Fix Wi-Fi failing to connect on non PSRAM hardware with SPIRAM configuration

[alberk8]

Description

WIFI will not connect when using firmware with PSRAM option on non PSRAM hardware. For example using ESP32_PSRAM_REV3 firmware on ESP32 WROOM hardware.

Motivation and Context

Reported the issue espressif/esp-idf#11971 in ESP IDF and the same issue also happens in micropython. The issue arise due to the way ESP-IDF allocates cache memory for WIFI when PSRAM/SPIRAM option is enabled. On runtime WIFI cache will still be allocated when PSRAM is unavailable and this causes OOM.

This fix will check for PSRAM availability at runtime and disable the WIFI cache thus allowing for WIFI to connect.

How Has This Been Tested?

Tested on ESP32 REV0, REV3 (with and without PSRAM), ESP32 S3

Screenshots

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue with code or algorithm)
• New feature (non-breaking change which adds functionality to code)
• Breaking change (fix or feature that would cause existing functionality to change)
• Config and build (change in the configuration and build system, has no impact on code or features)
• Dev Containers (changes related with Dev Containers, has no impact on code or features)
• Dependencies (update dependencies and changes associated, has no impact on code or features)
• Documentation (changes or updates in the documentation, has no impact on code or features)

Checklist

• My code follows the code style of this project (only if there are changes in source code).
• My changes require an update to the documentation (there are changes that require the docs website to be updated).
• I have updated the documentation accordingly (the changes require an update on the docs in this repo).
• I have read the CONTRIBUTING document.
• I have tested everything locally and all new and existing tests passed (only if there are changes in source code).

[josesimoes]

Nice finding! Thank you for providing a fix. 👍🏻 🥇