#include "backlight.h"
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#include "settings.h"
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#include <esp_log.h>
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#include <driver/ledc.h>
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#define TAG "Backlight"
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Backlight::Backlight() {
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// 创建背光渐变定时器
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const esp_timer_create_args_t timer_args = {
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.callback = [](void* arg) {
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auto self = static_cast<Backlight*>(arg);
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self->OnTransitionTimer();
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},
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.arg = this,
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.dispatch_method = ESP_TIMER_TASK,
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.name = "backlight_timer",
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.skip_unhandled_events = true,
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};
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ESP_ERROR_CHECK(esp_timer_create(&timer_args, &transition_timer_));
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}
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Backlight::~Backlight() {
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if (transition_timer_ != nullptr) {
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esp_timer_stop(transition_timer_);
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esp_timer_delete(transition_timer_);
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}
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}
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void Backlight::RestoreBrightness() {
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// Load brightness from settings
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Settings settings("display");
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int saved_brightness = settings.GetInt("brightness", 75);
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// 检查亮度值是否为0或过小，设置默认值
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if (saved_brightness <= 0) {
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ESP_LOGW(TAG, "Brightness value (%d) is too small, setting to default (10)", saved_brightness);
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saved_brightness = 10; // 设置一个较低的默认值
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}
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SetBrightness(saved_brightness);
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}
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void Backlight::SetBrightness(uint8_t brightness, bool permanent) {
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if (brightness > 100) {
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brightness = 100;
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}
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if (brightness_ == brightness) {
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return;
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}
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if (permanent) {
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Settings settings("display", true);
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settings.SetInt("brightness", brightness);
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}
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target_brightness_ = brightness;
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step_ = (target_brightness_ > brightness_) ? 1 : -1;
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if (transition_timer_ != nullptr) {
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// 启动定时器，每 5ms 更新一次
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esp_timer_start_periodic(transition_timer_, 5 * 1000);
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}
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ESP_LOGI(TAG, "Set brightness to %d", brightness);
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}
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void Backlight::OnTransitionTimer() {
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if (brightness_ == target_brightness_) {
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esp_timer_stop(transition_timer_);
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return;
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}
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brightness_ += step_;
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SetBrightnessImpl(brightness_);
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if (brightness_ == target_brightness_) {
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esp_timer_stop(transition_timer_);
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}
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}
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PwmBacklight::PwmBacklight(gpio_num_t pin, bool output_invert, uint32_t freq_hz) : Backlight() {
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const ledc_timer_config_t backlight_timer = {
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.speed_mode = LEDC_LOW_SPEED_MODE,
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.duty_resolution = LEDC_TIMER_10_BIT,
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.timer_num = LEDC_TIMER_0,
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.freq_hz = freq_hz, //背光pwm频率需要高一点，防止电感啸叫
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.clk_cfg = LEDC_AUTO_CLK,
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.deconfigure = false
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};
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ESP_ERROR_CHECK(ledc_timer_config(&backlight_timer));
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// Setup LEDC peripheral for PWM backlight control
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const ledc_channel_config_t backlight_channel = {
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.gpio_num = pin,
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.speed_mode = LEDC_LOW_SPEED_MODE,
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.channel = LEDC_CHANNEL_0,
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.intr_type = LEDC_INTR_DISABLE,
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.timer_sel = LEDC_TIMER_0,
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.duty = 0,
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.hpoint = 0,
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.flags = {
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.output_invert = output_invert,
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}
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};
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ESP_ERROR_CHECK(ledc_channel_config(&backlight_channel));
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}
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PwmBacklight::~PwmBacklight() {
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ledc_stop(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0, 0);
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}
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void PwmBacklight::SetBrightnessImpl(uint8_t brightness) {
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// LEDC resolution set to 10bits, thus: 100% = 1023
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uint32_t duty_cycle = (1023 * brightness) / 100;
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ledc_set_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0, duty_cycle);
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ledc_update_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0);
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}
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