AM6422: DMA搬运ADC数据的时候如何知道是从ADC的哪个通道搬运的？

static void App_udmaRxHpdInit(Udma_ChHandle rxChHandle,
                              uint8_t *pHpdMem,
                              const uint32_t *destBuf,
                              uint32_t length)
{
    CSL_UdmapCppi5HMPD *pHpd = (CSL_UdmapCppi5HMPD *) pHpdMem;
    uint32_t descType = (uint32_t)CSL_UDMAP_CPPI5_PD_DESCINFO_DTYPE_VAL_HOST;

    /* Setup descriptor */
    CSL_udmapCppi5SetDescType(pHpd, descType);
    CSL_udmapCppi5SetEpiDataPresent(pHpd, FALSE);
    CSL_udmapCppi5SetPsDataLoc(pHpd, 0U);
    CSL_udmapCppi5SetPsDataLen(pHpd, 0U);
    CSL_udmapCppi5SetPktLen(pHpd, descType, length);
    CSL_udmapCppi5SetPsFlags(pHpd, 0U);
    CSL_udmapCppi5SetIds(pHpd, descType, 0x321, UDMA_DEFAULT_FLOW_ID);
    CSL_udmapCppi5SetSrcTag(pHpd, 0x0000);     /* Not used */
    CSL_udmapCppi5SetDstTag(pHpd, 0x0000);     /* Not used */
    /* Return Policy descriptors are reserved in case of AM243X/Am64X */
    CSL_udmapCppi5SetReturnPolicy(
        pHpd,
        descType,
        0U,
        0U,
        0U,
        0U);
    CSL_udmapCppi5LinkDesc(pHpd, 0U);
    CSL_udmapCppi5SetBufferAddr(pHpd, (uint64_t) Udma_defaultVirtToPhyFxn(destBuf, 0U, NULL));
    CSL_udmapCppi5SetBufferLen(pHpd, length);
    CSL_udmapCppi5SetOrgBufferAddr(pHpd, (uint64_t) Udma_defaultVirtToPhyFxn(destBuf, 0U, NULL));
    CSL_udmapCppi5SetOrgBufferLen(pHpd, length);

    /* Writeback cache */
    CacheP_wb(pHpdMem, UDMA_TEST_DESC_SIZE, CacheP_TYPE_ALLD);

    return;
}

我使用的是mcu_plus_sdk_am64x_08_03_00_18\examples\drivers\udma\udma_adc_read例程，我看上面DMAINIT的代码中没有写DMA是从哪个ADC通道搬运数据的，哪我应该从哪个地方知道DMA是从哪个ADC通道搬运数据的？