// Start starts the data acquisition loop.
func (d *TMP006) Start() error {
if err := d.setup(); err != nil {
return err
}
d.rawDieTemps = make(chan float64)
d.objTemps = make(chan float64)
go func() {
var rawDieTemp, objTemp float64
var rdtAvlb, otAvlb bool
var err error
var timer <-chan time.Time
resetTimer := func() {
timer = time.After(time.Duration(d.SampleRate.timeRequired*1000) * time.Millisecond)
}
resetTimer()
for {
var rawDieTemps, objTemps chan float64
if rdtAvlb {
rawDieTemps = d.rawDieTemps
}
if otAvlb {
objTemps = d.objTemps
}
select {
case <-timer:
var rdt float64
if rdt, err = d.measureRawDieTemp(); err != nil {
glog.Errorf("tmp006: %v", err)
} else {
rawDieTemp = rdt
rdtAvlb = true
}
var ot float64
if ot, err = d.measureObjTemp(); err != nil {
glog.Errorf("tmp006: %v", err)
} else {
objTemp = ot
otAvlb = true
}
resetTimer()
case rawDieTemps <- rawDieTemp:
rdtAvlb = false
case objTemps <- objTemp:
otAvlb = false
case waitc := <-d.closing:
waitc <- struct{}{}
close(d.rawDieTemps)
close(d.objTemps)
return
}
}
}()
return nil
}
// NewGPIO creates a new HD44780 connected by a 4-bit GPIO bus.
func NewGPIO(
rs, en, d4, d5, d6, d7, backlight interface{},
blPolarity BacklightPolarity,
rowAddr RowAddress,
modes ...ModeSetter,
) (*HD44780, error) {
pinKeys := []interface{}{rs, en, d4, d5, d6, d7, backlight}
pins := [7]embd.DigitalPin{}
for idx, key := range pinKeys {
if key == nil {
continue
}
var digitalPin embd.DigitalPin
if pin, ok := key.(embd.DigitalPin); ok {
digitalPin = pin
} else {
var err error
digitalPin, err = embd.NewDigitalPin(key)
if err != nil {
glog.V(1).Infof("hd44780: error creating digital pin %+v: %s", key, err)
return nil, err
}
}
pins[idx] = digitalPin
}
for _, pin := range pins {
if pin == nil {
continue
}
err := pin.SetDirection(embd.Out)
if err != nil {
glog.Errorf("hd44780: error setting pin %+v to out direction: %s", pin, err)
return nil, err
}
}
return New(
NewGPIOConnection(
pins[0],
pins[1],
pins[2],
pins[3],
pins[4],
pins[5],
pins[6],
blPolarity),
rowAddr,
modes...,
)
}
// Close closes all open DigitalPins.
func (conn *GPIOConnection) Close() error {
glog.V(2).Info("hd44780: closing all GPIO pins")
pins := []embd.DigitalPin{
conn.RS,
conn.EN,
conn.D4,
conn.D5,
conn.D6,
conn.D7,
conn.Backlight,
}
for _, pin := range pins {
err := pin.Close()
if err != nil {
glog.Errorf("hd44780: error closing pin %+v: %s", pin, err)
return err
}
}
return nil
}
// Start starts the data acquisition loop.
func (d *L3GD20) Start() error {
if err := d.setup(); err != nil {
return err
}
d.closing = make(chan chan struct{})
go func() {
var x, y, z float64
var orientations chan Orientation
timer := time.Tick(time.Duration(math.Floor(pollDelay)) * time.Microsecond)
for {
select {
case <-timer:
dx, dy, dz, err := d.measureOrientationDelta()
if err != nil {
glog.Errorf("l3gd20: %v", err)
} else {
x += dx * mult
y += dy * mult
z += dz * mult
orientations = d.orientations
}
case orientations <- Orientation{x, y, z}:
orientations = nil
case waitc := <-d.closing:
waitc <- struct{}{}
close(d.orientations)
return
}
}
}()
return nil
}