Created
July 19, 2016 14:45
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Using GPIO pins with GoLang
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package main | |
import "os" | |
import "io/ioutil" | |
import "time" | |
type GPIO struct{} | |
func (r GPIO) Pin(name string) GPIO_Pin { | |
pin := GPIO_Pin{name} | |
filename := pin.Filename() | |
if _, err := os.Stat(filename); os.IsNotExist(err) { | |
// export gpio pin | |
ioutil.WriteFile("/sys/class/gpio/export", []byte(pin.Name), 0666) | |
} | |
return pin | |
} | |
type GPIO_Pin struct { | |
Name string | |
} | |
func (r GPIO_Pin) Filename() string { | |
return "/sys/class/gpio/gpio" + r.Name | |
} | |
func (r GPIO_Pin) write(where, what string) GPIO_Pin { | |
filename := r.Filename() + "/" + where | |
ioutil.WriteFile(filename, []byte(what), 0666) | |
return r | |
} | |
func (r GPIO_Pin) Output() GPIO_Pin { | |
return r.write("direction", "out") | |
} | |
func (r GPIO_Pin) Input() GPIO_Pin { | |
return r.write("direction", "in") | |
} | |
func (r GPIO_Pin) High() GPIO_Pin { | |
return r.write("value", "1") | |
} | |
func (r GPIO_Pin) Low() GPIO_Pin { | |
return r.write("value", "0") | |
} | |
func main() { | |
pins1 := []string{"26", "19", "13", "6"} | |
pins2 := []string{"24", "23", "18", "25", "12", "16", "21", "20"} | |
i := 0 | |
gpio := GPIO{} | |
for i < 1600 { | |
i1 := (i) % len(pins1) | |
gpio.Pin(pins1[i1]).Output().Low() | |
i2 := (i) % len(pins2) | |
gpio.Pin(pins2[i2]).Output().Low() | |
i3 := (i + 4) % len(pins2) | |
gpio.Pin(pins2[i3]).Output().Low() | |
time.Sleep(200 * time.Millisecond) | |
gpio.Pin(pins1[i1]).High() | |
gpio.Pin(pins2[i2]).High() | |
gpio.Pin(pins2[i3]).High() | |
i++ | |
} | |
} |
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