FriendlyELEC-Forum

I've got a NanoPi64 and made it run the Ubuntu core from nanopi-a64_friendlycore-xenial_3.10.65_20180207.img
I need to communicate with devices plugged on SPI bus on the GPIO pins 19/21/23 and 24/26.
Which API is available ?

I previously developped on RPi with the BCM2835 C library http://www.airspayce.com/mikem/bcm2835/
but I could use any C library.

Thanks !

I'm looking at the /sys/class/gpio because I've not found anything better.
But how to know which gpio number map to the NanoPi-A64 GPI header pins ?