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FAQ

Q: What should I do if the Arduino example program does not display after downloading?
  • Check the Arduino parameter settings.
Q: After downloading a program to the module, sometimes it fails to connect to the serial port or fails to flash during subsequent downloads?
  • Press and hold the Reset button for more than 1 second, wait for the PC to re-recognize the device, then download again
  • Press and hold the BOOT button, press RESET, release RESET, then release BOOT. The module will enter download mode, which solves most download issues.
  • Press and hold the BOOT button, reconnect the USB cable, and after the USB cable is connected, release the BOOT button. The module will enter download mode, which solves most download issues.
Q: The module keeps resetting, and when checking in Device Manager, the connection appears to be blinking?
  • This may be caused by a blank Flash that makes the USB port unstable. Press and hold the BOOT button, press RESET, release RESET, then release the BOOT button. The module will enter download mode, allowing you to flash the firmware (program) and resolve the issue.
Q: What should I do if the first compilation is extremely slow?
  • The first compilation being slow is normal; just wait patiently
Q: After successful flashing in ESP‑IDF, the serial port shows 'waiting for download...'. What should I do?
  • If the development board has a reset button, press it; if not, power cycle the board.
Q: How to handle the situation when the AppData folder cannot be found?
  • Some AppData folders are hidden by default. You can set your system to show them.
  • File Explorer -> View -> Check "Hidden items"
Q: How to check which COM port I am using?

  • Windows System:

    • ①Check via Device Manager: Press Windows + R to open the "Run" dialog box. Type devmgmt.msc and press Enter to open Device Manager. Expand the "Ports (COM & LPT)" section. All COM ports and their current status will be listed here.
    • ②Check using Command Prompt: Open the Command Prompt (CMD), type the mode command, which will display status information for all COM ports.
    • ③Check Hardware Connection: If an external device is already connected to a COM port, the device typically occupies a port number. You can determine which port is being used by checking the connected hardware.

  • Linux System:

    • ①Check using the dmesg command: Open the terminal.
    • ②Check using the ls command: Type ls /dev/ttyS* or ls /dev/ttyUSB* to list all serial devices.
    • ③Check using the setserial command: Type setserial -g /dev/ttyS* to view configuration information for all serial devices.
When using a MAC device, program upload fails?
Q: How to use SquareLine Studio to design interfaces?