doc: added wiki

README.md

@@ -1,53 +1,26 @@
-# ESP32 ESP-IDF component for liquid crystal display module 1602(4)A via I2C connection (PCF8574(A))
-
-## Tested on
-
-1. [ESP32 ESP-IDF v6.0.0](https://docs.espressif.com/projects/esp-idf/en/v6.0/esp32/index.html)
-
-## SAST Tools
-
-[PVS-Studio](https://pvs-studio.com/pvs-studio/?utm_source=website&utm_medium=github&utm_campaign=open_source) - static analyzer for C, C++, C#, and Java code.
+# ESP32 ESP-IDF component for LCD 1602A/1604A via I2C (PCF8574)
 
 ## Features
 
-1. Support of 16 LCD 160X on one bus.
+1. Support for HD44780-compatible 16x2 and 16x4 LCD displays via I2C.
+2. 4-bit interface mode for efficient data transfer through PCF8574 expander.
+3. Print strings, integers, and floating-point numbers to the display.
+4. Progress bar display with custom characters on any row.
+5. Cursor visibility and blink control.
+6. Row-specific clear operations in addition to full screen clear.
 
 ## Attention
 
-For correct operation, please enable the following settings in the menuconfig:
-
-```text
-CONFIG_FREERTOS_HZ=1000
-CONFIG_GPIO_CTRL_FUNC_IN_IRAM
-CONFIG_I2C_ISR_IRAM_SAFE
-CONFIG_I2C_MASTER_ISR_HANDLER_IN_IRAM
-```
-
-## Connection
-
-| 1602(4)A | PCF8574 |
-| -------- | ------- |
-|    RS    |   P0    |
-|    E     |   P2    |
-|    D4    |   P4    |
-|    D5    |   P5    |
-|    D6    |   P6    |
-|    D7    |   P7    |
-
-## Dependencies
-
-1. [zh_vector](https://github.com/aZholtikov/zh_vector)
-2. [zh_pcf8574](https://github.com/aZholtikov/zh_pcf8574)
+1. The PCF8574 expander handle must remain valid until the LCD handle is deinitialized.
+2. DDRAM location 0xFF must be configured as a custom character in CGRAM for progress bar to display correctly.
 
 ## Using
 
-In an existing project, run the following command to install the components:
+In an existing project, run the following command to install the component:
 
-```text
+```bash
 cd ../your_project/components
 git clone https://github.com/aZholtikov/zh_160x_i2c
-git clone https://github.com/aZholtikov/zh_pcf8574
-git clone https://github.com/aZholtikov/zh_vector
 ```
 
 In the application, add the component:
@@ -58,20 +31,20 @@ In the application, add the component:
 
 ## Examples
 
-One LCD on bus:
+### Basic Text Output Example
 
 ```c
 #include "zh_160x_i2c.h"
 
 #define I2C_PORT (I2C_NUM_MAX - 1)
 
-zh_pcf8574_handle_t lcd_160x_handle = {0};
+zh_pcf8574_handle_t *pcf8574_handle = NULL;
+zh_160x_i2c_handle_t *lcd_handle = NULL;
 
 void app_main(void)
 {
     esp_log_level_set("zh_160x_i2c", ESP_LOG_ERROR);
     esp_log_level_set("zh_pcf8574", ESP_LOG_ERROR);
-    esp_log_level_set("zh_vector", ESP_LOG_ERROR);
     i2c_master_bus_config_t i2c_bus_config = {
         .clk_source = I2C_CLK_SRC_DEFAULT,
         .i2c_port = I2C_PORT,
@@ -81,34 +54,157 @@ void app_main(void)
         .flags.enable_internal_pullup = true,
     };
     i2c_master_bus_handle_t i2c_bus_handle = NULL;
-    i2c_new_master_bus(&i2c_bus_config, &i2c_bus_handle);
-    zh_pcf8574_init_config_t config = ZH_PCF8574_INIT_CONFIG_DEFAULT();
-    config.i2c_handle = i2c_bus_handle;
-    config.i2c_address = 0x27;
-    zh_pcf8574_init(&config, &lcd_160x_handle);
-    zh_160x_init(&lcd_160x_handle, ZH_LCD_16X2);
-    for (;;)
+    esp_err_t ret = i2c_new_master_bus(&i2c_bus_config, &i2c_bus_handle);
+    if (ret != ESP_OK)
     {
-        zh_160x_on_cursor(&lcd_160x_handle, true);
-        zh_160x_set_cursor(&lcd_160x_handle, 0, 0);
-        zh_160x_print_char(&lcd_160x_handle, "LCD 160X");
-        zh_160x_set_cursor(&lcd_160x_handle, 1, 0);
-        zh_160x_print_char(&lcd_160x_handle, "Hello World!");
-        vTaskDelay(5000 / portTICK_PERIOD_MS);
-        zh_160x_off_cursor(&lcd_160x_handle);
-        zh_160x_set_cursor(&lcd_160x_handle, 0, 0);
-        zh_160x_print_char(&lcd_160x_handle, "Progress: ");
-        for (uint8_t i = 0; i <= 100; ++i)
-        {
-            zh_160x_set_cursor(&lcd_160x_handle, 0, 10);
-            zh_160x_print_int(&lcd_160x_handle, i);
-            zh_160x_print_char(&lcd_160x_handle, "%");
-            zh_160x_print_progress_bar(&lcd_160x_handle, 1, i);
-            vTaskDelay(100 / portTICK_PERIOD_MS);
-        }
-        vTaskDelay(5000 / portTICK_PERIOD_MS);
-        zh_160x_lcd_clear(&lcd_160x_handle);
-        vTaskDelay(5000 / portTICK_PERIOD_MS);
+        printf("I2C bus initialization error\n");
+        return;
     }
+    zh_pcf8574_init_config_t pcf_config = ZH_PCF8574_INIT_CONFIG_DEFAULT();
+    pcf_config.i2c_handle = i2c_bus_handle;
+    pcf_config.i2c_address = 0x27;
+    ret = zh_pcf8574_init(&pcf_config, &pcf8574_handle);
+    if (ret != ESP_OK)
+    {
+        printf("PCF8574 initialization error\n");
+        i2c_del_master_bus(i2c_bus_handle);
+        return;
+    }
+    ret = zh_160x_init(&pcf8574_handle, &lcd_handle, ZH_LCD_16X2);
+    if (ret != ESP_OK)
+    {
+        printf("LCD initialization error\n");
+        zh_pcf8574_deinit(&pcf8574_handle);
+        i2c_del_master_bus(i2c_bus_handle);
+        return;
+    }
+    zh_160x_set_cursor(&lcd_handle, 0, 0);
+    zh_160x_print_char(&lcd_handle, "LCD 160X");
+    zh_160x_set_cursor(&lcd_handle, 1, 0);
+    zh_160x_print_int(&lcd_handle, 42);
+    zh_160x_off_cursor(&lcd_handle);
+    zh_160x_deinit(&lcd_handle);
+    zh_pcf8574_deinit(&pcf8574_handle);
+    i2c_del_master_bus(i2c_bus_handle);
+}
+```
+
+### Float and Cursor Control Example
+
+```c
+#include "zh_160x_i2c.h"
+
+#define I2C_PORT (I2C_NUM_MAX - 1)
+
+zh_pcf8574_handle_t *pcf8574_handle = NULL;
+zh_160x_i2c_handle_t *lcd_handle = NULL;
+
+void app_main(void)
+{
+    esp_log_level_set("zh_160x_i2c", ESP_LOG_ERROR);
+    esp_log_level_set("zh_pcf8574", ESP_LOG_ERROR);
+    i2c_master_bus_config_t i2c_bus_config = {
+        .clk_source = I2C_CLK_SRC_DEFAULT,
+        .i2c_port = I2C_PORT,
+        .scl_io_num = GPIO_NUM_22,
+        .sda_io_num = GPIO_NUM_21,
+        .glitch_ignore_cnt = 7,
+        .flags.enable_internal_pullup = true,
+    };
+    i2c_master_bus_handle_t i2c_bus_handle = NULL;
+    esp_err_t ret = i2c_new_master_bus(&i2c_bus_config, &i2c_bus_handle);
+    if (ret != ESP_OK)
+    {
+        printf("I2C bus initialization error\n");
+        return;
+    }
+    zh_pcf8574_init_config_t pcf_config = ZH_PCF8574_INIT_CONFIG_DEFAULT();
+    pcf_config.i2c_handle = i2c_bus_handle;
+    pcf_config.i2c_address = 0x27;
+    ret = zh_pcf8574_init(&pcf_config, &pcf8574_handle);
+    if (ret != ESP_OK)
+    {
+        printf("PCF8574 initialization error\n");
+        i2c_del_master_bus(i2c_bus_handle);
+        return;
+    }
+    ret = zh_160x_init(&pcf8574_handle, &lcd_handle, ZH_LCD_16X2);
+    if (ret != ESP_OK)
+    {
+        printf("LCD initialization error\n");
+        zh_pcf8574_deinit(&pcf8574_handle);
+        i2c_del_master_bus(i2c_bus_handle);
+        return;
+    }
+    zh_160x_on_cursor(&lcd_handle, true);
+    zh_160x_set_cursor(&lcd_handle, 0, 0);
+    zh_160x_print_char(&lcd_handle, "Temp: ");
+    zh_160x_print_float(&lcd_handle, 23.67f, 2);
+    zh_160x_clear_row(&lcd_handle, 1);
+    zh_160x_set_cursor(&lcd_handle, 1, 0);
+    zh_160x_print_char(&lcd_handle, "Row cleared");
+    zh_160x_off_cursor(&lcd_handle);
+    zh_160x_deinit(&lcd_handle);
+    zh_pcf8574_deinit(&pcf8574_handle);
+    i2c_del_master_bus(i2c_bus_handle);
+}
+```
+
+---
+
+### Progress Bar Example
+
+```c
+#include "zh_160x_i2c.h"
+
+#define I2C_PORT (I2C_NUM_MAX - 1)
+
+zh_pcf8574_handle_t *pcf8574_handle = NULL;
+zh_160x_i2c_handle_t *lcd_handle = NULL;
+
+void app_main(void)
+{
+    esp_log_level_set("zh_160x_i2c", ESP_LOG_ERROR);
+    esp_log_level_set("zh_pcf8574", ESP_LOG_ERROR);
+    i2c_master_bus_config_t i2c_bus_config = {
+        .clk_source = I2C_CLK_SRC_DEFAULT,
+        .i2c_port = I2C_PORT,
+        .scl_io_num = GPIO_NUM_22,
+        .sda_io_num = GPIO_NUM_21,
+        .glitch_ignore_cnt = 7,
+        .flags.enable_internal_pullup = true,
+    };
+    i2c_master_bus_handle_t i2c_bus_handle = NULL;
+    esp_err_t ret = i2c_new_master_bus(&i2c_bus_config, &i2c_bus_handle);
+    if (ret != ESP_OK)
+    {
+        printf("I2C bus initialization error\n");
+        return;
+    }
+    zh_pcf8574_init_config_t pcf_config = ZH_PCF8574_INIT_CONFIG_DEFAULT();
+    pcf_config.i2c_handle = i2c_bus_handle;
+    pcf_config.i2c_address = 0x27;
+    ret = zh_pcf8574_init(&pcf_config, &pcf8574_handle);
+    if (ret != ESP_OK)
+    {
+        printf("PCF8574 initialization error\n");
+        i2c_del_master_bus(i2c_bus_handle);
+        return;
+    }
+    ret = zh_160x_init(&pcf8574_handle, &lcd_handle, ZH_LCD_16X2);
+    if (ret != ESP_OK)
+    {
+        printf("LCD initialization error\n");
+        zh_pcf8574_deinit(&pcf8574_handle);
+        i2c_del_master_bus(i2c_bus_handle);
+        return;
+    }
+    zh_160x_set_cursor(&lcd_handle, 0, 0);
+    zh_160x_print_char(&lcd_handle, "Progress: ");
+    zh_160x_print_progress_bar(&lcd_handle, 1, 75);
+    zh_160x_lcd_clear(&lcd_handle);
+    zh_160x_deinit(&lcd_handle);
+    zh_pcf8574_deinit(&pcf8574_handle);
+    i2c_del_master_bus(i2c_bus_handle);
 }
 ```

idf_component.yml

@@ -0,0 +1,10 @@
+description: ESP32 ESP-IDF component for LCD 1602A/1604A displays via I2C using PCF8574(A) expanders
+url: https://github.com/aZholtikov/zh_160x_i2c
+version: "5.0.1"
+license: "Apache-2.0"
+maintainers:
+  - "Alexey Zholtikov <alexey.zholtikov@yandex.ru>"
+dependencies:
+  idf: ">=5.0"
+  zh_pcf8574:
+    git: "https://github.com/aZholtikov/zh_pcf8574.git"

include/zh_160x_i2c.h

@@ -1,119 +1,228 @@
 /**
  * @file zh_160x_i2c.h
+ *
+ * @brief Driver for 16x2 and 16x4 LCD displays via I2C PCF8574 expander.
+ *
+ * Provides a high-level API for controlling HD44780-compatible LCD modules
+ * connected through a PCF8574 I/O expander. Supports text output, cursor
+ * control, and progress bar display.
+ *
+ * Key features:
+ * - 4-bit interface mode for efficient data transfer
+ * - Support for 16x2 and 16x4 LCD configurations
+ * - Text, integer, and floating-point number printing
+ * - Custom progress bar rendering
+ * - Cursor visibility and blink control
+ *
+ * @note All display operations require an initialized handle obtained through zh_160x_init().
+ * @note The text position counter of the HD44780 controller is shared by all rows,
+ *       so row addresses are remapped internally.
  */
 
 #pragma once
 
 #include "zh_pcf8574.h"
 
-#define ZH_LCD_16X2 1 /*!< LCD size 16x2. */
-#define ZH_LCD_16X4 0 /*!< LCD size 16x4. */
-
 #ifdef __cplusplus
 extern "C"
 {
 #endif
 
     /**
-     * @brief Initializes the LCD 160X.
+     * @brief Opaque handle for LCD 160x I2C display.
      *
-     * @param[in] handle Pointer to unique PCF8574 handle.
-     * @param[in] size LCD size (ZH_LCD_16X2 or ZH_LCD_16X4).
-     *
-     * @return ESP_OK if success or an error code otherwise.
+     * Internal structure containing the PCF8574 expander handle and
+     * current LCD size configuration.
      */
-    esp_err_t zh_160x_init(zh_pcf8574_handle_t *handle, bool size);
+    typedef struct _zh_160x_i2c_handle_t zh_160x_i2c_handle_t;
 
     /**
-     * @brief Clears the LCD screen.
-     *
-     * @param[in] handle Pointer to unique PCF8574 handle.
-     *
-     * @return ESP_OK if success or an error code otherwise.
+     * @brief Supported LCD display sizes.
      */
-    esp_err_t zh_160x_lcd_clear(zh_pcf8574_handle_t *handle);
+    typedef enum
+    {
+        ZH_LCD_16X2,   /*!< LCD size 16x2 */
+        ZH_LCD_16X4,   /*!< LCD size 16x4 */
+        ZH_LCD_NUM_MAX /*!< Number of supported LCD sizes */
+    } zh_160x_i2c_lcd_size_t;
+
+    /**
+     * @brief Initializes the LCD 160x display.
+     *
+     * Allocates and configures the LCD handle, then sends the initialization
+     * sequence to the LCD controller via the PCF8574 I2C expander.
+     * Configures 4-bit mode and sets default display parameters.
+     *
+     * @param[in] expander Pointer to the PCF8574 expander handle pointer (must not be NULL and must point to a non-NULL handle)
+     * @param[out] handle Pointer to the output LCD handle pointer (must not be NULL and must point to a NULL pointer)
+     * @param[in] size LCD size configuration (must be < ZH_LCD_NUM_MAX)
+     *
+     * @return ESP_OK on success
+     * @return ESP_ERR_INVALID_ARG if any parameter pointer is NULL or size is invalid
+     * @return ESP_ERR_INVALID_STATE if the output pointer already holds an initialized handle
+     * @return ESP_ERR_NO_MEM if memory allocation fails
+     * @return ESP_FAIL if LCD initialization sequence fails
+     */
+    esp_err_t zh_160x_init(zh_pcf8574_handle_t **expander, zh_160x_i2c_handle_t **handle, zh_160x_i2c_lcd_size_t size);
+
+    /**
+     * @brief Deinitializes the LCD 160x display and frees the handle.
+     *
+     * Releases the allocated memory for the LCD handle and sets the output
+     * pointer to NULL to prevent use-after-free.
+     *
+     * @param[in,out] handle Pointer to the LCD handle (must not be NULL)
+     *
+     * @return ESP_OK on success
+     * @return ESP_ERR_INVALID_ARG if handle pointer is NULL or points to a NULL handle
+     */
+    esp_err_t zh_160x_deinit(zh_160x_i2c_handle_t **handle);
+
+    /**
+     * @brief Clears the LCD screen and moves cursor to home position.
+     *
+     * Sends the LCD clear command (0x01) to erase all displayed text
+     * and reset the cursor to the upper-left corner (row 0, column 0).
+     *
+     * @param[in] handle Pointer to the LCD handle pointer (must not be NULL and must point to a non-NULL handle)
+     *
+     * @return ESP_OK on success
+     * @return ESP_ERR_INVALID_ARG if handle pointer is NULL or points to a NULL handle
+     * @return ESP_FAIL if sending the command fails
+     */
+    esp_err_t zh_160x_lcd_clear(zh_160x_i2c_handle_t **handle);
 
     /**
      * @brief Sets the cursor to a specific position on the LCD.
      *
-     * @param[in] handle Pointer to unique PCF8574 handle.
-     * @param[in] row The row number.
-     * @param[in] col The column number (0–15).
+     * Moves the cursor to the specified row and column.
+     * For 16x2 displays: rows 0–1, columns 0–15.
+     * For 16x4 displays: rows 0–3, columns 0–15.
      *
-     * @return ESP_OK if success or an error code otherwise.
+     * @param[in] handle Pointer to the LCD handle pointer (must not be NULL and must point to a non-NULL handle)
+     * @param[in] row Row number (must be < 2 for 16x2 and < 4 for 16x4)
+     * @param[in] col Column number (must be < 16)
+     *
+     * @return ESP_OK on success
+     * @return ESP_ERR_INVALID_ARG if any parameter pointer is NULL or coordinates are out of range
+     * @return ESP_FAIL if sending the command fails
+     *
+     * @note Row address mapping: row 0 = 0x00, row 1 = 0x40,
+     *       row 2 = 0x10, row 3 = 0x50.
      */
-    esp_err_t zh_160x_set_cursor(zh_pcf8574_handle_t *handle, uint8_t row, uint8_t col);
+    esp_err_t zh_160x_set_cursor(zh_160x_i2c_handle_t **handle, uint8_t row, uint8_t col);
 
     /**
-     * @brief Prints a string to the LCD.
+     * @brief Prints a string to the LCD at the current cursor position.
      *
-     * @param[in] handle Pointer to unique PCF8574 handle.
-     * @param[in] str Pointer to the string to be displayed.
+     * Transmits each character of the null-terminated string to the LCD
+     * in 4-bit mode. The cursor advances automatically after each character.
      *
-     * @return ESP_OK if success or an error code otherwise.
+     * @param[in] handle Pointer to the LCD handle pointer (must not be NULL and must point to a non-NULL handle)
+     * @param[in] str Null-terminated string to display (must not be NULL)
+     *
+     * @return ESP_OK on success
+     * @return ESP_ERR_INVALID_ARG if any parameter is NULL or handle points to a NULL handle
+     * @return ESP_FAIL if any character transmission fails
      */
-    esp_err_t zh_160x_print_char(zh_pcf8574_handle_t *handle, const char *str);
+    esp_err_t zh_160x_print_char(zh_160x_i2c_handle_t **handle, const char *str);
 
     /**
-     * @brief Prints an integer to the LCD.
+     * @brief Prints an integer to the LCD at the current cursor position.
      *
-     * @param[in] handle Pointer to unique PCF8574 handle.
-     * @param[in] num The integer to be displayed.
+     * Converts the integer to a decimal string and displays it.
+     * Supports the full range of signed 32-bit values
+     * (maximum 10 digits plus an optional sign).
      *
-     * @return ESP_OK if success or an error code otherwise.
+     * @param[in] handle Pointer to the LCD handle pointer (must not be NULL and must point to a non-NULL handle)
+     * @param[in] num Integer value to display
+     *
+     * @return ESP_OK on success
+     * @return ESP_ERR_INVALID_ARG if handle pointer is NULL or points to a NULL handle
+     * @return ESP_FAIL if string conversion or printing fails
      */
-    esp_err_t zh_160x_print_int(zh_pcf8574_handle_t *handle, int num);
+    esp_err_t zh_160x_print_int(zh_160x_i2c_handle_t **handle, int num);
 
     /**
-     * @brief Prints a floating-point number to the LCD.
+     * @brief Prints a floating-point number to the LCD at the current cursor position.
      *
-     * @param[in] handle Pointer to unique PCF8574 handle.
-     * @param[in] num The floating-point number to be displayed.
-     * @param[in] precision The number of decimal places to display.
+     * Converts the floating-point value to a decimal string with the
+     * specified number of decimal places and displays it. The converted
+     * text must fit into an internal 16-character buffer.
      *
-     * @return ESP_OK if success or an error code otherwise.
+     * @param[in] handle Pointer to the LCD handle pointer (must not be NULL and must point to a non-NULL handle)
+     * @param[in] num Floating-point value to display
+     * @param[in] precision Number of decimal places passed to snprintf (0–6 recommended)
+     *
+     * @return ESP_OK on success
+     * @return ESP_ERR_INVALID_ARG if handle pointer is NULL or points to a NULL handle
+     * @return ESP_FAIL if string conversion or printing fails
      */
-    esp_err_t zh_160x_print_float(zh_pcf8574_handle_t *handle, float num, uint8_t precision);
+    esp_err_t zh_160x_print_float(zh_160x_i2c_handle_t **handle, float num, uint8_t precision);
 
     /**
      * @brief Displays a progress bar on a specific row of the LCD.
      *
-     * @param[in] handle Pointer to unique PCF8574 handle.
-     * @param[in] row The row number.
-     * @param[in] progress The progress percentage (0–100).
+     * Renders a 16-block progress bar where filled blocks represent the
+     * progress percentage and empty blocks show the remainder. Filled
+     * blocks are printed as byte 0xFF, which displays as a solid block
+     * only when DDRAM location 0xFF is configured as a custom character
+     * (CGRAM pattern 7 on HD44780 controllers).
+     * Leaves the cursor at the end of the row.
      *
-     * @return ESP_OK if success or an error code otherwise.
+     * @param[in] handle Pointer to the LCD handle pointer (must not be NULL and must point to a non-NULL handle)
+     * @param[in] row Row number (must be < 2 for 16x2 and < 4 for 16x4)
+     * @param[in] progress Progress percentage (must be <= 100)
+     *
+     * @return ESP_OK on success
+     * @return ESP_ERR_INVALID_ARG if any parameter pointer is NULL, row is out of range, or progress exceeds 100
+     * @return ESP_FAIL if cursor positioning or character printing fails
      */
-    esp_err_t zh_160x_print_progress_bar(zh_pcf8574_handle_t *handle, uint8_t row, uint8_t progress);
+    esp_err_t zh_160x_print_progress_bar(zh_160x_i2c_handle_t **handle, uint8_t row, uint8_t progress);
 
     /**
      * @brief Clears a specific row on the LCD.
      *
-     * @param[in] handle Pointer to unique PCF8574 handle.
-     * @param[in] row The row number.
+     * Moves the cursor to the beginning of the specified row and fills
+     * all 16 positions with spaces to erase existing content.
+     * Leaves the cursor at the start of the cleared row.
      *
-     * @return ESP_OK if success or an error code otherwise.
+     * @param[in] handle Pointer to the LCD handle pointer (must not be NULL and must point to a non-NULL handle)
+     * @param[in] row Row number (must be < 2 for 16x2 and < 4 for 16x4)
+     *
+     * @return ESP_OK on success
+     * @return ESP_ERR_INVALID_ARG if any parameter pointer is NULL or row is out of range
+     * @return ESP_FAIL if cursor positioning or character printing fails
      */
-    esp_err_t zh_160x_clear_row(zh_pcf8574_handle_t *handle, uint8_t row);
+    esp_err_t zh_160x_clear_row(zh_160x_i2c_handle_t **handle, uint8_t row);
 
     /**
-     * @brief Enable the cursor.
+     * @brief Enables the cursor with optional blink mode.
      *
-     * @param[in] handle Pointer to unique PCF8574 handle.
-     * @param[in] blink Blink mode.
+     * Turns on the cursor and optionally enables blinking.
+     * Command 0x0F enables cursor with blink, 0x0E enables cursor only.
      *
-     * @return ESP_OK if success or an error code otherwise.
+     * @param[in] handle Pointer to the LCD handle pointer (must not be NULL and must point to a non-NULL handle)
+     * @param[in] blink Enable cursor blink mode
+     *
+     * @return ESP_OK on success
+     * @return ESP_ERR_INVALID_ARG if handle pointer is NULL or points to a NULL handle
+     * @return ESP_FAIL if sending the command fails
      */
-    esp_err_t zh_160x_on_cursor(zh_pcf8574_handle_t *handle, bool blink);
+    esp_err_t zh_160x_on_cursor(zh_160x_i2c_handle_t **handle, bool blink);
 
     /**
-     * @brief Disable the cursor.
+     * @brief Hides the cursor and disables blinking.
      *
-     * @param[in] handle Pointer to unique PCF8574 handle.
+     * Sends command 0x0C to turn off both cursor and cursor blink.
      *
-     * @return ESP_OK if success or an error code otherwise.
+     * @param[in] handle Pointer to the LCD handle pointer (must not be NULL and must point to a non-NULL handle)
+     *
+     * @return ESP_OK on success
+     * @return ESP_ERR_INVALID_ARG if handle pointer is NULL or points to a NULL handle
+     * @return ESP_FAIL if sending the command fails
      */
-    esp_err_t zh_160x_off_cursor(zh_pcf8574_handle_t *handle);
+    esp_err_t zh_160x_off_cursor(zh_160x_i2c_handle_t **handle);
 
 #ifdef __cplusplus
 }

version.txt

@@ -1 +1 @@
-4.1.0
+5.0.1

wiki_ru.md

@@ -0,0 +1,231 @@
+# Описание компонента zh_160x_i2c
+
+## Общие сведения
+
+**zh_160x_i2c** — это драйвер для ESP-IDF, реализующий управление 16x2 и 16x4 LCD-дисплеями (HD44780-совместимыми) через I2C-расширитель PCF8574.
+
+Компонент предоставляет высокоуровневый API для вывода текста, управления курсором, отображения индикатора прогресса и работы с числовыми данными на жидкокристаллических дисплеях.
+
+## Основные возможности
+
+1. **Поддержка дисплеев 16x2 и 16x4** — автоматическое определение конфигурации экрана.
+2. **4-битный режим интерфейса** — эффективная передача данных через линии D4–D7 (пин P4–P7 PCF8574).
+3. **Вывод строк, целых и вещественных чисел** — функции для форматированного вывода числовых данных.
+4. **Отображение индикатора прогресса** — 16-блочный прогресс-бар с настраиваемым процентом.
+5. **Управление курсором** — включение/выключение курсора и режима мерцания (blink).
+6. **Построчная очистка** — очистка произвольной строки дисплея.
+
+## Внутреннее устройство
+
+### Структура `zh_160x_i2c_handle_t`
+
+| Поле | Тип | Описание |
+|------|-----|----------|
+| `zh_pcf8574_handle` | `zh_pcf8574_handle_t *` | Указатель на управляющую структуру расширителя PCF8574 |
+| `zh_160x_i2c_lcd_size` | `zh_160x_i2c_lcd_size_t` | Конфигурация размера LCD (16x2 или 16x4) |
+
+Управляющая структура содержит ссылку на расширитель PCF8574 (который принадлежит вызывающей стороне) и текущую конфигурацию размера дисплея для расчёта адресов строк.
+
+### Управление памятью
+
+Память под структуру `zh_160x_i2c_handle_t` выделяется функцией `heap_caps_calloc()` с флагом `MALLOC_CAP_8BIT` при вызове `zh_160x_init()`. Освобождение происходит через `heap_caps_free()` в функции `zh_160x_deinit()`, после чего указатель устанавливается в `NULL` для предотвращения use-after-free.
+
+### Адресация строк HD44780
+
+HD44780-совместимые контроллеры используют нестандартную адресную карту строк:
+
+| Физическая строка | Адрес DDRAM |
+| ------------------- | ------------- |
+| 0 | `0x00` |
+| 1 | `0x40` |
+| 2 | `0x10` |
+| 3 | `0x50` |
+
+Массив `_lcd_row_addresses` содержит эти адреса и используется функцией `zh_160x_set_cursor()` для корректного позиционирования курсора.
+
+### Протокол инициализации LCD
+
+Инициализация follows HD44780 initialization protocol:
+
+1. Задержка 20 мс для стабилизации питания.
+2. Три команды `0x30` с импульсами Enable — перевод в 4-битный режим (последовательность «warm-up»).
+3. Команда `0x20` — установка 4-битного режима.
+4. Команда `0x28` — функция set: 4-бит, 2 строки, 5x8 точки.
+5. Команда `0x0C` — display on, cursor off, blink off.
+6. Команда `0x01` — clear display.
+7. Команда `0x06` — entry mode: cursor increment, no shift.
+
+## API (интерфейс)
+
+### Инициализация и освобождение
+
+| Функция | Описание |
+|---------|----------|
+| `zh_160x_init()` | Инициализирует LCD-дисплей, выделяет и настраивает управляющую структуру, отправляет последовательность инициализации контроллеру LCD через расширитель PCF8574. |
+| `zh_160x_deinit()` | Освобождает выделенную память управляющей структуры и устанавливает указатель в `NULL`. |
+
+### Позиционирование и очистка
+
+| Функция | Описание |
+| --------- | ---------- |
+| `zh_160x_lcd_clear()` | Очищает весь экран LCD и перемещает курсор в домашнюю позицию (строка 0, столбец 0). |
+| `zh_160x_set_cursor()` | Устанавливает курсор в указанную позицию (строка и столбец). Для 16x2: строки 0–1, столбцы 0–15. Для 16x4: строки 0–3, столбцы 0–15. |
+| `zh_160x_clear_row()` | Очищает указанную строку (заполняет 16 пробелами) и возвращает курсор в начало строки. |
+
+### Вывод данных
+
+| Функция | Описание |
+| --------- | ---------- |
+| `zh_160x_print_char()` | Выводит строку символов в текущую позицию курсора. Курсор автоматически перемещается после каждого символа. |
+| `zh_160x_print_int()` | Преобразует целое число (signed 32-bit) в десятичную строку и выводит на дисплей. |
+| `zh_160x_print_float()` | Преобразует число с плавающей точкой в строку с указанным количеством знаков после запятой и выводит на дисплей. |
+
+### Прогресс-бар и курсор
+
+| Функция | Описание |
+| --------- | ---------- |
+| `zh_160x_print_progress_bar()` | Отображает 16-блочный прогресс-бар на указанной строке. Заполненные блоки отображаются как символ с кодом `0xFF` (требует настройки CGRAM). |
+| `zh_160x_on_cursor()` | Включает курсор с опциональным режимом мерцания (blink). |
+| `zh_160x_off_cursor()` | Выключает курсор и режим мерцания. |
+
+## Потокобезопасность
+
+Компонент **не является потокобезопасным**. Все операции с LCD-дисплеем требуют внешних механизмов синхронизации (мьютексов, критических секций) при доступе из нескольких задач FreeRTOS. Управляющая структура `zh_160x_i2c_handle_t` не содержит внутренних примитивов синхронизации.
+
+## Алгоритмы
+
+### Отправка данных в 4-битном режиме
+
+Команды и данные передаются в два этапа (старший и младший нибблы) через линии D4–D7:
+
+1. **Отправка команды (`_zh_160x_send_command`)** — старший ниббл команды записывается на шины с маской `0x08` (RS=0, P3=1), затем генерируется импульс Enable. Затем младший ниббл (сдвинутый на 4 бита) записывается с той же маской и снова импульс Enable.
+2. **Отправка данных (`_zh_160x_send_data`)** — аналогично, но с маской `0x09` (RS=1 для режима данных, P3=1).
+3. **Импульс Enable (`_zh_160x_pulse`)** — установка пина P2 в HIGH, задержка 1 мс, установка в LOW, задержка 1 мс. Этот импульс Latch-ит данные в LCD-контроллер.
+
+### Прогресс-бар
+
+Процент прогресса конвертируется в количество заполненных блоков по формуле:
+
+```
+blocks = (progress * 16) / 100
+```
+
+Где `progress` — значение от 0 до 100. Заполненные блоки выводятся как `0xFF` (сплошной блок), пустые — как пробелы.
+
+## Примеры использования
+
+### Базовый вывод текста
+
+```c
+#include "zh_160x_i2c.h"
+
+zh_pcf8574_handle_t *pcf8574_handle = NULL;
+zh_160x_i2c_handle_t *lcd_160x_handle = NULL;
+
+void app_main(void)
+{
+    // Настройка I2C-шины и инициализация PCF8574...
+    zh_pcf8574_init_config_t config = ZH_PCF8574_INIT_CONFIG_DEFAULT();
+    config.i2c_handle = i2c_bus_handle;
+    config.i2c_address = 0x27;
+    zh_pcf8574_init(&config, &pcf8574_handle);
+
+    // Инициализация LCD 16x2
+    zh_160x_init(&pcf8574_handle, &lcd_160x_handle, ZH_LCD_16X2);
+
+    // Вывод текста на дисплей
+    zh_160x_set_cursor(&lcd_160x_handle, 0, 0);
+    zh_160x_print_char(&lcd_160x_handle, "Hello, LCD!");
+    zh_160x_set_cursor(&lcd_160x_handle, 1, 0);
+    zh_160x_print_char(&lcd_160x_handle, "ESP32 Ready");
+
+    // Очистка и освобождение ресурсов
+    vTaskDelay(5000 / portTICK_PERIOD_MS);
+    zh_160x_lcd_clear(&lcd_160x_handle);
+    zh_160x_deinit(&lcd_160x_handle);
+}
+```
+
+### Вывод числовых данных
+
+```c
+// Вывод целого числа
+int temperature = 25;
+zh_160x_set_cursor(&lcd_160x_handle, 0, 0);
+zh_160x_print_char(&lcd_160x_handle, "Temp: ");
+zh_160x_print_int(&lcd_160x_handle, temperature);
+zh_160x_print_char(&lcd_160x_handle, " C");
+
+// Вывод числа с плавающей точкой (2 знака после запятой)
+float voltage = 3.315f;
+zh_160x_set_cursor(&lcd_160x_handle, 1, 0);
+zh_160x_print_char(&lcd_160x_handle, "VCC: ");
+zh_160x_print_float(&lcd_160x_handle, voltage, 2);
+zh_160x_print_char(&lcd_160x_handle, " V");
+```
+
+### Отображение прогресс-бара
+
+```c
+// Прогресс-бар требует настройки CGRAM:
+// DDRAM адрес 0xFF должен быть сопоставлен с пользовательским символом (CGRAM pattern 7)
+
+for (uint8_t i = 0; i <= 100; i += 10)
+{
+    zh_160x_set_cursor(&lcd_160x_handle, 0, 0);
+    zh_160x_print_char(&lcd_160x_handle, "Progress: ");
+    zh_160x_print_int(&lcd_160x_handle, i);
+    zh_160x_print_char(&lcd_160x_handle, "%");
+    zh_160x_print_progress_bar(&lcd_160x_handle, 1, i);
+    vTaskDelay(500 / portTICK_PERIOD_MS);
+}
+
+zh_160x_lcd_clear(&lcd_160x_handle);
+zh_160x_deinit(&lcd_160x_handle);
+```
+
+## Логирование
+
+Компонент использует ESP-IDF логирование с тегом `"zh_160x_i2c"`.
+
+```c
+esp_log_level_set("zh_160x_i2c", ESP_LOG_ERROR);
+```
+
+Для включения подробного логирования установите уровень `ESP_LOG_DEBUG`.
+
+## Ошибки
+
+| Код | Описание |
+| ----- | ---------- |
+| `ESP_OK` | Успешное выполнение |
+| `ESP_ERR_INVALID_ARG` | Неверный аргумент (NULL-указатель, недопустимый размер дисплея, координаты вне диапазона) |
+| `ESP_ERR_INVALID_STATE` | LCD уже инициализирован (повторная инициализация без деинициализации) |
+| `ESP_ERR_NO_MEM` | Не удалось выделить память под управляющую структуру |
+| `ESP_FAIL` | Ошибка записи/чтения через PCF8574 или сбой последовательности инициализации |
+
+## Ограничения
+
+1. **Зависимость от компонента `zh_pcf8574`** — требуется установка и инициализация драйвера PCF8574 перед использованием LCD.
+2. **Буфер 16 символов** — функция `zh_160x_print_float()` использует внутренний буфер фиксированной длины; длинные числа могут быть усечены.
+3. **Отсутствие потокобезопасности** — все операции с LCD требуют внешней синхронизации при работе из нескольких задач FreeRTOS.
+4. **Прогресс-бар требует CGRAM** — для отображения заполненных блоков символ с кодом `0xFF` должен быть настроен как пользовательский символ в CGRAM (паттерн 7 HD44780).
+5. **Один I2C-адрес** — компонент рассчитан на один LCD-модуль на шину; множественные дисплеи требуют дополнительных расширителей или мультиплексирования.
+
+## Требования для сборки
+
+- ESP-IDF v5.0 или новее
+- Компонент `zh_pcf8574` (зависимость, устанавливается автоматически через idf_component_manager)
+- FreeRTOS (входит в состав ESP-IDF)
+- Настройка `CONFIG_FREERTOS_HZ=1000` в menuconfig
+
+## Установка
+
+```bash
+cd ваш_проект/components
+git clone https://github.com/aZholtikov/zh_160x_i2c
+```
+
+```c
+#include "zh_160x_i2c.h"
+```

zh_160x_i2c.c

@@ -13,89 +13,163 @@ static const char *TAG = "zh_160x_i2c";
         return err;                                  \
     }
 
-static esp_err_t _zh_160x_lcd_init(zh_pcf8574_handle_t *handle);
-static esp_err_t _zh_160x_send_command(zh_pcf8574_handle_t *handle, uint8_t command);
-static esp_err_t _zh_160x_send_data(zh_pcf8574_handle_t *handle, uint8_t data);
-static esp_err_t _zh_160x_pulse(zh_pcf8574_handle_t *handle);
+/**
+ * @brief LCD 160x I2C handle structure.
+ *
+ * Internal handle containing the PCF8574 expander pointer and
+ * the configured LCD size for row address calculations.
+ *
+ * @warning The expander handle is owned by the caller and must remain valid
+ *          until the LCD handle is deinitialized.
+ */
+struct _zh_160x_i2c_handle_t
+{
+    zh_pcf8574_handle_t *zh_pcf8574_handle;      /*!< PCF8574 expander handle */
+    zh_160x_i2c_lcd_size_t zh_160x_i2c_lcd_size; /*!< Configured LCD size (16x2 or 16x4) */
+};
 
-esp_err_t zh_160x_init(zh_pcf8574_handle_t *handle, bool size) // -V2008
+static const uint8_t _lcd_row_addresses[] = {0x00, 0x40, 0x10, 0x50};
+
+/**
+ * @brief Initialize the LCD 160x display.
+ *
+ * Sends initialization sequence to the LCD controller via PCF8574 expander.
+ * Configures 4-bit mode and sets default display parameters.
+ * Follows HD44780 initialization protocol with function set commands.
+ *
+ * @param handle Pointer to the 160x I2C handle
+ *
+ * @return ESP_OK on success
+ * @return ESP_FAIL if any expander write or pulse operation fails
+ */
+static esp_err_t _zh_160x_lcd_init(zh_160x_i2c_handle_t *handle);
+
+/**
+ * @brief Send a command to the LCD.
+ *
+ * Transmits a command byte to the LCD in 4-bit mode. The high and low
+ * nibbles are sent sequentially on data lines D4-D7 (PCF8574 pins P4-P7),
+ * each followed by an enable pulse. Bit mask 0x08 keeps pin P3 high;
+ * RS (pin P0) and E (pin P2) are held low between pulses.
+ *
+ * @param handle Pointer to the 160x I2C handle
+ * @param command Command byte to send
+ *
+ * @return ESP_OK on success
+ * @return ESP_FAIL if any expander write or pulse operation fails
+ */
+static esp_err_t _zh_160x_send_command(zh_160x_i2c_handle_t *handle, uint8_t command);
+
+/**
+ * @brief Send data to the LCD.
+ *
+ * Transmits a data byte to the LCD in 4-bit mode. The high and low
+ * nibbles are sent sequentially on data lines D4-D7 (PCF8574 pins P4-P7),
+ * each followed by an enable pulse. Bit mask 0x09 sets RS (pin P0) high
+ * for data mode and keeps pin P3 high; E (pin P2) is held low between pulses.
+ *
+ * @param handle Pointer to the 160x I2C handle
+ * @param data Data byte to send
+ *
+ * @return ESP_OK on success
+ * @return ESP_FAIL if any expander write or pulse operation fails
+ */
+static esp_err_t _zh_160x_send_data(zh_160x_i2c_handle_t *handle, uint8_t data);
+
+/**
+ * @brief Generate an enable pulse for the LCD.
+ *
+ * Toggles the enable line (PCF8574 pin P2) to latch data into the LCD.
+ * Sets the line high, delays 1ms, then sets it low with another 1ms delay.
+ * This pulse signals the LCD to process the data on the D4-D7 pins.
+ *
+ * @param handle Pointer to the 160x I2C handle
+ *
+ * @return ESP_OK on success
+ * @return ESP_FAIL if any GPIO write operation fails
+ */
+static esp_err_t _zh_160x_pulse(zh_160x_i2c_handle_t *handle);
+
+esp_err_t zh_160x_init(zh_pcf8574_handle_t **expander, zh_160x_i2c_handle_t **handle, zh_160x_i2c_lcd_size_t size)
 {
     ZH_LOGI("160X initialization started.");
-    ZH_ERROR_CHECK(handle != NULL, ESP_ERR_INVALID_ARG, NULL, "160X initialization failed. Invalid argument.");
-    ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_INVALID_STATE, NULL, "160X initialization failed. PCF8574 not initialized.");
-    handle->system = heap_caps_calloc(1, sizeof(uint8_t), MALLOC_CAP_8BIT);
-    ZH_ERROR_CHECK(handle->system != NULL, ESP_ERR_INVALID_ARG, NULL, "160X initialization failed. Memory allocation fail.");
-    *(uint8_t *)handle->system = size;
-    ZH_ERROR_CHECK(_zh_160x_lcd_init(handle) == ESP_OK, ESP_FAIL, NULL, "160X initialization failed. PCF8574 error.");
+    ZH_ERROR_CHECK(handle != NULL && expander != NULL && *expander != NULL && size < ZH_LCD_NUM_MAX, ESP_ERR_INVALID_ARG, NULL, "160X initialization failed. Invalid argument.");
+    ZH_ERROR_CHECK(*handle == NULL, ESP_ERR_INVALID_STATE, NULL, "160X initialization failed. 160X is already initialized.");
+    *handle = heap_caps_calloc(1, sizeof(zh_160x_i2c_handle_t), MALLOC_CAP_8BIT);
+    ZH_ERROR_CHECK(*handle != NULL, ESP_ERR_NO_MEM, NULL, "160X initialization failed. Failed to allocate 160X handle.");
+    (*handle)->zh_pcf8574_handle = *expander;
+    (*handle)->zh_160x_i2c_lcd_size = size;
+    ZH_ERROR_CHECK(_zh_160x_lcd_init(*handle) == ESP_OK, ESP_FAIL, heap_caps_free(*handle); *handle = NULL, "160X initialization failed. PCF8574 error.");
     ZH_LOGI("160X initialization completed successfully.");
     return ESP_OK;
 }
 
-esp_err_t zh_160x_lcd_clear(zh_pcf8574_handle_t *handle)
+esp_err_t zh_160x_deinit(zh_160x_i2c_handle_t **handle)
+{
+    ZH_LOGI("160X deinitialization started.");
+    ZH_ERROR_CHECK(handle != NULL && *handle != NULL, ESP_ERR_INVALID_ARG, NULL, "160X deinitialization failed. Invalid argument.");
+    heap_caps_free(*handle);
+    *handle = NULL;
+    ZH_LOGI("160X deinitialization completed successfully.");
+    return ESP_OK;
+}
+
+esp_err_t zh_160x_lcd_clear(zh_160x_i2c_handle_t **handle)
 {
     ZH_LOGI("160X display cleaning started.");
-    ZH_ERROR_CHECK(handle != NULL, ESP_ERR_INVALID_ARG, NULL, "160X display cleaning failed. Invalid argument.");
-    ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_INVALID_STATE, NULL, "160X display cleaning failed. PCF8574 not initialized.");
-    ZH_ERROR_CHECK(_zh_160x_send_command(handle, 0x01) == ESP_OK, ESP_FAIL, NULL, "160X display cleaning failed. PCF8574 error.");
+    ZH_ERROR_CHECK(handle != NULL && *handle != NULL, ESP_ERR_INVALID_ARG, NULL, "160X display cleaning failed. Invalid argument.");
+    ZH_ERROR_CHECK(_zh_160x_send_command(*handle, 0x01) == ESP_OK, ESP_FAIL, NULL, "160X display cleaning failed. PCF8574 error.");
     ZH_LOGI("160X display cleaning completed successfully.");
     return ESP_OK;
 }
 
-esp_err_t zh_160x_set_cursor(zh_pcf8574_handle_t *handle, uint8_t row, uint8_t col) // -V2008
+esp_err_t zh_160x_set_cursor(zh_160x_i2c_handle_t **handle, uint8_t row, uint8_t col)
 {
     ZH_LOGI("160X set cursor started.");
-    ZH_ERROR_CHECK(handle != NULL && row < ((*(uint8_t *)handle->system == ZH_LCD_16X2) ? 2 : 4) && col < 16, ESP_ERR_INVALID_ARG, NULL, "160X set cursor failed. Invalid argument.");
-    ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_INVALID_STATE, NULL, "160X set cursor failed. PCF8574 not initialized.");
-    ZH_ERROR_CHECK(_zh_160x_send_command(handle, 0x80 | ((row == 0) ? col : (row == 1) ? (0x40 + col)
-                                                                        : (row == 2)   ? (0x10 + col)
-                                                                                       : (0x50 + col))) == ESP_OK,
-                   ESP_FAIL, NULL, "160X set cursor failed. PCF8574 error.");
+    ZH_ERROR_CHECK(handle != NULL && *handle != NULL && row < (((*handle)->zh_160x_i2c_lcd_size == ZH_LCD_16X2) ? 2 : 4) && col < 16, ESP_ERR_INVALID_ARG, NULL, "160X set cursor failed. Invalid argument.");
+    ZH_ERROR_CHECK(_zh_160x_send_command(*handle, 0x80 | (_lcd_row_addresses[row] + col)) == ESP_OK, ESP_FAIL, NULL, "160X set cursor failed. PCF8574 error.");
     ZH_LOGI("160X set cursor completed successfully.");
     return ESP_OK;
 }
 
-esp_err_t zh_160x_print_char(zh_pcf8574_handle_t *handle, const char *str)
+esp_err_t zh_160x_print_char(zh_160x_i2c_handle_t **handle, const char *str)
 {
     ZH_LOGI("160X print char started.");
-    ZH_ERROR_CHECK(str != NULL && handle != NULL, ESP_ERR_INVALID_ARG, NULL, "160X print char failed. Invalid argument.");
-    ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_INVALID_STATE, NULL, "160X print char failed. PCF8574 not initialized.");
+    ZH_ERROR_CHECK(str != NULL && handle != NULL && *handle != NULL, ESP_ERR_INVALID_ARG, NULL, "160X print char failed. Invalid argument.");
     while (*str != 0)
     {
-        ZH_ERROR_CHECK(_zh_160x_send_data(handle, (uint8_t)*str++) == ESP_OK, ESP_FAIL, NULL, "160X print char failed. PCF8574 error.");
+        ZH_ERROR_CHECK(_zh_160x_send_data(*handle, (uint8_t)*str++) == ESP_OK, ESP_FAIL, NULL, "160X print char failed. PCF8574 error.");
     }
     ZH_LOGI("160X print char completed successfully.");
     return ESP_OK;
 }
 
-esp_err_t zh_160x_print_int(zh_pcf8574_handle_t *handle, int num)
+esp_err_t zh_160x_print_int(zh_160x_i2c_handle_t **handle, int num)
 {
     ZH_LOGI("160X print int started.");
-    ZH_ERROR_CHECK(handle != NULL, ESP_ERR_INVALID_ARG, NULL, "160X print int failed. Invalid argument.");
-    ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_INVALID_STATE, NULL, "160X print int failed. PCF8574 not initialized.");
-    char buffer[12];
-    sprintf(buffer, "%d", num);
+    ZH_ERROR_CHECK(handle != NULL && *handle != NULL, ESP_ERR_INVALID_ARG, NULL, "160X print int failed. Invalid argument.");
+    char buffer[16];
+    snprintf(buffer, sizeof(buffer), "%d", num);
     ZH_ERROR_CHECK(zh_160x_print_char(handle, buffer) == ESP_OK, ESP_FAIL, NULL, "160X print int failed. PCF8574 error.");
     ZH_LOGI("160X print int completed successfully.");
     return ESP_OK;
 }
 
-esp_err_t zh_160x_print_float(zh_pcf8574_handle_t *handle, float num, uint8_t precision)
+esp_err_t zh_160x_print_float(zh_160x_i2c_handle_t **handle, float num, uint8_t precision)
 {
     ZH_LOGI("160X print float started.");
-    ZH_ERROR_CHECK(handle != NULL, ESP_ERR_INVALID_ARG, NULL, "160X print float failed. Invalid argument.");
-    ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_INVALID_STATE, NULL, "160X print float failed. PCF8574 not initialized.");
+    ZH_ERROR_CHECK(handle != NULL && *handle != NULL, ESP_ERR_INVALID_ARG, NULL, "160X print float failed. Invalid argument.");
     char buffer[16];
-    sprintf(buffer, "%.*f", precision, num);
+    snprintf(buffer, sizeof(buffer), "%.*f", precision, num);
     ZH_ERROR_CHECK(zh_160x_print_char(handle, buffer) == ESP_OK, ESP_FAIL, NULL, "160X print float failed. PCF8574 error.");
     ZH_LOGI("160X print float completed successfully.");
     return ESP_OK;
 }
 
-esp_err_t zh_160x_print_progress_bar(zh_pcf8574_handle_t *handle, uint8_t row, uint8_t progress) // -V2008
+esp_err_t zh_160x_print_progress_bar(zh_160x_i2c_handle_t **handle, uint8_t row, uint8_t progress)
 {
     ZH_LOGI("160X print progress bar started.");
-    ZH_ERROR_CHECK(handle != NULL && row < ((*(uint8_t *)handle->system == ZH_LCD_16X2) ? 2 : 4) && progress <= 100, ESP_ERR_INVALID_ARG, NULL, "160X print progress bar failed. Invalid argument.");
-    ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_INVALID_STATE, NULL, "160X print progress bar failed. PCF8574 not initialized.");
+    ZH_ERROR_CHECK(handle != NULL && *handle != NULL && row < (((*handle)->zh_160x_i2c_lcd_size == ZH_LCD_16X2) ? 2 : 4) && progress <= 100, ESP_ERR_INVALID_ARG, NULL, "160X print progress bar failed. Invalid argument.");
     uint8_t blocks = (progress * 16) / 100;
     ZH_ERROR_CHECK(zh_160x_set_cursor(handle, row, 0) == ESP_OK, ESP_FAIL, NULL, "160X print progress bar failed. PCF8574 error.");
     for (uint8_t i = 0; i < 16; ++i)
@@ -113,11 +187,10 @@ esp_err_t zh_160x_print_progress_bar(zh_pcf8574_handle_t *handle, uint8_t row, u
     return ESP_OK;
 }
 
-esp_err_t zh_160x_clear_row(zh_pcf8574_handle_t *handle, uint8_t row) // -V2008
+esp_err_t zh_160x_clear_row(zh_160x_i2c_handle_t **handle, uint8_t row)
 {
     ZH_LOGI("160X clear row started.");
-    ZH_ERROR_CHECK(handle != NULL && row < ((*(uint8_t *)handle->system == ZH_LCD_16X2) ? 2 : 4), ESP_ERR_INVALID_ARG, NULL, "160X clear row failed. Invalid argument.");
-    ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_INVALID_STATE, NULL, "160X clear row failed. PCF8574 not initialized.");
+    ZH_ERROR_CHECK(handle != NULL && *handle != NULL && row < (((*handle)->zh_160x_i2c_lcd_size == ZH_LCD_16X2) ? 2 : 4), ESP_ERR_INVALID_ARG, NULL, "160X clear row failed. Invalid argument.");
     ZH_ERROR_CHECK(zh_160x_set_cursor(handle, row, 0) == ESP_OK, ESP_FAIL, NULL, "160X clear row failed. PCF8574 error.");
     for (uint8_t i = 0; i < 16; ++i)
     {
@@ -128,69 +201,65 @@ esp_err_t zh_160x_clear_row(zh_pcf8574_handle_t *handle, uint8_t row) // -V2008
     return ESP_OK;
 }
 
-esp_err_t zh_160x_on_cursor(zh_pcf8574_handle_t *handle, bool blink)
+esp_err_t zh_160x_on_cursor(zh_160x_i2c_handle_t **handle, bool blink)
 {
     ZH_LOGI("160X enable cursor started.");
-    ZH_ERROR_CHECK(handle != NULL, ESP_ERR_INVALID_ARG, NULL, "160X enable cursor failed. Invalid argument.");
-    ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_INVALID_STATE, NULL, "160X enable cursor failed. PCF8574 not initialized.");
-    ZH_ERROR_CHECK(_zh_160x_send_command(handle, (blink == true) ? 0x0f : 0x0e) == ESP_OK, ESP_FAIL, NULL, "160X enable cursor failed. PCF8574 error.");
+    ZH_ERROR_CHECK(handle != NULL && *handle != NULL, ESP_ERR_INVALID_ARG, NULL, "160X enable cursor failed. Invalid argument.");
+    ZH_ERROR_CHECK(_zh_160x_send_command(*handle, (blink == true) ? 0x0f : 0x0e) == ESP_OK, ESP_FAIL, NULL, "160X enable cursor failed. PCF8574 error.");
     ZH_LOGI("160X enable cursor completed successfully.");
     return ESP_OK;
 }
 
-esp_err_t zh_160x_off_cursor(zh_pcf8574_handle_t *handle)
+esp_err_t zh_160x_off_cursor(zh_160x_i2c_handle_t **handle)
 {
     ZH_LOGI("160X disable cursor started.");
-    ZH_ERROR_CHECK(handle != NULL, ESP_ERR_INVALID_ARG, NULL, "160X disable cursor failed. Invalid argument.");
-    ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_INVALID_STATE, NULL, "160X disable cursor failed. PCF8574 not initialized.");
-    ZH_ERROR_CHECK(_zh_160x_send_command(handle, 0x0c) == ESP_OK, ESP_FAIL, NULL, "160X disable cursor failed. PCF8574 error.");
+    ZH_ERROR_CHECK(handle != NULL && *handle != NULL, ESP_ERR_INVALID_ARG, NULL, "160X disable cursor failed. Invalid argument.");
+    ZH_ERROR_CHECK(_zh_160x_send_command(*handle, 0x0c) == ESP_OK, ESP_FAIL, NULL, "160X disable cursor failed. PCF8574 error.");
     ZH_LOGI("160X disable cursor completed successfully.");
     return ESP_OK;
 }
 
-static esp_err_t _zh_160x_lcd_init(zh_pcf8574_handle_t *handle) // -V2008
+static esp_err_t _zh_160x_lcd_init(zh_160x_i2c_handle_t *handle)
 {
     vTaskDelay(20 / portTICK_PERIOD_MS);
-    ZH_ERROR_CHECK(zh_pcf8574_write(handle, 0x30) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
+    ZH_ERROR_CHECK(zh_pcf8574_write(&handle->zh_pcf8574_handle, 0x30) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     ZH_ERROR_CHECK(_zh_160x_pulse(handle) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
-    ZH_ERROR_CHECK(zh_pcf8574_write(handle, 0x30) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
+    ZH_ERROR_CHECK(zh_pcf8574_write(&handle->zh_pcf8574_handle, 0x30) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     ZH_ERROR_CHECK(_zh_160x_pulse(handle) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
-    ZH_ERROR_CHECK(zh_pcf8574_write(handle, 0x30) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
+    ZH_ERROR_CHECK(zh_pcf8574_write(&handle->zh_pcf8574_handle, 0x30) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     ZH_ERROR_CHECK(_zh_160x_pulse(handle) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
-    ZH_ERROR_CHECK(zh_pcf8574_write(handle, 0x20) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
+    ZH_ERROR_CHECK(zh_pcf8574_write(&handle->zh_pcf8574_handle, 0x20) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     ZH_ERROR_CHECK(_zh_160x_pulse(handle) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     ZH_ERROR_CHECK(_zh_160x_send_command(handle, 0x28) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
-    ZH_ERROR_CHECK(_zh_160x_send_command(handle, 0x28) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
-    ZH_ERROR_CHECK(_zh_160x_send_command(handle, 0x28) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     ZH_ERROR_CHECK(_zh_160x_send_command(handle, 0x0C) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     ZH_ERROR_CHECK(_zh_160x_send_command(handle, 0x01) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     ZH_ERROR_CHECK(_zh_160x_send_command(handle, 0x06) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     return ESP_OK;
 }
 
-static esp_err_t _zh_160x_send_command(zh_pcf8574_handle_t *handle, uint8_t command)
+static esp_err_t _zh_160x_send_command(zh_160x_i2c_handle_t *handle, uint8_t command)
 {
-    ZH_ERROR_CHECK(zh_pcf8574_write(handle, (command & 0xF0) | 0x08) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
+    ZH_ERROR_CHECK(zh_pcf8574_write(&handle->zh_pcf8574_handle, (command & 0xF0) | 0x08) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     ZH_ERROR_CHECK(_zh_160x_pulse(handle) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
-    ZH_ERROR_CHECK(zh_pcf8574_write(handle, (command << 4) | 0x08) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
+    ZH_ERROR_CHECK(zh_pcf8574_write(&handle->zh_pcf8574_handle, (command << 4) | 0x08) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     ZH_ERROR_CHECK(_zh_160x_pulse(handle) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     return ESP_OK;
 }
 
-static esp_err_t _zh_160x_send_data(zh_pcf8574_handle_t *handle, uint8_t data)
+static esp_err_t _zh_160x_send_data(zh_160x_i2c_handle_t *handle, uint8_t data)
 {
-    ZH_ERROR_CHECK(zh_pcf8574_write(handle, (data & 0xF0) | 0x09) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
+    ZH_ERROR_CHECK(zh_pcf8574_write(&handle->zh_pcf8574_handle, (data & 0xF0) | 0x09) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     ZH_ERROR_CHECK(_zh_160x_pulse(handle) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
-    ZH_ERROR_CHECK(zh_pcf8574_write(handle, (data << 4) | 0x09) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
+    ZH_ERROR_CHECK(zh_pcf8574_write(&handle->zh_pcf8574_handle, (data << 4) | 0x09) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     ZH_ERROR_CHECK(_zh_160x_pulse(handle) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     return ESP_OK;
 }
 
-static esp_err_t _zh_160x_pulse(zh_pcf8574_handle_t *handle)
+static esp_err_t _zh_160x_pulse(zh_160x_i2c_handle_t *handle)
 {
-    ZH_ERROR_CHECK(zh_pcf8574_write_gpio(handle, ZH_PCF8574_GPIO_NUM_P2, ZH_PCF8574_GPIO_HIGH) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
+    ZH_ERROR_CHECK(zh_pcf8574_write_gpio(&handle->zh_pcf8574_handle, ZH_PCF8574_GPIO_NUM_P2, ZH_PCF8574_GPIO_HIGH) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     vTaskDelay(1 / portTICK_PERIOD_MS);
-    ZH_ERROR_CHECK(zh_pcf8574_write_gpio(handle, ZH_PCF8574_GPIO_NUM_P2, ZH_PCF8574_GPIO_LOW) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
+    ZH_ERROR_CHECK(zh_pcf8574_write_gpio(&handle->zh_pcf8574_handle, ZH_PCF8574_GPIO_NUM_P2, ZH_PCF8574_GPIO_LOW) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     vTaskDelay(1 / portTICK_PERIOD_MS);
     return ESP_OK;
 }