t/esp32_sd_lcd_image_viewer
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

bezier and power level based stepping of backlight was not possible, used esp lcdc to fade the backlight off and on

Browse Source
This commit is contained in:
Timo Niemann
2026-07-02 12:00:32 +02:00
parent 28e6d42f05
commit 3c086037f6
5 changed files with 61 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files
main/CMakeLists.txt
+1 -1
View File
@@ -1,3 +1,3 @@
idf_component_register(SRCS main.c lcd/lcd.c sd/sd.c lcd/ui.c lcd/ui_log.c lcd/ui_image_browser.c
PRIV_REQUIRES spi_flash esp_psram esp_lcd esp_driver_gpio esp_driver_i2c esp_driver_sdspi esp_driver_spi esp_lvgl_port esp_lcd_touch_gt911 fatfs sdmmc
PRIV_REQUIRES spi_flash esp_psram esp_lcd esp_driver_gpio esp_driver_i2c esp_driver_ledc esp_driver_sdspi esp_driver_spi esp_lvgl_port esp_lcd_touch_gt911 fatfs sdmmc
INCLUDE_DIRS "." "include")
main/include/lcd/lcd.h
+1
View File
@@ -12,6 +12,7 @@ extern "C" {
esp_err_t lcd_init(void);
lv_display_t *lcd_get_display(void);
void lcd_backlight_set(uint8_t level);
#ifdef __cplusplus
}
main/lcd/lcd.c
+38 -7
View File
@@ -2,6 +2,7 @@
#include "driver/gpio.h"
#include "driver/i2c_master.h"
#include "driver/ledc.h"
#include "esp_check.h"
#include "esp_idf_version.h"
#include "esp_lcd_panel_io.h"
@@ -27,6 +28,13 @@
#define LCD_GPIO_DISP (GPIO_NUM_NC)
#define LCD_GPIO_BACKLIGHT (GPIO_NUM_2)
#define LCD_BACKLIGHT_ON_LEVEL (1)
#define LCD_BACKLIGHT_LEDC_MODE (LEDC_LOW_SPEED_MODE)
#define LCD_BACKLIGHT_LEDC_TIMER (LEDC_TIMER_0)
#define LCD_BACKLIGHT_LEDC_CHANNEL (LEDC_CHANNEL_0)
#define LCD_BACKLIGHT_LEDC_RESOLUTION (LEDC_TIMER_8_BIT)
#define LCD_BACKLIGHT_LEDC_DUTY_MAX ((1 << 8) - 1)
#define LCD_BACKLIGHT_LEDC_FREQ_HZ (5000)
#define LCD_BACKLIGHT_FADE_MS (150)
#define LCD_GPIO_DATA0 (GPIO_NUM_8)
#define LCD_GPIO_DATA1 (GPIO_NUM_3)
#define LCD_GPIO_DATA2 (GPIO_NUM_46)
@@ -72,14 +80,28 @@ static lv_display_t *lvgl_display;
static lv_indev_t *lvgl_touch_indev;
static esp_err_t init_backlight(void){
const gpio_config_t backlight_config = {
.mode = GPIO_MODE_OUTPUT,
.pin_bit_mask = 1ULL << LCD_GPIO_BACKLIGHT,
const ledc_timer_config_t timer_config = {
.speed_mode = LCD_BACKLIGHT_LEDC_MODE,
.timer_num = LCD_BACKLIGHT_LEDC_TIMER,
.duty_resolution = LCD_BACKLIGHT_LEDC_RESOLUTION,
.freq_hz = LCD_BACKLIGHT_LEDC_FREQ_HZ,
.clk_cfg = LEDC_AUTO_CLK,
};
ESP_RETURN_ON_ERROR(gpio_config(&backlight_config), TAG, "Backlight GPIO config failed");
ESP_RETURN_ON_ERROR(gpio_set_level(LCD_GPIO_BACKLIGHT, LCD_BACKLIGHT_ON_LEVEL), TAG, "Backlight GPIO set failed");
ESP_LOGI(TAG, "Backlight enabled on GPIO%d", LCD_GPIO_BACKLIGHT);
return ESP_OK;
ESP_RETURN_ON_ERROR(ledc_timer_config(&timer_config), TAG, "Backlight LEDC timer config failed");
const ledc_channel_config_t channel_config = {
.gpio_num = LCD_GPIO_BACKLIGHT,
.speed_mode = LCD_BACKLIGHT_LEDC_MODE,
.channel = LCD_BACKLIGHT_LEDC_CHANNEL,
.timer_sel = LCD_BACKLIGHT_LEDC_TIMER,
.intr_type = LEDC_INTR_DISABLE,
.duty = (LCD_BACKLIGHT_ON_LEVEL != 0) ? LCD_BACKLIGHT_LEDC_DUTY_MAX : 0,
.hpoint = 0,
};
ESP_RETURN_ON_ERROR(ledc_channel_config(&channel_config), TAG, "Backlight LEDC channel config failed");
ESP_RETURN_ON_ERROR(ledc_fade_func_install(0), TAG, "Backlight LEDC fade install failed");
ESP_LOGI(TAG, "Backlight PWM enabled on GPIO%d", LCD_GPIO_BACKLIGHT);
return ESP_OK;
}
static esp_err_t probe_gt911_address(i2c_master_bus_handle_t i2c_handle, uint32_t *dev_addr){
@@ -272,6 +294,15 @@ static esp_err_t init_lvgl(void){
return ESP_OK;
}
void lcd_backlight_set(uint8_t level){
const uint32_t duty = (LCD_BACKLIGHT_ON_LEVEL != 0) ? level : (LCD_BACKLIGHT_LEDC_DUTY_MAX - level);
esp_err_t err = ledc_set_fade_with_time(LCD_BACKLIGHT_LEDC_MODE, LCD_BACKLIGHT_LEDC_CHANNEL, duty, LCD_BACKLIGHT_FADE_MS);
if(err == ESP_OK){
err = ledc_fade_start(LCD_BACKLIGHT_LEDC_MODE, LCD_BACKLIGHT_LEDC_CHANNEL, LEDC_FADE_WAIT_DONE);
}
if(err != ESP_OK) ESP_LOGW(TAG, "Backlight set failed: %s", esp_err_to_name(err));
}
esp_err_t lcd_init(void){
ESP_RETURN_ON_ERROR(init_rgb_panel(), TAG, "LCD panel init failed");
const esp_err_t touch_ret = init_touch();
main/lcd/ui_image_browser.c
+14 -1
View File
@@ -15,6 +15,7 @@
#include "lcd/ui_internal.h"
#include "lcd/ui_log.h"
#include "sd/sd.h"
#include "lcd/lcd.h"
#define UI_IMAGE_PATH_PREFIX "A:/sdcard/"
#define UI_IMAGE_PATH_MAX_LENGTH 160
@@ -349,6 +350,7 @@ static bool ui_image_browser_display_prefetched(void){
/* Warm up the next image so the following switch is instant too. */
ui_prefetch_next(index, slot);
return true;
}
@@ -395,11 +397,22 @@ static void ui_image_browser_load_via_path(void){
static void ui_image_browser_display_current(void){
if(image_widget == NULL || image_browser_names == NULL || image_browser_image_count == 0) return;
if(ui_image_browser_display_prefetched()) return;
ESP_LOGI(TAG, "Backlight sweep: turning off backlight");
ui_log_append("Backlight sweep: turning off backlight");
lcd_backlight_set(0);
if(ui_image_browser_display_prefetched()) goto done;
ESP_LOGW(TAG, "Prefetched image unavailable: falling back to on-demand decoding");
ui_log_append("Prefetched image unavailable: falling back to on-demand decoding");
/* Prefetch unavailable or render failed: fall back to on-demand decoding. */
visible_slot = -1;
ui_image_browser_load_via_path();
done:
ESP_LOGI(TAG, "Backlight sweep: turning on backlight");
ui_log_append("Backlight sweep: turning on backlight");
lcd_backlight_set(255);
}
void ui_image_browser_build_view(lv_obj_t *screen){