Merge pull request #74 from Rajssss/master

st7735s: Added brightness control though LED pin

Author: C47D

CMakeLists.txt

@@ -79,6 +79,11 @@ if(CONFIG_LV_TOUCH_CONTROLLER)
     endif()
 endif()
 
+# Add backlight control to compilation only if it is selected in menuconfig
+if(CONFIG_LV_ENABLE_BACKLIGHT_CONTROL)
+    list(APPEND SOURCES "lvgl_tft/esp_lcd_backlight.c")
+endif()
+
 if(CONFIG_LV_I2C)
     list(APPEND SOURCES "lvgl_i2c/i2c_manager.c")
 endif()

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 +1,37 @@
+/**
+ * @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
+ *********************/
+#if CONFIG_LV_ENABLE_BACKLIGHT_CONTROL
+#define DISP_PIN_BCKL   CONFIG_LV_DISP_PIN_BCKL
+#endif
+
+/**********************
+ * 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*/