zapta
commented
3 years ago Display performance was an important part of the design and I went through a few iterations. SPI would be the easiest since its' supported by DMA which will allow rendering in memory and sending to the display at the same time. However, the ILI9488 datasheet specifies max SPI speed of ~15Mhz which is about 1M pixels/sec. (16 bits each). With the parallel interface the analyzer archives about 10M pixels/secs, including color mapping from 8 bit pixels in memory (to save RAM) to 16 bit pixels required by the ILI9488.
You are right about the potential for derivative projects, e.g. cutting cost using a display-less unit that connects to a phone or a computer via USB (sensors are galvanically isolated so should be safe) or BLE. Another option is to have a board that supports multiple sensors (e.g. to determine x/y/z of a delta or corexy printer). You can see this design as a proof of concept that hopefully inspire ideas and products.
On Fri, Apr 23, 2021 at 9:13 AM phil-barrett @.***> wrote:
What kind of performance do you need from the display? Since you went with a parallel interface, I assume that you need fast updates. There are lots of inexpensive displays that use SPI - too slow for your needs?
By the way, I am posting in Issues though these aren't really "issues". If you turned on Discussions - I would put them there. I think your project has a lot of potential for derivative projects and variant hardware. Perhaps Discussions would be a better place to talk about that?
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What kind of performance do you need from the display? Since you went with a parallel interface, I assume that you need fast updates. There are lots of inexpensive displays that use SPI - too slow for your needs?
By the way, I am posting in Issues though these aren't really "issues". If you turned on Discussions - I would put them there. I think your project has a lot of potential for derivative projects and variant hardware. Perhaps Discussions would be a better place to talk about that?