validate_results.c

DMA exmaple,网路上找到的DMA程式范例

#include "stdio.h"
#include "stdlib.h"
#include "io.h"
#include "alt_types.h"
#include "altera_avalon_sgdma.h"


/**********************************************************************************
 * This function returning nothing since it's going to print errors to the        *
 * console. It is responsible for freeing the memory allocated for each buffer    *
 * location previously allocated.                                                 *
 **********************************************************************************/
void validate_results(alt_sgdma_descriptor * transmit_descriptors,
                      alt_sgdma_descriptor * receive_descriptors,
                      alt_u32 number_of_buffers)
{
  alt_u32 buffer_counter, contents_counter, temp_length, failure = 0;
  alt_u32 * transmit_ptr, * receive_ptr;
  alt_u8 temp_transmit, temp_receive;

  /* loop through each descriptor */  
  for(buffer_counter = 0; buffer_counter < number_of_buffers; buffer_counter++)
  {
    transmit_ptr = transmit_descriptors[buffer_counter].read_addr;
    receive_ptr = receive_descriptors[buffer_counter].write_addr;
    temp_length = transmit_descriptors[buffer_counter].bytes_to_transfer;
    
    /* loop through each buffer to check the contents on each byte */
    for(contents_counter = 0; contents_counter < temp_length; contents_counter++)
    {
      temp_transmit = IORD_8DIRECT((alt_u32)transmit_ptr, contents_counter);
      temp_receive = IORD_8DIRECT((alt_u32)receive_ptr, contents_counter);
      if(temp_transmit != temp_receive)
      {
        printf("Error, sent %u, received %u, buffer: %u, index: %u\n", (unsigned int)temp_transmit, (unsigned int)temp_receive, (unsigned int)(buffer_counter+1), (unsigned int)contents_counter); 
        failure = 1;
      }
    }
    
    /* Done with these two, time to clean up after ourselves. */
    free(transmit_ptr);
    free(receive_ptr);    
  }

  if(failure == 0)
  {
    printf("The entire data transfer finished error free.\n");
  }

}

/******************************************************************************
*                                                                             *
* License Agreement                                                           *
*                                                                             *
* Copyright (c) 2007 Altera Corporation, San Jose, California, USA.           *
* All rights reserved.                                                        *
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*                                                                             *
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*                                                                             *
* This agreement shall be governed in all respects by the laws of the State   *
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******************************************************************************/