FAQ

Q: After powering on the module, the recognized serial port devices and USB port keep resetting/rebooting?

A: Check if the supply voltage of the USB port is less than 5V. Generally, if the USB port's supply voltage is above 4.9V, both USB ports on the module should function normally. If it is below 4.9V, insufficient power supply may occur, leading to the USB port disconnecting. In this case, you need to switch to a USB port that provides adequate voltage.

Q: After downloading a program to the module, sometimes it fails to connect to the serial port or fails to flash during subsequent downloads?

A: You can press and hold the BOOT button, then press the RESET button while holding BOOT, release the RESET button, and finally release the BOOT button. This will put the module into download mode, which resolves most download-related issues.

Q: Which onboard GPIOs are occupied?

A: GPIO6 and GPIO15.