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gpio: pwm support for bbb

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This commit is contained in:
Kunal Powar 2014-03-28 08:24:42 +05:30 • committed by kunalpowar
parent 8d9f991fb0
commit 14b078a43e
7 changed files with 329 additions and 28 deletions
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20
gpiodriver.go
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@ -16,15 +16,17 @@ type gpioDriver struct {
dpf func(n int) DigitalPin
apf func(n int) AnalogPin
ppf func(n string) PWMPin
initializedPins map[string]pin
}
func newGPIODriver(pinMap PinMap, dpf func(n int) DigitalPin, apf func(n int) AnalogPin) GPIODriver {
func newGPIODriver(pinMap PinMap, dpf func(n int) DigitalPin, apf func(n int) AnalogPin, ppf func(n string) PWMPin) GPIODriver {
return &gpioDriver{
pinMap: pinMap,
dpf: dpf,
apf: apf,
ppf: ppf,
initializedPins: map[string]pin{},
}
@ -62,6 +64,22 @@ func (io *gpioDriver) AnalogPin(key interface{}) (AnalogPin, error) {
return p, nil
}
func (io *gpioDriver) PWMPin(key interface{}) (PWMPin, error) {
if io.ppf == nil {
return nil, errors.New("gpio: pwm not supported on this host")
}
pd, found := io.pinMap.Lookup(key, CapPWM)
if !found {
return nil, fmt.Errorf("gpio: could not find pin matching %v", key)
}
p := io.ppf(pd.ID)
io.initializedPins[pd.ID] = p
return p, nil
}
func (io *gpioDriver) Close() error {
for _, p := range io.initializedPins {
if err := p.Close(); err != nil {