[参考译文] AM2432：AM2432：ECAP 只输入一次中断

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1405584/am2432-am2432-ecap-only-enter-an-interrupt-once

工具与软件：

您好、TI

/* ECAP Interrupt Sources */
#define ECAP_INT_ALL                    (ECAP_CEVT1_INT  | \
                                         ECAP_CEVT2_INT  | \
                                         ECAP_CEVT3_INT  | \
                                         ECAP_CEVT4_INT  | \
                                         ECAP_CNTOVF_INT | \
                                         ECAP_PRDEQ_INT  | \
                                         ECAP_CMPEQ_INT)

uint32_t gEcapBaseAddr = CONFIG_ECAP0_BASE_ADDR;
static HwiP_Object gEcapHwiObject;

void hal_ecap_it_cb(void *args)
{
    uint32_t fall = 0;
    uint32_t rise = 0;

    ECAP_intrStatusClear(gEcapBaseAddr, ECAP_INT_ALL);

    fall = ECAP_timeStampRead(gEcapBaseAddr, ECAP_CAPTURE_EVENT_2);
    rise = ECAP_timeStampRead(gEcapBaseAddr, ECAP_CAPTURE_EVENT_1);
    /* todo */
}

int32_t hal_ecap_init(void)
{
    HwiP_Params hwiPrms;

    /* Disable and Clear Interrupts */
    ECAP_intrDisable(gEcapBaseAddr, ECAP_INT_ALL);
    ECAP_intrStatusClear(gEcapBaseAddr, ECAP_INT_ALL);
    /* Disable CAP1-CAP4 register loads */
    ECAP_captureLoadingDisable(gEcapBaseAddr);
    /* Configure eCAP */
    ECAP_counterControl(gEcapBaseAddr, ECAP_COUNTER_STOP);

    /* Enable capture mode */
    ECAP_operatingModeSelect(gEcapBaseAddr, ECAP_CAPTURE_MODE);

    ECAP_continuousModeConfig(gEcapBaseAddr);

    ECAP_counterConfig(gEcapBaseAddr, 0);

    /* Set polarity of the events to falling, rising, falling, rising edge */
    ECAP_captureEvtPolarityConfig(gEcapBaseAddr,
                                  ECAP_CAPTURE_EVENT_RISING,
                                  ECAP_CAPTURE_EVENT_FALLING,
                                  ECAP_CAPTURE_EVENT_RISING,
                                  ECAP_CAPTURE_EVENT_FALLING);

    /* Set capture in time difference mode */
    ECAP_captureEvtCntrRstConfig(gEcapBaseAddr,
                                 ECAP_CAPTURE_EVENT_RESET_COUNTER_NO_RESET,
                                 ECAP_CAPTURE_EVENT_RESET_COUNTER_NO_RESET,
                                 ECAP_CAPTURE_EVENT_RESET_COUNTER_NO_RESET,
                                 ECAP_CAPTURE_EVENT_RESET_COUNTER_NO_RESET);

    ECAP_syncInOutSelect(gEcapBaseAddr, ECAP_SYNC_IN_DISABLE, ECAP_SYNC_OUT_DISABLE);

    /* Register & enable ICSSG EnDat PRU FW interrupt */
    HwiP_Params_init(&hwiPrms);
    hwiPrms.intNum      = CONFIG_ECAP0_INTR;
    hwiPrms.callback    = hal_ecap_it_cb;
    hwiPrms.args        = 0;
    hwiPrms.isPulse     = CONFIG_ECAP0_INTR_IS_PULSE;
    hwiPrms.isFIQ       = FALSE;
    HwiP_construct(&gEcapHwiObject, &hwiPrms);

    ECAP_prescaleConfig(gEcapBaseAddr, 0);
    ECAP_counterControl(gEcapBaseAddr, ECAP_COUNTER_FREE_RUNNING);
    /* Enable eCAP module */
    ECAP_captureLoadingEnable(gEcapBaseAddr);
    /* Enable interrupt */
    ECAP_intrEnable(gEcapBaseAddr, ECAP_CEVT2_INT);

    return 0;
}