IclcdDisplay()

IclcdDisplay() turns the LCD display on or off.

bool IclcdDisplay(bool on = true, uint8_t device = 0)

Commands

Command	Arguments	Return Value	Operation
`IclcdDisplay(on, device)`	`bool on = true` `uint8_t device = 0`	`bool`	Turns the LCD display on or off.

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.

bool lcdReady = false;
 
void setup() {
  lcdReady = IclcdBegin(0x27, 20, 4);  // Set the LCD address and display size.
  if (lcdReady) IclcdPrint(F("Ready"));  // Display text to observe the operation.
}
 
void loop() {
  if (!lcdReady) return;
  IclcdDisplay(false);  // Turn the LCD display on or off.
  delay(1000);
  IclcdDisplay(true);  // Turn the LCD display on or off.
  delay(1000);
}

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

← Built-in Command List

ILOGICS Product Documentation

Table of Contents

IclcdDisplay()

Commands

Example

Precautions

Built-in Commands in the Same Category