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43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <stdbool.h>
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#include <stdint.h>
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typedef enum {
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LEDEnablerNone = (1 << 0),
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LEDEnablerBacklight = (1 << 1),
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LEDEnablerHRM = (1 << 2),
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} LEDEnabler;
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// The light brightness can vary between LIGHT_BRIGHTNESS_OFF and LIGHT_BRIGHTNESS_ON
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#define BACKLIGHT_BRIGHTNESS_OFF 0x0000
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#define BACKLIGHT_BRIGHTNESS_MAX 0x4000
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void backlight_init(void);
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//! @param brightness a number between BACKLIGHT_BRIGHTNESS_OFF and BACKLIGHT_BRIGHTNESS_ON
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void backlight_set_brightness(uint16_t brightness);
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//! On some boards, the LED enable gpio is actually a toggle for 4.5v.
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//! Other portions of the system may require this to be enabled in order to function.
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//! Keep track of who is using the LED enable so that way we don't turn it off on them.
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//! Those components which may need to toggle LED Enable are listed in \ref LEDEnabler.
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void led_enable(LEDEnabler enabler);
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void led_disable(LEDEnabler enabler);
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