There are no such serial control lines at allĭepending on the kind of hardware you have, it may also be possible to manually put your ESP32 board into Firmware Download mode (reset).įor development boards produced by Espressif, this information can be found in the respective getting started guides or user guides.

The DTR and RTS lines are configured differently Your hardware does not have the DTR and RTS lines connected to GPIO0 and CHIP_PU However, esptool.py is not able to reset your hardware automatically in the following cases: In general, you should have no problems with the official esp-idf development boards. As an example, check the schematic for the ESP32 DevKitC development board. The DTR and RTS control lines are in turn connected to GPIO0 and CHIP_PU (EN) pins of ESP32, thus changes in the voltage levels of DTR and RTS will boot ESP32 into Firmware Download mode. One simple solution to try is manual reset described below, and if it does not help you can find more details about possible issues in Troubleshooting.Įsptool.py resets ESP32 automatically by asserting DTR and RTS control lines of the USB to serial converter chip, i.e., FTDI or CP210x (for more information, see Establish Serial Connection with ESP32). One of the reasons might be issues encountered by esptool.py, the utility that is called by the build system to reset the chip, interact with the ROM bootloader, and flash firmware. If you run the given command and see errors such as “Failed to connect”, there might be several reasons for this.

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