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Altera_Forum
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15 years ago

I have a problem about the sgdma when I used it to transfer vga data(800x600x4bytes)!

Hi, Just as the title describes,I wanna to use the SGDMA to tranfer VGA data which has much of data(800x600x4bytes=1920000bytes).SGDMA is configured to Memory to Streaming mode , the descripto...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Are You sure You're not filling the invisible data of the display? Is it tft matrix only? Also do You use write until EOP or a fixed length?

Did You allocate enough memory for data pointer? Descriptor memory takes 32 bytes long data in the memory. If You're allocating descriptor memory with malloc(), then it is placed in heap, which I suppose is in the SDRAM? However I don't know if it would actually work that way.