Seemingly out of the blue my Digole 128x64 Oled has started outputting 'oc4' in a box instead of spaces in text strings. In addition to that all variables printed to the screen are output as '?#+' or similar instead. The below:
Should be displaying as:
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I get the same issue whatever sketch I upload, including the standard Digole sketches - does that point to it being an issue with the screen driver firmware maybe? It's puzzling that variables cause a problem but hard coded text strings work fine...
Also, lines, shapes, animations etc all work fine too, the problem is limited to variables and spaces.
I emailed Digole and they said to try uploading a stock sketch - and if that didn't work (which it didn't), to return the screen for a replacement. There must be a way to reset the screen to its original settings, but I'm not sure how that's done?
Any thoughts and suggestions welcome!