Carve out backlight control to separate component
This commit is contained in:
parent
678779c848
commit
fa042b0ecd
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@ -3,8 +3,7 @@ if(ESP_PLATFORM)
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file(GLOB SOURCES *.c)
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set(LVGL_INCLUDE_DIRS . lvgl_tft)
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list(APPEND SOURCES "lvgl_tft/disp_driver.c")
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#@todo add SimleInclude macro here
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list(APPEND SOURCES "lvgl_tft/esp_lcd_backlight.c")
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# Include only the source file of the selected
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# display controller.
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@ -79,11 +78,6 @@ if(CONFIG_LV_TOUCH_CONTROLLER)
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endif()
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endif()
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# Add backlight control to compilation only if it is selected in menuconfig
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if(CONFIG_LV_ENABLE_BACKLIGHT_CONTROL)
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list(APPEND SOURCES "lvgl_tft/esp_lcd_backlight.c")
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endif()
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if(CONFIG_LV_I2C)
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list(APPEND SOURCES "lvgl_i2c/i2c_manager.c")
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endif()
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112
lvgl_tft/Kconfig
112
lvgl_tft/Kconfig
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@ -910,51 +910,6 @@ menu "LVGL TFT Display controller"
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help
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Configure the display Busy pin here.
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config LV_ENABLE_BACKLIGHT_CONTROL
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bool "Enable control of the display backlight by using an GPIO." if \
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( LV_PREDEFINED_DISPLAY_NONE && ! ( LV_TFT_DISPLAY_CONTROLLER_SH1107 || LV_TFT_DISPLAY_CONTROLLER_SSD1306 ) ) \
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|| LV_PREDEFINED_DISPLAY_RPI_MPI3501
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default y if LV_PREDEFINED_DISPLAY_M5STACK
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default n if LV_PREDEFINED_DISPLAY_M5CORE2
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default y if LV_PREDEFINED_DISPLAY_WROVER4
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default y if LV_PREDEFINED_DISPLAY_ERTFT0356
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default y if LV_PREDEFINED_DISPLAY_TTGO
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default y if LV_PREDEFINED_DISPLAY_TTGO_CAMERA_PLUS
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default y if LV_PREDEFINED_DISPLAY_WT32_SC01
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help
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Enable controlling the display backlight using an GPIO
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config LV_BACKLIGHT_ACTIVE_LVL
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bool "Is backlight turn on with a HIGH (1) logic level?"
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depends on LV_ENABLE_BACKLIGHT_CONTROL
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default y if LV_PREDEFINED_DISPLAY_M5STACK
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default y if LV_PREDEFINED_DISPLAY_ERTFT0356
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default y if LV_PREDEFINED_DISPLAY_TTGO
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default y if LV_PREDEFINED_DISPLAY_TTGO_CAMERA_PLUS
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default y if LV_PREDEFINED_DISPLAY_WT32_SC01
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help
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Some backlights are turned on with a high signal, others held low.
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If enabled, a value of 1 will be sent to the display to enable the backlight,
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otherwise a 0 will be expected to enable it.
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config LV_DISP_PIN_BCKL
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int "GPIO for Backlight Control"
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depends on LV_ENABLE_BACKLIGHT_CONTROL
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default 23 if LV_PREDEFINED_PINS_38V1
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default 26 if LV_PREDEFINED_PINS_38V4
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default 32 if LV_PREDEFINED_DISPLAY_M5STACK
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default 5 if LV_PREDEFINED_DISPLAY_WROVER4
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default 2 if LV_PREDEFINED_DISPLAY_ADA_FEATHERWING
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default 27 if LV_PREDEFINED_DISPLAY_ERTFT0356
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default 0 if LV_PREDEFINED_PINS_TKOALA
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default 4 if LV_PREDEFINED_DISPLAY_TTGO
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default 2 if LV_PREDEFINED_DISPLAY_TTGO_CAMERA_PLUS
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default 23 if LV_PREDEFINED_DISPLAY_WT32_SC01
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default 27
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help
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Configure the display BCLK (LED) pin here.
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endmenu
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choice
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@ -978,6 +933,73 @@ menu "LVGL TFT Display controller"
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endchoice
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choice
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prompt "Backlight Control" if \
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(! ( LV_TFT_DISPLAY_CONTROLLER_SH1107 || LV_TFT_DISPLAY_CONTROLLER_SSD1306 ) )
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default LV_DISP_BACKLIGHT_SWITCH if LV_PREDEFINED_DISPLAY_M5STACK
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default LV_DISP_BACKLIGHT_OFF if LV_PREDEFINED_DISPLAY_M5CORE2
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default LV_DISP_BACKLIGHT_SWITCH if LV_PREDEFINED_DISPLAY_WROVER4
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default LV_DISP_BACKLIGHT_SWITCH if LV_PREDEFINED_DISPLAY_ERTFT0356
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default LV_DISP_BACKLIGHT_SWITCH if LV_PREDEFINED_DISPLAY_TTGO
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default LV_DISP_BACKLIGHT_SWITCH if LV_PREDEFINED_DISPLAY_TTGO_CAMERA_PLUS
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default LV_DISP_BACKLIGHT_SWITCH if LV_PREDEFINED_DISPLAY_WT32_SC01
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default LV_DISP_BACKLIGHT_OFF
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config LV_DISP_BACKLIGHT_OFF
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bool
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prompt "Not Used"
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help
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Display backlight is not controlled by this driver, must be hardwired in hardware.
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config LV_DISP_BACKLIGHT_SWITCH
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bool
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prompt "Switch control"
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help
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Display backlight can be switched on or off.
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config LV_DISP_BACKLIGHT_PWM
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bool
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prompt "PWM control"
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help
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Display backlight is controlled by pulse-width modulation, allowing brightness settings.
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endchoice
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config LV_BACKLIGHT_ACTIVE_LVL
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bool "Is backlight turn on with a HIGH (1) logic level?" if \
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( LV_PREDEFINED_DISPLAY_NONE && ! ( LV_TFT_DISPLAY_CONTROLLER_SH1107 || LV_TFT_DISPLAY_CONTROLLER_SSD1306 ) ) \
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|| LV_PREDEFINED_DISPLAY_RPI_MPI3501
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depends on !LV_DISP_BACKLIGHT_OFF
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default y if LV_PREDEFINED_DISPLAY_M5STACK
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default y if LV_PREDEFINED_DISPLAY_ERTFT0356
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default y if LV_PREDEFINED_DISPLAY_TTGO
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default y if LV_PREDEFINED_DISPLAY_TTGO_CAMERA_PLUS
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default y if LV_PREDEFINED_DISPLAY_WT32_SC01
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help
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Some backlights are turned on with a high signal, others held low.
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If enabled, a value of 1 will be sent to the display to enable the backlight,
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otherwise a 0 will be expected to enable it.
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config LV_DISP_PIN_BCKL
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int "GPIO for Backlight Control" if \
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( LV_PREDEFINED_DISPLAY_NONE && ! ( LV_TFT_DISPLAY_CONTROLLER_SH1107 || LV_TFT_DISPLAY_CONTROLLER_SSD1306 ) ) \
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|| LV_PREDEFINED_DISPLAY_RPI_MPI3501
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depends on !LV_DISP_BACKLIGHT_OFF
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default 23 if LV_PREDEFINED_PINS_38V1
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default 26 if LV_PREDEFINED_PINS_38V4
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default 32 if LV_PREDEFINED_DISPLAY_M5STACK
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default 5 if LV_PREDEFINED_DISPLAY_WROVER4
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default 2 if LV_PREDEFINED_DISPLAY_ADA_FEATHERWING
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default 27 if LV_PREDEFINED_DISPLAY_ERTFT0356
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default 0 if LV_PREDEFINED_PINS_TKOALA
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default 4 if LV_PREDEFINED_DISPLAY_TTGO
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default 2 if LV_PREDEFINED_DISPLAY_TTGO_CAMERA_PLUS
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default 23 if LV_PREDEFINED_DISPLAY_WT32_SC01
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default 27
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help
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Configure the display BCLK (LED) pin here.
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config LV_I2C
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bool
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default y if LV_I2C_DISPLAY
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@ -4,8 +4,10 @@
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#include "disp_driver.h"
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#include "disp_spi.h"
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#include "esp_lcd_backlight.h"
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#include "sdkconfig.h"
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void disp_driver_init(void)
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void *disp_driver_init(void)
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{
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#if defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_ILI9341
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ili9341_init();
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@ -42,6 +44,34 @@ void disp_driver_init(void)
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#elif defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_ILI9163C
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ili9163c_init();
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#endif
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// We still use menuconfig for these settings
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// It will be set up during runtime in the future
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#ifndef CONFIG_LV_DISP_BACKLIGHT_OFF
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const disp_backlight_config_t bckl_config = {
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.gpio_num = CONFIG_LV_DISP_PIN_BCKL,
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#if defined CONFIG_LV_DISP_BACKLIGHT_PWM
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.pwm_control = true,
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#else
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.pwm_control = false,
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#endif
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#if defined CONFIG_LV_BACKLIGHT_ACTIVE_LVL
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.output_invert = false, // Backlight on high
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#else
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.output_invert = true, // Backlight on low
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#endif
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.timer_idx = 0,
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.channel_idx = 0 // @todo this prevents us from having two PWM controlled displays
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};
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const disp_backlight_config_t *bckl_config_p = &bckl_config;
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#else
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const disp_backlight_config_t *bckl_config_p = NULL;
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#endif
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disp_backlight_h bckl_handle = disp_backlight_new(bckl_config_p);
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disp_backlight_set(bckl_handle, 100);
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return bckl_handle;
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}
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void disp_driver_flush(lv_disp_drv_t * drv, const lv_area_t * area, lv_color_t * color_map)
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@ -67,7 +67,7 @@ extern "C" {
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**********************/
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/* Initialize display */
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void disp_driver_init(void);
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void *disp_driver_init(void);
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/* Display flush callback */
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void disp_driver_flush(lv_disp_drv_t * drv, const lv_area_t * area, lv_color_t * color_map);
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@ -8,51 +8,95 @@
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*********************/
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#include "esp_lcd_backlight.h"
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#include "driver/ledc.h"
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#include "driver/gpio.h"
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#include "esp_log.h"
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#include "esp_rom_gpio.h" // for output signal inversion
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static const char *TAG = "disp_brightness";
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typedef struct {
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bool pwm_control; // true: LEDC is used, false: GPIO is used
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int index; // Either GPIO or LEDC channel
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} disp_backlight_t;
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void disp_brightness_control_enable(void)
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static const char *TAG = "disp_backlight";
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disp_backlight_h disp_backlight_new(const disp_backlight_config_t *config)
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{
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/*
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Configure LED (Backlight) pin as PWM for Brightness control.
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*/
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ledc_channel_config_t LCD_backlight_channel = {
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.gpio_num = DISP_PIN_BCKL,
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if (config == NULL)
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return NULL;
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disp_backlight_t *bckl_dev = calloc(1, sizeof(disp_backlight_t));
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if (bckl_dev == NULL){
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ESP_LOGW(TAG, "Could not create new LCD backlight instance");
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return NULL;
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}
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if (config->pwm_control){
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// Configure LED (Backlight) pin as PWM for Brightness control.
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bckl_dev->pwm_control = true;
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bckl_dev->index = config->channel_idx;
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const ledc_channel_config_t LCD_backlight_channel = {
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.gpio_num = config->gpio_num,
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.speed_mode = LEDC_LOW_SPEED_MODE,
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.channel = LEDC_CHANNEL_0,
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.channel = config->channel_idx,
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.intr_type = LEDC_INTR_DISABLE,
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.timer_sel = LEDC_TIMER_0,
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.timer_sel = config->timer_idx,
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.duty = 0,
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.hpoint = 0,
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.flags.output_invert = 0
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.flags.output_invert = config->output_invert //@todo added only in recent IDF versions
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};
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ledc_timer_config_t LCD_backlight_timer = {
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const ledc_timer_config_t LCD_backlight_timer = {
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.speed_mode = LEDC_LOW_SPEED_MODE,
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.bit_num = LEDC_TIMER_10_BIT,
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.timer_num = LEDC_TIMER_0,
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.timer_num = config->timer_idx,
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.freq_hz = 5000,
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.clk_cfg = LEDC_AUTO_CLK
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};
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.clk_cfg = LEDC_AUTO_CLK};
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ESP_ERROR_CHECK( ledc_timer_config(&LCD_backlight_timer) );
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ESP_ERROR_CHECK( ledc_channel_config(&LCD_backlight_channel) );
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}
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void disp_set_brightness(uint16_t brightness)
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{
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/*
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Set brightness.
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0 -> Display off
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100 -> Full brightness
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NOTE: brightness value must be between 0 - 100
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*/
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if(brightness > 100)
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{
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ESP_LOGE(TAG, "Brightness value must be between 0 - 100");
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return;
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ESP_ERROR_CHECK(ledc_timer_config(&LCD_backlight_timer));
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ESP_ERROR_CHECK(ledc_channel_config(&LCD_backlight_channel));
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}
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ESP_ERROR_CHECK( ledc_set_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0, brightness*10) );
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ESP_ERROR_CHECK( ledc_update_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0) );
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else
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{
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// Configure GPIO for output
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bckl_dev->index = config->gpio_num;
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gpio_pad_select_gpio(config->gpio_num);
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ESP_ERROR_CHECK(gpio_set_direction(config->gpio_num, GPIO_MODE_OUTPUT));
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esp_rom_gpio_connect_out_signal(config->gpio_num, SIG_GPIO_OUT_IDX, config->output_invert, false);
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}
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return (disp_backlight_h)bckl_dev;
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}
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void disp_backlight_set(disp_backlight_h bckl, int brightness_percent)
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{
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// Check input paramters
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if (bckl == NULL)
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return;
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if (brightness_percent > 100)
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brightness_percent = 100;
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if (brightness_percent < 0)
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brightness_percent = 0;
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disp_backlight_t *bckl_dev = (disp_backlight_t *) bckl;
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ESP_LOGI(TAG, "Setting LCD backlight: %d%%", brightness_percent);
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if (bckl_dev->pwm_control) {
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uint32_t duty_cycle = (1023 * brightness_percent) / 100; // LEDC resolution set to 10bits, thus: 100% = 1023
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ESP_ERROR_CHECK(ledc_set_duty(LEDC_LOW_SPEED_MODE, bckl_dev->index, duty_cycle));
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ESP_ERROR_CHECK(ledc_update_duty(LEDC_LOW_SPEED_MODE, bckl_dev->index));
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} else {
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ESP_ERROR_CHECK(gpio_set_level(bckl_dev->index, brightness_percent));
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}
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}
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void disp_backlight_delete(disp_backlight_h bckl)
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{
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if (bckl == NULL)
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return;
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disp_backlight_t *bckl_dev = (disp_backlight_t *) bckl;
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if (bckl_dev->pwm_control) {
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ledc_stop(LEDC_LOW_SPEED_MODE, bckl_dev->index, 0);
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} else {
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gpio_reset_pin(bckl_dev->index);
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}
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free (bckl);
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}
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@ -9,26 +9,55 @@
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* INCLUDES
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*********************/
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#include <stdbool.h>
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#ifdef LV_LVGL_H_INCLUDE_SIMPLE
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#include "lvgl.h"
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#else
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#include "lvgl/lvgl.h"
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#endif
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/*********************
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* DEFINES
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*********************/
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#if CONFIG_LV_ENABLE_BACKLIGHT_CONTROL
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#define DISP_PIN_BCKL CONFIG_LV_DISP_PIN_BCKL
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#ifdef __cplusplus
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extern "C" { /* extern "C" */
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#endif
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/**********************
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* GLOBAL PROTOTYPES
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**********************/
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void disp_brightness_control_enable(void);
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void disp_set_brightness(uint16_t brightness);
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/**
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* @brief Display backlight controller handle
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*
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*/
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typedef void * disp_backlight_h;
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/**
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* @brief Configuration structure of backlight controller
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*
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*/
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typedef struct {
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bool pwm_control;
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bool output_invert;
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int gpio_num; // see gpio_num_t
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// Relevant only for PWM controlled backlight
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// Ignored for switch (ON/OFF) backlight control
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int timer_idx; // ledc_timer_t
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int channel_idx; // ledc_channel_t
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} disp_backlight_config_t;
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/**
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* @brief Create new backlight controller
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*
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* @param[in] config Configuration structure of backlight controller
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* @return Display backlight controller handle
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*/
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disp_backlight_h disp_backlight_new(const disp_backlight_config_t *config);
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/**
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* @brief Set backlight
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*
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* Brightness parameter can be 0-100 for PWM controlled backlight.
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* GPIO controlled backlight (ON/OFF) is turned off witch value 0 and turned on with any positive value.
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*
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* @param bckl Backlight controller handle
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* @param[in] brightness_percent Brightness in [%]
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*/
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void disp_backlight_set(disp_backlight_h bckl, int brightness_percent);
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void disp_backlight_delete(disp_backlight_h bckl);
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#ifdef __cplusplus
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} /* extern "C" */
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