Remove ticker (use millis() instead), faster screen update, remove delay from debug print (use .flush())

Author: Pablo2048

examples/ESP32_TFT_eSPI/ESP32_TFT_eSPI.ino

@@ -1,10 +1,6 @@
 #include <lvgl.h>
-#include <Ticker.h>
 #include <TFT_eSPI.h>
 
-#define LVGL_TICK_PERIOD 20
-
-Ticker tick; /* timer for interrupt handler */
 TFT_eSPI tft = TFT_eSPI(); /* TFT instance */
 static lv_disp_buf_t disp_buf;
 static lv_color_t buf[LV_HOR_RES_MAX * 10];
@@ -14,95 +10,82 @@ static lv_color_t buf[LV_HOR_RES_MAX * 10];
 void my_print(lv_log_level_t level, const char * file, uint32_t line, const char * dsc)
 {
 
-  Serial.printf("%s@%d->%s\r\n", file, line, dsc);
-  delay(100);
+    Serial.printf("%s@%d->%s\r\n", file, line, dsc);
+    Serial.flush();
 }
 #endif
 
 /* Display flushing */
 void my_disp_flush(lv_disp_drv_t *disp, const lv_area_t *area, lv_color_t *color_p)
 {
-  uint16_t c;
-
-  tft.startWrite(); /* Start new TFT transaction */
-  tft.setAddrWindow(area->x1, area->y1, (area->x2 - area->x1 + 1), (area->y2 - area->y1 + 1)); /* set the working window */
-  for (int y = area->y1; y <= area->y2; y++) {
-    for (int x = area->x1; x <= area->x2; x++) {
-      c = color_p->full;
-      tft.writeColor(c, 1);
-      color_p++;
-    }
-  }
-  tft.endWrite(); /* terminate TFT transaction */
-  lv_disp_flush_ready(disp); /* tell lvgl that flushing is done */
-}
+    uint32_t w = (area->x2 - area->x1 + 1);
+    uint32_t h = (area->y2 - area->y1 + 1);
 
-/* Interrupt driven periodic handler */
-static void lv_tick_handler(void)
-{
+    tft.startWrite();
+    tft.setAddrWindow(area->x1, area->y1, w, h);
+    tft.pushColors(&color_p->full, w * h, true);
+    tft.endWrite();
 
-  lv_tick_inc(LVGL_TICK_PERIOD);
+    lv_disp_flush_ready(disp);
 }
 
 /* Reading input device (simulated encoder here) */
 bool read_encoder(lv_indev_drv_t * indev, lv_indev_data_t * data)
 {
-  static int32_t last_diff = 0;
-  int32_t diff = 0; /* Dummy - no movement */
-  int btn_state = LV_INDEV_STATE_REL; /* Dummy - no press */
+    static int32_t last_diff = 0;
+    int32_t diff = 0; /* Dummy - no movement */
+    int btn_state = LV_INDEV_STATE_REL; /* Dummy - no press */
 
-  data->enc_diff = diff - last_diff;;
-  data->state = btn_state;
+    data->enc_diff = diff - last_diff;;
+    data->state = btn_state;
 
-  last_diff = diff;
+    last_diff = diff;
 
-  return false;
+    return false;
 }
 
-void setup() {
+void setup()
+{
 
-  Serial.begin(115200); /* prepare for possible serial debug */
+    Serial.begin(115200); /* prepare for possible serial debug */
 
-  lv_init();
+    lv_init();
 
 #if USE_LV_LOG != 0
-  lv_log_register_print_cb(my_print); /* register print function for debugging */
+    lv_log_register_print_cb(my_print); /* register print function for debugging */
 #endif
 
-  tft.begin(); /* TFT init */
-  tft.setRotation(1); /* Landscape orientation */
-
-  lv_disp_buf_init(&disp_buf, buf, NULL, LV_HOR_RES_MAX * 10);
-
-  /*Initialize the display*/
-  lv_disp_drv_t disp_drv;
-  lv_disp_drv_init(&disp_drv);
-  disp_drv.hor_res = 320;
-  disp_drv.ver_res = 240;
-  disp_drv.flush_cb = my_disp_flush;
-  disp_drv.buffer = &disp_buf;
-  lv_disp_drv_register(&disp_drv);
-
-
-  /*Initialize the input device driver*/
-  lv_indev_drv_t indev_drv;
-  lv_indev_drv_init(&indev_drv);
-  indev_drv.type = LV_INDEV_TYPE_ENCODER;
-  indev_drv.read_cb = read_encoder;
-  lv_indev_drv_register(&indev_drv);
-
-  /*Initialize the graphics library's tick*/
-  tick.attach_ms(LVGL_TICK_PERIOD, lv_tick_handler);
-
-  /* Create simple label */
-  lv_obj_t *label = lv_label_create(lv_scr_act(), NULL);
-  lv_label_set_text(label, "Hello Arduino! (V6.1)");
-  lv_obj_align(label, NULL, LV_ALIGN_CENTER, 0, 0);
+    tft.begin(); /* TFT init */
+    tft.setRotation(1); /* Landscape orientation */
+
+    lv_disp_buf_init(&disp_buf, buf, NULL, LV_HOR_RES_MAX * 10);
+
+    /*Initialize the display*/
+    lv_disp_drv_t disp_drv;
+    lv_disp_drv_init(&disp_drv);
+    disp_drv.hor_res = 320;
+    disp_drv.ver_res = 240;
+    disp_drv.flush_cb = my_disp_flush;
+    disp_drv.buffer = &disp_buf;
+    lv_disp_drv_register(&disp_drv);
+
+    /*Initialize the (dummy) input device driver*/
+    lv_indev_drv_t indev_drv;
+    lv_indev_drv_init(&indev_drv);
+    indev_drv.type = LV_INDEV_TYPE_ENCODER;
+    indev_drv.read_cb = read_encoder;
+    lv_indev_drv_register(&indev_drv);
+
+    /* Create simple label */
+    lv_obj_t *label = lv_label_create(lv_scr_act(), NULL);
+    lv_label_set_text(label, "Hello Arduino! (V6.1.1)");
+    lv_obj_align(label, NULL, LV_ALIGN_CENTER, 0, 0);
 }
 
 
-void loop() {
+void loop()
+{
 
-  lv_task_handler(); /* let the GUI do its work */
-  delay(5);
+    lv_task_handler(); /* let the GUI do its work */
+    delay(5);
 }

lv_conf.h

@@ -210,9 +210,9 @@ typedef void * lv_img_decoder_user_data_t;
 
 /* 1: use a custom tick source.
  * It removes the need to manually update the tick with `lv_tick_inc`) */
-#define LV_TICK_CUSTOM     0
+#define LV_TICK_CUSTOM     1
 #if LV_TICK_CUSTOM == 1
-#define LV_TICK_CUSTOM_INCLUDE  "something.h"       /*Header for the sys time function*/
+#define LV_TICK_CUSTOM_INCLUDE  "Arduino.h"         /*Header for the sys time function*/
 #define LV_TICK_CUSTOM_SYS_TIME_EXPR (millis())     /*Expression evaluating to current systime in ms*/
 #endif   /*LV_TICK_CUSTOM*/