mirror of https://github.com/kidoman/embd
69 lines
1.3 KiB
Go
69 lines
1.3 KiB
Go
package embd
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import (
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"fmt"
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"github.com/golang/glog"
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)
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type pin interface {
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Close() error
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}
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type gpioDriver struct {
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pinMap PinMap
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initializedPins map[string]pin
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}
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func newGPIODriver(pinMap PinMap) *gpioDriver {
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return &gpioDriver{
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pinMap: pinMap,
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initializedPins: map[string]pin{},
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}
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}
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func (io *gpioDriver) lookupKey(key interface{}, cap int) (*PinDesc, bool) {
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return io.pinMap.Lookup(key, cap)
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}
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func (io *gpioDriver) digitalPin(key interface{}) (*digitalPin, error) {
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pd, found := io.lookupKey(key, CapNormal)
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if !found {
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return nil, fmt.Errorf("gpio: could not find pin matching %q", key)
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}
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id := pd.ID
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p, ok := io.initializedPins[id]
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if ok {
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dp, ok := p.(*digitalPin)
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if !ok {
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return nil, fmt.Errorf("gpio: sorry, pin %q is already initialized for a different mode", key)
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}
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return dp, nil
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}
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if pd.Caps != CapNormal {
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glog.Infof("gpio: pin %q is not a dedicated digital io pin. please refer to the system reference manual for more details", key)
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}
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dp := newDigitalPin(pd.DigitalLogical)
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io.initializedPins[id] = dp
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return dp, nil
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}
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func (io *gpioDriver) DigitalPin(key interface{}) (DigitalPin, error) {
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return io.digitalPin(key)
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}
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func (io *gpioDriver) Close() error {
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for _, p := range io.initializedPins {
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if err := p.Close(); err != nil {
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return err
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}
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}
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return nil
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}
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