func newButtons(redN, greenN int) (*buttons, error) {
var red, green gpio.Pin
var err error
if red, err = gpio.OpenPin(redN, gpio.ModeInput); err != nil {
return nil, err
}
if green, err = gpio.OpenPin(greenN, gpio.ModeInput); err != nil {
_ = red.Close()
return nil, err
}
btns := &buttons{
Presses: make(chan Button, 10),
red: util.Debounced(red, 20*time.Millisecond),
green: util.Debounced(green, 20*time.Millisecond),
}
btns.red.BeginWatch(gpio.EdgeFalling, func() {
btns.Presses <- RedButton
})
btns.green.BeginWatch(gpio.EdgeFalling, func() {
btns.Presses <- GreenButton
})
return btns, nil
}
func main() {
flag.Parse()
log.Printf("Using pins %d as input and %d as output\n", *inN, *outN)
in, err := gpio.OpenPin(*inN, gpio.ModeInput)
if err != nil {
log.Panicf("Unable to open pin %d: %v", *inN, err)
}
out, err := gpio.OpenPin(*outN, gpio.ModeOutput)
if err != nil {
log.Panicf("Unable to open pin %d: %v", *outN, err)
}
log.Print("Pins opened...\n")
signals := make(chan os.Signal, 10)
signal.Notify(signals, os.Interrupt, os.Kill)
triggers := make(chan gpio.Edge, 120)
in.BeginWatch(gpio.EdgeRising, func() {
go func() { triggers <- gpio.EdgeFalling }()
})
var sum, max time.Duration
var count uint64
for {
count++
log.Print("Start!\n")
start := time.Now()
out.Set()
timeout := time.After(500 * time.Millisecond)
select {
case <-signals:
average := time.Duration(uint64(sum) / count)
log.Printf("Average delay: %v\n", average)
log.Printf("Max delay: %v\n", max)
return
case <-triggers:
took := time.Now().Sub(start)
out.Clear()
cleared := time.Now().Sub(start)
log.Printf("Signal took %v, cleared in %v\n", took, cleared)
sum += cleared
if cleared > max {
max = cleared
}
case t := <-timeout:
took := t.Sub(start)
log.Printf("Timed out after %v", took)
}
out.Clear()
time.Sleep(500 * time.Millisecond)
}
}
func main() {
flag.Parse()
fmt.Printf("Opening pin %d and ticking with %.3f Hz", *pin, *T)
pin, err := gpio.OpenPin(*pin, gpio.ModeOutput)
if err != nil {
fmt.Printf("Error opening pin %d: %s\n", pin, err)
return
}
// turn the led off on exit
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, os.Kill)
go func() {
for _ = range c {
fmt.Printf("\nClearing and unexporting the pin.\n")
pin.Clear()
pin.Close()
os.Exit(0)
}
}()
// Calculate half period
periodMs := (1 / *T) * 1000
tt := time.Duration(periodMs/2) * time.Millisecond
fmt.Println("")
for {
fmt.Print("\rsetting...")
pin.Set()
time.Sleep(tt)
pin.Clear()
fmt.Print("\rclearing...")
time.Sleep(tt)
}
}
// test opening pins from a non priviledged user fails
func TestOpenPinUnpriv(t *testing.T) {
checkNotRoot(t)
pin, err := gpio.OpenPin(rpi.GPIO_P1_22, gpio.ModeInput)
if err == nil {
pin.Close()
t.Fatalf("OpenPin is expected to fail for non priv user")
}
}
func TestOpenPin(t *testing.T) {
checkRoot(t)
pin, err := gpio.OpenPin(rpi.GPIO_P1_22, gpio.ModeInput)
if err != nil {
t.Fatal(err)
}
err = pin.Close()
if err != nil {
t.Fatal(err)
}
}
func main() {
flag.Parse()
var i, n int
var err error
var v string
pins := make([]int, 100) // should be good for anyone
for _, v = range strings.Split(*pinNumbers, ",") {
i, err = strconv.Atoi(v)
if err == nil {
pins[n] = i
n++
}
}
if n == 0 {
log.Fatalf("No pins specified, got %s", *pinNumbers)
} else {
log.Printf("Watching %d pins: %#v", n, pins[:n])
}
toggle := make(chan PinEvent, 10)
for _, i = range pins[:n] {
var pin gpio.Pin
var gpioNum = i
pin, err = gpio.OpenPin(gpioNum, gpio.ModeInput)
if err != nil {
log.Fatal(err)
}
defer pin.Close()
pin.BeginWatch(gpio.EdgeBoth, func() {
toggle <- PinEvent{gpioNum, pin.Get()}
})
}
// clean up on exit
die := make(chan os.Signal)
signal.Notify(die, os.Interrupt)
for {
select {
case <-die:
log.Println("Signal received, returning")
return
case e := <-toggle:
log.Printf("Pin %d is now %t", e.Number, e.Value)
}
}
}
func TestSetDirection(t *testing.T) {
checkRoot(t)
pin, err := gpio.OpenPin(rpi.GPIO_P1_22, gpio.ModeInput)
if err != nil {
t.Fatal(err)
}
defer pin.Close()
if dir, err := pin.Mode(), pin.Err(); dir != gpio.ModeInput || err != nil {
t.Fatalf("pin.Mode(): expected %v %v , got %v %v", gpio.ModeInput, nil, dir, err)
}
pin.SetMode(gpio.ModeOutput)
if pin.Err() != nil {
t.Fatal(err)
}
if dir, err := pin.Mode(), pin.Err(); dir != gpio.ModeOutput || err != nil {
t.Fatalf("pin.Mode(): expected %v %v , got %v %v", gpio.ModeOutput, nil, dir, err)
}
}
func main() {
flag.Parse()
fmt.Printf("Opening pin %d and ticking with %.3f Hz", *pin, *T)
pin, err := gpio.OpenPin(*pin, gpio.ModeOutput)
if err != nil {
fmt.Printf("Error opening pin %d: %s\n", pin, err)
return
}
// turn the led off on exit
signals := make(chan os.Signal, 1)
dying := make(chan int)
signal.Notify(signals, os.Interrupt, os.Kill)
go func() {
closed := false
for s := range signals {
fmt.Printf("\nGot %v, exiting...\n", s)
if !closed {
close(dying)
}
break
}
}()
// Calculate half period
periodMs := (1 / *T) * 1000
tt := time.Duration(periodMs/2) * time.Millisecond
// run without blocking
go loop(dying, tt, pin)
<-dying
// equivalently, just call loop in this goroutine
//loop(dying, tt, pin)
fmt.Print("Clearing and unexporting the pin.\n")
pin.Clear()
pin.Close()
}
func NewFromConfig(cfg config.DoorConfig) (d *Door, err error) {
// can you do it right in less lines?
// begin pin-opening boilerplate
openPins := make([]gpio.Pin, 6)
var i int
var savedError error
mustPin := func(n int, mode gpio.Mode) gpio.Pin {
if pin, err := gpio.OpenPin(n, mode); err != nil {
savedError = err
panic(err)
} else {
openPins[i] = pin
i++
return pin
}
}
defer func() {
if e := recover(); e != nil {
err = savedError
log.Printf("recovered %v", e)
for _, p := range openPins {
if p == nil {
return
}
p.Close()
}
}
}()
// end pin-opening boilerplate
d = &Door{
sensors: &sensors{
locked: mustPin(cfg.Pins.SenseLocked, gpio.ModeInput),
unlocked: mustPin(cfg.Pins.SenseUnlocked, gpio.ModeInput),
door: mustPin(cfg.Pins.SenseDoor, gpio.ModeInput),
},
controls: &controls{
enable: mustPin(cfg.Pins.LatchEnable, gpio.ModeLow),
lock: mustPin(cfg.Pins.LatchLock, gpio.ModeLow),
unlock: mustPin(cfg.Pins.LatchUnlock, gpio.ModeLow),
},
subsMutex: &sync.Mutex{},
}
d.dying = make(chan struct{})
d.state.State = &State{}
d.state.Mutex = &sync.Mutex{}
d.state.State.Door = NotChecked
d.state.State.Latch = Unknown
var found State
d.sensors.fetchDoorState(&found)
d.sensors.fetchLatchState(&found)
_, old := d.state.lockedSet(found)
d.notify(old, found)
go d.monitorPins()
return d, nil
}
// OpenPin returns a gpio.Pin implementation specalised for the RPi.
func OpenPin(number int, mode gpio.Mode) (gpio.Pin, error) {
initOnce.Do(initRPi)
p, err := gpio.OpenPin(number, mode)
return &pin{Pin: p, pin: uint8(number)}, err
}