SGDMA data output issue

Hi BadOmen,

Thanks a lot for your advice. But could you please go in more details about it? I have read the document and the sgdma seems working through the program below. But still how can I send the data to the hardware? Should I wire some pio to the sgdma?

If possible can you show me some diagram/function call to get the data back to the hardware? Thanks!

This is the program:

int main()

{

int i;

// int timeout=0;

for (i=0;i<1000;i++) // buf initialization

buf[i]=i%256;

desc=(alt_sgdma_descriptor *)ONCHIP_MEM_BASE; // redefine the base address ?

// ***************** open sgdma_tx ********************//

sgdma_tx_dev=alt_avalon_sgdma_open(SGDMA_TX_NAME);

if(!sgdma_tx_dev)

{

printf("ERROR: can't open TX SGDMA");

return -1;

}

// ***************** open sgdma_rx ********************//

sgdma_rx_dev=alt_avalon_sgdma_open(SGDMA_RX_NAME);

if(!sgdma_rx_dev)

{

printf("ERROR: can't open RX SGDMA");

return -1;

}

// ***************** reset RX SGDMA ********************//

IOWR_ALTERA_AVALON_SGDMA_CONTROL(SGDMA_RX_BASE,ALTERA_AVALON_SGDMA_CONTROL_SOFTWARERESET_MSK);

IOWR_ALTERA_AVALON_SGDMA_CONTROL(SGDMA_RX_BASE,0x0);

// ***************** reset TX SGDMA ********************//

IOWR_ALTERA_AVALON_SGDMA_CONTROL(SGDMA_TX_BASE,0); // Why these two are different here?

IOWR_ALTERA_AVALON_SGDMA_CONTROL(SGDMA_TX_BASE,0xFF);

// ***************** register rx callback ********************//

alt_avalon_sgdma_register_callback(

sgdma_rx_dev,

(alt_avalon_sgdma_callback) &sgdma_rx_isr, // ?

(alt_u16) ALTERA_AVALON_SGDMA_CONTROL_IE_DESC_COMPLETED_MSK |

ALTERA_AVALON_SGDMA_CONTROL_IE_CHAIN_COMPLETED_MSK |

ALTERA_AVALON_SGDMA_CONTROL_IE_GLOBAL_MSK,

0

);

// ***************** construct a descriptor for ST to MM transfer ********************//

alt_avalon_sgdma_construct_stream_to_mem_desc(

&desc[0],

&desc[1],

rx_payload,

0,

0

);

// ***************** construct a descriptor for MM to ST transfer ********************//

alt_avalon_sgdma_construct_mem_to_stream_desc(

&desc[2],

&desc[3],

(unsigned int*) buf,

(256),

0,

1,

1,

0

);

// ***************** start sgdna_rx ********************//

alt_avalon_sgdma_do_async_transfer(sgdma_rx_dev, &desc[0]);

// ***************** start sgdna_tx ********************//

alt_avalon_sgdma_do_sync_transfer(sgdma_tx_dev, &desc[2]);

}