snapshot

libraries/GFX_Library_for_Arduino/examples/Clock/AnalogClock/AnalogClock.ino

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+/*******************************************************************************
+   Arduino Watch Lite Version
+   You may find full version at: https://github.com/moononournation/ArduinoWatch
+ ******************************************************************************/
+
+/*******************************************************************************
+ * Start of Arduino_GFX setting
+ *
+ * Arduino_GFX try to find the settings depends on selected board in Arduino IDE
+ * Or you can define the display dev kit not in the board list
+ * Defalult pin list for non display dev kit:
+ * Arduino Nano, Micro and more: CS:  9, DC:  8, RST:  7, BL:  6, SCK: 13, MOSI: 11, MISO: 12
+ * ESP32 various dev board     : CS:  5, DC: 27, RST: 33, BL: 22, SCK: 18, MOSI: 23, MISO: nil
+ * ESP32-C2/3 various dev board: CS:  7, DC:  2, RST:  1, BL:  3, SCK:  4, MOSI:  6, MISO: nil
+ * ESP32-C5 various dev board  : CS: 23, DC: 24, RST: 25, BL: 26, SCK: 10, MOSI:  8, MISO: nil
+ * ESP32-C6 various dev board  : CS: 18, DC: 22, RST: 23, BL: 15, SCK: 21, MOSI: 19, MISO: nil
+ * ESP32-H2 various dev board  : CS:  0, DC: 12, RST:  8, BL: 22, SCK: 10, MOSI: 25, MISO: nil
+ * ESP32-P4 various dev board  : CS: 26, DC: 27, RST: 25, BL: 24, SCK: 36, MOSI: 32, MISO: nil
+ * ESP32-S2 various dev board  : CS: 34, DC: 38, RST: 33, BL: 21, SCK: 36, MOSI: 35, MISO: nil
+ * ESP32-S3 various dev board  : CS: 40, DC: 41, RST: 42, BL: 48, SCK: 36, MOSI: 35, MISO: nil
+ * ESP8266 various dev board   : CS: 15, DC:  4, RST:  2, BL:  5, SCK: 14, MOSI: 13, MISO: 12
+ * Raspberry Pi Pico dev board : CS: 17, DC: 27, RST: 26, BL: 28, SCK: 18, MOSI: 19, MISO: 16
+ * RTL8720 BW16 old patch core : CS: 18, DC: 17, RST:  2, BL: 23, SCK: 19, MOSI: 21, MISO: 20
+ * RTL8720_BW16 Official core  : CS:  9, DC:  8, RST:  6, BL:  3, SCK: 10, MOSI: 12, MISO: 11
+ * RTL8722 dev board           : CS: 18, DC: 17, RST: 22, BL: 23, SCK: 13, MOSI: 11, MISO: 12
+ * RTL8722_mini dev board      : CS: 12, DC: 14, RST: 15, BL: 13, SCK: 11, MOSI:  9, MISO: 10
+ * Seeeduino XIAO dev board    : CS:  3, DC:  2, RST:  1, BL:  0, SCK:  8, MOSI: 10, MISO:  9
+ * Teensy 4.1 dev board        : CS: 39, DC: 41, RST: 40, BL: 22, SCK: 13, MOSI: 11, MISO: 12
+ ******************************************************************************/
+#include <Arduino_GFX_Library.h>
+
+#define GFX_BL DF_GFX_BL // default backlight pin, you may replace DF_GFX_BL to actual backlight pin
+
+/* More dev device declaration: https://github.com/moononournation/Arduino_GFX/wiki/Dev-Device-Declaration */
+#if defined(DISPLAY_DEV_KIT)
+Arduino_GFX *gfx = create_default_Arduino_GFX();
+#else /* !defined(DISPLAY_DEV_KIT) */
+
+/* More data bus class: https://github.com/moononournation/Arduino_GFX/wiki/Data-Bus-Class */
+Arduino_DataBus *bus = create_default_Arduino_DataBus();
+
+/* More display class: https://github.com/moononournation/Arduino_GFX/wiki/Display-Class */
+Arduino_GFX *gfx = new Arduino_ILI9341(bus, DF_GFX_RST, 0 /* rotation */, false /* IPS */);
+
+#endif /* !defined(DISPLAY_DEV_KIT) */
+/*******************************************************************************
+ * End of Arduino_GFX setting
+ ******************************************************************************/
+
+#define BACKGROUND RGB565_BLACK
+#define MARK_COLOR RGB565_WHITE
+#define SUBMARK_COLOR RGB565_DARKGREY // RGB565_LIGHTGREY
+#define HOUR_COLOR RGB565_WHITE
+#define MINUTE_COLOR RGB565_BLUE // RGB565_LIGHTGREY
+#define SECOND_COLOR RGB565_RED
+
+#define SIXTIETH 0.016666667
+#define TWELFTH 0.08333333
+#define SIXTIETH_RADIAN 0.10471976
+#define TWELFTH_RADIAN 0.52359878
+#define RIGHT_ANGLE_RADIAN 1.5707963
+
+static uint8_t conv2d(const char *p)
+{
+  uint8_t v = 0;
+  return (10 * (*p - '0')) + (*++p - '0');
+}
+
+static int16_t w, h, center;
+static int16_t hHandLen, mHandLen, sHandLen, markLen;
+static float sdeg, mdeg, hdeg;
+static int16_t osx = 0, osy = 0, omx = 0, omy = 0, ohx = 0, ohy = 0; // Saved H, M, S x & y coords
+static int16_t nsx, nsy, nmx, nmy, nhx, nhy;                         // H, M, S x & y coords
+static int16_t xMin, yMin, xMax, yMax;                               // redraw range
+static int16_t hh, mm, ss;
+static unsigned long targetTime; // next action time
+
+static int16_t *cached_points;
+static uint16_t cached_points_idx = 0;
+static int16_t *last_cached_point;
+
+void setup(void)
+{
+#ifdef DEV_DEVICE_INIT
+  DEV_DEVICE_INIT();
+#endif
+
+  Serial.begin(115200);
+  // Serial.setDebugOutput(true);
+  // while(!Serial);
+  Serial.println("Arduino_GFX Clock example");
+
+  // Init Display
+  if (!gfx->begin())
+  {
+    Serial.println("gfx->begin() failed!");
+  }
+  gfx->fillScreen(BACKGROUND);
+
+#ifdef GFX_BL
+  pinMode(GFX_BL, OUTPUT);
+  digitalWrite(GFX_BL, HIGH);
+#endif
+
+  // init LCD constant
+  w = gfx->width();
+  h = gfx->height();
+  if (w < h)
+  {
+    center = w / 2;
+  }
+  else
+  {
+    center = h / 2;
+  }
+  hHandLen = center * 3 / 8;
+  mHandLen = center * 2 / 3;
+  sHandLen = center * 5 / 6;
+  markLen = sHandLen / 6;
+  cached_points = (int16_t *)malloc((hHandLen + 1 + mHandLen + 1 + sHandLen + 1) * 2 * 2);
+
+  // Draw 60 clock marks
+  draw_round_clock_mark(
+      // draw_square_clock_mark(
+      center - markLen, center,
+      center - (markLen * 2 / 3), center,
+      center - (markLen / 2), center);
+
+  hh = conv2d(__TIME__);
+  mm = conv2d(__TIME__ + 3);
+  ss = conv2d(__TIME__ + 6);
+
+  targetTime = ((millis() / 1000) + 1) * 1000;
+}
+
+void loop()
+{
+  unsigned long cur_millis = millis();
+  if (cur_millis >= targetTime)
+  {
+    targetTime += 1000;
+    ss++; // Advance second
+    if (ss == 60)
+    {
+      ss = 0;
+      mm++; // Advance minute
+      if (mm > 59)
+      {
+        mm = 0;
+        hh++; // Advance hour
+        if (hh > 23)
+        {
+          hh = 0;
+        }
+      }
+    }
+  }
+
+  // Pre-compute hand degrees, x & y coords for a fast screen update
+  sdeg = SIXTIETH_RADIAN * ((0.001 * (cur_millis % 1000)) + ss); // 0-59 (includes millis)
+  nsx = cos(sdeg - RIGHT_ANGLE_RADIAN) * sHandLen + center;
+  nsy = sin(sdeg - RIGHT_ANGLE_RADIAN) * sHandLen + center;
+  if ((nsx != osx) || (nsy != osy))
+  {
+    mdeg = (SIXTIETH * sdeg) + (SIXTIETH_RADIAN * mm); // 0-59 (includes seconds)
+    hdeg = (TWELFTH * mdeg) + (TWELFTH_RADIAN * hh);   // 0-11 (includes minutes)
+    mdeg -= RIGHT_ANGLE_RADIAN;
+    hdeg -= RIGHT_ANGLE_RADIAN;
+    nmx = cos(mdeg) * mHandLen + center;
+    nmy = sin(mdeg) * mHandLen + center;
+    nhx = cos(hdeg) * hHandLen + center;
+    nhy = sin(hdeg) * hHandLen + center;
+
+    // redraw hands
+    redraw_hands_cached_draw_and_erase();
+
+    ohx = nhx;
+    ohy = nhy;
+    omx = nmx;
+    omy = nmy;
+    osx = nsx;
+    osy = nsy;
+
+    delay(1);
+  }
+}
+
+void draw_round_clock_mark(int16_t innerR1, int16_t outerR1, int16_t innerR2, int16_t outerR2, int16_t innerR3, int16_t outerR3)
+{
+  float x, y;
+  int16_t x0, x1, y0, y1, innerR, outerR;
+  uint16_t c;
+
+  for (uint8_t i = 0; i < 60; i++)
+  {
+    if ((i % 15) == 0)
+    {
+      innerR = innerR1;
+      outerR = outerR1;
+      c = MARK_COLOR;
+    }
+    else if ((i % 5) == 0)
+    {
+      innerR = innerR2;
+      outerR = outerR2;
+      c = MARK_COLOR;
+    }
+    else
+    {
+      innerR = innerR3;
+      outerR = outerR3;
+      c = SUBMARK_COLOR;
+    }
+
+    mdeg = (SIXTIETH_RADIAN * i) - RIGHT_ANGLE_RADIAN;
+    x = cos(mdeg);
+    y = sin(mdeg);
+    x0 = x * outerR + center;
+    y0 = y * outerR + center;
+    x1 = x * innerR + center;
+    y1 = y * innerR + center;
+
+    gfx->drawLine(x0, y0, x1, y1, c);
+  }
+}
+
+void draw_square_clock_mark(int16_t innerR1, int16_t outerR1, int16_t innerR2, int16_t outerR2, int16_t innerR3, int16_t outerR3)
+{
+  float x, y;
+  int16_t x0, x1, y0, y1, innerR, outerR;
+  uint16_t c;
+
+  for (uint8_t i = 0; i < 60; i++)
+  {
+    if ((i % 15) == 0)
+    {
+      innerR = innerR1;
+      outerR = outerR1;
+      c = MARK_COLOR;
+    }
+    else if ((i % 5) == 0)
+    {
+      innerR = innerR2;
+      outerR = outerR2;
+      c = MARK_COLOR;
+    }
+    else
+    {
+      innerR = innerR3;
+      outerR = outerR3;
+      c = SUBMARK_COLOR;
+    }
+
+    if ((i >= 53) || (i < 8))
+    {
+      x = tan(SIXTIETH_RADIAN * i);
+      x0 = center + (x * outerR);
+      y0 = center + (1 - outerR);
+      x1 = center + (x * innerR);
+      y1 = center + (1 - innerR);
+    }
+    else if (i < 23)
+    {
+      y = tan((SIXTIETH_RADIAN * i) - RIGHT_ANGLE_RADIAN);
+      x0 = center + (outerR);
+      y0 = center + (y * outerR);
+      x1 = center + (innerR);
+      y1 = center + (y * innerR);
+    }
+    else if (i < 38)
+    {
+      x = tan(SIXTIETH_RADIAN * i);
+      x0 = center - (x * outerR);
+      y0 = center + (outerR);
+      x1 = center - (x * innerR);
+      y1 = center + (innerR);
+    }
+    else if (i < 53)
+    {
+      y = tan((SIXTIETH_RADIAN * i) - RIGHT_ANGLE_RADIAN);
+      x0 = center + (1 - outerR);
+      y0 = center - (y * outerR);
+      x1 = center + (1 - innerR);
+      y1 = center - (y * innerR);
+    }
+    gfx->drawLine(x0, y0, x1, y1, c);
+  }
+}
+
+void redraw_hands_cached_draw_and_erase()
+{
+  gfx->startWrite();
+  draw_and_erase_cached_line(center, center, nsx, nsy, SECOND_COLOR, cached_points, sHandLen + 1, false, false);
+  draw_and_erase_cached_line(center, center, nhx, nhy, HOUR_COLOR, cached_points + ((sHandLen + 1) * 2), hHandLen + 1, true, false);
+  draw_and_erase_cached_line(center, center, nmx, nmy, MINUTE_COLOR, cached_points + ((sHandLen + 1 + hHandLen + 1) * 2), mHandLen + 1, true, true);
+  gfx->endWrite();
+}
+
+void draw_and_erase_cached_line(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t color, int16_t *cache, int16_t cache_len, bool cross_check_second, bool cross_check_hour)
+{
+#if defined(ESP8266)
+  yield();
+#endif
+  bool steep = _diff(y1, y0) > _diff(x1, x0);
+  if (steep)
+  {
+    _swap_int16_t(x0, y0);
+    _swap_int16_t(x1, y1);
+  }
+
+  int16_t dx, dy;
+  dx = _diff(x1, x0);
+  dy = _diff(y1, y0);
+
+  int16_t err = dx / 2;
+  int8_t xstep = (x0 < x1) ? 1 : -1;
+  int8_t ystep = (y0 < y1) ? 1 : -1;
+  x1 += xstep;
+  int16_t x, y, ox, oy;
+  for (uint16_t i = 0; i <= dx; i++)
+  {
+    if (steep)
+    {
+      x = y0;
+      y = x0;
+    }
+    else
+    {
+      x = x0;
+      y = y0;
+    }
+    ox = *(cache + (i * 2));
+    oy = *(cache + (i * 2) + 1);
+    if ((x == ox) && (y == oy))
+    {
+      if (cross_check_second || cross_check_hour)
+      {
+        write_cache_pixel(x, y, color, cross_check_second, cross_check_hour);
+      }
+    }
+    else
+    {
+      write_cache_pixel(x, y, color, cross_check_second, cross_check_hour);
+      if ((ox > 0) || (oy > 0))
+      {
+        write_cache_pixel(ox, oy, BACKGROUND, cross_check_second, cross_check_hour);
+      }
+      *(cache + (i * 2)) = x;
+      *(cache + (i * 2) + 1) = y;
+    }
+    if (err < dy)
+    {
+      y0 += ystep;
+      err += dx;
+    }
+    err -= dy;
+    x0 += xstep;
+  }
+  for (uint16_t i = dx + 1; i < cache_len; i++)
+  {
+    ox = *(cache + (i * 2));
+    oy = *(cache + (i * 2) + 1);
+    if ((ox > 0) || (oy > 0))
+    {
+      write_cache_pixel(ox, oy, BACKGROUND, cross_check_second, cross_check_hour);
+    }
+    *(cache + (i * 2)) = 0;
+    *(cache + (i * 2) + 1) = 0;
+  }
+}
+
+void write_cache_pixel(int16_t x, int16_t y, int16_t color, bool cross_check_second, bool cross_check_hour)
+{
+  int16_t *cache = cached_points;
+  if (cross_check_second)
+  {
+    for (uint16_t i = 0; i <= sHandLen; i++)
+    {
+      if ((x == *(cache++)) && (y == *(cache)))
+      {
+        return;
+      }
+      cache++;
+    }
+  }
+  if (cross_check_hour)
+  {
+    cache = cached_points + ((sHandLen + 1) * 2);
+    for (uint16_t i = 0; i <= hHandLen; i++)
+    {
+      if ((x == *(cache++)) && (y == *(cache)))
+      {
+        return;
+      }
+      cache++;
+    }
+  }
+  gfx->writePixel(x, y, color);
+}

libraries/GFX_Library_for_Arduino/examples/Clock/AnalogClockNTP/AnalogClockNTP.ino

@@ -0,0 +1,417 @@
+/*******************************************************************************
+   Arduino Analog Clock example (sync time with NTP server)
+ ******************************************************************************/
+
+const char *SSID_NAME = "YourAP";
+const char *SSID_PASSWORD = "PleaseInputYourPasswordHere";
+const long gmtOffset_sec = 8 * 60 * 60; // timezone
+
+/*******************************************************************************
+ * Start of Arduino_GFX setting
+ *
+ * Arduino_GFX try to find the settings depends on selected board in Arduino IDE
+ * Or you can define the display dev kit not in the board list
+ * Defalult pin list for non display dev kit:
+ * Arduino Nano, Micro and more: CS:  9, DC:  8, RST:  7, BL:  6, SCK: 13, MOSI: 11, MISO: 12
+ * ESP32 various dev board     : CS:  5, DC: 27, RST: 33, BL: 22, SCK: 18, MOSI: 23, MISO: nil
+ * ESP32-C2/3 various dev board: CS:  7, DC:  2, RST:  1, BL:  3, SCK:  4, MOSI:  6, MISO: nil
+ * ESP32-C5 various dev board  : CS: 23, DC: 24, RST: 25, BL: 26, SCK: 10, MOSI:  8, MISO: nil
+ * ESP32-C6 various dev board  : CS: 18, DC: 22, RST: 23, BL: 15, SCK: 21, MOSI: 19, MISO: nil
+ * ESP32-H2 various dev board  : CS:  0, DC: 12, RST:  8, BL: 22, SCK: 10, MOSI: 25, MISO: nil
+ * ESP32-P4 various dev board  : CS: 26, DC: 27, RST: 25, BL: 24, SCK: 36, MOSI: 32, MISO: nil
+ * ESP32-S2 various dev board  : CS: 34, DC: 38, RST: 33, BL: 21, SCK: 36, MOSI: 35, MISO: nil
+ * ESP32-S3 various dev board  : CS: 40, DC: 41, RST: 42, BL: 48, SCK: 36, MOSI: 35, MISO: nil
+ * ESP8266 various dev board   : CS: 15, DC:  4, RST:  2, BL:  5, SCK: 14, MOSI: 13, MISO: 12
+ * Raspberry Pi Pico dev board : CS: 17, DC: 27, RST: 26, BL: 28, SCK: 18, MOSI: 19, MISO: 16
+ * RTL8720 BW16 old patch core : CS: 18, DC: 17, RST:  2, BL: 23, SCK: 19, MOSI: 21, MISO: 20
+ * RTL8720_BW16 Official core  : CS:  9, DC:  8, RST:  6, BL:  3, SCK: 10, MOSI: 12, MISO: 11
+ * RTL8722 dev board           : CS: 18, DC: 17, RST: 22, BL: 23, SCK: 13, MOSI: 11, MISO: 12
+ * RTL8722_mini dev board      : CS: 12, DC: 14, RST: 15, BL: 13, SCK: 11, MOSI:  9, MISO: 10
+ * Seeeduino XIAO dev board    : CS:  3, DC:  2, RST:  1, BL:  0, SCK:  8, MOSI: 10, MISO:  9
+ * Teensy 4.1 dev board        : CS: 39, DC: 41, RST: 40, BL: 22, SCK: 13, MOSI: 11, MISO: 12
+ ******************************************************************************/
+#include <Arduino_GFX_Library.h>
+
+#define GFX_BL DF_GFX_BL // default backlight pin, you may replace DF_GFX_BL to actual backlight pin
+
+/* More dev device declaration: https://github.com/moononournation/Arduino_GFX/wiki/Dev-Device-Declaration */
+#if defined(DISPLAY_DEV_KIT)
+Arduino_GFX *gfx = create_default_Arduino_GFX();
+#else /* !defined(DISPLAY_DEV_KIT) */
+
+/* More data bus class: https://github.com/moononournation/Arduino_GFX/wiki/Data-Bus-Class */
+Arduino_DataBus *bus = create_default_Arduino_DataBus();
+
+/* More display class: https://github.com/moononournation/Arduino_GFX/wiki/Display-Class */
+Arduino_GFX *gfx = new Arduino_ILI9341(bus, DF_GFX_RST, 0 /* rotation */, false /* IPS */);
+
+#endif /* !defined(DISPLAY_DEV_KIT) */
+/*******************************************************************************
+ * End of Arduino_GFX setting
+ ******************************************************************************/
+
+#include <WiFi.h>
+
+void setClock()
+{
+  configTime(0, 0, "time1.google.com", "pool.ntp.org");
+
+  Serial.print("Waiting for NTP time sync: ");
+  time_t nowSecs = time(nullptr);
+  while (nowSecs < 8 * 3600 * 2)
+  {
+    delay(500);
+    Serial.print(".");
+    yield();
+    nowSecs = time(nullptr);
+  }
+
+  Serial.println();
+  struct tm timeinfo;
+  gmtime_r(&nowSecs, &timeinfo);
+  Serial.print("Current time: ");
+  char buf[26];
+  Serial.println(asctime_r(&timeinfo, buf));
+}
+
+#define BACKGROUND RGB565_BLACK
+#define MARK_COLOR RGB565_WHITE
+#define SUBMARK_COLOR RGB565_DARKGREY // RGB565_LIGHTGREY
+#define HOUR_COLOR RGB565_WHITE
+#define MINUTE_COLOR RGB565_BLUE // RGB565_LIGHTGREY
+#define SECOND_COLOR RGB565_RED
+
+#define SIXTIETH 0.016666667
+#define TWELFTH 0.08333333
+#define SIXTIETH_RADIAN 0.10471976
+#define TWELFTH_RADIAN 0.52359878
+#define RIGHT_ANGLE_RADIAN 1.5707963
+
+static int16_t w, h, center;
+static int16_t hHandLen, mHandLen, sHandLen, markLen;
+static float sdeg, mdeg, hdeg;
+static int16_t osx = 0, osy = 0, omx = 0, omy = 0, ohx = 0, ohy = 0; // Saved H, M, S x & y coords
+static int16_t nsx, nsy, nmx, nmy, nhx, nhy;                         // H, M, S x & y coords
+static int16_t xMin, yMin, xMax, yMax;                               // redraw range
+static int16_t hh, mm, ss;
+static unsigned long targetTime; // next action time
+
+static int16_t *cached_points;
+static uint16_t cached_points_idx = 0;
+static int16_t *last_cached_point;
+
+void setup(void)
+{
+#ifdef DEV_DEVICE_INIT
+  DEV_DEVICE_INIT();
+#endif
+
+  Serial.begin(115200);
+  // Serial.setDebugOutput(true);
+  // while(!Serial);
+  Serial.println("Arduino_GFX Clock example");
+
+  // Init Display
+  if (!gfx->begin())
+  {
+    Serial.println("gfx->begin() failed!");
+  }
+  gfx->fillScreen(BACKGROUND);
+
+#ifdef GFX_BL
+  pinMode(GFX_BL, OUTPUT);
+  digitalWrite(GFX_BL, HIGH);
+#endif
+
+  // init LCD constant
+  w = gfx->width();
+  h = gfx->height();
+  if (w < h)
+  {
+    center = w / 2;
+  }
+  else
+  {
+    center = h / 2;
+  }
+  hHandLen = center * 3 / 8;
+  mHandLen = center * 2 / 3;
+  sHandLen = center * 5 / 6;
+  markLen = sHandLen / 6;
+  cached_points = (int16_t *)malloc((hHandLen + 1 + mHandLen + 1 + sHandLen + 1) * 2 * 2);
+
+  // Draw 60 clock marks
+  draw_round_clock_mark(
+      // draw_square_clock_mark(
+      center - markLen, center,
+      center - (markLen * 2 / 3), center,
+      center - (markLen / 2), center);
+
+  WiFi.begin(SSID_NAME, SSID_PASSWORD);
+  while (WiFi.status() != WL_CONNECTED)
+  {
+    Serial.print('.');
+    delay(500);
+  }
+
+  setClock();
+
+  targetTime = ((millis() / 1000) + 1) * 1000;
+}
+
+void loop()
+{
+  unsigned long cur_millis = millis();
+  if (cur_millis >= targetTime)
+  {
+    targetTime += 1000;
+    time_t now;
+    time(&now);
+    now += gmtOffset_sec;
+    struct tm *tmLocal = localtime(&now);
+    hh = tmLocal->tm_hour;
+    mm = tmLocal->tm_min;
+    ss = tmLocal->tm_sec;
+  }
+
+  // Pre-compute hand degrees, x & y coords for a fast screen update
+  sdeg = SIXTIETH_RADIAN * ((0.001 * (cur_millis % 1000)) + ss); // 0-59 (includes millis)
+  nsx = cos(sdeg - RIGHT_ANGLE_RADIAN) * sHandLen + center;
+  nsy = sin(sdeg - RIGHT_ANGLE_RADIAN) * sHandLen + center;
+  if ((nsx != osx) || (nsy != osy))
+  {
+    mdeg = (SIXTIETH * sdeg) + (SIXTIETH_RADIAN * mm); // 0-59 (includes seconds)
+    hdeg = (TWELFTH * mdeg) + (TWELFTH_RADIAN * hh);   // 0-11 (includes minutes)
+    mdeg -= RIGHT_ANGLE_RADIAN;
+    hdeg -= RIGHT_ANGLE_RADIAN;
+    nmx = cos(mdeg) * mHandLen + center;
+    nmy = sin(mdeg) * mHandLen + center;
+    nhx = cos(hdeg) * hHandLen + center;
+    nhy = sin(hdeg) * hHandLen + center;
+
+    // redraw hands
+    redraw_hands_cached_draw_and_erase();
+
+    ohx = nhx;
+    ohy = nhy;
+    omx = nmx;
+    omy = nmy;
+    osx = nsx;
+    osy = nsy;
+
+    delay(1);
+  }
+}
+
+void draw_round_clock_mark(int16_t innerR1, int16_t outerR1, int16_t innerR2, int16_t outerR2, int16_t innerR3, int16_t outerR3)
+{
+  float x, y;
+  int16_t x0, x1, y0, y1, innerR, outerR;
+  uint16_t c;
+
+  for (uint8_t i = 0; i < 60; i++)
+  {
+    if ((i % 15) == 0)
+    {
+      innerR = innerR1;
+      outerR = outerR1;
+      c = MARK_COLOR;
+    }
+    else if ((i % 5) == 0)
+    {
+      innerR = innerR2;
+      outerR = outerR2;
+      c = MARK_COLOR;
+    }
+    else
+    {
+      innerR = innerR3;
+      outerR = outerR3;
+      c = SUBMARK_COLOR;
+    }
+
+    mdeg = (SIXTIETH_RADIAN * i) - RIGHT_ANGLE_RADIAN;
+    x = cos(mdeg);
+    y = sin(mdeg);
+    x0 = x * outerR + center;
+    y0 = y * outerR + center;
+    x1 = x * innerR + center;
+    y1 = y * innerR + center;
+
+    gfx->drawLine(x0, y0, x1, y1, c);
+  }
+}
+
+void draw_square_clock_mark(int16_t innerR1, int16_t outerR1, int16_t innerR2, int16_t outerR2, int16_t innerR3, int16_t outerR3)
+{
+  float x, y;
+  int16_t x0, x1, y0, y1, innerR, outerR;
+  uint16_t c;
+
+  for (uint8_t i = 0; i < 60; i++)
+  {
+    if ((i % 15) == 0)
+    {
+      innerR = innerR1;
+      outerR = outerR1;
+      c = MARK_COLOR;
+    }
+    else if ((i % 5) == 0)
+    {
+      innerR = innerR2;
+      outerR = outerR2;
+      c = MARK_COLOR;
+    }
+    else
+    {
+      innerR = innerR3;
+      outerR = outerR3;
+      c = SUBMARK_COLOR;
+    }
+
+    if ((i >= 53) || (i < 8))
+    {
+      x = tan(SIXTIETH_RADIAN * i);
+      x0 = center + (x * outerR);
+      y0 = center + (1 - outerR);
+      x1 = center + (x * innerR);
+      y1 = center + (1 - innerR);
+    }
+    else if (i < 23)
+    {
+      y = tan((SIXTIETH_RADIAN * i) - RIGHT_ANGLE_RADIAN);
+      x0 = center + (outerR);
+      y0 = center + (y * outerR);
+      x1 = center + (innerR);
+      y1 = center + (y * innerR);
+    }
+    else if (i < 38)
+    {
+      x = tan(SIXTIETH_RADIAN * i);
+      x0 = center - (x * outerR);
+      y0 = center + (outerR);
+      x1 = center - (x * innerR);
+      y1 = center + (innerR);
+    }
+    else if (i < 53)
+    {
+      y = tan((SIXTIETH_RADIAN * i) - RIGHT_ANGLE_RADIAN);
+      x0 = center + (1 - outerR);
+      y0 = center - (y * outerR);
+      x1 = center + (1 - innerR);
+      y1 = center - (y * innerR);
+    }
+    gfx->drawLine(x0, y0, x1, y1, c);
+  }
+}
+
+void redraw_hands_cached_draw_and_erase()
+{
+  gfx->startWrite();
+  draw_and_erase_cached_line(center, center, nsx, nsy, SECOND_COLOR, cached_points, sHandLen + 1, false, false);
+  draw_and_erase_cached_line(center, center, nhx, nhy, HOUR_COLOR, cached_points + ((sHandLen + 1) * 2), hHandLen + 1, true, false);
+  draw_and_erase_cached_line(center, center, nmx, nmy, MINUTE_COLOR, cached_points + ((sHandLen + 1 + hHandLen + 1) * 2), mHandLen + 1, true, true);
+  gfx->endWrite();
+}
+
+void draw_and_erase_cached_line(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t color, int16_t *cache, int16_t cache_len, bool cross_check_second, bool cross_check_hour)
+{
+#if defined(ESP8266)
+  yield();
+#endif
+  bool steep = _diff(y1, y0) > _diff(x1, x0);
+  if (steep)
+  {
+    _swap_int16_t(x0, y0);
+    _swap_int16_t(x1, y1);
+  }
+
+  int16_t dx, dy;
+  dx = _diff(x1, x0);
+  dy = _diff(y1, y0);
+
+  int16_t err = dx / 2;
+  int8_t xstep = (x0 < x1) ? 1 : -1;
+  int8_t ystep = (y0 < y1) ? 1 : -1;
+  x1 += xstep;
+  int16_t x, y, ox, oy;
+  for (uint16_t i = 0; i <= dx; i++)
+  {
+    if (steep)
+    {
+      x = y0;
+      y = x0;
+    }
+    else
+    {
+      x = x0;
+      y = y0;
+    }
+    ox = *(cache + (i * 2));
+    oy = *(cache + (i * 2) + 1);
+    if ((x == ox) && (y == oy))
+    {
+      if (cross_check_second || cross_check_hour)
+      {
+        write_cache_pixel(x, y, color, cross_check_second, cross_check_hour);
+      }
+    }
+    else
+    {
+      write_cache_pixel(x, y, color, cross_check_second, cross_check_hour);
+      if ((ox > 0) || (oy > 0))
+      {
+        write_cache_pixel(ox, oy, BACKGROUND, cross_check_second, cross_check_hour);
+      }
+      *(cache + (i * 2)) = x;
+      *(cache + (i * 2) + 1) = y;
+    }
+    if (err < dy)
+    {
+      y0 += ystep;
+      err += dx;
+    }
+    err -= dy;
+    x0 += xstep;
+  }
+  for (uint16_t i = dx + 1; i < cache_len; i++)
+  {
+    ox = *(cache + (i * 2));
+    oy = *(cache + (i * 2) + 1);
+    if ((ox > 0) || (oy > 0))
+    {
+      write_cache_pixel(ox, oy, BACKGROUND, cross_check_second, cross_check_hour);
+    }
+    *(cache + (i * 2)) = 0;
+    *(cache + (i * 2) + 1) = 0;
+  }
+}
+
+void write_cache_pixel(int16_t x, int16_t y, int16_t color, bool cross_check_second, bool cross_check_hour)
+{
+  int16_t *cache = cached_points;
+  if (cross_check_second)
+  {
+    for (uint16_t i = 0; i <= sHandLen; i++)
+    {
+      if ((x == *(cache++)) && (y == *(cache)))
+      {
+        return;
+      }
+      cache++;
+    }
+  }
+  if (cross_check_hour)
+  {
+    cache = cached_points + ((sHandLen + 1) * 2);
+    for (uint16_t i = 0; i <= hHandLen; i++)
+    {
+      if ((x == *(cache++)) && (y == *(cache)))
+      {
+        return;
+      }
+      cache++;
+    }
+  }
+  gfx->writePixel(x, y, color);
+}

libraries/GFX_Library_for_Arduino/examples/Clock/DigitalClock/DigitalClock.ino

@@ -0,0 +1,135 @@
+/*******************************************************************************
+   Arduino Digital Clock simple example
+ ******************************************************************************/
+
+/*******************************************************************************
+ * Start of Arduino_GFX setting
+ *
+ * Arduino_GFX try to find the settings depends on selected board in Arduino IDE
+ * Or you can define the display dev kit not in the board list
+ * Defalult pin list for non display dev kit:
+ * Arduino Nano, Micro and more: CS:  9, DC:  8, RST:  7, BL:  6, SCK: 13, MOSI: 11, MISO: 12
+ * ESP32 various dev board     : CS:  5, DC: 27, RST: 33, BL: 22, SCK: 18, MOSI: 23, MISO: nil
+ * ESP32-C2/3 various dev board: CS:  7, DC:  2, RST:  1, BL:  3, SCK:  4, MOSI:  6, MISO: nil
+ * ESP32-C5 various dev board  : CS: 23, DC: 24, RST: 25, BL: 26, SCK: 10, MOSI:  8, MISO: nil
+ * ESP32-C6 various dev board  : CS: 18, DC: 22, RST: 23, BL: 15, SCK: 21, MOSI: 19, MISO: nil
+ * ESP32-H2 various dev board  : CS:  0, DC: 12, RST:  8, BL: 22, SCK: 10, MOSI: 25, MISO: nil
+ * ESP32-P4 various dev board  : CS: 26, DC: 27, RST: 25, BL: 24, SCK: 36, MOSI: 32, MISO: nil
+ * ESP32-S2 various dev board  : CS: 34, DC: 38, RST: 33, BL: 21, SCK: 36, MOSI: 35, MISO: nil
+ * ESP32-S3 various dev board  : CS: 40, DC: 41, RST: 42, BL: 48, SCK: 36, MOSI: 35, MISO: nil
+ * ESP8266 various dev board   : CS: 15, DC:  4, RST:  2, BL:  5, SCK: 14, MOSI: 13, MISO: 12
+ * Raspberry Pi Pico dev board : CS: 17, DC: 27, RST: 26, BL: 28, SCK: 18, MOSI: 19, MISO: 16
+ * RTL8720 BW16 old patch core : CS: 18, DC: 17, RST:  2, BL: 23, SCK: 19, MOSI: 21, MISO: 20
+ * RTL8720_BW16 Official core  : CS:  9, DC:  8, RST:  6, BL:  3, SCK: 10, MOSI: 12, MISO: 11
+ * RTL8722 dev board           : CS: 18, DC: 17, RST: 22, BL: 23, SCK: 13, MOSI: 11, MISO: 12
+ * RTL8722_mini dev board      : CS: 12, DC: 14, RST: 15, BL: 13, SCK: 11, MOSI:  9, MISO: 10
+ * Seeeduino XIAO dev board    : CS:  3, DC:  2, RST:  1, BL:  0, SCK:  8, MOSI: 10, MISO:  9
+ * Teensy 4.1 dev board        : CS: 39, DC: 41, RST: 40, BL: 22, SCK: 13, MOSI: 11, MISO: 12
+ ******************************************************************************/
+#include <Arduino_GFX_Library.h>
+
+#define GFX_BL DF_GFX_BL // default backlight pin, you may replace DF_GFX_BL to actual backlight pin
+
+/* More dev device declaration: https://github.com/moononournation/Arduino_GFX/wiki/Dev-Device-Declaration */
+#if defined(DISPLAY_DEV_KIT)
+Arduino_GFX *gfx = create_default_Arduino_GFX();
+#else /* !defined(DISPLAY_DEV_KIT) */
+
+/* More data bus class: https://github.com/moononournation/Arduino_GFX/wiki/Data-Bus-Class */
+Arduino_DataBus *bus = create_default_Arduino_DataBus();
+
+/* More display class: https://github.com/moononournation/Arduino_GFX/wiki/Display-Class */
+Arduino_GFX *gfx = new Arduino_ILI9341(bus, DF_GFX_RST, 0 /* rotation */, false /* IPS */);
+
+#endif /* !defined(DISPLAY_DEV_KIT) */
+/*******************************************************************************
+ * End of Arduino_GFX setting
+ ******************************************************************************/
+
+static uint8_t conv2d(const char *p)
+{
+  uint8_t v = 0;
+  return (10 * (*p - '0')) + (*++p - '0');
+}
+
+static int16_t hh, mm, ss;
+static unsigned long targetTime; // next action time
+
+void setup(void)
+{
+#ifdef DEV_DEVICE_INIT
+  DEV_DEVICE_INIT();
+#endif
+
+  Serial.begin(115200);
+  // Serial.setDebugOutput(true);
+  // while(!Serial);
+  Serial.println("Arduino_GFX Clock example");
+
+  // Init Display
+  if (!gfx->begin())
+  {
+    Serial.println("gfx->begin() failed!");
+  }
+  gfx->fillScreen(RGB565_BLACK);
+
+#ifdef GFX_BL
+  pinMode(GFX_BL, OUTPUT);
+  digitalWrite(GFX_BL, HIGH);
+#endif
+
+  // init LCD constant
+  hh = conv2d(__TIME__);
+  mm = conv2d(__TIME__ + 3);
+  ss = conv2d(__TIME__ + 6);
+
+  targetTime = ((millis() / 1000) + 1) * 1000;
+
+  int textSize = gfx->width() / 8 / 6;
+
+  gfx->setTextColor(RGB565_WHITE, RGB565_BLACK);
+  gfx->setTextSize(textSize, textSize, 2 /* pixel_margin */);
+}
+
+void loop()
+{
+  unsigned long cur_millis = millis();
+  if (cur_millis >= targetTime)
+  {
+    targetTime += 1000;
+    ss++; // Advance second
+    if (ss == 60)
+    {
+      ss = 0;
+      mm++; // Advance minute
+      if (mm > 59)
+      {
+        mm = 0;
+        hh++; // Advance hour
+        if (hh > 23)
+        {
+          hh = 0;
+        }
+      }
+    }
+
+    // draw time
+    gfx->setCursor(0, 0);
+    if (hh < 10) {
+      gfx->print('0');
+    }
+    gfx->print(hh);
+    gfx->print(':');
+    if (mm < 10) {
+      gfx->print('0');
+    }
+    gfx->print(mm);
+    gfx->print(':');
+    if (ss < 10) {
+      gfx->print('0');
+    }
+    gfx->print(ss);
+  }
+
+  delay(1);
+}

libraries/GFX_Library_for_Arduino/examples/Clock/DigitalClockNTP/DigitalClockNTP.ino

@@ -0,0 +1,137 @@
+/*******************************************************************************
+   Arduino Digital Clock example (sync time with NTP server)
+ ******************************************************************************/
+
+const char *SSID_NAME = "YourAP";
+const char *SSID_PASSWORD = "PleaseInputYourPasswordHere";
+const long gmtOffset_sec = 8 * 60 * 60; // timezone
+
+/*******************************************************************************
+ * Start of Arduino_GFX setting
+ *
+ * Arduino_GFX try to find the settings depends on selected board in Arduino IDE
+ * Or you can define the display dev kit not in the board list
+ * Defalult pin list for non display dev kit:
+ * Arduino Nano, Micro and more: CS:  9, DC:  8, RST:  7, BL:  6, SCK: 13, MOSI: 11, MISO: 12
+ * ESP32 various dev board     : CS:  5, DC: 27, RST: 33, BL: 22, SCK: 18, MOSI: 23, MISO: nil
+ * ESP32-C2/3 various dev board: CS:  7, DC:  2, RST:  1, BL:  3, SCK:  4, MOSI:  6, MISO: nil
+ * ESP32-C5 various dev board  : CS: 23, DC: 24, RST: 25, BL: 26, SCK: 10, MOSI:  8, MISO: nil
+ * ESP32-C6 various dev board  : CS: 18, DC: 22, RST: 23, BL: 15, SCK: 21, MOSI: 19, MISO: nil
+ * ESP32-H2 various dev board  : CS:  0, DC: 12, RST:  8, BL: 22, SCK: 10, MOSI: 25, MISO: nil
+ * ESP32-P4 various dev board  : CS: 26, DC: 27, RST: 25, BL: 24, SCK: 36, MOSI: 32, MISO: nil
+ * ESP32-S2 various dev board  : CS: 34, DC: 38, RST: 33, BL: 21, SCK: 36, MOSI: 35, MISO: nil
+ * ESP32-S3 various dev board  : CS: 40, DC: 41, RST: 42, BL: 48, SCK: 36, MOSI: 35, MISO: nil
+ * ESP8266 various dev board   : CS: 15, DC:  4, RST:  2, BL:  5, SCK: 14, MOSI: 13, MISO: 12
+ * Raspberry Pi Pico dev board : CS: 17, DC: 27, RST: 26, BL: 28, SCK: 18, MOSI: 19, MISO: 16
+ * RTL8720 BW16 old patch core : CS: 18, DC: 17, RST:  2, BL: 23, SCK: 19, MOSI: 21, MISO: 20
+ * RTL8720_BW16 Official core  : CS:  9, DC:  8, RST:  6, BL:  3, SCK: 10, MOSI: 12, MISO: 11
+ * RTL8722 dev board           : CS: 18, DC: 17, RST: 22, BL: 23, SCK: 13, MOSI: 11, MISO: 12
+ * RTL8722_mini dev board      : CS: 12, DC: 14, RST: 15, BL: 13, SCK: 11, MOSI:  9, MISO: 10
+ * Seeeduino XIAO dev board    : CS:  3, DC:  2, RST:  1, BL:  0, SCK:  8, MOSI: 10, MISO:  9
+ * Teensy 4.1 dev board        : CS: 39, DC: 41, RST: 40, BL: 22, SCK: 13, MOSI: 11, MISO: 12
+ ******************************************************************************/
+#include <Arduino_GFX_Library.h>
+
+#define GFX_BL DF_GFX_BL // default backlight pin, you may replace DF_GFX_BL to actual backlight pin
+
+/* More dev device declaration: https://github.com/moononournation/Arduino_GFX/wiki/Dev-Device-Declaration */
+#if defined(DISPLAY_DEV_KIT)
+Arduino_GFX *gfx = create_default_Arduino_GFX();
+#else /* !defined(DISPLAY_DEV_KIT) */
+
+/* More data bus class: https://github.com/moononournation/Arduino_GFX/wiki/Data-Bus-Class */
+Arduino_DataBus *bus = create_default_Arduino_DataBus();
+
+/* More display class: https://github.com/moononournation/Arduino_GFX/wiki/Display-Class */
+Arduino_GFX *gfx = new Arduino_ILI9341(bus, DF_GFX_RST, 0 /* rotation */, false /* IPS */);
+
+#endif /* !defined(DISPLAY_DEV_KIT) */
+/*******************************************************************************
+ * End of Arduino_GFX setting
+ ******************************************************************************/
+
+#include <WiFi.h>
+
+void setClock()
+{
+  configTime(0, 0, "time1.google.com", "pool.ntp.org");
+
+  Serial.print("Waiting for NTP time sync: ");
+  time_t nowSecs = time(nullptr);
+  while (nowSecs < 8 * 3600 * 2)
+  {
+    delay(500);
+    Serial.print(".");
+    yield();
+    nowSecs = time(nullptr);
+  }
+
+  Serial.println();
+  struct tm timeinfo;
+  gmtime_r(&nowSecs, &timeinfo);
+  Serial.print("Current time: ");
+  char buf[26];
+  Serial.println(asctime_r(&timeinfo, buf));
+}
+
+static unsigned long targetTime; // next action time
+
+void setup(void)
+{
+#ifdef DEV_DEVICE_INIT
+  DEV_DEVICE_INIT();
+#endif
+
+  Serial.begin(115200);
+  // Serial.setDebugOutput(true);
+  // while(!Serial);
+  Serial.println("Arduino_GFX Clock example");
+
+  // Init Display
+  if (!gfx->begin())
+  {
+    Serial.println("gfx->begin() failed!");
+  }
+  gfx->fillScreen(RGB565_BLACK);
+
+#ifdef GFX_BL
+  pinMode(GFX_BL, OUTPUT);
+  digitalWrite(GFX_BL, HIGH);
+#endif
+
+  WiFi.begin(SSID_NAME, SSID_PASSWORD);
+  while (WiFi.status() != WL_CONNECTED)
+  {
+    Serial.print('.');
+    delay(500);
+  }
+
+  setClock();
+
+  targetTime = ((millis() / 1000) + 1) * 1000;
+
+  int textSize = gfx->width() / 8 / 6;
+
+  gfx->setTextColor(RGB565_WHITE, RGB565_BLACK);
+  gfx->setTextSize(textSize, textSize, 2 /* pixel_margin */);
+}
+
+void loop()
+{
+  unsigned long cur_millis = millis();
+  if (cur_millis >= targetTime)
+  {
+    targetTime += 1000;
+
+    char timeStr[9];
+    time_t now;
+    time(&now);
+    now += gmtOffset_sec;
+    struct tm *tmLocal = localtime(&now);
+    strftime(timeStr, sizeof(timeStr), "%H:%M:%S", tmLocal);
+    gfx->setCursor(0, 0);
+    gfx->print(timeStr);
+  }
+
+  delay(1);
+}