RM46L852: RM46L852C RMII设计使用hdkif_transmit无法输出

源码：

static void
hdkif_transmit(struct hdkif *hdkif, struct pbuf *pbuf) {
  struct pbuf *q;
  struct txch *txch;
  volatile struct emac_tx_bdp *curr_bd, *active_head, *bd_end;

  txch = &(hdkif->txch);
  /* Get the buffer descriptor which is free to transmit */
  curr_bd = txch->free_head;
 
  active_head = curr_bd;
 
  /* Update the total packet length */
  uint32 flags_pktlen = pbuf->tot_len;
  flags_pktlen |= (EMAC_BUF_DESC_SOP | EMAC_BUF_DESC_OWNER);
  curr_bd->flags_pktlen = hdkif_swizzle_data(flags_pktlen);

  /* Copy pbuf information into TX buffer descriptors */
  for(q = pbuf; q != NULL; q = q->next) {

    /* Intialize the buffer pointer and length */
    curr_bd->bufptr = hdkif_swizzle_data((uint32)(q->payload));
    curr_bd->bufoff_len = hdkif_swizzle_data((q->len) & 0xFFFF);
    bd_end = curr_bd;
    curr_bd->pbuf = pbuf;
    curr_bd = hdkif_swizzle_txp(curr_bd->next);
    //if (curr_bd) curr_bd->flags_pktlen = 0;
  }

  /* Indicate the end of the packet */
  bd_end->next = NULL;
  bd_end->flags_pktlen |= hdkif_swizzle_data(EMAC_BUF_DESC_EOP);
 
  txch->free_head = curr_bd;
 
  /* For the first time, write the HDP with the filled bd */
  if(txch->active_tail == NULL) {
    EMACTxHdrDescPtrWrite(hdkif->emac_base, (unsigned int)(active_head), 0);
  }
 
  /*
   * Chain the bd's. If the DMA engine, already reached the end of the chain,
   * the EOQ will be set. In that case, the HDP shall be written again.
   */
  else {
    curr_bd = txch->active_tail;
    /* TODO: (This is a workaround) Wait for the EOQ bit is set */
    while (EMAC_BUF_DESC_EOQ != (hdkif_swizzle_data(curr_bd->flags_pktlen) & EMAC_BUF_DESC_EOQ));
    /* TODO: (This is a workaround) Don't write to TXHDP0 until it turns to zero */
      while (0 != *((uint32 *)0xFCF78600));
    curr_bd->next = hdkif_swizzle_txp(active_head);
    if (EMAC_BUF_DESC_EOQ == (hdkif_swizzle_data(curr_bd->flags_pktlen) & EMAC_BUF_DESC_EOQ)) {
      /* Write the Header Descriptor Pointer and start DMA */
      EMACTxHdrDescPtrWrite(hdkif->emac_base, (unsigned int)(active_head), 0);
    }
  }

  txch->active_tail = bd_end;
}

您好，

      感谢您对TI产品的关注！
      为更加有效地解决您的问题，我们建议您将问题发布在E2E英文技术论坛上（e2e.ti.com），将由资深的英文论坛工程师为您提供帮助。