====== IclcdClear() ======

''IclcdClear()'' clears the LCD screen.

{{:en-us_commands:reference:iclcdclear.svg?900|IclcdClear command operation flow}}

''bool IclcdClear(uint8_t device = 0)''

===== Commands =====

^ Command ^ Arguments ^ Return Value ^ Operation ^
| ''IclcdClear(device)'' | ''uint8_t device = 0'' | ''bool'' | Clears the LCD screen. |


===== Example =====

This example uses a PCF8574 character LCD at I²C address ''0x27''. Send ''c'' from Serial Monitor to clear the text on the display.

<code cpp>
bool lcdReady = false;

void setup() {
  Serial.begin(115200);
  lcdReady = IclcdBegin(0x27, 20, 4);  // Initialize the LCD and check the connection.
  if (!lcdReady) {
    Serial.println(F("LCD not found"));
    return;
  }
  IclcdPrint(F("Press c to clear"));  // Show text before clearing the display.
}

void loop() {
  if (!lcdReady || !Serial.available()) return;
  if (Serial.read() != 'c') return;
  if (IclcdClear()) {  // Clear the LCD screen.
    Serial.println(F("LCD cleared"));
  }
}
</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: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:iclcdwrite|IclcdWrite() 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]]