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Created separate component for backlight control

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-> Uses Timer 0, Channel 0 as PWM to control
   backlight via LED pin

Signed-off-by: Rajssss <sssraj.sssraj@gmail.com>
This commit is contained in:
Rajssss 2021-06-26 12:10:41 +05:30
parent a17a77b923
commit 5d4334a5b9
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GPG key ID: 5D2F803A3F7DD428
6 changed files with 96 additions and 50 deletions
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58
lvgl_tft/esp_lcd_backlight.c Normal file
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/**
* @file esp_lcd_backlight.c
*
*/
/*********************
* INCLUDES
*********************/
#include "esp_lcd_backlight.h"
#include "driver/ledc.h"
#include "esp_log.h"
static const char *TAG = "disp_brightness";
void disp_brightness_control_enable(void)
{
/*
Configure LED (Backlight) pin as PWM for Brightness control.
*/
ledc_channel_config_t LCD_backlight_channel = {
.gpio_num = DISP_PIN_BCKL,
.speed_mode = LEDC_LOW_SPEED_MODE,
.channel = LEDC_CHANNEL_0,
.intr_type = LEDC_INTR_DISABLE,
.timer_sel = LEDC_TIMER_0,
.duty = 0,
.hpoint = 0,
.flags.output_invert = 0
};
ledc_timer_config_t LCD_backlight_timer = {
.speed_mode = LEDC_LOW_SPEED_MODE,
.bit_num = LEDC_TIMER_10_BIT,
.timer_num = LEDC_TIMER_0,
.freq_hz = 5000,
.clk_cfg = LEDC_AUTO_CLK
};
ESP_ERROR_CHECK( ledc_timer_config(&LCD_backlight_timer) );
ESP_ERROR_CHECK( ledc_channel_config(&LCD_backlight_channel) );
}
void disp_set_brightness(uint16_t brightness)
{
/*
Set brightness.
0 -> Display off
100 -> Full brightness
NOTE: brightness value must be between 0 - 100
*/
if(brightness > 100)
{
ESP_LOGE(TAG, "Brightness value must be between 0 - 100");
return;
}
ESP_ERROR_CHECK( ledc_set_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0, brightness*10) );
ESP_ERROR_CHECK( ledc_update_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0) );
}