As far as I know, the onboard SPI flash IC operates via "normal" SPI, thus it should be possible to connect other devices onto the bus (MISO, MOSI and SCK shared).
I've tried to figure out which pins correspond to these aforementioned ones.
I came up with this:
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//SPI.begin(SCK, MISO, MOSI, SS);
SPI.begin(6, 7, 8, 11); //Custom, Pin would need to be changed, tried it, it's not the reason for the crash
//SPI.begin(18, 19, 23, 5); //"Normal"
The attached image shows which range of pins I'd like to use. It should be possible to "map" SPI to any set of pins, is it true for those marked? Can at least some of these pins be used as non-SPI IO?
I'd greatly appreciate any help!