forked from hybridgroup/gobot-beaglebone
/
digital_pin.go
82 lines (70 loc) · 1.58 KB
/
digital_pin.go
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package gobotBeaglebone
import (
"os"
"strconv"
)
type digitalPin struct {
PinNum string
Mode string
PinFile *os.File
Status string
}
const GPIO_PATH = "/sys/class/gpio"
const GPIO_DIRECTION_READ = "in"
const GPIO_DIRECTION_WRITE = "out"
const HIGH = 1
const LOW = 0
func newDigitalPin(pinNum int, mode string) *digitalPin {
d := new(digitalPin)
d.PinNum = strconv.Itoa(pinNum)
fi, err := os.OpenFile(GPIO_PATH+"/export", os.O_WRONLY|os.O_APPEND, 0666)
if err != nil {
panic(err)
}
fi.WriteString(d.PinNum)
fi.Close()
d.setMode(mode)
return d
}
func (d *digitalPin) setMode(mode string) {
d.Mode = mode
if mode == "w" {
fi, err := os.OpenFile(GPIO_PATH+"/gpio"+d.PinNum+"/direction", os.O_WRONLY, 0666)
if err != nil {
panic(err)
}
fi.WriteString(GPIO_DIRECTION_WRITE)
fi.Close()
d.PinFile, err = os.OpenFile(GPIO_PATH+"/gpio"+d.PinNum+"/value", os.O_WRONLY, 0666)
if err != nil {
panic(err)
}
} else if mode == "r" {
fi, err := os.OpenFile(GPIO_PATH+"/gpio"+d.PinNum+"/direction", os.O_WRONLY, 0666)
if err != nil {
panic(err)
}
fi.WriteString(GPIO_DIRECTION_READ)
fi.Close()
d.PinFile, err = os.OpenFile(GPIO_PATH+"/gpio"+d.PinNum+"/value", os.O_RDONLY, 0666)
if err != nil {
panic(err)
}
}
}
func (d *digitalPin) digitalWrite(value string) {
if d.Mode != "w" {
d.setMode("w")
}
d.PinFile.WriteString(value)
d.PinFile.Sync()
}
func (d *digitalPin) close() {
fi, err := os.OpenFile(GPIO_PATH+"/unexport", os.O_WRONLY|os.O_APPEND, 0666)
if err != nil {
panic(err)
}
fi.WriteString(d.PinNum)
fi.Close()
d.PinFile.Close()
}