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gpio: analog pin support for the bbb

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This commit is contained in:
Karan Misra 2014-03-23 04:59:35 +05:30
parent f667c93b7a
commit d64682bf34
8 changed files with 354 additions and 40 deletions
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66
gpiodriver.go
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@ -1,9 +1,8 @@
package embd
import (
"errors"
"fmt"
"github.com/golang/glog"
)
type pin interface {
@ -11,39 +10,54 @@ type pin interface {
}
type gpioDriver struct {
pinMap PinMap
pinMap PinMap
dpf func(n int) DigitalPin
apf func(n int) AnalogPin
initializedPins map[string]pin
}
func newGPIODriver(pinMap PinMap) *gpioDriver {
func newGPIODriver(pinMap PinMap, dpf func(n int) DigitalPin, apf func(n int) AnalogPin) GPIO {
return &gpioDriver{
pinMap: pinMap,
pinMap: pinMap,
dpf: dpf,
apf: apf,
initializedPins: map[string]pin{},
}
}
func (io *gpioDriver) lookupKey(key interface{}, cap int) (*PinDesc, bool) {
return io.pinMap.Lookup(key, cap)
}
func (io *gpioDriver) digitalPin(key interface{}) (*digitalPin, error) {
pd, found := io.lookupKey(key, CapNormal)
if !found {
return nil, fmt.Errorf("gpio: could not find pin matching %q", key)
}
if pd.Caps != CapNormal {
glog.Infof("gpio: pin %q is not a dedicated digital io pin. please refer to the system reference manual for more details", key)
}
dp := newDigitalPin(pd.DigitalLogical)
io.initializedPins[pd.ID] = dp
return dp, nil
}
func (io *gpioDriver) DigitalPin(key interface{}) (DigitalPin, error) {
return io.digitalPin(key)
if io.dpf == nil {
return nil, errors.New("gpio: digital io not supported on this host")
}
pd, found := io.pinMap.Lookup(key, CapNormal)
if !found {
return nil, fmt.Errorf("gpio: could not find pin matching %v", key)
}
p := io.dpf(pd.DigitalLogical)
io.initializedPins[pd.ID] = p
return p, nil
}
func (io *gpioDriver) AnalogPin(key interface{}) (AnalogPin, error) {
if io.apf == nil {
return nil, errors.New("gpio: analog io not supported on this host")
}
pd, found := io.pinMap.Lookup(key, CapAnalog)
if !found {
return nil, fmt.Errorf("gpio: could not find pin matching %v", key)
}
p := io.apf(pd.AnalogLogical)
io.initializedPins[pd.ID] = p
return p, nil
}
func (io *gpioDriver) Close() error {