void init_dma (void)
{
    /* Create the transmit channel */
      if ((txchan = alt_dma_txchan_open("/dev/dma_0")) == NULL)
     {
       printf ("Failed to open transmit channel\n");
       //exit (1);
       }
      else printf ("Open transmit channel.. success\n");
       /* Create the receive channel */
       if ((rxchan = alt_dma_rxchan_open("/dev/dma_0")) == NULL)
       {
         printf ("Failed to open receive channel\n");
       //  exit (1);
       }
       else printf ("Open receive channel.. success\n");
       alt_dma_rxchan_ioctl(rxchan, ALT_DMA_SET_MODE_32, 0);
       alt_dma_txchan_ioctl(txchan, ALT_DMA_SET_MODE_32, 0);
}

int dma_send (void* from, void* to, alt_u32 length)
{
    int dma_ret;
    if ((dma_ret = alt_dma_txchan_send (txchan,
            from,
            length,
            NULL,
            NULL)) < 0)
       {
       printf ("Failed to post transmit request, reason = %i\n", dma_ret);
       return 1;
       }
   if ((dma_ret = alt_dma_rxchan_prepare (rxchan,
               to/*rx_buffer*/,
            length,
            done,
            NULL)) < 0)
       {
       printf ("Failed to post read request, reason = %i\n", dma_ret);
       return 2;
       }
       /* wait for transfer to complete */
       while (!rx_done);
       printf ("Transfer successful!\n");
       rx_done--;
       printf ("rx_done = %u\n", (unsigned int) rx_done);
       return 0;
}

void ram2ram (void* tx_data_num, void* ram_data){   // передать тестовый пакет в onchip_memory2_1
    int dma_trans = 0;
    dma_trans = dma_send(tx_data_num, ram_data, TR_SZ);
        if (dma_trans){
            printf("result of operation is %u\n", (unsigned int) dma_trans);
        }
        else printf("ram2ram transfer succeed\n");
}

void ram2check (void* rx_buffer_check, void* ram_data){ // забрать пакет из onchip_memory2_1 в проверочную область и вывести в консоль
    int dma_trans = 0;
    int i;
    dma_trans = dma_send(ram_data, rx_buffer_check, TR_SZ);
        if (dma_trans){
                printf("result of operation is %u\n", (unsigned int) dma_trans);
            }
        else {
            printf("ram2check transfer succeed\n");
            printf ("rx_buffer_check:\n");
                    for (i = 0; i < TR_SZ/sizeof(int); i++)
                        printf("%u: %u\n",i,((unsigned int *) rx_buffer_check)[i]);
        }
}

int main (void)
{

  int i;
  int my_reg = 0;
  int my_val = 5;
void* tx_data_num =  (void*) alt_uncached_malloc(TR_SZ);  // указатель на начало тестового пакета
void* rx_buffer_check = (void*) alt_uncached_malloc(TR_SZ); // указатель на начало проверочного пакета
void* ram_data = (void*) 0x44000; // указатель на ONCHIP_MEMORY2_1_BASE

    for (i = 0; i < TR_SZ/sizeof(int); i++) // инициализация тестового пакета
       ((int *) tx_data_num)[i] = i;

    printf ("  ----====  APPLICATION START  ====----\n");

    init_dma();

    ram2check(ram_data, rx_buffer_check); // загрузить пакет из onchip_memory2_1 в проверочный,
                                                                 //printf(rx_buffer_check)

    print_num (tx_data_num);                    //printf(tx_data_num)
    ram2ram(tx_data_num, ram_data);       // загрузить тестовый пакет в начало onchip_memory2_1
    ram2check(ram_data, rx_buffer_check); // см. выше

    printf ("  ----====  APPLICATION FINISH  ====----\n");
    printf("tx_data_num = %x\n",(unsigned int)tx_data_num);
    printf("rx_buffer_check = %x\n",(unsigned int)rx_buffer_check);
    printf("ram_data = %x\n",(unsigned int)ram_data);

    for (i=0; i<4;i++){                          //а вот такой подход через макросы IOWR/IORD работает без помех
        setparam(my_reg+i,my_val+i);
        if ((int)getparam(my_reg+i)==my_val+i)
                        printf("Reg %d check success!!!\n",i+1);
                    else
                        printf("Reg %d check fail...\n",i+1);
    }

    return 0;
}