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I'll recommend to you to see the section called "Developing Programs Using the Hardware abstraction Layer" in the "NIOS II software developer's handbook.
for work with DMA you'll need to use the functions within sys/alt_dma.h.
It shouldn't be very complex to do this
Which hardware are you using???
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well I am a little curious about what you did and how the edge detection codes were written. Guess as I previously said, I tried using the DSP builder in Simulink to build the prewitt co processor, did u also do the same. if you could just brief on what were the next stages that I might have to go through.
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