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gpio: provide an api to allow performance timing of pulses

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the us020 driver is the first consumer of this functionality
This commit is contained in:
Karan Misra 2014-04-05 04:06:40 +05:30
parent af23a999ba
commit 5b852d9f42
3 changed files with 87 additions and 43 deletions
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31
sensor/us020/us020.go
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@ -91,36 +91,11 @@ func (d *US020) Distance() (float64, error) {
glog.V(2).Infof("us020: waiting for echo to go high")
// Wait until ECHO goes high
for {
v, err := d.EchoPin.Read()
if err != nil {
return 0, err
}
if v == embd.High {
break
}
duration, err := d.EchoPin.TimePulse(embd.High)
if err != nil {
return 0, err
}
startTime := time.Now() // Record time when ECHO goes high
glog.V(2).Infof("us020: waiting for echo to go low")
// Wait until ECHO goes low
for {
v, err := d.EchoPin.Read()
if err != nil {
return 0, err
}
if v == embd.Low {
break
}
}
duration := time.Since(startTime) // Calculate time lapsed for ECHO to transition from high to low
// Calculate the distance based on the time computed
distance := float64(duration.Nanoseconds()) / 10000000 * (d.speedSound / 2)