Can I use / share the SPI pins used by the onboard SPI flash?
Posted: Mon May 28, 2018 9:06 pm
Since I do not have may spare pins or might not even have enough, I'm looking into ways to possibly save some pins, using the Arduino Environment.
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:
Unfortunately this crashes the ESP32! 
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!
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:
Code: Select all
//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!