zenermerps/lvgl_esp32_drivers
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st7735s: Added brightness control though LED pin

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-> Uses LED(Backlight) Pin as PWM to control the brightness

Signed-off-by: Rajssss <sssraj.sssraj@gmail.com>
This commit is contained in:
Rajssss 2021-06-20 20:20:27 +05:30
parent cccb932d3c
commit a17a77b923
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GPG key ID: 5D2F803A3F7DD428
2 changed files with 49 additions and 0 deletions
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46
lvgl_tft/st7735s.c
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@ -10,6 +10,7 @@
#include "disp_spi.h"
#include "driver/i2c.h"
#include "driver/gpio.h"
#include "driver/ledc.h"
#include "esp_log.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
@ -172,6 +173,51 @@ void st7735s_sleep_out()
st7735s_send_cmd(0x11);
}
void st7735s_brightness_control_enable(void)
{
/*
Configure LED (Backlight) pin as PWM for Brightness control.
*/
ledc_channel_config_t LCD_backlight_channel = {
.gpio_num = ST7735S_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 st7735s_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) );
}
/**********************
* STATIC FUNCTIONS
**********************/

3
lvgl_tft/st7735s.h
View file

@ -26,6 +26,7 @@ extern "C" {
#define DISP_BUF_SIZE (LV_HOR_RES_MAX * 40)
#define ST7735S_DC CONFIG_LV_DISP_PIN_DC
#define ST7735S_BCKL CONFIG_LV_DISP_PIN_BCKL
#define ST7735S_RST CONFIG_LV_DISP_PIN_RST
#define ST7735S_USE_RST CONFIG_LV_DISP_USE_RST
@ -137,6 +138,8 @@ void st7735s_flush(lv_disp_drv_t * drv, const lv_area_t * area, lv_color_t * col
void st7735s_enable_backlight(bool backlight);
void st7735s_sleep_in(void);
void st7735s_sleep_out(void);
void st7735s_brightness_control_enable(void);
void st7735s_set_brightness(uint16_t brightness);
/**********************
* MACROS