SPI performance on mono SSH1106 128x64 screen - bulk SPI transfer

Thanks @allObjects, your post gave me a clue to look at how the graphics array is allocated and it is in a flat data area, so I now use a simple memcpy at the start of my native "flip" routine to copy it to the DMA-capable transfer buffer. Profligate use of precious memory I know... but it does mean I can use the existing Graphics and the only custom part is the flip.

I now have a little Javascript app drawing and moving 16 rects and total execution time is around 35ms, ie. 28fps. Even this was interesting as I found things like rects.forEach(r => {g.drawRect(...)}), rather than a simple for loop based on rects.length added about 5ms per redraw.

Breadboard pic for interest...

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