Hi guys, I have a smart6818 and nanopi fire 3 motherboard. I am writing a GPIO kernel module to control the GPI O pins, but I am not compiling the module. I am creating a Makefile but the device is giving the following error. """ make -C /lib/modules/4.4.172-s5p6818/build M=/home/pi/k...

I had the opportunity to try uart, i2c and gpio in Linux versions. But I only had problems with gpio. If you are going to use gpio for basic operations, you can use the sysfs technique. Otherwise, it seems very difficult to use existing libraries. I tried to configure some libraries but stopped mess...