help with simple memory testing example on niosII

Altera_Forum · ‎04-20-2010

hi all,

im just a beginner trying to run memory test example code provided in nios EDS.

What ive wanted to do is simply running a test on SDRAM (with dma). Ive configure the SOPC with SDRAM & dma controller. The screenshot of my sopc is shown below:

https://www.alteraforum.com/forum/attachment.php?attachmentid=2385

While running the c code example, the program pass all the test but stay still when it comes to "testing memory using dma". I ran it again in debug mode and put breakpoints in certain places. What i found out is that it never get out of while(!rx_done). It seems like the dma transfer is never completed and rx_done is always 0.

Here is the code snippet of the memory test (consist only the function called for dma test)

/******************************************************************
*  Function: dma_done
*
*  Purpose: Called when a DMA recieve transaction is complete.
*           Increments rx_done to signal to the main program that
*           the transaction is done.
*
******************************************************************/# ifdef DMA_NAME  
static void dma_done (void* handle, void* data)
{
  rx_done++;
}# endif /* DMA_NAME */  
/******************************************************************
*  Function: MemDMATest
*
*  Purpose: Tests every bit in the memory device within the 
*  specified address range using DMA.  The DMA controller provides 
*  a more rigourous test of the memory since it performs back-to-
*  back memory accesses at full system speed.
*
******************************************************************/# ifdef DMA_NAME  
static int MemDMATest(unsigned int memory_base, unsigned int nBytes)
{
  int rc;
  int ret_code = 0;
  int pattern, offset;
  alt_dma_txchan txchan;
  alt_dma_rxchan rxchan;
  void* data_written;
  void* data_read;
  
  /* Get a couple buffers for the test */
  data_written = (void*)alt_uncached_malloc(0x1000);
  data_read = (void*)alt_uncached_malloc(0x1000);
  
  
  /* Fill write buffer with known values */
  for (pattern = 1, offset = 0; offset < 0x1000; pattern++, offset+=4)
  {
    IOWR_32DIRECT((int)data_written, offset, pattern);
  }
  /* Create the transmit channel */
  if ((txchan = alt_dma_txchan_open("/dev/dma")) == NULL)
  {
    printf ("Failed to open transmit channel\n");
    exit (1);
  }
  
  /* Create the receive channel */
  if ((rxchan = alt_dma_rxchan_open("/dev/dma")) == NULL)
  {
    printf ("Failed to open receive channel\n");
    exit (1);
  }
  
  for(offset = memory_base; offset < (memory_base + nBytes); offset += 0x1000)
  {
    /* Use DMA to transfer from write buffer to memory under test */
    /* Post the transmit request */
    if ((rc = alt_dma_txchan_send (txchan, data_written, 0x1000, NULL, NULL)) < 0)
    {
      printf ("Failed to post transmit request, reason = %i\n", rc);
      exit (1);
    }
    /* Post the receive request */
    if ((rc = alt_dma_rxchan_prepare (rxchan, (void*)offset, 0x1000, dma_done, NULL)) < 0)
    {
      printf ("Failed to post read request, reason = %i\n", rc);
      exit (1);
    }
  
    /* Wait for transfer to complete */
    while (!rx_done);
    rx_done = 0;
    
    /* Clear the read buffer before we fill it */
    memset(data_read, 0, 0x1000);
    
    /* Use DMA to read data back into read buffer from memory under test */
    /* Post the transmit request */
    if ((rc = alt_dma_txchan_send (txchan, (void*)offset, 0x1000, NULL, NULL)) < 0)
    {
      printf ("Failed to post transmit request, reason = %i\n", rc);
      exit (1);
    }
    /* Post the receive request */
    if ((rc = alt_dma_rxchan_prepare (rxchan, data_read, 0x1000, dma_done, NULL)) < 0)
    {
      printf ("Failed to post read request, reason = %i\n", rc);
      exit (1);
    }
    /* Wait for transfer to complete */
    while (!rx_done);
    rx_done = 0;
    
    if (memcmp(data_written, data_read, 0x1000))
    {
      ret_code = offset;
      break;
    }
  }
  alt_uncached_free(data_written);
  alt_uncached_free(data_read);
  return ret_code;
}# endif /* DMA_NAME */

can u guys advice anything that ive done wrong?maybe setting in the sopc.the connection in sopc or something. im a little confuse right now because this is suppose to be a simple memory test which i only use an example provided code in niosIDE :confused:. Any help is appreciated. Thanks~

Im currently using

Altera Quartus II v8.0, Nios IDE v8.0