HeltecTM STM32+LoRa Series Frequently Asked Questions

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This page contains the most frequently questions from user. If this page’s detail can’t solve your problem, you can also talk in our forum: community.heltec.cn

 

Can’t Download Firmware

  • Use USB cable.

    • Use a better USB cable, or change a USB socket.
    • Enter the DFU mode correctly.
  • Use ST-LINK.

    • Make sure that the development board is connected to ST-LINK correctly.

    • About the solution to the failure to download firmware using ST-LINK(This method is mainly for Node 151, ):

      The first step of normal use -> Then press the RST KEY before proceeding to the second step -> The second step, then release the RST KEY.

      ../_images/0150.png

​ The reason for this situation is: For the ultimate low power consumption, we have disabled most of the pins that are not normally used.

Please refer to the following documents:

 

Serial port has no output

  • Use USB-CDC(USB-Virtual Serial Port)
    • USB-CDC is not configured correctly(You can refer to our examples).
  • Use USB-UART
    • Make sure that the development board is connected to USB-UART module correctly.

Please refer to the following documents: