Imports periph.io/x/periph periph.io/x/periph/conn/gpio periph.io/x/periph/conn/pin periph.io/x/periph/conn/pin/pinreg periph.io/x/periph/host/beagle/black periph.io/x/periph/host/beagle/green periph.io/x/periph/host/sysfs Standard library imports errors