST1 = 1;// Difference operationECap1Regs.ECCTL1.bit.CTRRST2 = 1;// Difference operationECap1Regs.ECCTL1.bit.CTRRST3 = 1;// Difference operationECap1Regs.ECCTL1.bit.CTRRST4 = 1;// Difference operationECap1Regs.ECCTL2.bit.SYNCI_EN = 1;// Enable sync inECap1Regs.ECCTL2.bit.SYNCO_SEL = 0;// Pass throughECap1Regs.ECCTL1.bit.CAPLDEN = 1;// Enable capture unitsECap1Regs.ECCTL2.bit.TSCTRSTOP = 1;// Start CounterECap1Regs.ECCTL2.bit.REARM = 1;// arm one-shotECap1Regs.ECCTL1.bit.CAPLDEN = 1;// Enable CAP1-CAP4 register loadsECap1Regs.ECEINT.bit.CEVT4 = 1;// 4 events = __interrupt
}//
// ecap1_isr - ECAP1 ISR
//Cap input is syc'ed to SYSCLKOUT so there may be
//a +/- 1 cycle variation
//
__interrupt void ecap1_isr(void)
{if(ECap1Regs.CAP2 > EPwm3Regs.TBPRD*4+4 ||ECap1Regs.CAP2 < EPwm3Regs.TBPRD*4-4){Fail();}if(ECap1Regs.CAP3 > EPwm3Regs.TBPRD*4+4 ||ECap1Regs.CAP3 < EPwm3Regs.TBPRD*4-4){Fail();}if(ECap1Regs.CAP4 > EPwm3Regs.TBPRD*4+4 ||ECap1Regs.CAP4 < EPwm3Regs.TBPRD*4-4){Fail();}ECap1IntCount++;if(EPwm3TimerDirection == EPWM_TIMER_UP){if(EPwm3Regs.TBPRD < PWM3_TIMER_MAX){EPwm3Regs.TBPRD++;}else{EPwm3TimerDirection = EPWM_TIMER_DOWN;EPwm3Regs.TBPRD--;}}else{if(EPwm3Regs.TBPRD > PWM3_TIMER_MIN){EPwm3Regs.TBPRD--;}else{EPwm3TimerDirection = EPWM_TIMER_UP;EPwm3Regs.TBPRD++;}}ECap1PassCount++;ECap1Regs.ECCLR.bit.CEVT4 = 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;
}

reg-> ECCTL1.bit.CAPLDEN = 1; // Enable capture units

void EcapInit(void)
{
ECaptureConfig(&ECap1Regs);
}

__interrupt void ecap1_isr(void)
{

uint32_t prdio =0,duty=0;
PieCtrlRegs.PIEACK.all = PIEACK_GROUP4;

}
// // arm one-shot

ECap1Regs.ECCTL2.bit.TSCTRSTOP =0;
// ECap1Regs.ECCTL2.bit.REARM = 1;

}
#endi

user4329368：

回复 Susan Yang:

配置除了没有 EPWM 部分，配置是一样的，但结果却是不对的。 REARM 这个bit 的作用具体是什么，只用在one-short模式吗？我不是特别清楚。

TMS320F28377D 的ECAP 模块测试方波的频率和占空比

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