Description
I’m a newbie with LVGL. I met difficulties when trying to compile my main.c code for ESP32 with lvgl lib. The lv_port_esp32 can be compiled smoothly and works fine on my ESP32 board.
However, I met kinds of errors when I try to use the example code to modify the main file to test the example code for one buttom.
My question is:
Which line of the original
main.cfile should I start to modify?What steps should I follow if I want to test the one buttom example code on my board?
What MCU/Processor/Board and compiler are you using?
- MCU: Espressif ESP32
- ILI9341 as TFT controller
- XPT2046
What do you want to achieve?
modify the lv_port_esp32 and test the one buttom example code in this link
What have you tried so far?
- Git clone the
lv_port_esp32repository - Configure ESP-IDF vscode extension & vsCode.
- Successfully compile and run the
lv_port_esp32demo on my board. - Edit the
lv_port_esp32/main/main.cfile
Code in the original main.c file
The code below can run smoothly on my board. How to modify it?
/* LVGL Example project
*
* Basic project to test LVGL on ESP32 based projects.
*
* This example code is in the Public Domain (or CC0 licensed, at your option.)
*
* Unless required by applicable law or agreed to in writing, this
* software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
* CONDITIONS OF ANY KIND, either express or implied.
*/
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_freertos_hooks.h"
#include "freertos/semphr.h"
#include "esp_system.h"
#include "driver/gpio.h"
/* Littlevgl specific */
#ifdef LV_LVGL_H_INCLUDE_SIMPLE
#include "lvgl.h"
#else
#include "lvgl/lvgl.h"
#endif
#include "lvgl_helpers.h"
#ifndef CONFIG_LV_TFT_DISPLAY_MONOCHROME
#if defined CONFIG_LV_USE_DEMO_WIDGETS
#include "lv_examples/src/lv_demo_widgets/lv_demo_widgets.h"
#elif defined CONFIG_LV_USE_DEMO_KEYPAD_AND_ENCODER
#include "lv_examples/src/lv_demo_keypad_encoder/lv_demo_keypad_encoder.h"
#elif defined CONFIG_LV_USE_DEMO_BENCHMARK
#include "lv_examples/src/lv_demo_benchmark/lv_demo_benchmark.h"
#elif defined CONFIG_LV_USE_DEMO_STRESS
#include "lv_examples/src/lv_demo_stress/lv_demo_stress.h"
#else
#error "No demo application selected."
#endif
#endif
/*********************
* DEFINES
*********************/
#define TAG "demo"
#define LV_TICK_PERIOD_MS 1
/**********************
* STATIC PROTOTYPES
**********************/
static void lv_tick_task(void *arg);
static void guiTask(void *pvParameter);
static void create_demo_application(void);
/**********************
* APPLICATION MAIN
**********************/
void app_main() {
/* If you want to use a task to create the graphic, you NEED to create a Pinned task
* Otherwise there can be problem such as memory corruption and so on.
* NOTE: When not using Wi-Fi nor Bluetooth you can pin the guiTask to core 0 */
xTaskCreatePinnedToCore(guiTask, "gui", 4096*2, NULL, 0, NULL, 1);
}
/* Creates a semaphore to handle concurrent call to lvgl stuff
* If you wish to call *any* lvgl function from other threads/tasks
* you should lock on the very same semaphore! */
SemaphoreHandle_t xGuiSemaphore;
static void guiTask(void *pvParameter) {
(void) pvParameter;
xGuiSemaphore = xSemaphoreCreateMutex();
lv_init();
/* Initialize SPI or I2C bus used by the drivers */
lvgl_driver_init();
lv_color_t* buf1 = heap_caps_malloc(DISP_BUF_SIZE * sizeof(lv_color_t), MALLOC_CAP_DMA);
assert(buf1 != NULL);
/* Use double buffered when not working with monochrome displays */
#ifndef CONFIG_LV_TFT_DISPLAY_MONOCHROME
lv_color_t* buf2 = heap_caps_malloc(DISP_BUF_SIZE * sizeof(lv_color_t), MALLOC_CAP_DMA);
assert(buf2 != NULL);
#else
static lv_color_t *buf2 = NULL;
#endif
static lv_disp_buf_t disp_buf;
uint32_t size_in_px = DISP_BUF_SIZE;
#if defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_IL3820 \
|| defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_JD79653A \
|| defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_UC8151D \
|| defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_SSD1306
/* Actual size in pixels, not bytes. */
size_in_px *= 8;
#endif
/* Initialize the working buffer depending on the selected display.
* NOTE: buf2 == NULL when using monochrome displays. */
lv_disp_buf_init(&disp_buf, buf1, buf2, size_in_px);
lv_disp_drv_t disp_drv;
lv_disp_drv_init(&disp_drv);
disp_drv.flush_cb = disp_driver_flush;
/* When using a monochrome display we need to register the callbacks:
* - rounder_cb
* - set_px_cb */
#ifdef CONFIG_LV_TFT_DISPLAY_MONOCHROME
disp_drv.rounder_cb = disp_driver_rounder;
disp_drv.set_px_cb = disp_driver_set_px;
#endif
disp_drv.buffer = &disp_buf;
lv_disp_drv_register(&disp_drv);
/* Register an input device when enabled on the menuconfig */
#if CONFIG_LV_TOUCH_CONTROLLER != TOUCH_CONTROLLER_NONE
lv_indev_drv_t indev_drv;
lv_indev_drv_init(&indev_drv);
indev_drv.read_cb = touch_driver_read;
indev_drv.type = LV_INDEV_TYPE_POINTER;
lv_indev_drv_register(&indev_drv);
#endif
/* Create and start a periodic timer interrupt to call lv_tick_inc */
const esp_timer_create_args_t periodic_timer_args = {
.callback = &lv_tick_task,
.name = "periodic_gui"
};
esp_timer_handle_t periodic_timer;
ESP_ERROR_CHECK(esp_timer_create(&periodic_timer_args, &periodic_timer));
ESP_ERROR_CHECK(esp_timer_start_periodic(periodic_timer, LV_TICK_PERIOD_MS * 1000));
/* Create the demo application */
create_demo_application();
// lv_example_get_started_1();
while (1) {
/* Delay 1 tick (assumes FreeRTOS tick is 10ms */
vTaskDelay(pdMS_TO_TICKS(10));
/* Try to take the semaphore, call lvgl related function on success */
if (pdTRUE == xSemaphoreTake(xGuiSemaphore, portMAX_DELAY)) {
lv_task_handler();
xSemaphoreGive(xGuiSemaphore);
}
}
/* A task should NEVER return */
free(buf1);
#ifndef CONFIG_LV_TFT_DISPLAY_MONOCHROME
free(buf2);
#endif
vTaskDelete(NULL);
}
static void create_demo_application(void)
{
/* When using a monochrome display we only show "Hello World" centered on the
* screen */
#if defined CONFIG_LV_TFT_DISPLAY_MONOCHROME || \
defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_ST7735S
/* use a pretty small demo for monochrome displays */
/* Get the current screen */
lv_obj_t * scr = lv_disp_get_scr_act(NULL);
/*Create a Label on the currently active screen*/
lv_obj_t * label1 = lv_label_create(scr, NULL);
/*Modify the Label's text*/
lv_label_set_text(label1, "Hello\nworld");
/* Align the Label to the center
* NULL means align on parent (which is the screen now)
* 0, 0 at the end means an x, y offset after alignment*/
lv_obj_align(label1, NULL, LV_ALIGN_CENTER, 0, 0);
#else
/* Otherwise we show the selected demo */
#if defined CONFIG_LV_USE_DEMO_WIDGETS
lv_demo_widgets();
#elif defined CONFIG_LV_USE_DEMO_KEYPAD_AND_ENCODER
lv_demo_keypad_encoder();
#elif defined CONFIG_LV_USE_DEMO_BENCHMARK
lv_demo_benchmark();
#elif defined CONFIG_LV_USE_DEMO_STRESS
lv_demo_stress();
#else
#error "No demo application selected."
#endif
#endif
}
static void lv_tick_task(void *arg) {
(void) arg;
lv_tick_inc(LV_TICK_PERIOD_MS);
}
Screenshot and/or video
N/A