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docs(uart): clarify example pins need a USB-to-UART bridge

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Mo Fei Fei
2026-09-10 14:50:43 +08:00
committed by morris
parent 2dc25a7bbe
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examples/peripherals/uart/uart_echo/README.md
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@@ -12,8 +12,9 @@ configured UART.
### Hardware Required
The example can be run on any development board, that is based on the Espressif SoC. The board shall be connected to a computer with a single USB cable for flashing and monitoring. The external interface should have 3.3V outputs. You may
use e.g. 3.3V compatible USB-to-Serial dongle.
The example can be run on any development board, that is based on the Espressif SoC. The board shall be connected to a computer with a single USB cable for flashing and monitoring.
This example echoes on a separate UART (default GPIO4/GPIO5), not on the port used for flashing and monitoring. Use an external 3.3 V compatible USB-to-Serial dongle: connect one end to the PC and the other end to the specific UART pins.
### Setup the Hardware