text: /*
   * SPDX-License-Identifier: Apache-2.0
   */
  
  /**
   * @file Display text strings on HD44780 based 20x4 LCD controller
   * using GPIO for parallel interface on Arduino Due.
   *
   * Datasheet: http://lcd-linux.sourceforge.net/pdfdocs/hd44780.pdf
   *
   * LCD Wiring
   * ----------
   *
   * The wiring for the LCD is as follows:
   * 1 : GND
   * 2 : 5V
   * 3 : Contrast (0-5V)*
   * 4 : RS (Register Select)
   * 5 : R/W (Read Write)       - GROUND THIS PIN
   * 6 : Enable or Strobe
   * 7 : Data Bit 0             - NOT USED
   * 8 : Data Bit 1             - NOT USED
   * 9 : Data Bit 2             - NOT USED
   * 10: Data Bit 3             - NOT USED
   * 11: Data Bit 4
   * 12: Data Bit 5
   * 13: Data Bit 6
   * 14: Data Bit 7
   * 15: LCD Backlight +5V**
   * 16: LCD Backlight GND
   *
   *
   * Arduino Due
   * -----------
   *
   * On Arduino Due:
   * 1. IO_3 is PC28
   * 2. IO_5 is PC25
   * 3. IO_6 is PC24
   * 4. IO_7 is PC23
   * 5. IO_8 is PC22
   * 6. IO_9 is PC21
   *
   * The gpio_atmel_sam3 driver is being used.
   *
   * This sample app display text strings per line & page wise.
   *
   * Every 3 second you should see this repeatedly
   * on display:
   * "
   *     *********************
   *     Arduino Due
   *     20x4 LCD Display
   *     *********************
   *
   *      ------------------
   *     - Zephyr Rocks!
   *     - My super RTOS
   *      ------------------
   *
   *     --------HOME--------
   *     I am home!
   *
   *	--------------------
   */
  
  #include <zephyr.h>
  
  #include <sys/printk.h>
  #include <drivers/gpio.h>
  #include <string.h>
  
  
  #if defined(CONFIG_SOC_PART_NUMBER_SAM3X8E)
  #define GPIO_DRV_NAME DT_LABEL(DT_NODELABEL(pioc))
  #else
  #error "Unsupported GPIO driver"
  #endif
  
  #if defined(CONFIG_SOC_PART_NUMBER_SAM3X8E)
  /* Define GPIO OUT to LCD */
  #define GPIO_PIN_PC12_D0		12	/* PC12 - pin 51 */
  #define GPIO_PIN_PC13_D1		13	/* PC13 - pin 50 */
  #define GPIO_PIN_PC14_D2		14	/* PC14 - pin 49 */
  #define GPIO_PIN_PC15_D3		15	/* PC15 - pin 48 */
  #define GPIO_PIN_PC24_D4		24	/* PC24 - pin 6 */
  #define GPIO_PIN_PC23_D5		23	/* PC23 - pin 7 */
  #define GPIO_PIN_PC22_D6		22	/* PC22 - pin 8 */
  #define GPIO_PIN_PC21_D7		21	/* PC21 - pin 9 */
  #define GPIO_PIN_PC28_RS		28	/* PC28 - pin 3 */
  #define GPIO_PIN_PC25_E			25	/* PC25 - pin 5 */
  #define GPIO_NAME			"GPIO_"
  #endif
  
  /* Commands */
  #define LCD_CLEAR_DISPLAY		0x01
  #define LCD_RETURN_HOME			0x02
  #define LCD_ENTRY_MODE_SET		0x04
  #define LCD_DISPLAY_CONTROL		0x08
  #define LCD_CURSOR_SHIFT		0x10
  #define LCD_FUNCTION_SET		0x20
  #define LCD_SET_CGRAM_ADDR		0x40
  #define LCD_SET_DDRAM_ADDR		0x80
  
  /* Display entry mode */
  #define LCD_ENTRY_RIGHT			0x00
  #define LCD_ENTRY_LEFT			0x02
  #define LCD_ENTRY_SHIFT_INCREMENT	0x01
  #define LCD_ENTRY_SHIFT_DECREMENT	0x00
  
  /* Display on/off control */
  #define LCD_DISPLAY_ON			0x04
  #define LCD_DISPLAY_OFF			0x00
  #define LCD_CURSOR_ON			0x02
  #define LCD_CURSOR_OFF			0x00
  #define LCD_BLINK_ON			0x01
  #define LCD_BLINK_OFF			0x00
  
  /* Display/cursor shift */
  #define LCD_DISPLAY_MOVE		0x08
  #define LCD_CURSOR_MOVE			0x00
  #define LCD_MOVE_RIGHT			0x04
  #define LCD_MOVE_LEFT			0x00
  
  /* Function set */
  #define LCD_8BIT_MODE			0x10
  #define LCD_4BIT_MODE			0x00
  #define LCD_2_LINE			0x08
  #define LCD_1_LINE			0x00
  #define LCD_5x10_DOTS			0x04
  #define LCD_5x8_DOTS			0x00
  
  /* Define some device constants */
  #define LCD_WIDTH			20	/* Max char per line */
  #define HIGH				1
  #define LOW				0
  /* in millisecond */
  #define	ENABLE_DELAY			10
  
  
  #define GPIO_PIN_WR(dev, pin, bit)						\
  	do {									\
  		if (gpio_pin_set_raw((dev), (pin), (bit))) {			\
  			printk("Err set " GPIO_NAME "%d! %x\n", (pin), (bit));	\
  		}								\
  	} while (0)								\
  
  
  #define GPIO_PIN_CFG(dev, pin, dir)						\
  	do {									\
  		if (gpio_pin_configure((dev), (pin), (dir))) {			\
  			printk("Err cfg " GPIO_NAME "%d! %x\n", (pin), (dir));	\
  		}								\
  	} while (0)
  
  
  struct pi_lcd_data {
  	uint8_t	disp_func;	/* Display Function */
  	uint8_t	disp_cntl;	/* Display Control */
  	uint8_t disp_mode;	/* Display Mode */
  	uint8_t	cfg_rows;
  	uint8_t	row_offsets[4];
  };
  
  /* Default Configuration - User can update */
  struct pi_lcd_data lcd_data = {
  	.disp_func = LCD_4BIT_MODE | LCD_1_LINE | LCD_5x8_DOTS,
  	.disp_cntl = 0,
  	.disp_mode = 0,
  	.cfg_rows = 0,
  	.row_offsets = {0x00, 0x00, 0x00, 0x00}
  };
  
  void _set_row_offsets(int8_t row0, int8_t row1, int8_t row2, int8_t row3)
  {
  	lcd_data.row_offsets[0] = row0;
  	lcd_data.row_offsets[1] = row1;
  	lcd_data.row_offsets[2] = row2;
  	lcd_data.row_offsets[3] = row3;
  }
  
  
  void _pi_lcd_toggle_enable(struct device *gpio_dev)
  {
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC25_E, LOW);
  	k_msleep(ENABLE_DELAY);
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC25_E, HIGH);
  	k_msleep(ENABLE_DELAY);
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC25_E, LOW);
  	k_msleep(ENABLE_DELAY);
  }
  
  
  void _pi_lcd_4bits_wr(struct device *gpio_dev, uint8_t bits)
  {
  	/* High bits */
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC24_D4, LOW);
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC23_D5, LOW);
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC22_D6, LOW);
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC21_D7, LOW);
  	if ((bits & BIT(4)) == BIT(4)) {
  		GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC24_D4, HIGH);
  	}
  	if ((bits & BIT(5)) == BIT(5)) {
  		GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC23_D5, HIGH);
  	}
  	if ((bits & BIT(6)) == BIT(6)) {
  		GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC22_D6, HIGH);
  	}
  	if ((bits & BIT(7)) == BIT(7)) {
  		GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC21_D7, HIGH);
  	}
  
  	/* Toggle 'Enable' pin */
  	_pi_lcd_toggle_enable(gpio_dev);
  
  	/* Low bits */
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC24_D4, LOW);
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC23_D5, LOW);
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC22_D6, LOW);
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC21_D7, LOW);
  	if ((bits & BIT(0)) == BIT(0)) {
  		GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC24_D4, HIGH);
  	}
  	if ((bits & BIT(1)) == BIT(1)) {
  		GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC23_D5, HIGH);
  	}
  	if ((bits & BIT(2)) == BIT(2)) {
  		GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC22_D6, HIGH);
  	}
  	if ((bits & BIT(3)) == BIT(3)) {
  		GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC21_D7, HIGH);
  	}
  
  	/* Toggle 'Enable' pin */
  	_pi_lcd_toggle_enable(gpio_dev);
  }
  
  void _pi_lcd_8bits_wr(struct device *gpio_dev, uint8_t bits)
  {
  	/* High bits */
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC21_D7, LOW);
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC22_D6, LOW);
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC23_D5, LOW);
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC24_D4, LOW);
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC15_D3, LOW);
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC14_D2, LOW);
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC13_D1, LOW);
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC12_D0, LOW);
  
  	/* Low bits */
  	if ((bits & BIT(0)) == BIT(0)) {
  		GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC12_D0, HIGH);
  	}
  	if ((bits & BIT(1)) == BIT(1)) {
  		GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC13_D1, HIGH);
  	}
  	if ((bits & BIT(2)) == BIT(2)) {
  		GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC14_D2, HIGH);
  	}
  	if ((bits & BIT(3)) == BIT(3)) {
  		GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC15_D3, HIGH);
  	}
  	if ((bits & BIT(4)) == BIT(4)) {
  		GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC24_D4, HIGH);
  	}
  	if ((bits & BIT(5)) == BIT(5)) {
  		GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC23_D5, HIGH);
  	}
  	if ((bits & BIT(6)) == BIT(6)) {
  		GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC22_D6, HIGH);
  	}
  	if ((bits & BIT(7)) == BIT(7)) {
  		GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC21_D7, HIGH);
  	}
  
  	/* Toggle 'Enable' pin */
  	_pi_lcd_toggle_enable(gpio_dev);
  }
  
  void _pi_lcd_data(struct device *gpio_dev, uint8_t bits)
  {
  	if (lcd_data.disp_func & LCD_8BIT_MODE) {
  		_pi_lcd_8bits_wr(gpio_dev, bits);
  	} else {
  		_pi_lcd_4bits_wr(gpio_dev, bits);
  	}
  }
  
  void _pi_lcd_command(struct device *gpio_dev, uint8_t bits)
  {
  	/* mode = False for command */
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC28_RS, LOW);
  	_pi_lcd_data(gpio_dev, bits);
  }
  
  void _pi_lcd_write(struct device *gpio_dev, uint8_t bits)
  {
  	/* mode = True for character */
  	GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC28_RS, HIGH);
  	_pi_lcd_data(gpio_dev, bits);
  }
  
  
  /*************************
   * USER can use these APIs
   *************************/
  /** Home */
  void pi_lcd_home(struct device *gpio_dev)
  {
  	_pi_lcd_command(gpio_dev, LCD_RETURN_HOME);
  	k_sleep(K_MSEC(2));			/* wait for 2ms */
  }
  
  /** Set curson position */
  void pi_lcd_set_cursor(struct device *gpio_dev, uint8_t col, uint8_t row)
  {
  	size_t max_lines;
  
  	max_lines = ARRAY_SIZE(lcd_data.row_offsets);
  	if (row >= max_lines) {
  		row = max_lines - 1;	/* Count rows starting w/0 */
  	}
  	if (row >= lcd_data.cfg_rows) {
  		row = lcd_data.cfg_rows - 1;    /* Count rows starting w/0 */
  	}
  	_pi_lcd_command(gpio_dev, (LCD_SET_DDRAM_ADDR | (col + lcd_data.row_offsets[row])));
  }
  
  
  /** Clear display */
  void pi_lcd_clear(struct device *gpio_dev)
  {
  	_pi_lcd_command(gpio_dev, LCD_CLEAR_DISPLAY);
  	k_sleep(K_MSEC(2));			/* wait for 2ms */
  }
  
  
  /** Display ON */
  void pi_lcd_display_on(struct device *gpio_dev)
  {
  	lcd_data.disp_cntl |= LCD_DISPLAY_ON;
  	_pi_lcd_command(gpio_dev,
  			LCD_DISPLAY_CONTROL | lcd_data.disp_cntl);
  }
  
  /** Display OFF */
  void pi_lcd_display_off(struct device *gpio_dev)
  {
  	lcd_data.disp_cntl &= ~LCD_DISPLAY_ON;
  	_pi_lcd_command(gpio_dev,
  			LCD_DISPLAY_CONTROL | lcd_data.disp_cntl);
  }
  
  
  /** Turns cursor off */
  void pi_lcd_cursor_off(struct device *gpio_dev)
  {
  	lcd_data.disp_cntl &= ~LCD_CURSOR_ON;
  	_pi_lcd_command(gpio_dev,
  			LCD_DISPLAY_CONTROL | lcd_data.disp_cntl);
  }
  
  /** Turn cursor on */
  void pi_lcd_cursor_on(struct device *gpio_dev)
  {
  	lcd_data.disp_cntl |= LCD_CURSOR_ON;
  	_pi_lcd_command(gpio_dev,
  			LCD_DISPLAY_CONTROL | lcd_data.disp_cntl);
  }
  
  
  /** Turn off the blinking cursor */
  void pi_lcd_blink_off(struct device *gpio_dev)
  {
  	lcd_data.disp_cntl &= ~LCD_BLINK_ON;
  	_pi_lcd_command(gpio_dev,
  			LCD_DISPLAY_CONTROL | lcd_data.disp_cntl);
  }
  
  /** Turn on the blinking cursor */
  void pi_lcd_blink_on(struct device *gpio_dev)
  {
  	lcd_data.disp_cntl |= LCD_BLINK_ON;
  	_pi_lcd_command(gpio_dev,
  			LCD_DISPLAY_CONTROL | lcd_data.disp_cntl);
  }
  
  /** Scroll the display left without changing the RAM */
  void pi_lcd_scroll_left(struct device *gpio_dev)
  {
  	_pi_lcd_command(gpio_dev, LCD_CURSOR_SHIFT |
  			LCD_DISPLAY_MOVE | LCD_MOVE_LEFT);
  }
  
  /** Scroll the display right without changing the RAM */
  void pi_lcd_scroll_right(struct device *gpio_dev)
  {
  	_pi_lcd_command(gpio_dev, LCD_CURSOR_SHIFT |
  			LCD_DISPLAY_MOVE | LCD_MOVE_RIGHT);
  }
  
  /** Text that flows from left to right */
  void pi_lcd_left_to_right(struct device *gpio_dev)
  {
  	lcd_data.disp_mode |= LCD_ENTRY_LEFT;
  	_pi_lcd_command(gpio_dev,
  			LCD_ENTRY_MODE_SET | lcd_data.disp_cntl);
  }
  
  /** Text that flows from right to left */
  void pi_lcd_right_to_left(struct device *gpio_dev)
  {
  	lcd_data.disp_mode &= ~LCD_ENTRY_LEFT;
  	_pi_lcd_command(gpio_dev,
  			LCD_ENTRY_MODE_SET | lcd_data.disp_cntl);
  }
  
  /** Right justify text from the cursor location */
  void pi_lcd_auto_scroll_right(struct device *gpio_dev)
  {
  	lcd_data.disp_mode |= LCD_ENTRY_SHIFT_INCREMENT;
  	_pi_lcd_command(gpio_dev,
  			LCD_ENTRY_MODE_SET | lcd_data.disp_cntl);
  }
  
  /** Left justify text from the cursor location */
  void pi_lcd_auto_scroll_left(struct device *gpio_dev)
  {
  	lcd_data.disp_mode &= ~LCD_ENTRY_SHIFT_INCREMENT;
  	_pi_lcd_command(gpio_dev,
  			LCD_ENTRY_MODE_SET | lcd_data.disp_cntl);
  }
  
  void pi_lcd_string(struct device *gpio_dev, char *msg)
  {
  	int i;
  	int len = 0;
  	uint8_t data;
  
  	len = strlen(msg);
  	if (len > LCD_WIDTH) {
  		printk("Too long message! len %d %s\n", len, msg);
  	}
  
  	for (i = 0; i < len; i++) {
  		data = msg[i];
  		_pi_lcd_write(gpio_dev, data);
  	}
  }
  
  
  /** LCD initialization function */
  void pi_lcd_init(struct device *gpio_dev, uint8_t cols, uint8_t rows, uint8_t dotsize)
  {
  	if (rows > 1) {
  		lcd_data.disp_func |= LCD_2_LINE;
  	}
  	lcd_data.cfg_rows = rows;
  
  	_set_row_offsets(0x00, 0x40, 0x00 + cols, 0x40 + cols);
  
  	/* For 1 line displays, a 10 pixel high font looks OK */
  	if ((dotsize != LCD_5x8_DOTS) && (rows == 1U)) {
  		lcd_data.disp_func |= LCD_5x10_DOTS;
  	}
  
  	/* SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
  	 * according to datasheet, we need at least 40ms after power rises
  	 * above 2.7V before sending commands. Arduino can turn on way
  	 * before 4.5V so we'll wait 50
  	 */
  	k_sleep(K_MSEC(50));
  
  	/* this is according to the hitachi HD44780 datasheet
  	 * figure 23/24, pg 45/46 try to set 4/8 bits mode
  	 */
  	if (lcd_data.disp_func & LCD_8BIT_MODE) {
  		/* 1st try */
  		_pi_lcd_command(gpio_dev, 0x30);
  		k_sleep(K_MSEC(5));			/* wait for 5ms */
  
  		/* 2nd try */
  		_pi_lcd_command(gpio_dev, 0x30);
  		k_sleep(K_MSEC(5));			/* wait for 5ms */
  
  		/* 3rd try */
  		_pi_lcd_command(gpio_dev, 0x30);
  		k_sleep(K_MSEC(1));			/* wait for 1ms */
  
  		/* Set 4bit interface */
  		_pi_lcd_command(gpio_dev, 0x30);
  	} else {
  		/* 1st try */
  		_pi_lcd_command(gpio_dev, 0x03);
  		k_sleep(K_MSEC(5));			/* wait for 5ms */
  
  		/* 2nd try */
  		_pi_lcd_command(gpio_dev, 0x03);
  		k_sleep(K_MSEC(5));			/* wait for 5ms */
  
  		/* 3rd try */
  		_pi_lcd_command(gpio_dev, 0x03);
  		k_sleep(K_MSEC(1));			/* wait for 1ms */
  
  		/* Set 4bit interface */
  		_pi_lcd_command(gpio_dev, 0x02);
  	}
  
  	/* finally, set # lines, font size, etc. */
  	_pi_lcd_command(gpio_dev, (LCD_FUNCTION_SET | lcd_data.disp_func));
  
  	/* turn the display on with no cursor or blinking default */
  	lcd_data.disp_cntl = LCD_DISPLAY_ON | LCD_CURSOR_OFF | LCD_BLINK_OFF;
  	pi_lcd_display_on(gpio_dev);
  
  	/* clear it off */
  	pi_lcd_clear(gpio_dev);
  
  	/* Initialize to default text direction */
  	lcd_data.disp_mode = LCD_ENTRY_LEFT | LCD_ENTRY_SHIFT_DECREMENT;
  	/* set the entry mode */
  	_pi_lcd_command(gpio_dev, LCD_ENTRY_MODE_SET | lcd_data.disp_mode);
  }
  
  void main(void)
  {
  	struct device *gpio_dev;
  
  	gpio_dev = device_get_binding(GPIO_DRV_NAME);
  	if (!gpio_dev) {
  		printk("Cannot find %s!\n", GPIO_DRV_NAME);
  		return;
  	}
  
  	/* Setup GPIO output */
  	GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC25_E, GPIO_OUTPUT);
  	GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC28_RS, GPIO_OUTPUT);
  	GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC12_D0, GPIO_OUTPUT);
  	GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC13_D1, GPIO_OUTPUT);
  	GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC14_D2, GPIO_OUTPUT);
  	GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC15_D3, GPIO_OUTPUT);
  	GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC24_D4, GPIO_OUTPUT);
  	GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC23_D5, GPIO_OUTPUT);
  	GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC22_D6, GPIO_OUTPUT);
  	GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC21_D7, GPIO_OUTPUT);
  
  	printk("LCD Init\n");
  	pi_lcd_init(gpio_dev, 20, 4, LCD_5x8_DOTS);
  
  	/* Clear display */
  	pi_lcd_clear(gpio_dev);
  
  	while (1) {
  		printk("Page 1: message\n");
  
  		pi_lcd_string(gpio_dev, "********************");
  		pi_lcd_set_cursor(gpio_dev, 0, 1);
  		pi_lcd_string(gpio_dev, "Arduino Due");
  		pi_lcd_right_to_left(gpio_dev);
  		pi_lcd_set_cursor(gpio_dev, 15, 2);
  		pi_lcd_string(gpio_dev, "yalpsiD DCL 4x02");
  		pi_lcd_set_cursor(gpio_dev, 19, 3);
  		pi_lcd_left_to_right(gpio_dev);
  		pi_lcd_string(gpio_dev, "********************");
  		k_msleep(MSEC_PER_SEC * 3U);
  
  		/* Clear display */
  		pi_lcd_clear(gpio_dev);
  
  		printk("Page 2: message\n");
  
  		pi_lcd_scroll_right(gpio_dev);
  		pi_lcd_string(gpio_dev, "-------------------");
  		pi_lcd_set_cursor(gpio_dev, 0, 1);
  		pi_lcd_scroll_right(gpio_dev);
  		pi_lcd_string(gpio_dev, "Zephyr Rocks!");
  		pi_lcd_set_cursor(gpio_dev, 0, 2);
  		pi_lcd_string(gpio_dev, "My super RTOS");
  		pi_lcd_set_cursor(gpio_dev, 0, 3);
  		pi_lcd_string(gpio_dev, "-------------------");
  		k_msleep(MSEC_PER_SEC * 3U);
  
  		/* Clear display */
  		pi_lcd_clear(gpio_dev);
  
  		printk("Page 3: message\n");
  
  		pi_lcd_set_cursor(gpio_dev, 0, 3);
  		pi_lcd_string(gpio_dev, "--------------------");
  		pi_lcd_home(gpio_dev);
  		pi_lcd_string(gpio_dev, "--------HOME--------");
  		pi_lcd_set_cursor(gpio_dev, 0, 1);
  		pi_lcd_string(gpio_dev, "I am home!");
  		pi_lcd_set_cursor(gpio_dev, 0, 2);
  		pi_lcd_string(gpio_dev, "");
  		k_msleep(MSEC_PER_SEC * 3U);
  
  		/* Clear display */
  		pi_lcd_clear(gpio_dev);
  	}
  }
  