diff --git a/zh_160x_i2c.c b/zh_160x_i2c.c
index d6edb15..4164322 100644
--- a/zh_160x_i2c.c
+++ b/zh_160x_i2c.c
@@ -26,8 +26,7 @@ esp_err_t zh_160x_init(zh_pcf8574_handle_t *handle, bool size) // -V2008
     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;
-    esp_err_t err = _zh_160x_lcd_init(handle);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "160X initialization failed. PCF8574 error.");
+    ZH_ERROR_CHECK(_zh_160x_lcd_init(handle) == ESP_OK, ESP_FAIL, NULL, "160X initialization failed. PCF8574 error.");
     ZH_LOGI("160X initialization completed successfully.");
     return ESP_OK;
 }
@@ -37,8 +36,7 @@ esp_err_t zh_160x_lcd_clear(zh_pcf8574_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.");
-    esp_err_t err = _zh_160x_send_command(handle, 0x01);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "160X display cleaning failed. PCF8574 error.");
+    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;
 }
@@ -48,10 +46,10 @@ esp_err_t zh_160x_set_cursor(zh_pcf8574_handle_t *handle, uint8_t row, uint8_t c
     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.");
-    esp_err_t err = _zh_160x_send_command(handle, 0x80 | ((row == 0) ? col : (row == 1) ? (0x40 + col)
-                                                                         : (row == 2)   ? (0x10 + col)
-                                                                                        : (0x50 + col)));
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "160X set cursor failed. PCF8574 error.");
+    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_LOGI("160X set cursor completed successfully.");
     return ESP_OK;
 }
@@ -63,8 +61,7 @@ esp_err_t zh_160x_print_char(zh_pcf8574_handle_t *handle, const char *str)
     ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_INVALID_STATE, NULL, "160X print char failed. PCF8574 not initialized.");
     while (*str != 0)
     {
-        esp_err_t err = _zh_160x_send_data(handle, (uint8_t)*str++);
-        ZH_ERROR_CHECK(err == ESP_OK, err, 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;
@@ -77,8 +74,7 @@ esp_err_t zh_160x_print_int(zh_pcf8574_handle_t *handle, int num)
     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);
-    esp_err_t err = zh_160x_print_char(handle, buffer);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "160X print int failed. PCF8574 error.");
+    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;
 }
@@ -90,8 +86,7 @@ esp_err_t zh_160x_print_float(zh_pcf8574_handle_t *handle, float num, uint8_t pr
     ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_INVALID_STATE, NULL, "160X print float failed. PCF8574 not initialized.");
     char buffer[16];
     sprintf(buffer, "%.*f", precision, num);
-    esp_err_t err = zh_160x_print_char(handle, buffer);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "160X print float failed. PCF8574 error.");
+    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;
 }
@@ -102,19 +97,16 @@ esp_err_t zh_160x_print_progress_bar(zh_pcf8574_handle_t *handle, uint8_t row, u
     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.");
     uint8_t blocks = (progress * 16) / 100;
-    esp_err_t err = zh_160x_set_cursor(handle, row, 0);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "160X print progress bar failed. PCF8574 error.");
+    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)
     {
         if (i < blocks)
         {
-            err = zh_160x_print_char(handle, "\xFF");
-            ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "160X print progress bar failed. PCF8574 error.");
+            ZH_ERROR_CHECK(zh_160x_print_char(handle, "\xFF") == ESP_OK, ESP_FAIL, NULL, "160X print progress bar failed. PCF8574 error.");
         }
         else
         {
-            err = zh_160x_print_char(handle, " ");
-            ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "160X print progress bar failed. PCF8574 error.");
+            ZH_ERROR_CHECK(zh_160x_print_char(handle, " ") == ESP_OK, ESP_FAIL, NULL, "160X print progress bar failed. PCF8574 error.");
         }
     }
     ZH_LOGI("160X print progress bar completed successfully.");
@@ -126,15 +118,12 @@ esp_err_t zh_160x_clear_row(zh_pcf8574_handle_t *handle, uint8_t row) // -V2008
     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.");
-    esp_err_t err = zh_160x_set_cursor(handle, row, 0);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "160X clear row failed. PCF8574 error.");
+    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)
     {
-        err = zh_160x_print_char(handle, " ");
-        ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "160X clear row failed. PCF8574 error.");
+        ZH_ERROR_CHECK(zh_160x_print_char(handle, " ") == ESP_OK, ESP_FAIL, NULL, "160X clear row failed. PCF8574 error.");
     }
-    err = zh_160x_set_cursor(handle, row, 0);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "160X clear row failed. PCF8574 error.");
+    ZH_ERROR_CHECK(zh_160x_set_cursor(handle, row, 0) == ESP_OK, ESP_FAIL, NULL, "160X clear row failed. PCF8574 error.");
     ZH_LOGI("160X clear row completed successfully.");
     return ESP_OK;
 }
@@ -144,8 +133,7 @@ esp_err_t zh_160x_on_cursor(zh_pcf8574_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.");
-    esp_err_t err = _zh_160x_send_command(handle, (blink == true) ? 0x0f : 0x0e);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "160X enable cursor failed. PCF8574 error.");
+    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;
 }
@@ -155,8 +143,7 @@ esp_err_t zh_160x_off_cursor(zh_pcf8574_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.");
-    esp_err_t err = _zh_160x_send_command(handle, 0x0c);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "160X disable cursor failed. PCF8574 error.");
+    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;
 }
@@ -164,70 +151,46 @@ esp_err_t zh_160x_off_cursor(zh_pcf8574_handle_t *handle)
 static esp_err_t _zh_160x_lcd_init(zh_pcf8574_handle_t *handle) // -V2008
 {
     vTaskDelay(20 / portTICK_PERIOD_MS);
-    esp_err_t err = zh_pcf8574_write(handle, 0x30);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = _zh_160x_pulse(handle);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = zh_pcf8574_write(handle, 0x30);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = _zh_160x_pulse(handle);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = zh_pcf8574_write(handle, 0x30);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = _zh_160x_pulse(handle);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = zh_pcf8574_write(handle, 0x20);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = _zh_160x_pulse(handle);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = _zh_160x_send_command(handle, 0x28);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = _zh_160x_send_command(handle, 0x28);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = _zh_160x_send_command(handle, 0x28);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = _zh_160x_send_command(handle, 0x0C);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = _zh_160x_send_command(handle, 0x01);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = _zh_160x_send_command(handle, 0x06);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
+    ZH_ERROR_CHECK(zh_pcf8574_write(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_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_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_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)
 {
-    esp_err_t err = zh_pcf8574_write(handle, (command & 0xF0) | 0x08);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = _zh_160x_pulse(handle);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = zh_pcf8574_write(handle, (command << 4) | 0x08);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = _zh_160x_pulse(handle);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
+    ZH_ERROR_CHECK(zh_pcf8574_write(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_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)
 {
-    esp_err_t err = zh_pcf8574_write(handle, (data & 0xF0) | 0x09);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = _zh_160x_pulse(handle);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = zh_pcf8574_write(handle, (data << 4) | 0x09);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
-    err = _zh_160x_pulse(handle);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
+    ZH_ERROR_CHECK(zh_pcf8574_write(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_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)
 {
-    esp_err_t err = zh_pcf8574_write_gpio(handle, ZH_PCF8574_GPIO_NUM_P2, ZH_PCF8574_GPIO_HIGH);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
+    ZH_ERROR_CHECK(zh_pcf8574_write_gpio(handle, ZH_PCF8574_GPIO_NUM_P2, ZH_PCF8574_GPIO_HIGH) == ESP_OK, ESP_FAIL, NULL, "PCF8574 error.");
     vTaskDelay(1 / portTICK_PERIOD_MS);
-    err = zh_pcf8574_write_gpio(handle, ZH_PCF8574_GPIO_NUM_P2, ZH_PCF8574_GPIO_LOW);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 error.");
+    ZH_ERROR_CHECK(zh_pcf8574_write_gpio(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;
 }