TechOverflow Logo
TechOverflow

PlatformIO 的 ST7735R 最小 LVGL 图表示例

English Deutsch 简体中文

**重要：**在较新版本的 PlatformIO 中，大多数 ESP32 板在此示例中会崩溃，除非你创建自定义 lv_conf.h 配置文件指定使用内部内存而不是 PSRAM。查看如何修复 lv_tlsf_create() / lv_mem_init() 中的 ESP32 LVGL 崩溃/重启了解修复说明。

此示例基于我们之前的文章 PlatformIO 的 Adafruit ST7735R 显示器最小 LVGL 示例

查看 使用 Adafruit ST7735 的最小 ESP32 PlatformIO TFT 显示示例 了解推荐的硬件配置。

注意此示例可以轻松修改以与其他 LCD 控制器或显示器一起工作。

ST7735R TFT 显示器显示带红色和绿色数据系列及温度标签的 LVGL 图表

st7735r_lvgl_chart_example.cpp
#include <Arduino.h>
#include <Adafruit_GFX.h>
#include <Adafruit_ST7735.h>
#include <Adafruit_LvGL_Glue.h>
#include <lvgl.h>
#include <string>

constexpr int Pin_LCD_CS = 27;
constexpr int Pin_LCD_DC = 23;
constexpr int Pin_LCD_RST = 22;
constexpr int Pin_LCD_SCLK = 14;
constexpr int Pin_LCD_MISO = 12;
constexpr int Pin_LCD_MOSI = 13;

Adafruit_ST7735 lcd(Pin_LCD_CS, Pin_LCD_DC, Pin_LCD_MOSI, Pin_LCD_SCLK,
                                 Pin_LCD_RST);
Adafruit_LvGL_Glue glue;

void lvgl_chart_setup() {
    /*Create a chart*/
    lv_obj_t * chart;
    chart = lv_chart_create(lv_scr_act());
    lv_obj_set_size(chart, 160, 100);
    lv_obj_align(chart, LV_ALIGN_BOTTOM_MID, 0, -3);
    lv_chart_set_type(chart, LV_CHART_TYPE_LINE);   /*Show lines and points too*/

    /*Add two data series*/
    lv_chart_series_t * ser1 = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_RED), LV_CHART_AXIS_PRIMARY_Y);
    lv_chart_series_t * ser2 = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_GREEN), LV_CHART_AXIS_SECONDARY_Y);

    /*Set the next points on 'ser1'*/
    lv_chart_set_next_value(chart, ser1, 10);
    lv_chart_set_next_value(chart, ser1, 10);
    lv_chart_set_next_value(chart, ser1, 10);
    lv_chart_set_next_value(chart, ser1, 10);
    lv_chart_set_next_value(chart, ser1, 10);
    lv_chart_set_next_value(chart, ser1, 10);
    lv_chart_set_next_value(chart, ser1, 10);
    lv_chart_set_next_value(chart, ser1, 30);
    lv_chart_set_next_value(chart, ser1, 70);
    lv_chart_set_next_value(chart, ser1, 90);

    /*Directly set points on 'ser2'*/
    ser2->y_points[0] = 90;
    ser2->y_points[1] = 70;
    ser2->y_points[2] = 65;
    ser2->y_points[3] = 65;
    ser2->y_points[4] = 65;
    ser2->y_points[5] = 65;
    ser2->y_points[6] = 65;
    ser2->y_points[7] = 65;
    ser2->y_points[8] = 65;
    ser2->y_points[9] = 65;

    lv_chart_refresh(chart); /*Required after direct set*/
}

void lvgl_setup(void) {
  // Create simple label centered on screen
  lv_obj_t *label = lv_label_create(lv_scr_act());
  lv_label_set_text(label, "Temperature");
  lv_obj_align(label, LV_ALIGN_TOP_MID, 0, 2);

  lvgl_chart_setup();
}

void setup() {
  lcd.initR(INITR_BLACKTAB);      // Init ST7735S chip, black tab
  lcd.setRotation(1);

  LvGLStatus status = glue.begin(&lcd);
  if(status != LVGL_OK) {
    Serial.printf("Glue error %d\r\n", (int)status);
    ESP.restart();
  }

  lvgl_setup(); // Call UI-building function above
}

void loop() {
  lv_task_handler(); // Call LittleVGL task handler periodically
  delay(5);
}
platformio.ini
[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
lib_deps =
  adafruit/Adafruit GFX Library@^1.11.5
  adafruit/Adafruit ST7735 and ST7789 Library@^1.10.0
  adafruit/Adafruit LittlevGL Glue Library@^2.1.4
  adafruit/SdFat - Adafruit Fork@^2.2.1
  lvgl/lvgl@^8.3.7
Check out similar posts by category: Arduino, LVGL, PlatformIO