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You could have a cache problem. The CPU could be reading its data cache instead of the buffer in memory.
Try to create a second pointer:
alt_u8 *uncached_buffer = alt_remap_uncached(buffer,DEPTH);
and when you print the contents of the buffer, read the data with uncached_buffer[x], and see if you have different results.
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alt_u8 *uncached_buffer = alt_remap_uncached(buffer,depth);
gave compile error : invalid conversion from `volatile void*' to `alt_8*'
so i change it to
volatile void * uncached_buffer = alt_remap_uncached(buffer,depth);
but now the "uncached_buffer" variable cannot be read.
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