5d4334a5b9
-> Uses Timer 0, Channel 0 as PWM to control backlight via LED pin Signed-off-by: Rajssss <sssraj.sssraj@gmail.com>
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
/**
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* @file esp_lcd_backlight.c
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*
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*/
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/*********************
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* INCLUDES
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*********************/
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#include "esp_lcd_backlight.h"
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#include "driver/ledc.h"
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#include "esp_log.h"
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static const char *TAG = "disp_brightness";
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void disp_brightness_control_enable(void)
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{
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/*
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Configure LED (Backlight) pin as PWM for Brightness control.
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*/
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ledc_channel_config_t LCD_backlight_channel = {
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.gpio_num = DISP_PIN_BCKL,
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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.output_invert = 0
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};
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ledc_timer_config_t LCD_backlight_timer = {
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.speed_mode = LEDC_LOW_SPEED_MODE,
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.bit_num = LEDC_TIMER_10_BIT,
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.timer_num = LEDC_TIMER_0,
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.freq_hz = 5000,
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.clk_cfg = LEDC_AUTO_CLK
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};
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ESP_ERROR_CHECK( ledc_timer_config(&LCD_backlight_timer) );
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ESP_ERROR_CHECK( ledc_channel_config(&LCD_backlight_channel) );
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}
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void disp_set_brightness(uint16_t brightness)
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{
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/*
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Set brightness.
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0 -> Display off
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100 -> Full brightness
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NOTE: brightness value must be between 0 - 100
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*/
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if(brightness > 100)
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{
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ESP_LOGE(TAG, "Brightness value must be between 0 - 100");
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return;
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}
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ESP_ERROR_CHECK( ledc_set_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0, brightness*10) );
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ESP_ERROR_CHECK( ledc_update_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0) );
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}
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