mirror of https://github.com/kidoman/embd
114 lines
2.7 KiB
Go
114 lines
2.7 KiB
Go
/*
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* Copyright (c) Karan Misra 2014
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
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* associated documentation files (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge, publish, distribute,
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* sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or
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* substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
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* NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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// LED support.
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package embd
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// The LED interface is used to control a led on the prototyping board.
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type LED interface {
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// On switches the LED on.
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On() error
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// Off switches the LED off.
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Off() error
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// Toggle toggles the LED.
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Toggle() error
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// Close releases resources associated with the LED.
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Close() error
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}
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// LEDDriver interface interacts with the host descriptors to allow us
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// control of the LEDs.
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type LEDDriver interface {
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LED(key interface{}) (LED, error)
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Close() error
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}
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var ledDriverInitialized bool
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var ledDriverInstance LEDDriver
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// InitLED initializes the LED driver.
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func InitLED() error {
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if ledDriverInitialized {
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return nil
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}
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desc, err := DescribeHost()
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if err != nil {
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return err
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}
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if desc.LEDDriver == nil {
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return ErrFeatureNotSupported
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}
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ledDriverInstance = desc.LEDDriver()
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ledDriverInitialized = true
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return nil
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}
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// CloseLED releases resources associated with the LED driver.
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func CloseLED() error {
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return ledDriverInstance.Close()
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}
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// NewLED returns a LED interface which allows control over the LED.
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func NewLED(key interface{}) (LED, error) {
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if err := InitLED(); err != nil {
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return nil, err
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}
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return ledDriverInstance.LED(key)
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}
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// LEDOn switches the LED on.
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func LEDOn(key interface{}) error {
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led, err := NewLED(key)
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if err != nil {
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return err
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}
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return led.On()
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}
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// LEDOff switches the LED off.
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func LEDOff(key interface{}) error {
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led, err := NewLED(key)
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if err != nil {
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return err
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}
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return led.Off()
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}
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// LEDToggle toggles the LED.
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func LEDToggle(key interface{}) error {
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led, err := NewLED(key)
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if err != nil {
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return err
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}
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return led.Toggle()
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}
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