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#include <lvgl.h>
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#include <TFT_eSPI.h>
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TFT_eSPI tft = TFT_eSPI(); /* TFT instance */
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static lv_disp_buf_t disp_buf;
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static lv_color_t buf[LV_HOR_RES_MAX * 10];
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#if USE_LV_LOG != 0
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/* Serial debugging */
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void my_print(lv_log_level_t level, const char * file, uint32_t line, const char * dsc)
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{
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Serial.printf("%s@%d->%s\r\n", file, line, dsc);
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Serial.flush();
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}
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#endif
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/* Display flushing */
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void my_disp_flush(lv_disp_drv_t *disp, const lv_area_t *area, lv_color_t *color_p)
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{
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uint32_t w = (area->x2 - area->x1 + 1);
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uint32_t h = (area->y2 - area->y1 + 1);
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tft.startWrite();
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tft.setAddrWindow(area->x1, area->y1, w, h);
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tft.pushColors(&color_p->full, w * h, true);
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tft.endWrite();
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lv_disp_flush_ready(disp);
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}
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/*Read the touchpad*/
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bool my_touchpad_read(lv_indev_drv_t * indev_driver, lv_indev_data_t * data)
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{
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uint16_t touchX, touchY;
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bool touched = tft.getTouch(&touchX, &touchY, 600);
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if(!touched)
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{
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data->state = LV_INDEV_STATE_REL;
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return false;
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}
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else
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{
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data->state = LV_INDEV_STATE_PR;
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}
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if(touchX>screenWidth || touchY > screenHeight)
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{
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Serial.println("Y or y outside of expected parameters..");
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Serial.print("y:");
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Serial.print(touchX);
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Serial.print(" x:");
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Serial.print(touchY);
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}
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else
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{
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/*Set the coordinates*/
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data->point.x = touchX;
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data->point.y = touchY;
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Serial.print("Data x");
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Serial.println(touchX);
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Serial.print("Data y");
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Serial.println(touchY);
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}
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return false; /*Return `false` because we are not buffering and no more data to read*/
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}
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void setup()
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{
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Serial.begin(115200); /* prepare for possible serial debug */
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lv_init();
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#if USE_LV_LOG != 0
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lv_log_register_print_cb(my_print); /* register print function for debugging */
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#endif
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tft.begin(); /* TFT init */
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tft.setRotation(1); /* Landscape orientation */
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uint16_t calData[5] = { 275, 3620, 264, 3532, 1 };
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tft.setTouch(calData);
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lv_disp_buf_init(&disp_buf, buf, NULL, LV_HOR_RES_MAX * 10);
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/*Initialize the display*/
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lv_disp_drv_t disp_drv;
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lv_disp_drv_init(&disp_drv);
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disp_drv.hor_res = 320;
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disp_drv.ver_res = 240;
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disp_drv.flush_cb = my_disp_flush;
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disp_drv.buffer = &disp_buf;
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lv_disp_drv_register(&disp_drv);
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/*Initialize the (dummy) input device driver*/
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lv_indev_drv_t indev_drv;
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lv_indev_drv_init(&indev_drv);
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indev_drv.type = LV_INDEV_TYPE_POINTER;
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indev_drv.read_cb = my_touchpad_read;
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lv_indev_drv_register(&indev_drv);
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/* Try an example from the lv_examples repository
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* https://github.com/lvgl/lv_examples*/
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lv_ex_btn_1();
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}
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void loop()
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{
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lv_task_handler(); /* let the GUI do its work */
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delay(5);
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}
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@ -1,44 +0,0 @@
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# Example for lv_arduino using a slider
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This example has the screen set to 320x480 (ILI9488), change this by altering the following lines in the main ino file:
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```C
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int screenWidth = 480;
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int screenHeight = 320;
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```
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## Backlight
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Change pin 32 to your preferred backlight pin using a PNP transistor (2N3906) or remove the following code and connect directly to +ve:
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```C
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ledcSetup(10, 5000/*freq*/, 10 /*resolution*/);
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ledcAttachPin(32, 10);
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analogReadResolution(10);
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ledcWrite(10,768);
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```
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## Theme selection
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Change the following to change the theme:
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```C
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lv_theme_t * th = lv_theme_night_init(210, NULL); //Set a HUE value and a Font for the Night Theme
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lv_theme_set_current(th);
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```
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## Calibration
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This is using the bodmer tft_espi driver for touch. To correctly set the calibration load the calibration sketch and replace the following with your values:
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```C
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uint16_t calData[5] = { 275, 3620, 264, 3532, 1 };
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```
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## Screen rotation
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Check the following if you need to alter your screen rotation:
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```C
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tft.setRotation(3);
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```
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@ -1,37 +0,0 @@
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# LVGL Arduino examples
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LVGL can be installed via Arduino IDE Library Manager or as an .ZIP library.
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It will install [lv_exmaples](https://github.com/lvgl/lv_examples) which contains a lot of examples and demos to try LVGL.
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## Example
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There are simple examples which use the [TFT_eSPI](https://github.com/Bodmer/TFT_eSPI) library as a TFT driver to simplify testing.
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To get all this to work you have to setup TFT_eSPI to work with your TFT display type via editing the `User_Setup.h` file in TFT_eSPI library folder, or by selecting your own configurtion in the `User_Setup_Select.h` file in TFT_eSPI library folder.
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LVGL library has its own configuration file called `lv_conf.h`. When LVGL is installed to followings needs to be done to configure it:
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1. Go to directory of the installed Arduno libraries
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2. Go to `lvgl` and copy `lv_conf_template.h` as `lv_conf.h` next to the `src` folder.
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3. Open `lv_conf.h` and change the first `#if 0` to `#if 1`
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4. Set the resolution of your display in `LV_HOR_RES_MAX` and `LV_VER_RES_MAX`
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5. Set the color depth of you display in `LV_COLOR_DEPTH`
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6. Set `LV_TICK_CUSTOM 1`
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## Debugging
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In case of trouble there are debug informations inside LVGL. In the `ESP32_TFT_eSPI` example there is `my_print` method, which allow to send this debug informations to the serial interface. To enable this feature you have to edit `lv_conf.h` file and enable logging in section `log settings`:
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```c
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/*Log settings*/
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#define USE_LV_LOG 1 /*Enable/disable the log module*/
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#if LV_USE_LOG
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/* How important log should be added:
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* LV_LOG_LEVEL_TRACE A lot of logs to give detailed information
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* LV_LOG_LEVEL_INFO Log important events
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* LV_LOG_LEVEL_WARN Log if something unwanted happened but didn't cause a problem
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* LV_LOG_LEVEL_ERROR Only critical issue, when the system may fail
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* LV_LOG_LEVEL_NONE Do not log anything
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*/
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# define LV_LOG_LEVEL LV_LOG_LEVEL_WARN
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```
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After enabling log module and setting LV_LOG_LEVEL accordingly the output log is sent to the `Serial` port @ 115200 Bd.
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