thanks dlim for your tip, but can you be more specific as I did not find in which ip core i can find how to use alt_video_dma_draw function as it is a bit different in quartus 18.1 version. To be more precise I am reading an .hex image initialised in an on chip memory in nios2, but the data I am getting is different from the data contained in the .hex file. I am investigating this function that draw pixels in vga screen which is not displaying the right image.
I am quit happy to provide you with more details about the quartus project i am using if you need them. thanks
Hi dlim,thanks for your last reply,
I am using Quartus v18.1, in fact I can use other functions an data are correctly displayed on the screen (like alt_up_pixel_buffer_dma_clear_screen(), and alt_up_pixel_buffer_dma_draw_hline() ).
my problem is that thae data I am reading from the onchip memory are not the actual data, am I missing something ? (like addressing configuration or something).
the .hex file is attached to have an idea (which is an image).
I can provide other information if needed. thanks