[Porting to ESP8266 Sming]

Finally found an implementation of longjmp() and setjmp() for the Xtensa LX106 cpu. I tested it with the sample code from Wikipedia and got the expected results :-)

I was able to compile µGFX after applying some small changes to the header files. However, I would like to have a better understanding of the BareMetal threading mechanism. The ESP8266 SDK is based on callbacks and no methods should run longer than a few ms at most, otherwise the connectivity may be affected and the watchdog timer will be triggered.

So running a loop like this to keep the µGFX event system running is not an option:

    while(TRUE) {
        gfxSleepMilliseconds(500);
    }  

Could be calling _gfxYield()_ every ms via a timer callback be a better approach?

    static Timer* _timer;
    _timer = new Timer();
    _timer->initializeMs(1, []() {
        gfxYield() );
    }).start();

Or is this not required at all to use µGFXl? Thank you very much for your help!

With kind regards,
Matthias