发现 createChar 后直接 write 不能直接显示

// 自定义字符, 指定哪个像素亮，哪个灭
byte heart[8] = {
    0b00000,
    0b01010,
    0b11111,
    0b11111,
    0b11111,
    0b01110,
    0b00100,
    0b00000};

byte smiley[8] = {
    0b00000,
    0b00000,
    0b01010,
    0b00000,
    0b00000,
    0b10001,
    0b01110,
    0b00000};

byte frownie[8] = {
    0b00000,
    0b00000,
    0b01010,
    0b00000,
    0b00000,
    0b00000,
    0b01110,
    0b10001};

byte armsDown[8] = {
    0b00100,
    0b01010,
    0b00100,
    0b00100,
    0b01110,
    0b10101,
    0b00100,
    0b01010};
byte armsUp[8] = {
    0b00100,
    0b01010,
    0b00100,
    0b10101,
    0b01110,
    0b00100,
    0b00100,
    0b01010};
byte temperturechar[8] = {
    0b10000,
    0b00110,
    0b01001,
    0b01000,
    0b01000,
    0b01001,
    0b00110,
    0b00000,
};

byte *chars[] = {heart, smiley, frownie, armsDown, armsUp, temperturechar};

// 初始化 lcd
void initLcd()
{
    lcd.init(); // initialize the lcd
    lcd.backlight();
    lcd.clear();

    auto len = sizeof(chars) / sizeof(byte *);
    for (size_t idx = 0; idx < len; idx++)
    {
        byte *point = (chars[idx]);
        lcd.createChar(idx, point);
    }
}

// 输出
void testLed()
{
    lcd.home();

    auto len = sizeof(chars) / sizeof(byte *);
    for (size_t idx = 0; idx < len; idx++)
    {
        lcd.write(idx);
    }
}