Created separate component for backlight control

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

Signed-off-by: Rajssss <sssraj.sssraj@gmail.com>

CMakeLists.txt

@@ -2,7 +2,7 @@ if(ESP_PLATFORM)
 
 file(GLOB SOURCES *.c)
 set(LVGL_INCLUDE_DIRS . lvgl_tft)
-list(APPEND SOURCES "lvgl_tft/disp_driver.c")
+list(APPEND SOURCES "lvgl_tft/disp_driver.c" "lvgl_tft/esp_lcd_backlight.c")
 
 #@todo add SimleInclude macro here
 

lvgl_helpers.h

@@ -16,6 +16,7 @@ extern "C" {
 
 #include "lvgl_spi_conf.h"
 #include "lvgl_tft/disp_driver.h"
+#include "lvgl_tft/esp_lcd_backlight.h"
 #include "lvgl_touch/touch_driver.h"
 
 /*********************

lvgl_tft/esp_lcd_backlight.c

@@ -0,0 +1,58 @@
+/**
+ * @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) );
+}

lvgl_tft/esp_lcd_backlight.h

@@ -0,0 +1,36 @@
+/**
+ * @file esp_lcd_backlight.h
+ */
+
+#ifndef ESP_LCD_BACKLIGHT_H
+#define ESP_LCD_BACKLIGHT_H
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include <stdbool.h>
+#ifdef LV_LVGL_H_INCLUDE_SIMPLE
+#include "lvgl.h"
+#else
+#include "lvgl/lvgl.h"
+#endif
+
+
+/*********************
+ *      DEFINES
+ *********************/
+#define DISP_PIN_BCKL   CONFIG_LV_DISP_PIN_BCKL
+
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+void disp_brightness_control_enable(void);
+void disp_set_brightness(uint16_t brightness);
+
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*ESP_LCD_BACKLIGHT_H*/

lvgl_tft/st7735s.c

@@ -10,7 +10,6 @@
 #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"
@@ -173,51 +172,6 @@ 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
  **********************/

lvgl_tft/st7735s.h

@@ -26,7 +26,6 @@ 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
 
@@ -138,8 +137,6 @@ 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