====== IclcdWrite() ======

''IclcdWrite()'' outputs a character code or custom character.

{{:en-us_commands:reference:iclcdwrite.svg?900|IclcdWrite command operation flow}}

''bool IclcdWrite(uint8_t value, uint8_t device = 0)''

===== Commands =====

^ Command ^ Arguments ^ Return Value ^ Operation ^
| ''IclcdWrite(value, device)'' | ''uint8_t value''\\ ''uint8_t device = 0'' | ''bool'' | Outputs a character code or custom character. |


===== Example =====

This example connects a 20×4 PCF8574 character LCD at address ''0x27'' to the MPAINO-8A8R(T) I2C port. Change the ''IclcdBegin()'' arguments if your LCD has a different address or size.

<code cpp>
bool lcdReady = false;

void setup() {
  lcdReady = IclcdBegin(0x27, 20, 4);  // Set the LCD address and display size.
  if (lcdReady) IclcdWrite('A');  // Write one character to the LCD.
}

void loop() {}
</code>

===== Precautions =====

  * 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.

===== Built-in Commands in the Same Category =====

  * [[:en-us_commands:reference:iclcdbegin|IclcdBegin() View detailed description]]
  * [[:en-us_commands:reference:iclcdclear|IclcdClear() View detailed description]]
  * [[:en-us_commands:reference:iclcdhome|IclcdHome() View detailed description]]
  * [[:en-us_commands:reference:iclcdsetcursor|IclcdSetCursor() View detailed description]]
  * [[:en-us_commands:reference:iclcddisplay|IclcdDisplay() View detailed description]]
  * [[:en-us_commands:reference:iclcdcursor|IclcdCursor() View detailed description]]
  * [[:en-us_commands:reference:iclcdblink|IclcdBlink() View detailed description]]
  * [[:en-us_commands:reference:iclcdbacklight|IclcdBacklight() View detailed description]]
  * [[:en-us_commands:reference:iclcdscrollleft|IclcdScrollLeft() View detailed description]]
  * [[:en-us_commands:reference:iclcdscrollright|IclcdScrollRight() View detailed description]]
  * [[:en-us_commands:reference:iclcdtextdirection|IclcdTextDirection() View detailed description]]
  * [[:en-us_commands:reference:iclcdautoscroll|IclcdAutoscroll() View detailed description]]
  * [[:en-us_commands:reference:iclcdcreatechar|IclcdCreateChar() View detailed description]]
  * [[:en-us_commands:reference:iclcdcommand|IclcdCommand() View detailed description]]
  * [[:en-us_commands:reference:iclcdprint|IclcdPrint() View detailed description]]

[[:en-us_commands:builtin|← Built-in Command List]]