ESP32-S3 comes with a number of GPIO limitations.
- Do not use GPIO26, GPIO27, GPIO28, GPIO29, GPIO30, GPIO31, GPIO32. These pins are connected to “in-package flash/PSRAM and NOT recommended for other uses”. Configuring any of these pins for input or output typically crashes the firmware.
- Do not use GPIO33, GPIO34, GPIO35, GPIO36, GPIO37 when your ESP32-S3 or ESP-S3MINI module contains octal (8-bit data bus) in-package flash/PSRAM.
- GPIO0 and GPIO46 are boot strapping pins. Boot strapping pins should be pulled up/down externally to control the boot mode.
- GPIO45 is a strapping pin for VDD_SPI voltage
- GPIO46 straps pin for ROM message printing
- GPIO3 straps the JTAG signal source.
Please refer to the ESP32-S3 for details.
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