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Altera_Forum
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15 years ago

alt_avalon_sgdma_construct_mem_to_mem_desc()

hi: "alt_avalon_sgdma_construct_mem_to_mem_desc()"can only transmit the number of data smaller than 65535 bytes ,so if I want to transmit data which the number is larger than 65535，how I...
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Altera_Forum
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15 years ago

Use the modular SGDMA available on altera.com. Just search for modular dma.

Or, do what you are doing, but you can only initiate the transfer after all the descriptors are created. Then

alt_avalon_sgdma_do_sync_transfer(sgdma_sdram, &desc[0]);

The reason the second call fails, is the first transaction has to complete the way you are calling it.

--dalon