diff --git a/zh_pcf8574.c b/zh_pcf8574.c
index 01a471e..5085fa4 100755
--- a/zh_pcf8574.c
+++ b/zh_pcf8574.c
@@ -15,13 +15,15 @@ static const char *TAG = "zh_pcf8574";
 
 static uint8_t _interrupt_gpio = GPIO_NUM_MAX;
 static SemaphoreHandle_t _interrupt_semaphore = NULL;
-static uint8_t _gpio_matrix[8] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};
+static const uint8_t _gpio_matrix[8] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};
 
 static zh_vector_t _vector = {0};
 
 static esp_err_t _zh_pcf8574_validate_config(const zh_pcf8574_init_config_t *config);
-static esp_err_t _zh_pcf8574_configure_i2c_device(const zh_pcf8574_init_config_t *config, zh_pcf8574_handle_t *handle);
-static esp_err_t _zh_pcf8574_configure_interrupts(const zh_pcf8574_init_config_t *config, zh_pcf8574_handle_t handle);
+static esp_err_t _zh_pcf8574_gpio_init(const zh_pcf8574_init_config_t *config, zh_pcf8574_handle_t *handle);
+static esp_err_t _zh_pcf8574_i2c_init(const zh_pcf8574_init_config_t *config, zh_pcf8574_handle_t *handle);
+static esp_err_t _zh_pcf8574_resources_init(const zh_pcf8574_init_config_t *config);
+static esp_err_t _zh_pcf8574_task_init(const zh_pcf8574_init_config_t *config);
 static void _zh_pcf8574_isr_handler(void *arg);
 static void _zh_pcf8574_isr_processing_task(void *pvParameter);
 static esp_err_t _zh_pcf8574_read_register(zh_pcf8574_handle_t *handle, uint8_t *reg);
@@ -36,14 +38,20 @@ esp_err_t zh_pcf8574_init(const zh_pcf8574_init_config_t *config, zh_pcf8574_han
     ZH_ERROR_CHECK(handle->is_initialized == false, ESP_ERR_INVALID_STATE, NULL, "PCF8574 initialization failed. PCF8574 is already initialized.");
     esp_err_t err = _zh_pcf8574_validate_config(config);
     ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 initialization failed. Initial configuration check failed.");
-    err = _zh_pcf8574_configure_i2c_device(config, handle);
+    err = _zh_pcf8574_i2c_init(config, handle);
     ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 initialization failed. Failed to add I2C device.");
     err = _zh_pcf8574_write_register(handle, handle->gpio_work_mode);
-    ZH_ERROR_CHECK(err == ESP_OK, err, handle->is_initialized = false, "PCF8574 initialization failed. Failed initial GPIO setup.");
+    ZH_ERROR_CHECK(err == ESP_OK, err, i2c_master_bus_rm_device(handle->dev_handle), "PCF8574 initialization failed. Failed extender initial GPIO setup.");
     if (config->interrupt_gpio < GPIO_NUM_MAX && handle->gpio_work_mode != 0)
     {
-        err = _zh_pcf8574_configure_interrupts(config, *handle);
-        ZH_ERROR_CHECK(err == ESP_OK, err, handle->is_initialized = false, "PCF8574 initialization failed. Interrupt setup failed.");
+        err = _zh_pcf8574_gpio_init(config, handle);
+        ZH_ERROR_CHECK(err == ESP_OK, err, i2c_master_bus_rm_device(handle->dev_handle), "PCF8574 initialization failed. Interrupt GPIO initialization failed.");
+        err = _zh_pcf8574_resources_init(config);
+        ZH_ERROR_CHECK(err == ESP_OK, err, i2c_master_bus_rm_device(handle->dev_handle); gpio_isr_handler_remove(config->interrupt_gpio); gpio_uninstall_isr_service();
+                       gpio_reset_pin(config->interrupt_gpio); zh_vector_free(&_vector), "PCF8574 initialization failed. Resources initialization failed.");
+        err = _zh_pcf8574_task_init(config);
+        ZH_ERROR_CHECK(err == ESP_OK, err, i2c_master_bus_rm_device(handle->dev_handle); gpio_isr_handler_remove(config->interrupt_gpio); gpio_uninstall_isr_service();
+                       gpio_reset_pin(config->interrupt_gpio); zh_vector_free(&_vector); vSemaphoreDelete(_interrupt_semaphore), "PCF8574 initialization failed. Task initialization failed.");
     }
     handle->is_initialized = true;
     ZH_LOGI("PCF8574 initialization completed successfully.");
@@ -52,53 +60,115 @@ esp_err_t zh_pcf8574_init(const zh_pcf8574_init_config_t *config, zh_pcf8574_han
 
 esp_err_t zh_pcf8574_read(zh_pcf8574_handle_t *handle, uint8_t *reg)
 {
-    return _zh_pcf8574_read_register(handle, reg);
+    ZH_LOGI("PCF8574 read register started.");
+    ZH_ERROR_CHECK(handle != NULL || reg != NULL, ESP_ERR_INVALID_ARG, NULL, "PCF8574 read register failed. Invalid argument.");
+    ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_NOT_FOUND, NULL, "PCF8574 read register failed. PCF8574 not initialized.");
+    esp_err_t err = _zh_pcf8574_read_register(handle, reg);
+    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 read register failed.");
+    ZH_LOGI("PCF8574 read register completed successfully.");
+    return ESP_OK;
 }
 
 esp_err_t zh_pcf8574_write(zh_pcf8574_handle_t *handle, uint8_t reg)
 {
-    return _zh_pcf8574_write_register(handle, (reg | handle->gpio_work_mode));
+    ZH_LOGI("PCF8574 write register started.");
+    ZH_ERROR_CHECK(handle != NULL, ESP_ERR_INVALID_ARG, NULL, "PCF8574 write register failed. Invalid argument.");
+    ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_NOT_FOUND, NULL, "PCF8574 write register failed. PCF8574 not initialized.");
+    esp_err_t err = _zh_pcf8574_write_register(handle, (reg | handle->gpio_work_mode));
+    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 write register failed.");
+    ZH_LOGI("PCF8574 write register completed successfully.");
+    return ESP_OK;
 }
 
 esp_err_t zh_pcf8574_reset(zh_pcf8574_handle_t *handle)
 {
-    return _zh_pcf8574_write_register(handle, handle->gpio_work_mode);
+    ZH_LOGI("PCF8574 reset register started.");
+    ZH_ERROR_CHECK(handle != NULL, ESP_ERR_INVALID_ARG, NULL, "PCF8574 reset register failed. Invalid argument.");
+    ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_NOT_FOUND, NULL, "PCF8574 reset register failed. PCF8574 not initialized.");
+    esp_err_t err = _zh_pcf8574_write_register(handle, handle->gpio_work_mode);
+    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 reset register failed.");
+    ZH_LOGI("PCF8574 reset register completed successfully.");
+    return ESP_OK;
 }
 
 esp_err_t zh_pcf8574_read_gpio(zh_pcf8574_handle_t *handle, uint8_t gpio, bool *status)
 {
-    ZH_ERROR_CHECK(gpio <= 7, ESP_FAIL, NULL, "Invalid GPIO number.")
+    ZH_LOGI("PCF8574 read GPIO started.");
+    ZH_ERROR_CHECK(handle != NULL || status != NULL, ESP_ERR_INVALID_ARG, NULL, "PCF8574 read GPIO failed. Invalid argument.");
+    ZH_ERROR_CHECK(gpio <= 7, ESP_FAIL, NULL, "PCF8574 read GPIO failed. Invalid GPIO number.")
+    ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_NOT_FOUND, NULL, "PCF8574 read GPIO failed. PCF8574 not initialized.");
     uint8_t gpio_temp = _gpio_matrix[gpio];
     uint8_t reg_temp = 0;
     esp_err_t err = _zh_pcf8574_read_register(handle, &reg_temp);
+    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 read GPIO failed.");
     *status = ((reg_temp & gpio_temp) ? 1 : 0);
-    return err;
+    ZH_LOGI("PCF8574 read GPIO completed successfully.");
+    return ESP_OK;
 }
 
 esp_err_t zh_pcf8574_write_gpio(zh_pcf8574_handle_t *handle, uint8_t gpio, bool status)
 {
-    ZH_ERROR_CHECK(gpio <= 7, ESP_FAIL, NULL, "Invalid GPIO number.")
+    ZH_LOGI("PCF8574 write GPIO started.");
+    ZH_ERROR_CHECK(handle != NULL, ESP_ERR_INVALID_ARG, NULL, "PCF8574 write GPIO failed. Invalid argument.");
+    ZH_ERROR_CHECK(gpio <= 7, ESP_FAIL, NULL, "PCF8574 write GPIO failed. Invalid GPIO number.")
+    ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_NOT_FOUND, NULL, "PCF8574 write GPIO failed. PCF8574 not initialized.");
     uint8_t gpio_temp = _gpio_matrix[gpio];
+    esp_err_t err = ESP_OK;
     if (status == true)
     {
-        return _zh_pcf8574_write_register(handle, handle->gpio_status | handle->gpio_work_mode | gpio_temp);
+        err = _zh_pcf8574_write_register(handle, handle->gpio_status | handle->gpio_work_mode | gpio_temp);
     }
-    return _zh_pcf8574_write_register(handle, (handle->gpio_status ^ gpio_temp) | handle->gpio_work_mode);
+    else
+    {
+        err = _zh_pcf8574_write_register(handle, (handle->gpio_status ^ gpio_temp) | handle->gpio_work_mode);
+    }
+    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 write GPIO failed.");
+    ZH_LOGI("PCF8574 write GPIO completed successfully.");
+    return ESP_OK;
 }
 
 static esp_err_t _zh_pcf8574_validate_config(const zh_pcf8574_init_config_t *config)
 {
-    ZH_ERROR_CHECK(config != NULL, ESP_ERR_INVALID_ARG, NULL, "Invalid configuration.");
+    ZH_ERROR_CHECK(config != NULL, ESP_ERR_INVALID_ARG, NULL, "Initial config is NULL.");
     ZH_ERROR_CHECK((config->i2c_address >= 0x20 && config->i2c_address <= 0x27) || (config->i2c_address >= 0x38 && config->i2c_address <= 0x3F), ESP_ERR_INVALID_ARG, NULL, "Invalid I2C address.");
     ZH_ERROR_CHECK(config->task_priority >= 10 && config->stack_size >= 2048, ESP_ERR_INVALID_ARG, NULL, "Invalid task settings.");
-    ZH_ERROR_CHECK(config->interrupt_gpio >= 0 && config->interrupt_gpio <= GPIO_NUM_MAX, ESP_ERR_INVALID_ARG, NULL, "Invalid GPIO number.");
+    ZH_ERROR_CHECK(config->interrupt_gpio >= GPIO_NUM_0 && config->interrupt_gpio <= GPIO_NUM_MAX, ESP_ERR_INVALID_ARG, NULL, "Invalid GPIO number.");
 #ifndef CONFIG_IDF_TARGET_ESP8266
     ZH_ERROR_CHECK(config->i2c_handle != NULL, ESP_ERR_INVALID_ARG, NULL, "Invalid I2C handle.");
 #endif
     return ESP_OK;
 }
 
-static esp_err_t _zh_pcf8574_configure_i2c_device(const zh_pcf8574_init_config_t *config, zh_pcf8574_handle_t *handle)
+static esp_err_t _zh_pcf8574_gpio_init(const zh_pcf8574_init_config_t *config, zh_pcf8574_handle_t *handle)
+{
+    if (_interrupt_gpio != GPIO_NUM_MAX)
+    {
+        esp_err_t err = zh_vector_push_back(&_vector, handle);
+        ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "Failed add item to vector.")
+        return ESP_OK;
+    }
+    esp_err_t err = zh_vector_init(&_vector, sizeof(zh_pcf8574_handle_t));
+    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "Failed create vector.")
+    err = zh_vector_push_back(&_vector, handle);
+    ZH_ERROR_CHECK(err == ESP_OK, err, zh_vector_free(&_vector), "Failed add item to vector.")
+    gpio_config_t interrupt_gpio_config = {
+        .intr_type = GPIO_INTR_NEGEDGE,
+        .mode = GPIO_MODE_INPUT,
+        .pin_bit_mask = (1ULL << config->interrupt_gpio),
+        .pull_down_en = GPIO_PULLDOWN_DISABLE,
+        .pull_up_en = GPIO_PULLUP_ENABLE,
+    };
+    err = gpio_config(&interrupt_gpio_config);
+    ZH_ERROR_CHECK(err == ESP_OK, err, zh_vector_free(&_vector), "GPIO configuration failed.")
+    err = gpio_install_isr_service(ESP_INTR_FLAG_LOWMED);
+    ZH_ERROR_CHECK(err == ESP_OK, err, gpio_reset_pin(config->interrupt_gpio); zh_vector_free(&_vector), "Failed install isr service.")
+    err = gpio_isr_handler_add(config->interrupt_gpio, _zh_pcf8574_isr_handler, NULL);
+    ZH_ERROR_CHECK(err == ESP_OK, err, gpio_uninstall_isr_service(); gpio_reset_pin(config->interrupt_gpio); zh_vector_free(&_vector), "Failed add isr handler.")
+    _interrupt_gpio = config->interrupt_gpio;
+    return ESP_OK;
+}
+
+static esp_err_t _zh_pcf8574_i2c_init(const zh_pcf8574_init_config_t *config, zh_pcf8574_handle_t *handle)
 {
 #ifndef CONFIG_IDF_TARGET_ESP8266
     i2c_device_config_t pcf8574_config = {
@@ -108,9 +178,9 @@ static esp_err_t _zh_pcf8574_configure_i2c_device(const zh_pcf8574_init_config_t
     };
     i2c_master_dev_handle_t _dev_handle = NULL;
     esp_err_t err = i2c_master_bus_add_device(config->i2c_handle, &pcf8574_config, &_dev_handle);
-    ZH_ERROR_CHECK(err == ESP_OK, err, handle->dev_handle = NULL;, "Failed to add I2C device.");
+    ZH_ERROR_CHECK(err == ESP_OK, err, NULL;, "Failed to add I2C device.");
     err = i2c_master_probe(config->i2c_handle, config->i2c_address, 1000 / portTICK_PERIOD_MS);
-    ZH_ERROR_CHECK(err == ESP_OK, err, i2c_master_bus_rm_device(_dev_handle); handle->dev_handle = NULL, "Expander not connected or not responding.");
+    ZH_ERROR_CHECK(err == ESP_OK, err, i2c_master_bus_rm_device(_dev_handle), "Expander not connected or not responding.");
     handle->i2c_handle = config->i2c_handle;
     handle->dev_handle = _dev_handle;
 #endif
@@ -120,47 +190,20 @@ static esp_err_t _zh_pcf8574_configure_i2c_device(const zh_pcf8574_init_config_t
     handle->gpio_status = handle->gpio_work_mode;
     handle->i2c_address = config->i2c_address;
     handle->i2c_port = config->i2c_port;
-    handle->is_initialized = true;
     return ESP_OK;
 }
 
-static esp_err_t _zh_pcf8574_configure_interrupts(const zh_pcf8574_init_config_t *config, zh_pcf8574_handle_t handle)
+static esp_err_t _zh_pcf8574_resources_init(const zh_pcf8574_init_config_t *config)
 {
-    if (_interrupt_gpio != GPIO_NUM_MAX)
-    {
-        esp_err_t err = zh_vector_push_back(&_vector, &handle);
-        ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "Failed add item to vector.")
-        return ESP_OK;
-    }
-    _interrupt_gpio = config->interrupt_gpio;
-    esp_err_t err = zh_vector_init(&_vector, sizeof(zh_pcf8574_handle_t));
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "Failed create vector.")
-    err = zh_vector_push_back(&_vector, &handle);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "Failed add item to vector.")
-    gpio_config_t isr_pin_config = {
-        .intr_type = GPIO_INTR_NEGEDGE,
-        .mode = GPIO_MODE_INPUT,
-        .pin_bit_mask = (1ULL << _interrupt_gpio),
-        .pull_down_en = GPIO_PULLDOWN_DISABLE,
-        .pull_up_en = GPIO_PULLUP_ENABLE,
-    };
-    err = gpio_config(&isr_pin_config);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "GPIO configuration failed.")
-    err = gpio_install_isr_service(0);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "Failed install isr service.")
-    err = gpio_isr_handler_add(_interrupt_gpio, _zh_pcf8574_isr_handler, NULL);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "Failed add isr handler.")
     _interrupt_semaphore = xSemaphoreCreateBinary();
     ZH_ERROR_CHECK(_interrupt_semaphore != NULL, ESP_ERR_NO_MEM, NULL, "Failed to create semaphore.")
-    BaseType_t x_err = xTaskCreatePinnedToCore(
-        &_zh_pcf8574_isr_processing_task,
-        "_zh_pcf8574_isr_processing_task",
-        config->stack_size,
-        NULL,
-        config->task_priority,
-        NULL,
-        tskNO_AFFINITY);
-    ZH_ERROR_CHECK(x_err == pdPASS, ESP_FAIL, vSemaphoreDelete(_interrupt_semaphore), "Failed to create isr processing task.")
+    return ESP_OK;
+}
+
+static esp_err_t _zh_pcf8574_task_init(const zh_pcf8574_init_config_t *config)
+{
+    BaseType_t err = xTaskCreatePinnedToCore(&_zh_pcf8574_isr_processing_task, "zh_pcf8574_isr_processing_task", config->stack_size, NULL, config->task_priority, NULL, tskNO_AFFINITY);
+    ZH_ERROR_CHECK(err == pdPASS, err, NULL, "Failed to create isr processing task.")
     return ESP_OK;
 }
 
@@ -179,7 +222,6 @@ static void IRAM_ATTR _zh_pcf8574_isr_processing_task(void *pvParameter)
     for (;;)
     {
         xSemaphoreTake(_interrupt_semaphore, portMAX_DELAY);
-        ZH_LOGI("PCF8574 isr processing begin.");
         for (uint16_t i = 0; i < zh_vector_get_size(&_vector); ++i)
         {
             zh_pcf8574_handle_t *handle = zh_vector_get_item(&_vector, i);
@@ -212,23 +254,20 @@ static void IRAM_ATTR _zh_pcf8574_isr_processing_task(void *pvParameter)
             }
             if (event.gpio_number != 0xFF)
             {
-                err = esp_event_post(ZH_PCF8574, 0, &event, sizeof(event), portTICK_PERIOD_MS);
+                err = esp_event_post(ZH_PCF8574, 0, &event, sizeof(event), 1000 / portTICK_PERIOD_MS);
                 if (err != ESP_OK)
                 {
                     ZH_LOGE("PCF8574 isr processing failed. Failed to post interrupt event.", err);
+                    continue;
                 }
             }
         }
-        ZH_LOGI("PCF8574 isr processing completed successfully.");
     }
     vTaskDelete(NULL);
 }
 
 static esp_err_t _zh_pcf8574_read_register(zh_pcf8574_handle_t *handle, uint8_t *reg)
 {
-    ZH_LOGI("PCF8574 read started.");
-    ZH_ERROR_CHECK(handle != NULL || reg != NULL, ESP_ERR_INVALID_ARG, NULL, "PCF8574 read failed. Invalid argument.");
-    ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_NOT_FOUND, NULL, "PCF8574 read failed. PCF8574 not initialized.");
 #ifdef CONFIG_IDF_TARGET_ESP8266
     i2c_cmd_handle_t i2c_cmd_handle = i2c_cmd_link_create();
     i2c_master_start(i2c_cmd_handle);
@@ -240,17 +279,13 @@ static esp_err_t _zh_pcf8574_read_register(zh_pcf8574_handle_t *handle, uint8_t
 #else
     esp_err_t err = i2c_master_receive(handle->dev_handle, &handle->gpio_status, sizeof(handle->gpio_status), 1000 / portTICK_PERIOD_MS);
 #endif
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 read failed. I2C driver error.");
+    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "I2C driver error.");
     *reg = handle->gpio_status;
-    ZH_LOGI("PCF8574 read completed successfully.");
     return ESP_OK;
 }
 
 static esp_err_t _zh_pcf8574_write_register(zh_pcf8574_handle_t *handle, uint8_t reg)
 {
-    ZH_LOGI("PCF8574 write started.");
-    ZH_ERROR_CHECK(handle != NULL, ESP_ERR_INVALID_ARG, NULL, "PCF8574 write failed. Invalid argument.");
-    ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_NOT_FOUND, NULL, "PCF8574 write failed. PCF8574 not initialized.");
 #ifdef CONFIG_IDF_TARGET_ESP8266
     i2c_cmd_handle_t i2c_cmd_handle = i2c_cmd_link_create();
     i2c_master_start(i2c_cmd_handle);
@@ -262,8 +297,7 @@ static esp_err_t _zh_pcf8574_write_register(zh_pcf8574_handle_t *handle, uint8_t
 #else
     esp_err_t err = i2c_master_transmit(handle->dev_handle, &reg, sizeof(reg), 1000 / portTICK_PERIOD_MS);
 #endif
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 write failed. I2C driver error.");
+    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "I2C driver error.");
     handle->gpio_status = reg;
-    ZH_LOGI("PCF8574 write completed successfully.");
     return ESP_OK;
 }
\ No newline at end of file