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35 lines
933 B
Go
35 lines
933 B
Go
// Copyright 2025 The Periph Authors. All rights reserved.
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// Use of this source code is governed under the Apache License, Version 2.0
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// that can be found in the LICENSE file.
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package hd44780
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import (
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"periph.io/x/conn/v3/display"
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"periph.io/x/conn/v3/gpio"
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)
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// A monochrome backlight Implements display.Backlight It uses a single
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// GPIO Pin to turn the backlight on or off.
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type GPIOMonoBacklight struct {
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blPin gpio.PinOut
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}
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// Given a GPIO pin that turns the backlight on/off, construct a monobacklight
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// to use with HD44780.
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func NewBacklight(blPin gpio.PinOut) *GPIOMonoBacklight {
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return &GPIOMonoBacklight{blPin: blPin}
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}
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// Turn the display backlight on or off.
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func (bl *GPIOMonoBacklight) Backlight(intensity display.Intensity) (err error) {
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if intensity == 0 {
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err = bl.blPin.Out(gpio.Low)
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} else {
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err = bl.blPin.Out(gpio.High)
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}
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return err
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}
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var _ display.DisplayBacklight = &GPIOMonoBacklight{}
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