[参考译文] TMS320F28379D：TMS320F28379D：Sinc3滤波器错误样片概览(续)

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1426165/tms320f28379d-tms320f28379d-walkaround-for-sinc3-filter-incorrect-samples-continued

工具与软件：

您好、 Manoj Santha Mohan

我还有一个澄清,我不是 AB ; e 张贴在上一个线程,

如果读取的数据如下所示：

滤波器稳定时间/延迟在哪里？ 我们是否仅在运行时启用/禁用主滤波器时才需要担心延迟？

考虑以下示例：

OSR：200、使用滤波器、数据速率为20微秒。

假设 只有在20微秒后才设置通道数据确认中断、我是否正确？我是否还 需要将此数据视为" 无效的任何错误 "数据、还是我需要等待60微秒？

这是我尝试使用 确认中断读取数据的方式、您能否告诉我读取数据的正确时间：

• 首先在 PWM ISR 中：我启用 SDFM 确认中断
• 在 SDFM ISR 中、 我检查是否存在相同的 SDFM 确认标志、如果设置了该标志、则从数据过滤器读取数据
• 然后我禁用 正常通道确认中断。
• 此外、当  调用 PWM ISR 时、将重复相同的过程。

我还试图测量到 SDFM 模块设置确认位的时间(比如下面的 testTCBR1, testTCBR1 ),我预计它是20微秒,但它似乎不是恒定的,它不断地从大约1微秒变化到18微秒。-->这是预期的行为。 我的印象是,它将不断地20微秒

__interrupt void pwm11_ISR(void)
{
    runControl();
	
	//pwm is configured with up-down counter mode.
	//pwm ISR is triggered if TCBR is 0.
	//so 0 to 2500 and back to 0. This is 50 microseconds(1 pwm cycle)
	//0 to 2500 is 25 microseconds.(half pwm cycle)
	//So (testTCBR2 - testTCBR1) * (25/2500) is the time difference (in microseconds) between testTCBR2 and testTCBR1.
    testTCBR1 = EPWM_getTimeBaseCounterValue(EPWM11_BASE);	//log the start time
	
    SDFM_enableInterrupt(SDFM2_BASE, SDFM_FILTER_1, SDFM_DATA_FILTER_ACKNOWLEDGE_INTERRUPT);
    SDFM_enableInterrupt(SDFM2_BASE, SDFM_FILTER_2, SDFM_DATA_FILTER_ACKNOWLEDGE_INTERRUPT);
    SDFM_enableInterrupt(SDFM2_BASE, SDFM_FILTER_3, SDFM_DATA_FILTER_ACKNOWLEDGE_INTERRUPT);

    // Acknowledges the interrupt
    HAL_ackInt_M1(halMtrHandle[MTR_1]);
}

__interrupt void M1_INT_SDFM1_ISR(void)
{
    AMC1303Vars[0].SDFMCounter++;

    if(SDFM_getNewFilterDataStatus(SDFM2_BASE, SDFM_FILTER_1))
    {
		testTCBR2 = EPWM_getTimeBaseCounterValue(EPWM11_BASE);	//log end time 
		AMC1303Vars[0].rawfilter2Result = (int16_t) (SDFM_getFilterData(SDFM2_BASE, SDFM_FILTER_1) >> 16U);   //phase u
		SDFM_clearInterruptFlag(SDFM2_BASE, (SDFM_MASTER_INTERRUPT_FLAG | SDFM_FILTER_1_NEW_DATA_FLAG));
        SDFM_disableInterrupt(SDFM2_BASE, SDFM_FILTER_1, SDFM_DATA_FILTER_ACKNOWLEDGE_INTERRUPT);
    }

    if(SDFM_getNewFilterDataStatus(SDFM2_BASE, SDFM_FILTER_2))
    {
        AMC1303Vars[0].rawfilter2Result = (int16_t) (SDFM_getFilterData(SDFM2_BASE, SDFM_FILTER_2) >> 16U);   //phase v
        SDFM_clearInterruptFlag(SDFM2_BASE, (SDFM_MASTER_INTERRUPT_FLAG | SDFM_FILTER_2_NEW_DATA_FLAG));
        SDFM_disableInterrupt(SDFM2_BASE, SDFM_FILTER_2, SDFM_DATA_FILTER_ACKNOWLEDGE_INTERRUPT);
    }

    if(SDFM_getNewFilterDataStatus(SDFM2_BASE, SDFM_FILTER_3))
    {
        AMC1303Vars[0].rawfilter3Result = (int16_t) (SDFM_getFilterData(SDFM2_BASE, SDFM_FILTER_3) >> 16U);   //phase w
        SDFM_clearInterruptFlag(SDFM2_BASE, (SDFM_MASTER_INTERRUPT_FLAG | SDFM_FILTER_3_NEW_DATA_FLAG));
        SDFM_disableInterrupt(SDFM2_BASE, SDFM_FILTER_3, SDFM_DATA_FILTER_ACKNOWLEDGE_INTERRUPT);
    }

    Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP5);
}