UART Passthrough
One wire is all you need to debug an external module
Turns the onboard UART into a general-purpose serial console: send and receive text or hex, transmit per line or per packet, show byte counts and timestamps live, and run a loopback self-test to confirm the hardware link.
When debugging WiFi modules, GPS, fingerprint readers or sensor UART protocols, logs go straight to the screen instead of requiring another computer.
On-screen interface
A recreation of this page on the 2.41-inch AMOLED display (600 Γ 450). Actual interaction and layout follow the latest firmware.
Key capabilities
UART terminal
Text / hex modes, send per line or per packet.
Loopback self-test
Verify wiring and baud rate with one tap.
Timestamped log
Recorded with timestamps and reviewable.
Configurable parameters
Baud rate, data bits, parity and stop bits adjustable.
Technical specs
Typical scenarios
Module bring-up
Send AT commands to a module and see replies on the screen.
Protocol integration
Compare frame headers and checksums byte by byte in hex mode.
Related commands
page 19 Jump to UART passthrough uart test Run the loopback self-test uart feed <HEX> Inject a hex packet
- This UART is dedicated to peripherals and is not the same channel as the USB debug console.