The drivers above are primarily for reference. Please check the board user guide for specific USB-to-UART bridge chip used. If device driver does not install automatically, identify USB-to-UART bridge on your ESP32 board (or external converter dongle), search for drivers in internet and install them.īelow is the list of USB to serial converter chips installed on most of the ESP32 boards produced by Espressif together with links to the drivers:ĬP210x: CP210x USB to UART Bridge VCP Drivers Connect ESP32 to PC Ĭonnect the ESP32 board to the PC using the USB cable. This section provides guidance on how to establish a serial connection between ESP32 and PC using USB-to-UART Bridge, either installed on the development board or external. You might have some kind of race going on as to who gets to the com port first.External USB-to-UART Bridge  Flash using UART  So it does not complain if the port is already taken by another program. Not sure what Intel RST needs a com port for, I am guessing it's just a debug output. Now that I think about it I recall having an issue with Intel RST software using a com port on one of my machines. Mainly Dell system managers, update checkers, and service programs that inventory your system can cause this because they access all of the ports when they take inventory. My company buys Dell and even 'corporate' Dell's come with all kinds of bloatware preinstalled. Make sure there is no Dell software of any kind running.

I believe even LabVIEW can cause MAX to display this if you are not closing your VISA sessions properly. This is usually indicative of something else (another program) having control of the Com port. When I run NI-Max 18.5 to check/configure the port it says it exists but it can't access it. Occasionally at startup it can't find/access the COM1 port.

Windows 10 serial console