drivers/auxdisplay/auxdisplay_jhd1313.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2015 Intel Corporation
  * Copyright (c) 2022 Nordic Semiconductor ASA
  * Copyright (c) 2022-2023 Jamie McCrae
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT jhd_jhd1313

 #include <string.h>
 #include <zephyr/device.h>
 #include <zephyr/devicetree.h>
 #include <zephyr/drivers/i2c.h>
 #include <zephyr/drivers/auxdisplay.h>
 #include <zephyr/kernel.h>
 #include <zephyr/sys/util.h>
 #include <zephyr/logging/log.h>

 LOG_MODULE_REGISTER(auxdisplay_jhd1313, CONFIG_AUXDISPLAY_LOG_LEVEL);

 #define JHD1313_BACKLIGHT_ADDR		(0x62)

 /* Defines for the JHD1313_CMD_CURSOR_SHIFT */
 #define JHD1313_CS_DISPLAY_SHIFT	(1 << 3)
 #define JHD1313_CS_RIGHT_SHIFT		(1 << 2)

 /* Defines for the JHD1313_CMD_INPUT_SET to change text direction */
 #define JHD1313_IS_SHIFT_INCREMENT	(1 << 1)
 #define JHD1313_IS_SHIFT_DECREMENT	(0 << 1)
 #define JHD1313_IS_ENTRY_LEFT		(1 << 0)
 #define JHD1313_IS_ENTRY_RIGHT		(0 << 0)

 /* Defines for the JHD1313_CMD_FUNCTION_SET */
 #define JHD1313_FS_8BIT_MODE		(1 << 4)
 #define JHD1313_FS_ROWS_2		(1 << 3)
 #define JHD1313_FS_ROWS_1		(0 << 3)
 #define JHD1313_FS_DOT_SIZE_BIG		(1 << 2)
 #define JHD1313_FS_DOT_SIZE_LITTLE	(0 << 2)

 /* LCD Display Commands */
 #define JHD1313_CMD_SCREEN_CLEAR	(1 << 0)
 #define JHD1313_CMD_CURSOR_RETURN	(1 << 1)
 #define JHD1313_CMD_INPUT_SET		(1 << 2)
 #define JHD1313_CMD_DISPLAY_SWITCH	(1 << 3)
 #define JHD1313_CMD_CURSOR_SHIFT	(1 << 4)
 #define JHD1313_CMD_FUNCTION_SET	(1 << 5)
 #define JHD1313_CMD_SET_CGRAM_ADDR	(1 << 6)
 #define JHD1313_CMD_SET_DDRAM_ADDR	(1 << 7)

 #define JHD1313_DS_DISPLAY_ON		(1 << 2)
 #define JHD1313_DS_CURSOR_ON		(1 << 1)
 #define JHD1313_DS_BLINK_ON		(1 << 0)

 #define JHD1313_LED_REG_R		0x04
 #define JHD1313_LED_REG_G		0x03
 #define JHD1313_LED_REG_B		0x02

 #define JHD1313_LINE_FIRST		0x80
 #define JHD1313_LINE_SECOND		0xC0

 #define CLEAR_DELAY_MS			20
 #define UPDATE_DELAY_MS			5

 struct auxdisplay_jhd1313_data {
 	uint8_t input_set;
 	bool power;
 	bool cursor;
 	bool blinking;
 	uint8_t function;
 	uint8_t backlight;
 };

 struct auxdisplay_jhd1313_config {
 	struct auxdisplay_capabilities capabilities;
 	struct i2c_dt_spec bus;
 };

 static const uint8_t colour_define[][4] = {
 	{ 0,   0,   0   },      /* Off */
 	{ 255, 255, 255 },	/* White */
 	{ 255, 0,   0   },      /* Red */
 	{ 0,   255, 0   },      /* Green */
 	{ 0,   0,   255 },      /* Blue */
 };

 static void auxdisplay_jhd1313_reg_set(const struct device *i2c, uint8_t addr, uint8_t data)
 {
 	uint8_t command[2] = { addr, data };

 	i2c_write(i2c, command, sizeof(command), JHD1313_BACKLIGHT_ADDR);
 }

 static int auxdisplay_jhd1313_print(const struct device *dev, const uint8_t *data, uint16_t size)
 {
 	const struct auxdisplay_jhd1313_config *config = dev->config;
 	uint8_t buf[] = { JHD1313_CMD_SET_CGRAM_ADDR, 0 };
 	int rc = 0;
 	int16_t i;

 	for (i = 0; i < size; i++) {
 		buf[1] = data[i];
 		rc = i2c_write_dt(&config->bus, buf, sizeof(buf));
 	}

 	return rc;
 }

 static int auxdisplay_jhd1313_cursor_position_set(const struct device *dev,
 						  enum auxdisplay_position type, int16_t x,
 						  int16_t y)
 {
 	unsigned char data[2];

 	if (type != AUXDISPLAY_POSITION_ABSOLUTE) {
 		return -EINVAL;
 	}

 	if (y == 0U) {
 		x |= JHD1313_LINE_FIRST;
 	} else {
 		x |= JHD1313_LINE_SECOND;
 	}

 	data[0] = JHD1313_CMD_SET_DDRAM_ADDR;
 	data[1] = x;

 	return i2c_write_dt(&config->bus, data, 2);
 }

 static int auxdisplay_jhd1313_clear(const struct device *dev)
 {
 	int rc;
 	const struct auxdisplay_jhd1313_config *config = dev->config;
 	uint8_t clear[] = { 0, JHD1313_CMD_SCREEN_CLEAR };

 	rc = i2c_write_dt(&config->bus, clear, sizeof(clear));
 	LOG_DBG("Clear, delay 20 ms");

 	k_sleep(K_MSEC(CLEAR_DELAY_MS));

 	return rc;
 }

 static int auxdisplay_jhd1313_update_display_state(
 				const struct auxdisplay_jhd1313_config *config,
 				struct auxdisplay_jhd1313_data *data)
 {
 	int rc;
 	uint8_t buf[] = { 0, JHD1313_CMD_DISPLAY_SWITCH };

 	if (data->power) {
 		buf[1] |= JHD1313_DS_DISPLAY_ON;
 	}

 	if (data->cursor) {
 		buf[1] |= JHD1313_DS_CURSOR_ON;
 	}

 	if (data->blinking) {
 		buf[1] |= JHD1313_DS_BLINK_ON;
 	}

 	rc = i2c_write_dt(&config->bus, buf, sizeof(buf));

 	LOG_DBG("Set display_state options, delay 5 ms");
 	k_sleep(K_MSEC(UPDATE_DELAY_MS));

 	return rc;
 }

 static int auxdisplay_jhd1313_cursor_set_enabled(const struct device *dev, bool enabled)
 {
 	const struct auxdisplay_jhd1313_config *config = dev->config;
 	struct auxdisplay_jhd1313_data *data = dev->data;

 	data->cursor = enabled;
 	return auxdisplay_jhd1313_update_display_state(config, data);
 }

 static int auxdisplay_jhd1313_position_blinking_set_enabled(const struct device *dev, bool enabled)
 {
 	const struct auxdisplay_jhd1313_config *config = dev->config;
 	struct auxdisplay_jhd1313_data *data = dev->data;

 	data->blinking = enabled;
 	return auxdisplay_jhd1313_update_display_state(config, data);
 }

 static void auxdisplay_jhd1313_input_state_set(const struct device *dev, uint8_t opt)
 {
 	const struct auxdisplay_jhd1313_config *config = dev->config;
 	struct auxdisplay_jhd1313_data *data = dev->data;
 	uint8_t buf[] = { 0, 0 };

 	data->input_set = opt;
 	buf[1] = (opt | JHD1313_CMD_INPUT_SET);

 	i2c_write_dt(&config->bus, buf, sizeof(buf));
 	LOG_DBG("Set the input_set, no delay");
 }

 static int auxdisplay_jhd1313_backlight_set(const struct device *dev, uint8_t colour)
 {
 	const struct auxdisplay_jhd1313_config *config = dev->config;
 	struct auxdisplay_jhd1313_data *data = dev->data;

 	if (colour > ARRAY_SIZE(colour_define)) {
 		LOG_WRN("Selected colour is too high a value");
 		return -EINVAL;
 	}

 	data->backlight = colour;

 	auxdisplay_jhd1313_reg_set(config->bus.bus, JHD1313_LED_REG_R, colour_define[colour][0]);
 	auxdisplay_jhd1313_reg_set(config->bus.bus, JHD1313_LED_REG_G, colour_define[colour][1]);
 	auxdisplay_jhd1313_reg_set(config->bus.bus, JHD1313_LED_REG_B, colour_define[colour][2]);

 	return 0;
 }

 static int auxdisplay_jhd1313_backlight_get(const struct device *dev, uint8_t *backlight)
 {
 	struct auxdisplay_jhd1313_data *data = dev->data;

 	*backlight = data->backlight;

 	return 0;
 }

 static void auxdisplay_jhd1313_function_set(const struct device *dev, uint8_t opt)
 {
 	const struct auxdisplay_jhd1313_config *config = dev->config;
 	struct auxdisplay_jhd1313_data *data = dev->data;
 	uint8_t buf[] = { 0, 0 };

 	data->function = opt;
 	buf[1] = (opt | JHD1313_CMD_FUNCTION_SET);

 	i2c_write_dt(&config->bus, buf, sizeof(buf));

 	LOG_DBG("Set function options, delay 5 ms");
 	k_sleep(K_MSEC(5));
 }

 static int auxdisplay_jhd1313_initialize(const struct device *dev)
 {
 	const struct auxdisplay_jhd1313_config *config = dev->config;
 	struct auxdisplay_jhd1313_data *data = dev->data;
 	uint8_t cmd;

 	LOG_DBG("Initialize called");

 	if (!device_is_ready(config->bus.bus)) {
 		return -ENODEV;
 	}

 	/*
 	 * Initialization sequence from the data sheet:
 	 * 1 - Power on
 	 *   - Wait for more than 30 ms AFTER VDD rises to 4.5v
 	 * 2 - Send FUNCTION set
 	 *   - Wait for 39 us
 	 * 3 - Send DISPLAY Control
 	 *   - wait for 39 us
 	 * 4 - send DISPLAY Clear
 	 *   - wait for 1.5 ms
 	 * 5 - send ENTRY Mode
 	 * 6 - Initialization is done
 	 */

 	/*
 	 * We're here! Let's just make sure we've had enough time for the
 	 * VDD to power on, so pause a little here, 30 ms min, so we go 50
 	 */
 	LOG_DBG("Delay 50 ms while the VDD powers on");
 	k_sleep(K_MSEC(50));

 	/* Configure everything for the display function first */
 	cmd = JHD1313_CMD_FUNCTION_SET | JHD1313_FS_ROWS_2;
 	auxdisplay_jhd1313_function_set(dev, cmd);

 	/* Turn the display on - by default no cursor and no blinking */
 	auxdisplay_jhd1313_update_display_state(config, data);

 	/* Clear the screen */
 	auxdisplay_jhd1313_clear(dev);

 	/* Initialize to the default text direction for romance languages */
 	cmd = JHD1313_IS_ENTRY_LEFT | JHD1313_IS_SHIFT_DECREMENT;

 	auxdisplay_jhd1313_input_state_set(dev, cmd);

 	/* Now power on the background RGB control */
 	LOG_INF("Configuring the RGB background");
 	auxdisplay_jhd1313_reg_set(config->bus.bus, 0x00, 0x00);
 	auxdisplay_jhd1313_reg_set(config->bus.bus, 0x01, 0x05);
 	auxdisplay_jhd1313_reg_set(config->bus.bus, 0x08, 0xAA);

 	/* Now set the background colour to white */
 	LOG_DBG("Background set to off");
 	auxdisplay_jhd1313_backlight_set(dev, 0);

 	return 0;
 }

 static int auxdisplay_jhd1313_display_on(const struct device *dev)
 {
 	struct auxdisplay_jhd1313_data *data = dev->data;

 	data->power = true;
 	return auxdisplay_jhd1313_update_display_state(config, data);
 }

 static int auxdisplay_jhd1313_display_off(const struct device *dev)
 {
 	struct auxdisplay_jhd1313_data *data = dev->data;

 	data->power = false;
 	return auxdisplay_jhd1313_update_display_state(config, data);
 }

 static int auxdisplay_jhd1313_capabilities_get(const struct device *dev,
 					       struct auxdisplay_capabilities *capabilities)
 {
 	const struct auxdisplay_jhd1313_config *config = dev->config;

 	memcpy(capabilities, &config->capabilities, sizeof(struct auxdisplay_capabilities));

 	return 0;
 }

 static const struct auxdisplay_driver_api auxdisplay_jhd1313_auxdisplay_api = {
 	.display_on = auxdisplay_jhd1313_display_on,
 	.display_off = auxdisplay_jhd1313_display_off,
 	.cursor_set_enabled = auxdisplay_jhd1313_cursor_set_enabled,
 	.position_blinking_set_enabled = auxdisplay_jhd1313_position_blinking_set_enabled,
 	.cursor_position_set = auxdisplay_jhd1313_cursor_position_set,
 	.capabilities_get = auxdisplay_jhd1313_capabilities_get,
 	.clear = auxdisplay_jhd1313_clear,
 	.backlight_get = auxdisplay_jhd1313_backlight_get,
 	.backlight_set = auxdisplay_jhd1313_backlight_set,
 	.write = auxdisplay_jhd1313_print,
 };

 #define AUXDISPLAY_JHD1313_DEVICE(inst)								\
 	static const struct auxdisplay_jhd1313_config auxdisplay_jhd1313_config_##inst = {	\
 		.capabilities = {								\
 			.columns = 2,								\
 			.rows = 16,								\
 			.mode = 0,								\
 			.brightness.minimum = AUXDISPLAY_LIGHT_NOT_SUPPORTED,			\
 			.brightness.maximum = AUXDISPLAY_LIGHT_NOT_SUPPORTED,			\
 			.backlight.minimum = 0,							\
 			.backlight.maximum = ARRAY_SIZE(colour_define),				\
 			.custom_characters = 0,							\
 		},										\
 		.bus = I2C_DT_SPEC_INST_GET(inst),						\
 	};											\
 	static struct auxdisplay_jhd1313_data auxdisplay_jhd1313_data_##inst = {		\
 		.power = true,									\
 		.cursor = false,								\
 		.blinking = false,								\
 	};											\
 	DEVICE_DT_INST_DEFINE(inst,								\
 			&auxdisplay_jhd1313_initialize,						\
 			NULL,									\
 			&auxdisplay_jhd1313_data_##inst,					\
 			&auxdisplay_jhd1313_config_##inst,					\
 			POST_KERNEL,								\
 			CONFIG_AUXDISPLAY_INIT_PRIORITY,					\
 			&auxdisplay_jhd1313_auxdisplay_api);

 DT_INST_FOREACH_STATUS_OKAY(AUXDISPLAY_JHD1313_DEVICE)
	/*
	* Copyright (c) 2015 Intel Corporation
	* Copyright (c) 2022 Nordic Semiconductor ASA
	* Copyright (c) 2022-2023 Jamie McCrae
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT jhd_jhd1313

	#include <string.h>
	#include <zephyr/device.h>
	#include <zephyr/devicetree.h>
	#include <zephyr/drivers/i2c.h>
	#include <zephyr/drivers/auxdisplay.h>
	#include <zephyr/kernel.h>
	#include <zephyr/sys/util.h>
	#include <zephyr/logging/log.h>

	LOG_MODULE_REGISTER(auxdisplay_jhd1313, CONFIG_AUXDISPLAY_LOG_LEVEL);

	#define JHD1313_BACKLIGHT_ADDR (0x62)

	/* Defines for the JHD1313_CMD_CURSOR_SHIFT */
	#define JHD1313_CS_DISPLAY_SHIFT (1 << 3)
	#define JHD1313_CS_RIGHT_SHIFT (1 << 2)

	/* Defines for the JHD1313_CMD_INPUT_SET to change text direction */
	#define JHD1313_IS_SHIFT_INCREMENT (1 << 1)
	#define JHD1313_IS_SHIFT_DECREMENT (0 << 1)
	#define JHD1313_IS_ENTRY_LEFT (1 << 0)
	#define JHD1313_IS_ENTRY_RIGHT (0 << 0)

	/* Defines for the JHD1313_CMD_FUNCTION_SET */
	#define JHD1313_FS_8BIT_MODE (1 << 4)
	#define JHD1313_FS_ROWS_2 (1 << 3)
	#define JHD1313_FS_ROWS_1 (0 << 3)
	#define JHD1313_FS_DOT_SIZE_BIG (1 << 2)
	#define JHD1313_FS_DOT_SIZE_LITTLE (0 << 2)

	/* LCD Display Commands */
	#define JHD1313_CMD_SCREEN_CLEAR (1 << 0)
	#define JHD1313_CMD_CURSOR_RETURN (1 << 1)
	#define JHD1313_CMD_INPUT_SET (1 << 2)
	#define JHD1313_CMD_DISPLAY_SWITCH (1 << 3)
	#define JHD1313_CMD_CURSOR_SHIFT (1 << 4)
	#define JHD1313_CMD_FUNCTION_SET (1 << 5)
	#define JHD1313_CMD_SET_CGRAM_ADDR (1 << 6)
	#define JHD1313_CMD_SET_DDRAM_ADDR (1 << 7)

	#define JHD1313_DS_DISPLAY_ON (1 << 2)
	#define JHD1313_DS_CURSOR_ON (1 << 1)
	#define JHD1313_DS_BLINK_ON (1 << 0)

	#define JHD1313_LED_REG_R 0x04
	#define JHD1313_LED_REG_G 0x03
	#define JHD1313_LED_REG_B 0x02

	#define JHD1313_LINE_FIRST 0x80
	#define JHD1313_LINE_SECOND 0xC0

	#define CLEAR_DELAY_MS 20
	#define UPDATE_DELAY_MS 5

	struct auxdisplay_jhd1313_data {
	uint8_t input_set;
	bool power;
	bool cursor;
	bool blinking;
	uint8_t function;
	uint8_t backlight;
	};

	struct auxdisplay_jhd1313_config {
	struct auxdisplay_capabilities capabilities;
	struct i2c_dt_spec bus;
	};

	static const uint8_t colour_define[][4] = {
	{ 0, 0, 0 }, /* Off */
	{ 255, 255, 255 }, /* White */
	{ 255, 0, 0 }, /* Red */
	{ 0, 255, 0 }, /* Green */
	{ 0, 0, 255 }, /* Blue */
	};

	static void auxdisplay_jhd1313_reg_set(const struct device *i2c, uint8_t addr, uint8_t data)
	{
	uint8_t command[2] = { addr, data };

	i2c_write(i2c, command, sizeof(command), JHD1313_BACKLIGHT_ADDR);
	}

	static int auxdisplay_jhd1313_print(const struct device dev, const uint8_t data, uint16_t size)
	{
	const struct auxdisplay_jhd1313_config *config = dev->config;
	uint8_t buf[] = { JHD1313_CMD_SET_CGRAM_ADDR, 0 };
	int rc = 0;
	int16_t i;

	for (i = 0; i < size; i++) {
	buf[1] = data[i];
	rc = i2c_write_dt(&config->bus, buf, sizeof(buf));
	}

	return rc;
	}

	static int auxdisplay_jhd1313_cursor_position_set(const struct device *dev,
	enum auxdisplay_position type, int16_t x,
	int16_t y)
	{
	unsigned char data[2];

	if (type != AUXDISPLAY_POSITION_ABSOLUTE) {
	return -EINVAL;
	}

	if (y == 0U) {
	x \|= JHD1313_LINE_FIRST;
	} else {
	x \|= JHD1313_LINE_SECOND;
	}

	data[0] = JHD1313_CMD_SET_DDRAM_ADDR;
	data[1] = x;

	return i2c_write_dt(&config->bus, data, 2);
	}

	static int auxdisplay_jhd1313_clear(const struct device *dev)
	{
	int rc;
	const struct auxdisplay_jhd1313_config *config = dev->config;
	uint8_t clear[] = { 0, JHD1313_CMD_SCREEN_CLEAR };

	rc = i2c_write_dt(&config->bus, clear, sizeof(clear));
	LOG_DBG("Clear, delay 20 ms");

	k_sleep(K_MSEC(CLEAR_DELAY_MS));

	return rc;
	}

	static int auxdisplay_jhd1313_update_display_state(
	const struct auxdisplay_jhd1313_config *config,
	struct auxdisplay_jhd1313_data *data)
	{
	int rc;
	uint8_t buf[] = { 0, JHD1313_CMD_DISPLAY_SWITCH };

	if (data->power) {
	buf[1] \|= JHD1313_DS_DISPLAY_ON;
	}

	if (data->cursor) {
	buf[1] \|= JHD1313_DS_CURSOR_ON;
	}

	if (data->blinking) {
	buf[1] \|= JHD1313_DS_BLINK_ON;
	}

	rc = i2c_write_dt(&config->bus, buf, sizeof(buf));

	LOG_DBG("Set display_state options, delay 5 ms");
	k_sleep(K_MSEC(UPDATE_DELAY_MS));

	return rc;
	}

	static int auxdisplay_jhd1313_cursor_set_enabled(const struct device *dev, bool enabled)
	{
	const struct auxdisplay_jhd1313_config *config = dev->config;
	struct auxdisplay_jhd1313_data *data = dev->data;

	data->cursor = enabled;
	return auxdisplay_jhd1313_update_display_state(config, data);
	}

	static int auxdisplay_jhd1313_position_blinking_set_enabled(const struct device *dev, bool enabled)
	{
	const struct auxdisplay_jhd1313_config *config = dev->config;
	struct auxdisplay_jhd1313_data *data = dev->data;

	data->blinking = enabled;
	return auxdisplay_jhd1313_update_display_state(config, data);
	}

	static void auxdisplay_jhd1313_input_state_set(const struct device *dev, uint8_t opt)
	{
	const struct auxdisplay_jhd1313_config *config = dev->config;
	struct auxdisplay_jhd1313_data *data = dev->data;
	uint8_t buf[] = { 0, 0 };

	data->input_set = opt;
	buf[1] = (opt \| JHD1313_CMD_INPUT_SET);

	i2c_write_dt(&config->bus, buf, sizeof(buf));
	LOG_DBG("Set the input_set, no delay");
	}

	static int auxdisplay_jhd1313_backlight_set(const struct device *dev, uint8_t colour)
	{
	const struct auxdisplay_jhd1313_config *config = dev->config;
	struct auxdisplay_jhd1313_data *data = dev->data;

	if (colour > ARRAY_SIZE(colour_define)) {
	LOG_WRN("Selected colour is too high a value");
	return -EINVAL;
	}

	data->backlight = colour;

	auxdisplay_jhd1313_reg_set(config->bus.bus, JHD1313_LED_REG_R, colour_define[colour][0]);
	auxdisplay_jhd1313_reg_set(config->bus.bus, JHD1313_LED_REG_G, colour_define[colour][1]);
	auxdisplay_jhd1313_reg_set(config->bus.bus, JHD1313_LED_REG_B, colour_define[colour][2]);

	return 0;
	}

	static int auxdisplay_jhd1313_backlight_get(const struct device dev, uint8_t backlight)
	{
	struct auxdisplay_jhd1313_data *data = dev->data;

	*backlight = data->backlight;

	return 0;
	}

	static void auxdisplay_jhd1313_function_set(const struct device *dev, uint8_t opt)
	{
	const struct auxdisplay_jhd1313_config *config = dev->config;
	struct auxdisplay_jhd1313_data *data = dev->data;
	uint8_t buf[] = { 0, 0 };

	data->function = opt;
	buf[1] = (opt \| JHD1313_CMD_FUNCTION_SET);

	i2c_write_dt(&config->bus, buf, sizeof(buf));

	LOG_DBG("Set function options, delay 5 ms");
	k_sleep(K_MSEC(5));
	}

	static int auxdisplay_jhd1313_initialize(const struct device *dev)
	{
	const struct auxdisplay_jhd1313_config *config = dev->config;
	struct auxdisplay_jhd1313_data *data = dev->data;
	uint8_t cmd;

	LOG_DBG("Initialize called");

	if (!device_is_ready(config->bus.bus)) {
	return -ENODEV;
	}

	/*
	* Initialization sequence from the data sheet:
	* 1 - Power on
	* - Wait for more than 30 ms AFTER VDD rises to 4.5v
	* 2 - Send FUNCTION set
	* - Wait for 39 us
	* 3 - Send DISPLAY Control
	* - wait for 39 us
	* 4 - send DISPLAY Clear
	* - wait for 1.5 ms
	* 5 - send ENTRY Mode
	* 6 - Initialization is done
	*/

	/*
	* We're here! Let's just make sure we've had enough time for the
	* VDD to power on, so pause a little here, 30 ms min, so we go 50
	*/
	LOG_DBG("Delay 50 ms while the VDD powers on");
	k_sleep(K_MSEC(50));

	/* Configure everything for the display function first */
	cmd = JHD1313_CMD_FUNCTION_SET \| JHD1313_FS_ROWS_2;
	auxdisplay_jhd1313_function_set(dev, cmd);

	/* Turn the display on - by default no cursor and no blinking */
	auxdisplay_jhd1313_update_display_state(config, data);

	/* Clear the screen */
	auxdisplay_jhd1313_clear(dev);

	/* Initialize to the default text direction for romance languages */
	cmd = JHD1313_IS_ENTRY_LEFT \| JHD1313_IS_SHIFT_DECREMENT;

	auxdisplay_jhd1313_input_state_set(dev, cmd);

	/* Now power on the background RGB control */
	LOG_INF("Configuring the RGB background");
	auxdisplay_jhd1313_reg_set(config->bus.bus, 0x00, 0x00);
	auxdisplay_jhd1313_reg_set(config->bus.bus, 0x01, 0x05);
	auxdisplay_jhd1313_reg_set(config->bus.bus, 0x08, 0xAA);

	/* Now set the background colour to white */
	LOG_DBG("Background set to off");
	auxdisplay_jhd1313_backlight_set(dev, 0);

	return 0;
	}

	static int auxdisplay_jhd1313_display_on(const struct device *dev)
	{
	struct auxdisplay_jhd1313_data *data = dev->data;

	data->power = true;
	return auxdisplay_jhd1313_update_display_state(config, data);
	}

	static int auxdisplay_jhd1313_display_off(const struct device *dev)
	{
	struct auxdisplay_jhd1313_data *data = dev->data;

	data->power = false;
	return auxdisplay_jhd1313_update_display_state(config, data);
	}

	static int auxdisplay_jhd1313_capabilities_get(const struct device *dev,
	struct auxdisplay_capabilities *capabilities)
	{
	const struct auxdisplay_jhd1313_config *config = dev->config;

	memcpy(capabilities, &config->capabilities, sizeof(struct auxdisplay_capabilities));

	return 0;
	}

	static const struct auxdisplay_driver_api auxdisplay_jhd1313_auxdisplay_api = {
	.display_on = auxdisplay_jhd1313_display_on,
	.display_off = auxdisplay_jhd1313_display_off,
	.cursor_set_enabled = auxdisplay_jhd1313_cursor_set_enabled,
	.position_blinking_set_enabled = auxdisplay_jhd1313_position_blinking_set_enabled,
	.cursor_position_set = auxdisplay_jhd1313_cursor_position_set,
	.capabilities_get = auxdisplay_jhd1313_capabilities_get,
	.clear = auxdisplay_jhd1313_clear,
	.backlight_get = auxdisplay_jhd1313_backlight_get,
	.backlight_set = auxdisplay_jhd1313_backlight_set,
	.write = auxdisplay_jhd1313_print,
	};

	#define AUXDISPLAY_JHD1313_DEVICE(inst) \
	static const struct auxdisplay_jhd1313_config auxdisplay_jhd1313_config_##inst = { \
	.capabilities = { \
	.columns = 2, \
	.rows = 16, \
	.mode = 0, \
	.brightness.minimum = AUXDISPLAY_LIGHT_NOT_SUPPORTED, \
	.brightness.maximum = AUXDISPLAY_LIGHT_NOT_SUPPORTED, \
	.backlight.minimum = 0, \
	.backlight.maximum = ARRAY_SIZE(colour_define), \
	.custom_characters = 0, \
	}, \
	.bus = I2C_DT_SPEC_INST_GET(inst), \
	}; \
	static struct auxdisplay_jhd1313_data auxdisplay_jhd1313_data_##inst = { \
	.power = true, \
	.cursor = false, \
	.blinking = false, \
	}; \
	DEVICE_DT_INST_DEFINE(inst, \
	&auxdisplay_jhd1313_initialize, \
	NULL, \
	&auxdisplay_jhd1313_data_##inst, \
	&auxdisplay_jhd1313_config_##inst, \
	POST_KERNEL, \
	CONFIG_AUXDISPLAY_INIT_PRIORITY, \
	&auxdisplay_jhd1313_auxdisplay_api);

	DT_INST_FOREACH_STATUS_OKAY(AUXDISPLAY_JHD1313_DEVICE)