IclcdCreateChar() registers a custom character.

bool IclcdCreateChar(uint8_t location, const uint8_t charmap[8], uint8_t device = 0)

const uint8_t heart[8] = {
  0b00000, 0b01010, 0b11111, 0b11111,
  0b01110, 0b00100, 0b00000, 0b00000
};
 
IclcdCreateChar(0, heart);
IclcdSetCursor(0, 1);
IclcdWrite(0);

• PCF8574 connections use the same mapping as the existing CLCD library: P0=RS, P1=R/W, P2=Enable, P3=backlight, P4~P7=LCD D4~D7.
• Verify the LCD module's actual I²C address using its settings and I²C scan results.
• SDA/SCL can share the bus with other I²C devices, but addresses must not overlap.
• Do not run Wire transfers or I²C slave callbacks concurrently with Iclcd…(). Iclcd transfers run at 100 kHz and then restore the previous TWI settings.
• On MPAINO, using D20/D21 for external interrupts prevents simultaneous I²C use.
• IclcdCommand() can change the LCD state directly. Use it only if you understand HD44780 commands.

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