SG-DMA descriptor chain not working.

Hi everyone,

I'm doing SG-DMA for streaming data to LCD.

This is how I do,

SG-DMA memory-to-stream SOPC connection.

{

descriptor read and write-->DDR-SDRAM

read data -->DDR-SDRAM

}

created descriptor using malloc.

descriptor 0:

current descriptor pointer: descriptor[0]

next descriptor pointer: descriptor[1]

SOP(start of package) = 1

EOP(end of package) = 0

descriptor 1:

current descriptor pointer: descriptor[1]

next descriptor pointer: descriptor[0]

SOP(start of package) = 0

EOP(end of package) = 1

PARK MODE ENABLE

so this configuration should introduce a loop chain for the descriptor. However its not working unless i put the loop only inside 1 descriptor(current descriptor pointer: descriptor[0]

next descriptor pointer: descriptor[0]).

I just want to make the data stream continuous base on this 2 descriptor. Is it I lost something??

Thanks for any reply. :o