package gpio import "github.com/kidoman/embd/host" type Direction int const ( In Direction = iota Out ) const ( Low int = iota High ) type DigitalPin interface { Write(val int) error Read() (int, error) SetDirection(dir Direction) error ActiveLow(b bool) error PullUp() error PullDown() error Close() error } type gpio interface { DigitalPin(key interface{}) (DigitalPin, error) Close() error } var instance gpio func Open() error { desc, err := host.Describe() if err != nil { return err } instance = desc.GPIO().(gpio) return nil } func Close() error { return instance.Close() } func NewDigitalPin(key interface{}) (DigitalPin, error) { return instance.DigitalPin(key) } func DigitalWrite(key interface{}, val int) error { pin, err := NewDigitalPin(key) if err != nil { return err } return pin.Write(val) } func DigitalRead(key interface{}) (int, error) { pin, err := NewDigitalPin(key) if err != nil { return 0, err } return pin.Read() } func SetDirection(key interface{}, dir Direction) error { pin, err := NewDigitalPin(key) if err != nil { return err } return pin.SetDirection(dir) } func ActiveLow(key interface{}, b bool) error { pin, err := NewDigitalPin(key) if err != nil { return err } return pin.ActiveLow(b) }