Posted on May 17, 2011 at 13:33slawcus, I think blackfin is really too big a hammer to crack this nut. The objective is to scale down a video feed into a vague impression of the colours top, bottom and sides of the frame to create background illumin...
Posted on May 17, 2011 at 13:33Quote:On 06-12-2009 at 16:19, edison wrote: You can use overlapped mode (two DMA channels running from same port to RAM, different buffers) and you achieve ~10.1 Mtransf./s @ 72 MHz. Perhaps if I clock the data into ex...
Posted on May 17, 2011 at 13:33Thanks edison - that does square with my findings (and the datasheet :-? ). This is bad news though as I was hoping to transfer 16-bit ITU−R BT.656 video @13.5 Mtransf./s (skipping lines to make time for processing tha...
Posted on May 17, 2011 at 13:33Well, I put all my assumptions to the test again today and found one very serious shortcoming - my external 8MHz crystal wasn't oscillating! The internal clock set up by the Bootloader was still going - 9x slower than ...
Posted on May 17, 2011 at 13:33To show what's happening I've changed the DMA mode to circular and let the buffer fill. After a short while the DMA is disabled and some of the buffer is read out. Here's some cut'n'paste showing the sequence @ 400KHz ...
