Arty VGA Output from MicroBlaze
Updated: Dec 13, 2021
Continuing from my post FPGA VGA for 6502: Brainstorming... I am trying to find a decent solution to control VGA output from MicroBlaze. I am using an Arty A7-100T with the VGA Pmod. I haven't had much luck in finding useful MicroBlaze examples for an Arty configuration. The example that seems to be closest to what I'm trying to do is Zybo VGA Output. Should I be able to adapt this to an Arty? I've been trying, but so far, no video output with this setup. There are a lot of places where this can fall off the rails, so if you catch an error in my setup, please let me know. Here's the current block design:
Below is Vitis code that builds, runs without error, but produces no video output. To get it to build, I have temporarily set the MAX_FRAME to 160*120, instead of 640*480. Also, I have set the number of frames at one, instead of three. If I try 640*480, I run out of memory. See the next image for the build error.
Here's the memory configuration I am using. It seems I am unable to increase the SLMB memory for dlmb or ilmb. See the error (when I try to increase either) further down.
I updated the linker script in Vitis to move data sections to the DDR RAM. This took care of the MicroBlaze build issue.
With this, I configured the MicroBlaze code for an output resolution of 640x480 and tested it. Happiness!
Updated to 800x600 @ 60 Hz, with MicroBlaze-driven animation.
Now, on to adding drawing and font capabilities, along with gathering external input...