ESP32 + AC Dimmer: Guru Meditation Error and IRAM_ATTR — Causes and Fix 26 февр. 2026 г. 0 2 TL;DR: If your ESP32 with an AC dimmer crashes ("Guru Meditation Error" or "Cache disabled but cached memory region accessed"), the cause is that the zero-cross ISR handler is not marked with IRAM_ATT... ESP32 IRAM_ATTR WiFi ac-dimmer troubleshooting Читать далее