Imports periph.io/x/periph/conn/pin periph.io/x/periph/host/allwinner periph.io/x/periph/conn/gpio/gpioreg periph.io/x/periph/host/distro periph.io/x/periph/host/fs periph.io/x/periph/conn/pin/pinreg periph.io/x/periph periph.io/x/periph/conn/gpio Standard library imports errors fmt io/ioutil os path/filepath strconv strings