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Debug UART

The debug UART carries the serial console of Core 3588E. It is UART2 of the module, on pins 236 and 238 of the edge connector, and the carrier board brings it to a header. On the Leetop A206, it is on the button header.

Specifications​

ItemValue
ConnectorButton header, 1 x 12 pins, 2.54 mm pitch
SignalsUART RXD on pin 3, UART TXD on pin 4, GND on pin 7
Signal level3.3 V
Module signalUART2, edge connector pins 236 (TXD) and 238 (RXD)
Settings1500000 baud, 8N1, no flow control, as used by the bootloader and Mixtile OS

Connection​

Connect a 3.3 V USB to TTL converter as follows.

ConverterButton header
GNDGND, pin 7
TXDUART RXD, pin 3
RXDUART TXD, pin 4

Wiring between a USB to TTL converter and the button header of the Leetop A206: converter TXD to RXD pin 3, RXD to TXD pin 4, GND to GND pin 7

Figure 1. Converter wiring

For the complete serial-console procedure, see Connect to Core 3588E.