72x40の OLEDの画面表示が出るまでに時間が掛かるのを修正する方法 OLED SSD1306 0.42'

【ソースコード有】Arduino RP2040で I2C接続の OLED SSD1306 72x40 0.42をサクッと動かす方法

/* [2] pre-charge period 0x022/f1, 0.42 OLED datasheet: 0x22 */
#define OLED_PRE_CHARGE_PERIOD 0x22

      static const uint8_t PROGMEM display_setup1[] = {
        0x00, // I2C_CMD
        0x0ad, 0x010, /* Internal IREF Setting for the 0.42 OLED, see also issue https://github.com/olikraus/u8g2/issues/1047 */
      };

      if (!oled_send_cmd_P(display_setup1, ARRAY_SIZE(display_setup1))) {
          print("oled_init cmd set 1 failed\n");
          return false;
      }

    static const uint8_t PROGMEM display_setup1[] = {
        I2C_CMD,
        DISPLAY_OFF,
        DISPLAY_CLOCK,
        OLED_DISPLAY_CLOCK,
        MULTIPLEX_RATIO,
#if OLED_IC_COM_PINS_ARE_COLUMNS
        OLED_DISPLAY_WIDTH - 1,
#else
        OLED_DISPLAY_HEIGHT - 1,
#endif
#if OLED_IC == OLED_IC_SH1107
        SH1107_DISPLAY_START_LINE,
        0x00,
#else
        DISPLAY_START_LINE | 0x00,
#endif

        0x0ad, 0x030, /* Internal IREF Setting for the 0.42 OLED, see also issue https://github.com/olikraus/u8g2/issues/1047 */

        CHARGE_PUMP,
        0x14,
#if OLED_IC_HAS_HORIZONTAL_MODE
        // MEMORY_MODE is unsupported on SH1106 (Page Addressing only)
        MEMORY_MODE,
        0x00, // Horizontal addressing mode
#elif OLED_IC == OLED_IC_SH1107
        // Page addressing mode
        SH1107_MEMORY_MODE_PAGE,
#endif
    };

    static const uint8_t PROGMEM display_setup1[] = {
        I2C_CMD,

        DISPLAY_OFF,
        DISPLAY_CLOCK,
        0x80,
        MULTIPLEX_RATIO,
        OLED_DISPLAY_HEIGHT - 1,
        DISPLAY_OFFSET,
        0x00,
        DISPLAY_START_LINE | 0x00,

        0x0ad, 0x030, /* Internal IREF Setting for the 0.42 OLED, see also issue https://github.com/olikraus/u8g2/issues/1047 */

        CHARGE_PUMP,
        0x14,
#if (OLED_IC != OLED_IC_SH1106)
        // MEMORY_MODE is unsupported on SH1106 (Page Addressing only)
        MEMORY_MODE,
        0x00,  // Horizontal addressing mode
#endif
    };

    static const uint8_t PROGMEM display_setup2[] = {I2C_CMD,
        COM_PINS, OLED_COM_PINS,
        CONTRAST, OLED_BRIGHTNESS,
        // PRE_CHARGE_PERIOD, 0xF1,
        PRE_CHARGE_PERIOD, 0x022, /* [2] pre-charge period 0x022/f1, 0.42 OLED datasheet: 0x22 */
        VCOM_DETECT, 0x20,
        DISPLAY_ALL_ON_RESUME,
        NORMAL_DISPLAY,
        DEACTIVATE_SCROLL,
        DISPLAY_ON
    };

U8G2_SSD1306_72X40_ER_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);   // EastRising 0.42" OLED

　OLED
  Wire.setSDA(22);
  Wire.setSCL(23);

　WS2812 RGB LED
#define LED_PIN 12
WS2812FX ws2812fx = WS2812FX(LED_COUNT, LED_PIN, NEO_RGB + NEO_KHZ800);

  uint32_t colors[] = {RED, GREEN}; // create an array of colors
  ws2812fx.setSegment(0, 0, LED_COUNT-1, FX_MODE_FADE, colors, 1000, NO_OPTIONS);