Honored Contributor
Honored ContributorI will continue with the rest of the code and the questions here.
This was the first function i made, because in the future project in hich I want to use DMA I think i will need integers.
void
int_tx_rx()
{
int send={1,2,3,4,5,6,7,8,9,10,11,12};
int length=sizeof(send)/sizeof(int);
printf("length=%i\n", length);
int rc;
alt_dma_txchan txchan;
alt_dma_rxchan rxchan;
void* rx_buffer = (void*) (ONCHIP_MEMORY2_1_BASE); /* pointer to rx buffer */
/* Create the transmit channel */
if ((txchan = alt_dma_txchan_open("/dev/dma_0")) == NULL)
{
printf ("Failed to open transmit channel\n");
exit (1);
}
else
{
if( alt_dma_txchan_ioctl(txchan,ALT_DMA_SET_MODE_32,NULL) <0 )
printf("failed to set RX_MODE_32\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
{
if( alt_dma_rxchan_ioctl(rxchan,ALT_DMA_SET_MODE_32,NULL) <0)
printf("failed to set TX_MODE_32\n");
}
/* Post the receive request */
if ((rc = alt_dma_rxchan_prepare (rxchan,rx_buffer,length*sizeof(int),done_rx,NULL)) < 0)
{
printf ("Failed to post read request, reason = %i\n", rc);
exit (1);
}
/* Post the transmit request */
if ((rc = alt_dma_txchan_send (txchan,send,length*sizeof(int),done_tx ,NULL)) < 0)
{
printf ("Failed to post transmit request, reason = %i\n", rc);
exit (1);
}
/* wait for transfer to complete */
while (!rx_done);
printf("send \n");
int i;
for(i=0;i<length;i++)
printf ("%i \r",send);
int *p;
//p=(void*) ONCHIP_MEMORY2_1_BASE;
p=rx_buffer;
printf("\nreceived \n");
for(i=0;i<length;i++)
printf ("%i \r",*(p+i));
alt_dma_rxchan_close(rxchan);
alt_dma_txchan_close(txchan);
}
