我的DMA程序也陷入死循环，请您知道一下！
#define TRANSFER_LENGTH 3367;
static volatile int dma_complete = 0;
void dma_done (void* handle){
dma_complete = 1;
}
int main(void)
{
int rc;
alt_dma_txchan txchan;
alt_u8* tx_data = nararray0[0];

/*Create the transmit channel*/

if((txchan = alt_dma_txchan_open("/dev/dma")) == NULL)
{
printf ("Failed to open transmit channel\n");
exit(1);
}
else
{
printf ("Create the transmit channel successfully!\n");
}

//post the transmit request
if((rc = alt_dma_txchan_send(txchan,
tx_data,
TRANSFER_LENGTH,
done,
NULL)) < 0)
{
printf ("Failed to post transmit request, reason = %i\n", return_code);
exit (1);
}
else
{
printf ("Post the transmit request successfully!\n");
}
while(!dma_complete);
printf("Transfer sucessful!\n");
return 0;
}

它一直执行while(!dma_complete);陷入死循环，希望高手能够指点一下！！