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firmware: Split LCD logic into separate file

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This commit is contained in:
Jack O'Sullivan 2024-12-09 14:54:11 +00:00
parent 768ee410d8
commit 475f5626dd
9 changed files with 315 additions and 254 deletions
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2
firmware/main/CMakeLists.txt
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@ -1,3 +1,3 @@
idf_component_register(
SRCS "valconomy.c" "ui.c" "usb.c"
SRCS "valconomy.c" "ui.c" "lcd.c" "usb.c"
INCLUDE_DIRS ".")

13
firmware/main/common.h Normal file
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@ -0,0 +1,13 @@
#pragma once
#include <inttypes.h>
#include "driver/i2c_master.h"
#define SCL_SPEED 100000
#define LCD_HRES 800
#define LCD_VRES 480
extern i2c_master_bus_handle_t i2c_bus_handle;
extern i2c_master_dev_handle_t exio_cfg_handle, exio_o_handle;

255
firmware/main/lcd.c Normal file
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@ -0,0 +1,255 @@
#include <inttypes.h>
#include "sdkconfig.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_err.h"
#include "esp_log.h"
#include "esp_timer.h"
#include "esp_lcd_panel_ops.h"
#include "esp_lcd_panel_rgb.h"
#include "driver/i2c_master.h"
#include "esp_lcd_touch_gt911.h"
#include "lvgl.h"
#include "common.h"
#include "lcd.h"
#define LCD_PIXEL_SIZE 2
// in ms
#define LVGL_TICK_PERIOD 2
#define LVGL_TASK_MAX_DELAY 500
#define LVGL_TASK_MIN_DELAY 1
#define LVGL_TASK_PRIORITY 2
#define LVGL_TASK_STACK_SIZE (8 * 1024)
static const char *TAG = "valconomy-lcd";
// LVGL library is not thread-safe, we will call LVGL APIs from different tasks, so use a mutex to protect it
static SemaphoreHandle_t lvgl_mtx = NULL;
static bool val_on_vsync(esp_lcd_panel_handle_t panel, const esp_lcd_rgb_panel_event_data_t *event_data, void *user_ctx) {
return false;
}
static void val_lvgl_flush_cb(lv_display_t *disp, const lv_area_t *area, uint8_t *px_map) {
esp_lcd_panel_handle_t panel_handle = lv_display_get_user_data(disp);
// pass the draw buffer to the driver
esp_lcd_panel_draw_bitmap(panel_handle, area->x1, area->y1, area->x2 + 1, area->y2 + 1, px_map);
lv_disp_flush_ready(disp);
}
static void val_increase_lvgl_tick(void *arg) {
/* Tell LVGL how many milliseconds has elapsed */
lv_tick_inc(LVGL_TICK_PERIOD);
}
static void val_lvgl_port_task(void *arg) {
ESP_LOGI(TAG, "Starting LVGL task");
uint32_t task_delay_ms = LVGL_TASK_MAX_DELAY;
while (1) {
// Lock the mutex due to the LVGL APIs are not thread-safe
if (val_lvgl_lock(-1)) {
task_delay_ms = lv_timer_handler();
// Release the mutex
val_lvgl_unlock();
}
if (task_delay_ms > LVGL_TASK_MAX_DELAY) {
task_delay_ms = LVGL_TASK_MAX_DELAY;
} else if (task_delay_ms < LVGL_TASK_MIN_DELAY) {
task_delay_ms = LVGL_TASK_MIN_DELAY;
}
vTaskDelay(pdMS_TO_TICKS(task_delay_ms));
}
}
static void val_lvgl_touch_read(lv_indev_t *indev, lv_indev_data_t *data) {
uint16_t touchpad_x[1] = {0};
uint16_t touchpad_y[1] = {0};
uint8_t touchpad_cnt = 0;
// Read touch controller data
esp_lcd_touch_handle_t touch_panel = lv_indev_get_user_data(indev);
esp_lcd_touch_read_data(touch_panel);
// Get coordinates
bool touchpad_pressed = esp_lcd_touch_get_coordinates(touch_panel, touchpad_x, touchpad_y, NULL, &touchpad_cnt, 1);
if (touchpad_pressed && touchpad_cnt > 0) {
data->point.x = touchpad_x[0];
data->point.y = touchpad_y[0];
data->state = LV_INDEV_STATE_PR;
} else {
data->state = LV_INDEV_STATE_REL;
}
}
bool val_lvgl_lock(int timeout_ms) {
// Convert timeout in milliseconds to FreeRTOS ticks
// If `timeout_ms` is set to -1, the program will block until the condition is met
const TickType_t timeout_ticks = (timeout_ms == -1) ? portMAX_DELAY : pdMS_TO_TICKS(timeout_ms);
return xSemaphoreTakeRecursive(lvgl_mtx, timeout_ticks) == pdTRUE;
}
void val_lvgl_unlock(void) {
xSemaphoreGiveRecursive(lvgl_mtx);
}
esp_lcd_touch_handle_t val_setup_touch(void) {
ESP_LOGI(TAG, "Install touch panel driver");
esp_lcd_panel_io_i2c_config_t io_config = ESP_LCD_TOUCH_IO_I2C_GT911_CONFIG();
io_config.scl_speed_hz = SCL_SPEED;
esp_lcd_panel_io_handle_t io_handle = NULL;
ESP_ERROR_CHECK(esp_lcd_new_panel_io_i2c(i2c_bus_handle, &io_config, &io_handle));
esp_lcd_touch_io_gt911_config_t gt911_config = {
.dev_addr = io_config.dev_addr,
};
esp_lcd_touch_config_t tp_cfg = {
.x_max = LCD_HRES,
.y_max = LCD_VRES,
.rst_gpio_num = -1,
.int_gpio_num = 4,
.levels = {
.reset = 0,
.interrupt = 0,
},
.flags = {
.swap_xy = 0,
.mirror_x = 0,
.mirror_y = 0,
},
.driver_data = &gt911_config,
};
esp_lcd_touch_handle_t tp;
ESP_ERROR_CHECK(esp_lcd_touch_new_i2c_gt911(io_handle, &tp_cfg, &tp));
return tp;
}
esp_lcd_panel_handle_t val_setup_lcd(void) {
uint8_t i2c_b;
i2c_b = 0x01; // Output enable
ESP_ERROR_CHECK(i2c_master_transmit(exio_cfg_handle, &i2c_b, 1, -1));
i2c_b = 0x00; // Reset everything
ESP_ERROR_CHECK(i2c_master_transmit(exio_o_handle, &i2c_b, 1, -1));
vTaskDelay(pdMS_TO_TICKS(10));
i2c_b = 0x0c; // Pull LCD + touch out of reset
ESP_ERROR_CHECK(i2c_master_transmit(exio_o_handle, &i2c_b, 1, -1));
vTaskDelay(pdMS_TO_TICKS(100));
ESP_LOGI(TAG, "Install RGB LCD panel driver");
esp_lcd_panel_handle_t panel_handle = NULL;
esp_lcd_rgb_panel_config_t panel_config = {
.data_width = 16, // RGB565
.psram_trans_align = 64,
.num_fbs = 2,
.clk_src = LCD_CLK_SRC_DEFAULT,
.disp_gpio_num = -1, // Only accessible via GPIO expander
.pclk_gpio_num = 7,
.vsync_gpio_num = 3,
.hsync_gpio_num = 46,
.de_gpio_num = 5,
.data_gpio_nums = {
14, // B3
38, // B4
18, // B5
17, // B6
10, // B7
39, // G2
0, // G3
45, // G4
48, // G5
47, // G6
21, // G7
1, // R3
2, // R4
42, // R5
41, // R6
40, // R7
},
.timings = {
.pclk_hz = 18 * 1000 * 1000, // 18000000 / (hs+hbp+hfp+hres) / (vs+vbp+hfp+vres) = ~42Hz
.h_res = LCD_HRES,
.v_res = LCD_VRES,
.hsync_back_porch = 8,
.hsync_front_porch = 8,
.hsync_pulse_width = 4,
.vsync_back_porch = 16,
.vsync_front_porch = 16,
.vsync_pulse_width = 4,
.flags = {
.pclk_active_neg = true,
},
},
.flags.fb_in_psram = true, // allocate frame buffer in PSRAM
};
ESP_ERROR_CHECK(esp_lcd_new_rgb_panel(&panel_config, &panel_handle));
ESP_LOGI(TAG, "Initialize RGB LCD panel");
ESP_ERROR_CHECK(esp_lcd_panel_reset(panel_handle));
ESP_ERROR_CHECK(esp_lcd_panel_init(panel_handle));
ESP_LOGI(TAG, "Turn on LCD backlight");
i2c_b = 0x0e; // LCD + touch out of reset, backlight on
ESP_ERROR_CHECK(i2c_master_transmit(exio_o_handle, &i2c_b, 1, -1));
return panel_handle;
}
lv_display_t *val_setup_lvgl(esp_lcd_panel_handle_t lcd_panel, esp_lcd_touch_handle_t touch_panel) {
ESP_LOGI(TAG, "Initialize LVGL library");
lv_init();
// create a lvgl display
lv_display_t *display = lv_display_create(LCD_HRES, LCD_VRES);
// associate the rgb panel handle to the display
lv_display_set_user_data(display, lcd_panel);
// set color depth
lv_display_set_color_format(display, LV_COLOR_FORMAT_RGB565);
// create draw buffers
void *buf1 = NULL;
void *buf2 = NULL;
ESP_LOGI(TAG, "Use frame buffers as LVGL draw buffers");
ESP_ERROR_CHECK(esp_lcd_rgb_panel_get_frame_buffer(lcd_panel, 2, &buf1, &buf2));
// set LVGL draw buffers and direct mode
lv_display_set_buffers(display, buf1, buf2, LCD_HRES * LCD_VRES * LCD_PIXEL_SIZE, LV_DISPLAY_RENDER_MODE_DIRECT);
// set the callback which can copy the rendered image to an area of the display
lv_display_set_flush_cb(display, val_lvgl_flush_cb);
ESP_LOGI(TAG, "Register event callbacks");
esp_lcd_rgb_panel_event_callbacks_t cbs = {
.on_vsync = val_on_vsync,
};
ESP_ERROR_CHECK(esp_lcd_rgb_panel_register_event_callbacks(lcd_panel, &cbs, display));
lv_indev_t *indev = lv_indev_create();
lv_indev_set_user_data(indev, touch_panel);
lv_indev_set_type(indev, LV_INDEV_TYPE_POINTER);
lv_indev_set_read_cb(indev, val_lvgl_touch_read);
ESP_LOGI(TAG, "Install LVGL tick timer");
// Tick interface for LVGL (using esp_timer to generate 2ms periodic event)
const esp_timer_create_args_t lvgl_tick_timer_args = {
.callback = &val_increase_lvgl_tick,
.name = "lvgl_tick"
};
esp_timer_handle_t lvgl_tick_timer = NULL;
ESP_ERROR_CHECK(esp_timer_create(&lvgl_tick_timer_args, &lvgl_tick_timer));
ESP_ERROR_CHECK(esp_timer_start_periodic(lvgl_tick_timer, LVGL_TICK_PERIOD * 1000));
lvgl_mtx = xSemaphoreCreateRecursiveMutex();
assert(lvgl_mtx);
ESP_LOGI(TAG, "Create LVGL task");
xTaskCreate(val_lvgl_port_task, "LVGL", LVGL_TASK_STACK_SIZE, NULL, LVGL_TASK_PRIORITY, NULL);
return display;
}

16
firmware/main/lcd.h Normal file
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@ -0,0 +1,16 @@
#pragma once
#include <inttypes.h>
#include "esp_lcd_panel_ops.h"
#include "esp_lcd_panel_rgb.h"
#include "esp_lcd_touch_gt911.h"
#include "lvgl.h"
bool val_lvgl_lock(int timeout_ms);
void val_lvgl_unlock(void);
esp_lcd_touch_handle_t val_setup_touch(void);
esp_lcd_panel_handle_t val_setup_lcd(void);
lv_display_t *val_setup_lvgl(esp_lcd_panel_handle_t lcd_panel, esp_lcd_touch_handle_t touch_panel);

2
firmware/main/ui.c
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@ -1,5 +1,7 @@
#include "lvgl.h"
#include "ui.h"
static const lv_font_t *font_normal = &lv_font_montserrat_14;
static void b_cfg_cb(lv_event_t *e) {

5
firmware/main/ui.h Normal file
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@ -0,0 +1,5 @@
#pragma once
#include "lvgl.h"
void val_lvgl_ui(lv_display_t *disp);

3
firmware/main/usb.c
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@ -6,6 +6,9 @@
#include "tinyusb.h"
#include "class/hid/hid_device.h"
#include "common.h"
#include "usb.h"
#define TUSB_DESC_TOTAL_LEN (TUD_CONFIG_DESC_LEN + CFG_TUD_HID * TUD_HID_DESC_LEN)
static const char *TAG = "valconomy-usb";

5
firmware/main/usb.h Normal file
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@ -0,0 +1,5 @@
#pragma once
#include "tinyusb_types.h"
void val_usb_init(void);

268
firmware/main/valconomy.c
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@ -6,106 +6,20 @@
#include "esp_err.h"
#include "esp_log.h"
#include "esp_timer.h"
#include "driver/i2c_master.h"
#include "esp_lcd_panel_ops.h"
#include "esp_lcd_panel_rgb.h"
#include "esp_lcd_touch_gt911.h"
#include "driver/i2c_master.h"
#include "lvgl.h"
#define SCL_SPEED 100000
#define LCD_HRES 800
#define LCD_VRES 480
#define LCD_PIXEL_SIZE 2
// in ms
#define LVGL_TICK_PERIOD 2
#define LVGL_TASK_MAX_DELAY 500
#define LVGL_TASK_MIN_DELAY 1
#define LVGL_TASK_PRIORITY 2
#define LVGL_TASK_STACK_SIZE (8 * 1024)
#include "common.h"
#include "usb.h"
#include "lcd.h"
#include "ui.h"
static const char *TAG = "valconomy";
static i2c_master_bus_handle_t i2c_bus_handle;
static i2c_master_dev_handle_t exio_cfg_handle, exio_o_handle;
// LVGL library is not thread-safe, we will call LVGL APIs from different tasks, so use a mutex to protect it
static SemaphoreHandle_t lvgl_mtx = NULL;
extern void val_usb_init(void);
extern void val_lvgl_ui(lv_display_t *disp);
bool val_lvgl_lock(int timeout_ms) {
// Convert timeout in milliseconds to FreeRTOS ticks
// If `timeout_ms` is set to -1, the program will block until the condition is met
const TickType_t timeout_ticks = (timeout_ms == -1) ? portMAX_DELAY : pdMS_TO_TICKS(timeout_ms);
return xSemaphoreTakeRecursive(lvgl_mtx, timeout_ticks) == pdTRUE;
}
void val_lvgl_unlock(void) {
xSemaphoreGiveRecursive(lvgl_mtx);
}
static bool val_on_vsync(esp_lcd_panel_handle_t panel, const esp_lcd_rgb_panel_event_data_t *event_data, void *user_ctx) {
return false;
}
static void val_lvgl_flush_cb(lv_display_t *disp, const lv_area_t *area, uint8_t *px_map) {
esp_lcd_panel_handle_t panel_handle = lv_display_get_user_data(disp);
// pass the draw buffer to the driver
esp_lcd_panel_draw_bitmap(panel_handle, area->x1, area->y1, area->x2 + 1, area->y2 + 1, px_map);
lv_disp_flush_ready(disp);
}
static void val_increase_lvgl_tick(void *arg) {
/* Tell LVGL how many milliseconds has elapsed */
lv_tick_inc(LVGL_TICK_PERIOD);
}
static void val_lvgl_port_task(void *arg) {
ESP_LOGI(TAG, "Starting LVGL task");
uint32_t task_delay_ms = LVGL_TASK_MAX_DELAY;
while (1) {
// Lock the mutex due to the LVGL APIs are not thread-safe
if (val_lvgl_lock(-1)) {
task_delay_ms = lv_timer_handler();
// Release the mutex
val_lvgl_unlock();
}
if (task_delay_ms > LVGL_TASK_MAX_DELAY) {
task_delay_ms = LVGL_TASK_MAX_DELAY;
} else if (task_delay_ms < LVGL_TASK_MIN_DELAY) {
task_delay_ms = LVGL_TASK_MIN_DELAY;
}
vTaskDelay(pdMS_TO_TICKS(task_delay_ms));
}
}
static void val_lvgl_touch_read(lv_indev_t *indev, lv_indev_data_t *data) {
uint16_t touchpad_x[1] = {0};
uint16_t touchpad_y[1] = {0};
uint8_t touchpad_cnt = 0;
// Read touch controller data
esp_lcd_touch_handle_t touch_panel = lv_indev_get_user_data(indev);
esp_lcd_touch_read_data(touch_panel);
// Get coordinates
bool touchpad_pressed = esp_lcd_touch_get_coordinates(touch_panel, touchpad_x, touchpad_y, NULL, &touchpad_cnt, 1);
if (touchpad_pressed && touchpad_cnt > 0) {
data->point.x = touchpad_x[0];
data->point.y = touchpad_y[0];
data->state = LV_INDEV_STATE_PR;
} else {
data->state = LV_INDEV_STATE_REL;
}
}
i2c_master_bus_handle_t i2c_bus_handle;
i2c_master_dev_handle_t exio_cfg_handle, exio_o_handle;
static void val_i2c_master_init(void) {
ESP_LOGI(TAG, "Init I2C");
@ -131,165 +45,6 @@ static void val_i2c_master_init(void) {
ESP_ERROR_CHECK(i2c_master_bus_add_device(i2c_bus_handle, &exio_dev_cfg, &exio_o_handle));
}
static esp_lcd_touch_handle_t val_setup_touch(void) {
ESP_LOGI(TAG, "Install touch panel driver");
esp_lcd_panel_io_i2c_config_t io_config = ESP_LCD_TOUCH_IO_I2C_GT911_CONFIG();
io_config.scl_speed_hz = SCL_SPEED;
esp_lcd_panel_io_handle_t io_handle = NULL;
ESP_ERROR_CHECK(esp_lcd_new_panel_io_i2c(i2c_bus_handle, &io_config, &io_handle));
esp_lcd_touch_io_gt911_config_t gt911_config = {
.dev_addr = io_config.dev_addr,
};
esp_lcd_touch_config_t tp_cfg = {
.x_max = LCD_HRES,
.y_max = LCD_VRES,
.rst_gpio_num = -1,
.int_gpio_num = 4,
.levels = {
.reset = 0,
.interrupt = 0,
},
.flags = {
.swap_xy = 0,
.mirror_x = 0,
.mirror_y = 0,
},
.driver_data = &gt911_config,
};
esp_lcd_touch_handle_t tp;
ESP_ERROR_CHECK(esp_lcd_touch_new_i2c_gt911(io_handle, &tp_cfg, &tp));
return tp;
}
static esp_lcd_panel_handle_t val_setup_lcd(void) {
uint8_t i2c_b;
i2c_b = 0x01; // Output enable
ESP_ERROR_CHECK(i2c_master_transmit(exio_cfg_handle, &i2c_b, 1, -1));
i2c_b = 0x00; // Reset everything
ESP_ERROR_CHECK(i2c_master_transmit(exio_o_handle, &i2c_b, 1, -1));
vTaskDelay(pdMS_TO_TICKS(10));
i2c_b = 0x0c; // Pull LCD + touch out of reset
ESP_ERROR_CHECK(i2c_master_transmit(exio_o_handle, &i2c_b, 1, -1));
vTaskDelay(pdMS_TO_TICKS(100));
ESP_LOGI(TAG, "Install RGB LCD panel driver");
esp_lcd_panel_handle_t panel_handle = NULL;
esp_lcd_rgb_panel_config_t panel_config = {
.data_width = 16, // RGB565
.psram_trans_align = 64,
.num_fbs = 2,
.clk_src = LCD_CLK_SRC_DEFAULT,
.disp_gpio_num = -1, // Only accessible via GPIO expander
.pclk_gpio_num = 7,
.vsync_gpio_num = 3,
.hsync_gpio_num = 46,
.de_gpio_num = 5,
.data_gpio_nums = {
14, // B3
38, // B4
18, // B5
17, // B6
10, // B7
39, // G2
0, // G3
45, // G4
48, // G5
47, // G6
21, // G7
1, // R3
2, // R4
42, // R5
41, // R6
40, // R7
},
.timings = {
.pclk_hz = 18 * 1000 * 1000, // 18000000 / (hs+hbp+hfp+hres) / (vs+vbp+hfp+vres) = ~42Hz
.h_res = LCD_HRES,
.v_res = LCD_VRES,
.hsync_back_porch = 8,
.hsync_front_porch = 8,
.hsync_pulse_width = 4,
.vsync_back_porch = 16,
.vsync_front_porch = 16,
.vsync_pulse_width = 4,
.flags = {
.pclk_active_neg = true,
},
},
.flags.fb_in_psram = true, // allocate frame buffer in PSRAM
};
ESP_ERROR_CHECK(esp_lcd_new_rgb_panel(&panel_config, &panel_handle));
ESP_LOGI(TAG, "Initialize RGB LCD panel");
ESP_ERROR_CHECK(esp_lcd_panel_reset(panel_handle));
ESP_ERROR_CHECK(esp_lcd_panel_init(panel_handle));
ESP_LOGI(TAG, "Turn on LCD backlight");
i2c_b = 0x0e; // LCD + touch out of reset, backlight on
ESP_ERROR_CHECK(i2c_master_transmit(exio_o_handle, &i2c_b, 1, -1));
return panel_handle;
}
void val_setup_lvgl(esp_lcd_panel_handle_t lcd_panel, esp_lcd_touch_handle_t touch_panel) {
ESP_LOGI(TAG, "Initialize LVGL library");
lv_init();
// create a lvgl display
lv_display_t *display = lv_display_create(LCD_HRES, LCD_VRES);
// associate the rgb panel handle to the display
lv_display_set_user_data(display, lcd_panel);
// set color depth
lv_display_set_color_format(display, LV_COLOR_FORMAT_RGB565);
// create draw buffers
void *buf1 = NULL;
void *buf2 = NULL;
ESP_LOGI(TAG, "Use frame buffers as LVGL draw buffers");
ESP_ERROR_CHECK(esp_lcd_rgb_panel_get_frame_buffer(lcd_panel, 2, &buf1, &buf2));
// set LVGL draw buffers and direct mode
lv_display_set_buffers(display, buf1, buf2, LCD_HRES * LCD_VRES * LCD_PIXEL_SIZE, LV_DISPLAY_RENDER_MODE_DIRECT);
// set the callback which can copy the rendered image to an area of the display
lv_display_set_flush_cb(display, val_lvgl_flush_cb);
ESP_LOGI(TAG, "Register event callbacks");
esp_lcd_rgb_panel_event_callbacks_t cbs = {
.on_vsync = val_on_vsync,
};
ESP_ERROR_CHECK(esp_lcd_rgb_panel_register_event_callbacks(lcd_panel, &cbs, display));
lv_indev_t *indev = lv_indev_create();
lv_indev_set_user_data(indev, touch_panel);
lv_indev_set_type(indev, LV_INDEV_TYPE_POINTER);
lv_indev_set_read_cb(indev, val_lvgl_touch_read);
ESP_LOGI(TAG, "Install LVGL tick timer");
// Tick interface for LVGL (using esp_timer to generate 2ms periodic event)
const esp_timer_create_args_t lvgl_tick_timer_args = {
.callback = &val_increase_lvgl_tick,
.name = "lvgl_tick"
};
esp_timer_handle_t lvgl_tick_timer = NULL;
ESP_ERROR_CHECK(esp_timer_create(&lvgl_tick_timer_args, &lvgl_tick_timer));
ESP_ERROR_CHECK(esp_timer_start_periodic(lvgl_tick_timer, LVGL_TICK_PERIOD * 1000));
lvgl_mtx = xSemaphoreCreateRecursiveMutex();
assert(lvgl_mtx);
ESP_LOGI(TAG, "Create LVGL task");
xTaskCreate(val_lvgl_port_task, "LVGL", LVGL_TASK_STACK_SIZE, NULL, LVGL_TASK_PRIORITY, NULL);
ESP_LOGI(TAG, "Display LVGL UI");
// Lock the mutex due to the LVGL APIs are not thread-safe
assert(val_lvgl_lock(-1));
val_lvgl_ui(display);
val_lvgl_unlock();
}
void app_main(void) {
val_i2c_master_init();
@ -300,5 +55,12 @@ void app_main(void) {
esp_lcd_touch_handle_t touch_panel = val_setup_touch();
assert(touch_panel);
val_setup_lvgl(lcd_panel, touch_panel);
lv_display_t *display = val_setup_lvgl(lcd_panel, touch_panel);
assert(display);
ESP_LOGI(TAG, "Display LVGL UI");
// Lock the mutex due to the LVGL APIs are not thread-safe
assert(val_lvgl_lock(-1));
val_lvgl_ui(display);
val_lvgl_unlock();
}