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Forum Flashing ESP32 by only UART port

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Flashing ESP32 by only UART port

Chuitoto over 2 years ago

Hi element 14! have anyone know can we program ESP32 with only UART connection without a USB-to-UART bridge?

Let's say I have a Jetson nano whtch can have GPIO on the board, UART connunication can be used through 4pin (+, -, RX, TX)

Can we flash the ESP32 by ESP-IDF only by those pin without a USB-to-UART bridge?

embeddedguy over 2 years ago

Yes, one can do that. You need to a USB to TTL converter to do that. And when flashing using $idf.py flash press the boot button which is motly connected to GPIO1 of ESP and makes esp into firmware download mode.
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JWx over 2 years ago

according to this:

https://forums.developer.nvidia.com/t/serial-ports-uart-on-the-jetson-tx2-and-nano/117687

Jetson serial ports are named /dev/ttyS0-3 (or ttyTHS0-3) in linux

USB-to-Serial port is detected in Linux as any standard serial port (maybe with specific name, but device names like ttyS0 are also possible)

if voltage levels are compatible one can verify what serial port is used in ESP-IDF util, change it to the above (/dev/ttySx or /dev/ttyTHSx) and flash it like embeddedguy mentioned (reset into download mode then flash)
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Chuitoto over 2 years ago in reply to JWx

O greate! It's Possible to use ttySX port to flash ESP32! thank you for all your reply!
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