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| 0105-2023-06-29.md | 0107-2023-07-02.md |
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With the circle-cursor generator running on PicoDeo, a telltale sign of the behaviour we want to get rid of is that sometimes the cursor appears as a long arc, or as a flattened parallelogram.
This means that the cursor reference point is changing through each scanline, without the design having a registered reference. Otherwise, the cursor would appear as a square.
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I've noticed ways to more-easily see glitching on the vga_cursor raw GPIO inputs:
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Half-unplug the PicoDeo while circle-cursor is running.
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Just pull out the PicoDeo and touch the header pins with my finger.
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Doing it this way I think creates more uncertainty on some inputs, and picks up other interference, which means a much less stable input signal (which is what we want).
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Hence, our goal is to make THAT "work", i.e. always present nothing but a square cursor, even if it is skipping around the screen randomly.
