problem about "axidma_oneway_transfer "

[Monster-Kee]

No problem with write channel when I use the "axidma_oneway_transfer "，but when I use the "axidma_oneway_transfer " for read channel，I read nothing. As the same time,the kernel did not report any error.when I use the "axidma_oneway_transfer " for write channel,the ILA on the PL side can correctly capture,but the read channel has nothing.

code for read channel:

`

static int transfer_file(axidma_dev_t dev, struct dma_transfer *trans)
{
      int rc;
      // Allocate a buffer for the output file
      trans->output_buf = axidma_malloc(dev, trans->output_size);
      if (trans->output_buf == NULL) {
          rc = -ENOMEM;
          goto free_output_buf;
      }


  // Perform the transfer
  // Perform the main transaction
  rc = axidma_oneway_transfer(dev, trans->output_channel, trans->output_buf,
          trans->output_size, true);

  if (rc < 0) {
      fprintf(stderr, "DMA transaction failed.\n");
      goto free_output_buf;
  }

  // Write the data to the output file
  printf("reading....\n");

  free_output_buf:
      axidma_free(dev, trans->output_buf, trans->output_size);

      return rc;
 }


int main(int argc, char **argv)
{
      int rc;
      char *output_path;
      axidma_dev_t axidma_dev;
      struct dma_transfer trans;
      const array_t *rx_chans;

     // Parse the input arguments
      memset(&trans, 0, sizeof(trans));
      if (parse_args(argc, argv, &output_path, &trans.output_channel,&trans.output_size) < 0) {
          rc = 1;
          goto ret;
      }

  // Try opening the input and output images
  trans.output_fd = open(output_path, O_WRONLY|O_CREAT|O_TRUNC,
                   S_IWUSR|S_IRUSR|S_IRGRP|S_IWGRP|S_IROTH);
  if (trans.output_fd < 0) {
      perror("Error opening output file");
      rc = -1;
      goto close_output;
  }
  // Initialize the AXIDMA device
  axidma_dev = axidma_init();
  if (axidma_dev == NULL) {
      fprintf(stderr, "Error: Failed to initialize the AXI DMA device.\n");
      rc = 1;
      goto close_output;
  }

  // Get the tx and rx channels if they're not already specified
  rx_chans = axidma_get_dma_rx(axidma_dev);
  if (rx_chans->len < 1) {
      fprintf(stderr, "Error: No receive channels were found.\n");
      rc = -ENODEV;
      goto destroy_axidma;
  }
      /* If the user didn't specify the channels, we assume that the transmit and
   * receive channels are the lowest numbered ones. */
  if (trans.output_channel == -1 ) {
      trans.output_channel = rx_chans->data[0];
  }
  printf("AXI DMA File Transfer Info:\n");
  printf("\tReceive Channel: %d\n", trans.output_channel);
  printf("\tOutput File Size: %.2f MiB\n\n", BYTE_TO_MIB(trans.output_size));

  // Transfer the file over the AXI DMA
  rc = transfer_file(axidma_dev, &trans);
  rc = (rc < 0) ? -rc : 0;

destroy_axidma:
      axidma_destroy(axidma_dev);
close_output:
     assert(close(trans.output_fd) == 0);
ret:
    return rc;

}

`