I wrote a program to decode images and want it to run on ADSP BF-533, but don't have enough experience to do this well.
So my C++ program works, but too slow.
First problem I faced was mmemory allocation. Construction new int[512*512] made processor jump to idle state, which seems not to allocate this memory size. I tryed malloc(...) but it returnes zero.
So the way I have found was just addressing the memory without allocation. So it works like this:
unsigned char *BufPtr = NULL;
BufPtr += 0x65400;
BufPtr = 0;
BufPtr = 1;
No errors, everything seems ok, except the way it is done and the time program takes. Just arithmetical operations take 0.18 ms. When I add memory reading, it takes approximately the same time. But when I start to write to this unallocated memory, the same process takes 500 ms!!! That's a way too much.
I looked through documentation, in the web, on this site in particular, but haven't found a clear answer. I guess it is too obvious for the people working with DSP, but I'm a newby and haven't got a solution yet.
I atached the simplified code I test right now to solve the time problem. I walked through all SDRAM initializations in Project Propertyes and examples, but still can't find a way out.
Could you please help me!