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Having written a function to read a PGM image, how do we use it? Well, the testbench at the bottom of the pgm vhdl file has an example: variable i : pixel\_array\_ptr; -- Without the transpose function, we would have to …
Having set up a library for reading images, let’s now go on to read an image in! pgm_read Recall, we have a function: impure function pgm_read (filename : string) return pixel_array_ptr; So, some declarations - …
Data storage One of the things VHDL can do (contrary to popular belief :)) is 2-D arrays. So reading images into a 2-D array is a very natural way to store the data. We’ll create a package called pgm to keep all …
procedure assert_equal ( prefix'event : string; got, expected : integer; level : severity_level := error) is begin assert got = expected report prefix & " wrong. Got " & integer'image(got) & …
It’s been very kindly pointed out to me via email (by Tricky) that I was talking complete rubbish saying that VHDL is rubbish at 2d arrays. What I should’ve said was “VHDL is rubbish at arrays of other …