docs: add error codes reference

docs/en/api-reference/error-codes.rst

@@ -0,0 +1,8 @@
+Error Codes Reference
+=====================
+
+This section lists various error code constants defined in ESP-IDF.
+
+For general information about error codes in ESP-IDF, see :doc:`Error Handling <../api-guides/error-handling>`.
+
+.. include:: /_build/inc/esp_err_defs.inc

docs/en/api-reference/index.rst

@@ -14,4 +14,5 @@ API Reference
    Storage <storage/index>
    System <system/index>
    Configuration Options <kconfig>
+   Error Codes Reference <error-codes>
 

docs/en/api-reference/system/esp_err.rst

@@ -0,0 +1,14 @@
+Error Codes and Helper Functions
+================================
+
+This section lists definitions of common ESP-IDF error codes and several helper functions related to error handling.
+
+For general information about error codes in ESP-IDF, see :doc:`Error Handling <../../api-guides/error-handling>`.
+
+For the full list of error codes defined in ESP-IDF, see :doc:`Error Code Reference <../error-codes>`.
+
+API Reference
+-------------
+
+.. include:: /_build/inc/esp_err.inc
+

docs/en/api-reference/system/index.rst

@@ -19,6 +19,7 @@ System API
    Base MAC address <base_mac_address>
    Over The Air Updates (OTA) <ota>
    ESP pthread <esp_pthread>
+   Error Codes and Helper Functions <esp_err>
 
 
 Example code for this API section is provided in :example:`system` directory of ESP-IDF examples.