Can anybody help me?

[Altera_Forum]

Hi All, 

I am testing DMA in my project, but when compiling the c kode, i get some Errors i dont understand.  error: `ALT_IRQ_NOT_CONNECTED&#39; undeclared (first use in this function)[system_description/alt_sys_init.c]  the file alt_dev.h contains a line:# define ALT_IRQ_NOT_CONNECTED (-1)  Can anybody help me?  my c kode is shown below: # include "ALTERA_AVALON_PIO_REGS.H"# include <stdio.h># include <stddef.h># include <stdlib.h># include "system.h"# include <alt_dev.h># include "alt_types.h"# include "sys/alt_dma.h"  /* Global DMA "transaction finished" flag */   volatile int rx_done = 0; static volatile long sour[100]; volatile long *pram2= (long*)RAM2_BASE;   unsigned int offset; int rc;    static void dma_done (void* handle, void* data) {  rx_done++; }       static int MemDMATest(unsigned int memory_base, unsigned int nBytes) {  alt_dma_txchan txchan;  alt_dma_rxchan rxchan;        /* Create the transmit channel */  if ((txchan = alt_dma_txchan_open("/dev/dma_0")) == NULL)  {  //printf ("Failed to open transmit channel\n");  exit (1);  }    /* Create the receive channel */  if ((rxchan = alt_dma_rxchan_open("/dev/dma_0")) == NULL)  {  //printf ("Failed to open receive channel\n");  exit (1);  }  //* Use DMA to transfer from write buffer to memory under test */  /* Post the transmit request */  if ((rc = alt_dma_txchan_send (txchan, (void*) sour, sizeof(sour) x sizeof(long) , 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*)pram2 , sizeof(sour) x sizeof(long), 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;    /* 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*)pram2 , sizeof(sour) x sizeof(long), 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*) sour, sizeof(sour) x sizeof(long), 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; }  int main(void)  {  MemDMATest(memory_base, nBytes);   }   return (0);  }   SEMIR

[Altera_Forum]

This probably means that you didn&#39;t connect up the IRQ to one of your peripherals when you ran SOPC builder. Have a look in system.h to find out which one.  

 If this doesn&#39;t help then please post your system.h here.

[Altera_Forum]

It looks like you were close to answering your own question. The file altera_avalon_dma.h is missing the line: 

# include "sys/alt_dev.h"  if you add that in, the error will go away.  Alternatively, you will find that this problem will also disapear if you include either a JTAG_UART or UART in your design (since these drivers will include the missing header for you).