uart via built in usb on esp board

[fly135]

I cannot get it working. Tried all 3 uarts 0-2 with UART_PIN_NO_CHANGE
Also noticed according to pinout of devkit board uart0 txd is 41 but undefined
I will try wifi then

This is something I've found confusing. From what I can tell "pin #s" are the GPIO number, not the physical pin on the chip.

Maybe someone will correct me if I'm wrong.

John A

[Deouss]

This is something I've found confusing. From what I can tell "pin #s" are the GPIO number, not the physical pin on the chip.

Maybe someone will correct me if I'm wrong.

John A

I think it is the case on Arduino Atmel boards.
On Esp and Stm I found pin numbers to be same as their names so far

[ESP_Angus]

That's right, whenever software asks for a pin number it is asking for the GPIO number not the number of the pin/pad on the QFN package.

So, for example, the default UART 0 TXD pin is GPIO 1. You can find it at pad 41 on the ESP32-D0 QFN package (a different pad on the ESP32-D2, but it's still GPIO 1).

[Deouss]

So it is still a mistery how to intercept simple printf() calls from esp32 by f.ex. Windows app listening to a serial port...
Anyone has ideas?

[kirill_yatsenko]

Hi,

I have a similar question on trying to communicate with PC via UART ports.
I'm expecting to see logs in the serial terminal.
I've connected a USB cable to the dev board and also the FTDI UART-USB converter.

When printing the ports:
1. /dev/ttyUSB0
2. /dev/ttyUSB1

When connecting to serial communication via putty to USB0 I can see logs from the ESP
But when trying to connect to /dev/ttyUSB1 port I don't see any output

Source: https://github.com/KirillYatsenko/temp-uart-echo

Pins:
1. TXD_PIN 18
2. RXD_PIN 19

I'm expecting to see logs with the received message from the putty terminal