Video waveform monitor

[jpa]

@Hfuy

I do worry slightly about the performance; is this compiled to a native executable, or are you running some sort of interpreter on the DSO’s Arm?

Yeah, it is interpreted… about 4-10x slower than native. On the other hand the slowest parts such as display drawing and wave capture are written in C, so the total impact is not as large.

@Hfuy

The big performance issue is that ideally, each video scanline would be written to the display at a low intensity, and additively with whatever comes before. As you can see in my demo image, a waveform monitor is ideally capable of variable intensity display. I’m not sure if it’s capable of doing that many adds. I notice blend(), but I’m not sure how fast it would be to draw entire displays like that at, hopefully, 20-30fps.
Is the hardware even capable of variable intensity graphics, or is it just LUT colour?

Hardware can do variable intensity, 16-bit colors in RGB565 format.

@Hfuy

Would it be better to create this image in memory somewhere and then put it on the display?

It would, but the processor does not have enough RAM. You would have to use some 100 x 50 pixel buffer, which might be accurate enough.

Maybe you could just keep average, min and max?