Xiao-esp32c6 uarts

[grobasoz]

@EEJim

Is the low power UART accessible on the XIAO-ESP32C6 module?

Yes, it is - I use it for handling low power wake up by an external device for sending data to my Zigbee network by the 'C6.

@PJ_Glasso

3. LP-UART (Low-Power UART / UART2)

• Exists on the chip (for deep sleep wake and light tasks)
• Not exposed by the Arduino BSP by default
• Might be used internally (like JTAG or boot/debug), but not available out-of-the-box on the Xiao board
• You’d need ESP-IDF and GPIO re-mapping to access it — not typically accessible via Arduino or in common use

Not true (except for 1).

@PJ_Glasso

Is the low power UART accessible on the XIAO-ESP32C6 module?

Not directly via Arduino. You’d need ESP-IDF and to re-map it manually. It’s not exposed on any Xiao pin by default and is not used in Arduino sketches unless you go low-level.

Not true either.

#ifdef USE_UART2  // Any GPIO MUX
#define RX_PIN 4 // Default LP_RX0,  GPIO_NUM_4
#define TX_PIN 5 // Default LP_TX0,  GPIO_NUM_5

HardwareSerial MySerial2(2);
#endif  // USE_UART2