FAQ

Q: When re-downloading the program, why does the serial port fail to connect or flashing fail?

Press and hold the BOOT button, and press the RESET button at the same time; release RESET first, then release BOOT. After the development board enters download mode, select the serial port again and flash the program.

Q: Which GPIOs on the development board cannot be used as general-purpose pins?

GPIO33 through GPIO37 are occupied by internal functions of the development board and cannot be used as general-purpose GPIOs.

Q: Does the development board support accessing the TF card via SDIO?

Yes, but only 1-line SD mode is supported. The corresponding pins need to be configured in menuconfig.

Q: How do I switch to an IPEX Gen 1 external antenna?

The development board uses a ceramic antenna by default, and the corresponding 0 Ω resistor is soldered vertically. When using an IPEX external antenna, this 0 Ω resistor must be resoldered to a horizontal position.

Q: Where can I find Espressif's official FAQ?

See Espressif ESP-FAQ.