go-embedded/embd
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embd
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Added timeout to TimePulse

This commit is contained in:
Neagu Bogdan 2016-05-21 20:01:27 +03:00
parent bfcd1345fe
commit 97b1dae347
1 changed files with 16 additions and 0 deletions
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16
host/generic/digitalpin.go
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@ -15,6 +15,8 @@ import (
"github.com/kidoman/embd" "github.com/kidoman/embd"
) )
const timeoutInterval = 10000000
type digitalPin struct { type digitalPin struct {
id string id string
n int n int
@ -165,6 +167,8 @@ func (p *digitalPin) TimePulse(state int) (time.Duration, error) {
aroundState = embd.High aroundState = embd.High
} }
initTime := time.Now()
// Wait for any previous pulse to end // Wait for any previous pulse to end
for { for {
v, err := p.read() v, err := p.read()
@ -175,6 +179,10 @@ func (p *digitalPin) TimePulse(state int) (time.Duration, error) {
if v == aroundState { if v == aroundState {
break break
} }
if time.Since(initTime).Nanoseconds() > timeoutInterval {
return 0, nil
}
} }
// Wait until ECHO goes high // Wait until ECHO goes high
@ -187,6 +195,10 @@ func (p *digitalPin) TimePulse(state int) (time.Duration, error) {
if v == state { if v == state {
break break
} }
if time.Since(initTime).Nanoseconds() > timeoutInterval {
return 0, nil
}
} }
startTime := time.Now() // Record time when ECHO goes high startTime := time.Now() // Record time when ECHO goes high
@ -201,6 +213,10 @@ func (p *digitalPin) TimePulse(state int) (time.Duration, error) {
if v == aroundState { if v == aroundState {
break break
} }
if time.Since(initTime).Nanoseconds() > timeoutInterval {
return 0, nil
}
} }
return time.Since(startTime), nil // Calculate time lapsed for ECHO to transition from high to low return time.Since(startTime), nil // Calculate time lapsed for ECHO to transition from high to low