54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
#include "pages_pwm.h"
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#include "dzbj_gpio.h"
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#include "driver/ledc.h"
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// 当前亮度值（用于休眠恢复）
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static uint8_t current_brightness = 50;
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// 获取当前亮度值
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uint8_t pwm_get_brightness(void) {
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return current_brightness;
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}
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// 设置屏幕亮度，percent范围0-100
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// 0=完全关闭背光，10~100为正常亮度范围
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// 显示10%~100%映射到实际亮度20%~100%，背光低电平有效需反转占空比
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void pwm_set_brightness(uint8_t percent) {
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if (percent == 0) {
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// 完全关闭背光（低电平有效，占空比100%=全高=关闭）
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ledc_set_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0, 8191);
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ledc_update_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0);
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return;
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}
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if (percent < 10) percent = 10;
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if (percent > 100) percent = 100;
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current_brightness = percent;
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uint32_t actual = 20 + (uint32_t)(percent - 10) * 80 / 90;
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uint32_t duty = 8191 - (8191 * actual) / 100;
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ledc_set_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0, duty);
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ledc_update_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0);
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}
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// 初始化PWM背光
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void pwm_init(void) {
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ledc_timer_config_t ledc_timer = {
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.speed_mode = LEDC_LOW_SPEED_MODE,
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.timer_num = LEDC_TIMER_0,
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.duty_resolution = LEDC_TIMER_13_BIT,
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.freq_hz = 5000,
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.clk_cfg = LEDC_AUTO_CLK
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};
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ledc_timer_config(&ledc_timer);
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ledc_channel_config_t ledc_channel = {
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.speed_mode = LEDC_LOW_SPEED_MODE,
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.channel = LEDC_CHANNEL_0,
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.timer_sel = LEDC_TIMER_0,
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.intr_type = LEDC_INTR_DISABLE,
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.gpio_num = PIN_LCD_EN,
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.duty = 0,
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.hpoint = 0
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};
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ledc_channel_config(&ledc_channel);
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pwm_set_brightness(50); // 初始亮度50%
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}
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